135 results about "Cadmium ion" patented technology

The invention belongs to the technical field of fluorescent active substance development, and particularly relates to a cadmium (II)-based metal organic framework crystalline material as well as a preparation method and application thereof. The molecular formula of the cadmium (II)-based metal organic framework crystalline material is {[Cd3 (Br-BDC) 3 (BMIP) 2]. 2H2O} n, cadmium (II) ions serve as connecting nodes, BMIP and H2 (Br-BDC) ligands serve as bridging ligands to be in mutual bridging to form a three-dimensional space structure, Cd-O secondary structural units are contained in the structure, three Cd atoms form a trinuclear Cd-O cluster structure through the Cd-O secondary structural units, and the Cd (II)-based metal organic framework crystalline material has the structural formula shown in the description. The Cd1 atom and the Cd1 # atom are in mirror symmetry. The divalent cadmium ion fluorescence sensing material can be prepared by adopting a one-pot solvothermal reaction; the preparation method has the advantages of simple process, convenience in operation, high yield, good reproducibility and the like; the cadmium (II) fluorescent sensing material disclosed by the invention is relatively high in fluorescence emission spectrum intensity and can be applied to the fields of molecular fluorescent probes, metal ion detection and the like.

The invention relates to the technical field of wastewater treatment, and discloses a preparation process of a flocculant applied to wastewater treatment.The preparation process comprises the steps that divinyl-containing diphenylethylene triazolyl amide butyric acid, acrylamide and starch are subjected to a cross-linking polymerization reaction, and an acrylamide-starch-based flocculant with a cross-linked network structure is obtained; the cross-linked network structure improves the specific surface area of the flocculant, increases adsorption sites, and improves the adsorption performance of metal ions such as cadmium. The acrylamide-starch-based flocculant contains functional groups such as triazole, carboxyl and Schiff base, nitrogen atoms in the triazole and the Schiff base contain lone pair electrons and can be coordinated and chelated with cadmium ions, and the carboxyl also has a very strong adsorption effect, so that the adsorption capacity and the adsorption rate of the flocculant to the cadmium ions are remarkably improved.

The invention discloses a magnetic iron mineral and phosphate tailing material and application thereof in treatment of arsenic and cadmium pollution. A low-cost phosphate tailing material is taken as an object, and an environmental functional material loaded with magnetic gamma-Fe2O3 and other iron minerals is prepared by adopting a method of'rapid thermal activation-primary addition of a modifying agent-mineral phase conversion '. The magnetic iron mineral and phosphate tailing material can efficiently adsorb cadmium ions, arsenate ions and arsenite ions, has a synchronous adsorption effect on coexisting cadmium ions and inorganic arsenic, and can be used as an efficient passivation repair material for arsenic-cadmium combined polluted soil. The material also has magnetism, is easy to separate and recover, and also can be combined with a magnetic separation technology to serve as a material for synchronously removing arsenic and cadmium pollutants in a water body or soil.

The invention discloses a fluorescent / colorimetric dual-mode paper-based sensor for detecting cadmium ions in rhizoma polygonati as well as a preparation method and application of the fluorescent / colorimetric dual-mode paper-based sensor, and belongs to the technical field of detection of heavy metal residues in food with homology of medicine and food. PEI-UCNPs and PtNPs are loaded on a paper base and are mixed and reacted with Apt-AMNPs (at) TMB, H2O2, a PBS buffer solution and a solution containing Cd < 2 + >. The Aptamer specifically recognizes and captures Cd < 2 + >, so that the Apt-AMNPs (at) TMB is dissociated, and the TMB is released from holes of the AMNPs; the PtNPs on the paper base catalyzes colorless TMB (Tetramethylbenzidine) to generate blue oxide (oxTMB) under the action of H2O2, and the oxTMB can quench up-conversion fluorescence of PEI-UCNPs through fluorescence inner filtration. When the fluorescence / colorimetric dual-mode paper-based sensor is used for detecting the content of cadmium ions in rhizoma polygonati, the fluorescence / colorimetric dual-mode paper-based sensor has the characteristics of simplicity and convenience in operation, low detection cost, rapidness, specificity, sensitivity, portability and the like, and the fluorescence / colorimetric dual-mode paper-based sensor can be applied to on-site detection of the cadmium ions in rhizoma polygonati.

The invention discloses a cadmium ion and lead ion detection system and method based on CRISPR and deoxyribozyme, and the method comprises the following steps: forming active deoxyribozyme by using target ions and a recognition probe, cutting a redundant sequence in a substrate probe, releasing a semi-activator, and cooperatively activating the activity of CRISPR-Cas12a with the other semi-activator in the system. According to the system, the signal-to-noise ratio and the sensitivity of detection are improved by utilizing the effect of inhibiting cooperative activation by redundant fragments in semi-activators. According to the detection method, nano material modification on the substrate probe is not needed, magnetic separation is not needed, and the detection cost is reduced. The detection process only needs two steps of room temperature incubation reaction, and the two steps are carried out in one reaction tube, so that cross contamination possibly caused by multi-tube reaction is avoided, and the detection process is simplified. The method can be applied to detection of cadmium ions and lead ions in rice or serum samples, and has wide application prospects in the fields of food safety, medical detection and the like.

The present invention relates to the technical field of soil regeneration, and specifically to a method for degrading cadmium-contaminated soil based on a heavy metal passivator, comprising the following steps: S1, preparation of PB-MgAl-LDH; S2, magnetic modification of PB-MgAl-LDH; S3, preparation of a passivator; S4, soil remediation. The preferred pine bark and magnesium-aluminum hydrotalcite in a specific growth position of the present invention are prepared by steady-state coprecipitation to obtain a solid powder with good specific surface area and adsorption activity. After magnetic modification, the unique interlayer structure has magnetism, is easy to generate negative charges, accelerates the adsorption of cadmium to balance the charges, and simultaneously undergoes lattice diffusion, isomorphous substitution and other effects, showing a strong ion exchange capacity and adsorption capacity for cadmium ions.

The invention relates to the technical field of semiconductor luminescent materials, in particular to a wide-band-gap semiconductor crystal luminescent material and a preparation method and application thereof. The chemical composition of the CdLCl < 2 >. H2O or the Cd2L2 (Ac) (H2O) is [CdLCl] < 2 >. H2O]. L represents a quinoline carboxylic acid ligand; ac represents an acetate ion; the crystal structure of the wide-band-gap semiconductor crystal luminescent material is a one-dimensional chain structure. The crystal complex is mainly formed by bridging cadmium ions with carboxyl of a quinoline carboxylic ligand, and the formed crystal complex emits light in a red region, is suitable for various light-emitting application scenes, and solves the problems that an existing wide-band-gap semiconductor light-emitting material is relatively low in light-emitting efficiency, light stability and heat stability, and the light-emitting efficiency is low. And the light-emitting wavelength is difficult to regulate and control.

The invention discloses an amorphous tailing-based cadmium-arsenic synchronous adsorption material as well as a preparation method and application thereof. The method comprises the following steps: firstly, uniformly mixing tailings with alkali metal, calcining, washing and drying to obtain amorphous tailings; and then the amorphous tailings and a metal ion solution are mixed, a reducing agent is dropwise added for a reduction reaction, and the amorphous tailing composite material loaded with the nanometer zero-valent metal is obtained. The chain structure of silicate minerals in the tailings can be effectively destroyed through amorphization treatment, a large number of silicon atoms are promoted to be released, the crystal structure of the tailings is disintegrated, a multi-pore-channel structure is formed on the surface, and the specific surface area of the tailings and the adsorption capacity of the tailings to cadmium ions are improved; meanwhile, nano zero-valent metal is introduced to the surface of the amorphous tailings, so that the adsorption performance of the amorphous tailings to arsenic is improved; the finally prepared composite material has efficient adsorption performance and good magnetic recovery characteristic on cadmium and arsenic, and the whole preparation process is simple, convenient and feasible, and can be used for large-scale production.

A kind of water environment cadmium ion and temperature double parameter optical fiber chemical sensing system relates to water body environment detection field.In the above system, spontaneous emission light source is near infrared light source;The surface of optical fiber sensing unit is coated with magnetic MOF-cadmium ion imprinted polymer;The light signal generated by spontaneous emission light source enters optical fiber sensing unit, optical spectrometer collects the transmission spectrum signal of optical fiber sensing unit, and the collected spectrum data are output to photoelectric detection module;Photoelectric detection module converts light signal into electrical signal and transmits to demodulation module;Demodulation module gives the cadmium ion concentration and temperature according to input signal using machine learning algorithm.The present application has higher specific recognition ability to cadmium ion, and can effectively separate the coupling influence of cadmium ion concentration and temperature on sensing signal.

A ZIF-derived zinc-cadmium sulfide photocatalyst, its preparation method, and its application are disclosed. The catalyst, by molar fraction, comprises: 35-50% 2-methylimidazole; 0-7.7% divalent cadmium ion compound; 0-7.7% divalent zinc ion compound; 7-10% thioacetamide; and 35-50% amines. The preparation method involves: preparing a 2-methylimidazole solution and a cadmium-zinc mixed solution separately; then preparing a ZIF precursor solution with cadmium and zinc as the central metals; adding thioacetamide to the precursor solution; transferring the solution to a polytetrafluoroethylene liner and hydrothermally treating it; finally collecting the hydrothermally treated solution, centrifuging, washing, drying, and grinding to obtain the ZIF-derived zinc-cadmium sulfide photocatalyst. The catalyst prepared by this invention has a large specific surface area and exhibits significant catalytic effects in photocatalytic water splitting for hydrogen production. Furthermore, the catalyst has a stable structure and can be recycled for a long period without a significant decrease in the hydrogen production rate.

The invention discloses a method for determining the content of cadmium in edible salt through a coprecipitation atomic absorption graphite furnace method, and belongs to the technical field of trace detection. According to the characteristic that cadmium ions can generate cadmium hydroxide under an alkaline condition, ferric nitrate is used as a coprecipitator, the pH value is adjusted to 9.0 by using ammonia water, the generated cadmium hydroxide and ferric hydroxide are co-precipitated, a supernatant is removed, the precipitate is acidified, an atomic absorption spectrophotometer graphite furnace method is used for determination, and a result shows that the adding standard recovery rate of a sample is 104%; and the relative standard deviation is 2.4%. And the relative standard deviation between the ICP-MS determination result and the determination result of the method is 0.03%, which indicates that the interference of the method is not obvious. According to the method, the interference of sodium chloride in the sample is eliminated, the cadmium element in the sample can be enriched, and the cadmium content in the test sample is increased, so that the detection lower limit of the determination of the cadmium content in the edible salt is reduced, and the determination accuracy and precision are improved.

The application discloses a high-strength steel unqualified zinc-cadmium alloy plating layer stripping method, and its stripping process is as follows: 80-150 g / L of sodium nitrite, 50-100 g / L of ammonium bicarbonate, 50-100 g / L of ammonium chloride, the pH of the stripping solution is 6-8, and normal temperature operation is adopted. The sodium nitrite is used as an oxidizing agent and a steel base inhibitor for the zinc-cadmium alloy plating layer, the ammonium bicarbonate is used as a complexing agent for zinc ions and cadmium ions and a pH buffer for the plating solution, and the ammonium chloride is used as a complexing agent for zinc ions and cadmium ions and a promoter for dissolving the zinc-cadmium alloy plating layer. When the pH of the stripping solution is too high, dilute nitric acid is used to reduce the pH, and when the pH is too low, sodium carbonate solution is used to increase the pH. The technical scheme of the application is used to replace the chromium acid stripping method, and the high pollution problem caused by the use of the chromium acid is overcome.

The invention provides an algae source soil conditioner for synergistically passivating copper and cadmium as well as a preparation method and application of the algae source soil conditioner, and belongs to the technical field of soil remediation. The algae source soil conditioner comprises an algae source active component and a biochar-based carrier. By combining activity retention of the seaweed extract and functional modification of pyrolytic carbon, the content of copper ions and cadmium ions in soil can be remarkably reduced, meanwhile, the activity of soil urease, sucrase and dehydrogenase is promoted to be remarkably improved, and the synergistic effect of heavy metal passivation and soil ecological function restoration is achieved; the preparation method disclosed by the invention is simple and easy to operate, and the prepared algae source soil conditioner has a multi-stage pore structure and rich surface functional groups.

The invention discloses a preparation and use method of a co-reactant-free anti-pollution electrochemical luminescence sensor for detecting cadmium ions in grains, which is characterized in that the oxygen evolution reaction activity of porphyrin, the anti-pollution capability and conductivity of poly (3, 4-ethyldioxythiophene)-polystyrene sulfonate chitosan hydrogel and the luminescence stability of luminol are utilized to detect the cadmium ions in the grains. According to the recognition effect of cadmium ions on aptamers and the signal amplification strategy of a DNA walker, a non-co-reactant anti-pollution electrochemical luminescence sensor for detecting the cadmium ions in the grains in an on-off mode is constructed. The sensor disclosed by the invention can be used for judging whether the detected grain contains target ions or not according to the change of the electrochemical luminescence peak value of the cadmium ions in a detection result. The method has the advantages that the sensor is low in cost, simple in detection operation, free of co-reactants and high in pollution resistance; the cadmium heavy metal can be qualitatively and quantitatively measured; the method has high sensitivity and low detection limit, and provides a thought for detection of other ions and small molecular substances.

The invention provides an aqueous cadmium ion-vanadium dioxide battery as well as a preparation method and application thereof, and relates to the field of ocean energy storage. The battery comprises a negative electrode, a positive electrode, a diaphragm and an aqueous electrolyte, the negative electrode is metal cadmium or cadmium-based alloy; the active material of the positive electrode is metastable monoclinic phase vanadium dioxide; the diaphragm is a glass fiber diaphragm; the aqueous electrolyte is an aqueous solution containing cadmium salt; the total concentration of the cadmium salt in the aqueous electrolyte is 1-4 mol / L. The aqueous vanadium dioxide-cadmium metal secondary battery disclosed by the invention has the advantages of safe aqueous electrolyte system, high rate capability, ultra-long cycle life and the like, and has remarkable advantages when being applied to ocean energy storage.

The invention discloses an electroplating disqualified cadmium layer stripping solution, a preparation method and a use method, and the electroplating disqualified cadmium layer stripping solution comprises 6-8 parts of sodium phytate, 1-3 parts of sodium nitrilotriacetate, 2-4 parts of borate, 5-10 parts of sodium bromate, 1-2 parts of sodium alkyl naphthalene sulfonate, 1-2 parts of glucoside, 5-8 parts of sodium nitrate, 3-5 parts of ammonia water, 2-4 parts of triol ethylamine, 4-6 parts of 1-hydroxyethylidene-1, 1-diphosphonic acid and 8-12 parts of ammonium persulfate. The total amount of the purified water is 100 parts, and the total amount of the purified water is 100 parts. The pH value of the deplating agent solution is alkaline, the problem of hydrogen evolution of a hydrogen sensitive material is solved, the risk of hydrogen embrittlement is avoided, and hydrogen removal is not needed after steel and iron materials are deplated; cadmium ion heavy metal pollution and sewage treatment difficulty exist, the stripped cadmium ions automatically generate precipitates, recycling is facilitated, and the sewage treatment difficulty is reduced; the metal deplating liquid is convenient to use and simple to operate, only unqualified products need to be put into the deplating liquid in a room-temperature environment, after a certain time, after a plating layer is completely removed, the unqualified products are washed with water, and a metal base material is not damaged.

The invention discloses a waste lead-acid storage battery dilute acid resourceful treatment process based on nanofiltration-electrodialysis synergetic waste heat evaporation, and belongs to the field of hazardous waste treatment. According to the process, impurities are removed through three-stage precision filtration (50 microns, 10 microns and 1 micron) and ultrafiltration (PVDF membrane) for the waste acid with the sulfuric acid concentration of 1.4%-2.3%, lead and cadmium ions are separated through an acid-resistant nanofiltration membrane (the molecular weight cutoff is 200-500 Da) (the rejection rate is larger than or equal to 95%), and low-heavy-metal acid liquor is obtained; and concentrating to 5-8% by electrodialysis, and purifying until the content of sulfuric acid is greater than or equal to 15% and the content of lead residue is less than or equal to 3.0 mg / L in combination with single-effect waste heat evaporation (60-80 DEG C), and directly recycling for electrolyte compounding. After the nanofiltration concentrated water and the electrodialysis waste liquid are neutralized and precipitated, the lead content of the sludge is greater than or equal to 5% (HW31 hazardous waste), and the lead curing rate is greater than or equal to 99.5%. Through a membrane separation and waste heat utilization synergistic technology, the recovery rate of sulfuric acid is greater than or equal to 85%, the sludge is reduced by 90%, the energy consumption is reduced by 50%, the problems of low recovery rate, high energy consumption and secondary pollution in low-concentration waste acid resourceful treatment are solved, and high efficiency and environmental friendliness are achieved.

The invention provides a copper ion interference eliminating method for electrochemically detecting the content of lead ions and cadmium ions. The technical problems of membrane pollution and blockage, high membrane maintenance and replacement cost, interference caused by introduction of additional metal ions, need of accurate control of the use amount of a masking agent and the like in the existing method adopting a heavy metal membrane and the masking agent are solved. The method comprises the following steps: based on a three-electrode system, carrying out i-t enrichment on a solution to be detected in an electrochemical cell of an electrochemical workstation by using a screen-printed electrode, setting the enrichment potential to be-0.5 V to-0.4 V, and setting sufficient enrichment time to complete enrichment of copper ions; after the enrichment is finished, replacing the screen-printed electrode with an acidified carbon nanotube / Nafion composite screen-printed electrode containing a three-electrode system, and detecting the content of lead ions and cadmium ions in the solution to be detected by using an electrochemical workstation and selecting a square wave anodic stripping voltammetry; the method can be widely applied to the technical field of heavy metal ion detection.

The invention discloses a process for realizing efficient recovery of wastewater Cd < 2 + > by using a calcium-iron-based hydrotalcite-like derivative, calcium-iron hydrotalcite precursors with different calcium-iron ratios are prepared by a coprecipitation method, calcium-iron bimetal oxides with different properties are obtained by changing the calcination temperature, and solid powder of the calcium-iron bimetal oxides is used as an adsorbent to be applied to a process for recovering heavy metal ions Cd < 2 + > in wastewater. And the removal efficiency of cadmium ions can be obviously enhanced by increasing the calcination temperature. A hydrotalcite-like material is used as a precursor, based on the ion exchange characteristic and the rich specific surface area of the hydrotalcite-like material, the simultaneous action of isomorphous substitution and adsorption of derived calcium iron oxide is realized to efficiently remove Cd < 2 + >, and the Cd < 2 + > is fixed in crystal lattices through the isomorphous substitution action, so that the Cd < 2 + > is inhibited from being dissolved in a water body again; the method has a good industrial application prospect in the aspect of heavy metal recovery.

To provide a ligand compound which is used for detecting a content of heavy metal ions in water environment, and enables formation of rare earth metal ions and a rare earth supermolecular sensor material for achieving microanalysis of cadmium ions at a particularly low detection limit, and a preparation method, and to provide a rare earth supermolecular sensor material, a sensor thin film, a fluorescent probe and a preparation method, and use.SOLUTION: A ligand compound has a structure represented by formula (I).SELECTED DRAWING: Figure 5

The invention belongs to the technical field of environmental heavy metal pollution treatment. The invention discloses humic-like substance intercalation modified attapulgite as well as a preparation method and application thereof. According to the method, a humus-like substance organic precursor is introduced into an attapulgite interlayer domain in a wet immersion and in-situ polycondensation combined mode, a humus-like substance is generated in situ through a polyphenol-Maillard reaction, and successful loading of the humus-like substance on the outer surface and the interlayer domain of attapulgite is achieved. Compared with a traditional method, the problems of insufficient organic matter loading capacity and poor stability are solved, and the adsorption performance of the material on heavy metal ions (such as Cd (II)) is remarkably improved. The prepared modified material has the characteristics of excellent adsorption performance, structural stability and environmental protection, is suitable for treating cadmium ion pollution in water and stabilizing cadmium ions in soil, and provides a new thought for development of a novel environmental remediation material.

The invention discloses application of an NtbHLH128 transcription factor in improving heavy metal cadmium resistance of plants, and belongs to the technical field of gene engineering. According to the invention, an NtbHLH128 gene knockout mutant plant is constructed through a gene editing technology, and the knockout mutant plant can maintain normal growth in a heavy metal cadmium polluted environment and shows remarkable cadmium stress resistance; meanwhile, the knockout mutant plant also has high enrichment capacity, cadmium ions in the environment can be enriched, and the heavy metal concentration in the environment is reduced. The regulation effect of the NtbHLH128 gene in heavy metal stress is defined, an important target gene is provided for cultivating new varieties of crops which are highly resistant to heavy metal stress and used for contaminated soil remediation, a theoretical basis is laid for ecological remediation work, and the NtbHLH128 gene has important application value.

The invention relates to a preparation method and application of an electrochemical sensor for in-situ growth of AuPt nanoparticles based on a ZnNi bimetal organic framework. A modification material ZnNi-MOF (at) AuPtNPs is dropwise added to the surface of a pretreated electrode, then a DNA hairpin H1 is added and fixed to the modification material through a gold-sulfur bond, meanwhile, a 3D-DNA Walker effect can be started through a target Cd < 2 + >, and a large number of DNA single chains S1 are obtained. The method comprises the following steps: adding a supernatant and a DNA hairpin H2 subjected to magnetic separation to an electrode modified with a DNA hairpin H1 in a dropwise manner so as to generate a CHA cycle reaction, and then adding a DNA hairpin H3 and a DNA hairpin H4 in a dropwise manner so as to trigger a hyperbranched HCR signal amplification strategy, so that more methylene blue is connected to the electrode, and an electric signal in a system is enhanced. And quantitative analysis of cadmium ions is realized by using electric signal change corresponding to the concentration change of methylene blue on the surface of the electrode caused before and after addition of Cd < 2 + >. The prepared electrochemical sensor shows relatively high sensitivity, relatively wide detection range, good selectivity and excellent practical application capability.

The invention discloses a device and a method for treating heavy metal wastewater through electrochemical adsorption. The method comprises a working electrode, a counter electrode, an insulation isolation part, a fixed frame and a direct-current power supply, the working electrode is formed by coating a graphite paper substrate with a composite electrode material containing titanium dioxide (TiO2), ferroferric oxide (Fe3O4), conductive carbon black and polyvinylidene fluoride (PVDF); the counter electrode is made of pure graphite paper and is parallel to the working electrode; the insulating isolation part is arranged between the working electrode and the counter electrode; the fixed frame is used for fixing the working electrode, the counter electrode and the insulated isolation component; the direct-current power supply is connected with the working electrode and the counter electrode. The device is formed by arranging a composite electrode and a graphite paper counter electrode in parallel, isolating by a polytetrafluoroethylene gasket, fixing by an acrylic plate and externally connecting a direct-current power supply. The electrode adsorbs Cd < + > in electrolyte-containing wastewater. By combining the high adsorbability of TiO2, the magnetic recovery characteristic of Fe3O4 and a conductive network, the method has the advantages of high efficiency, stability and easiness in recovery.

The invention belongs to the technical field of photocatalysts, and particularly relates to a twin-crystal zinc cadmium sulfide nanosheet, a composite photocatalyst and a preparation method and application thereof.The preparation method of the twin-crystal zinc cadmium sulfide nanosheet comprises the following steps that a zinc source, a diethylenetriamine aqueous solution and a sulfur source are mixed, a first solvothermal reaction is conducted, and a second solvothermal reaction is conducted; a zinc sulfide-diethylenetriamine composite precursor is obtained; mixing the zinc sulfide-diethylenetriamine composite precursor, a cadmium source and an organic solvent, and performing a second solvothermal reaction to replace part of zinc ions in crystal lattices of the zinc sulfide-diethylenetriamine composite precursor with cadmium ions to obtain a zinc cadmium sulfide-diethylenetriamine composite precursor; and dispersing the zinc cadmium sulfide-diethylenetriamine composite precursor in water, and carrying out hydrothermal reaction to remove diethylenetriamine molecules, thereby obtaining the twin crystal zinc cadmium sulfide nanosheet. The twin crystal interface can provide a preferential carrier migration channel, so that photo-induced electron-hole separation is further promoted, and the photocatalytic hydrogen production performance is improved.

The invention relates to the technical field of adsorbents, and discloses a cadmium ion selective adsorbent and a preparation method thereof. The invention relates to a water-based metal corrosion inhibitor which comprises the following components in parts by weight: 2-3 parts of amino undecanoic acid, 2-3 parts of citric acid, 0.45-0.6 part of NaOH, 4-6 parts of cellulose, 4-6 parts of thiourea, 4-6 parts of nano silicon dioxide, 450-650 parts of an MES buffer solution, 500 parts of a PBS buffer solution, 8-12 parts of a coupling agent, 8-12 parts of a cross-linking agent, 0.4-0.6 part of metallothionein and 20-30 parts of water. Metallothionein is bonded with carboxyl on the surfaces of the carbon dots through an amide reaction and is bonded with modified cellulose through a large number of hydrogen bonds, the bonding capacity of the metallothionein and the modified cellulose is greatly enhanced, and the stability of the adsorbent is improved. The adsorbent prepared by the invention has excellent selective adsorption to cadmium, has excellent tolerance to some common coexisting interfering ions in a water body, and has excellent industrial application prospects.

The invention discloses a cadmium telluride thin film battery cadmium chloride spraying monitoring and control system and method. The system comprises a material preparation module used for preparing and storing a cadmium chloride solution containing a cadmium ion fluorescent probe; the spraying module is used for uniformly spraying the solution containing the probe to the surface of the cadmium telluride substrate to form a liquid film; the on-line detection module is used for collecting a liquid film fluorescence image through an optical detection unit and measuring the conductivity of the liquid film in a non-contact manner through a conductivity detection unit; and the data processing and control module is used for carrying out fusion analysis on the fluorescence image and the conductivity data, calculating the coverage rate, the uniformity and the cadmium chloride content of the liquid film in real time, and dynamically adjusting spraying parameters and probe injection parameters according to an analysis result, so as to realize closed-loop accurate control of the coating process. The problems that in the prior art, real-time performance is poor, blind areas exist in microcosmic distribution detection, and control precision is insufficient are effectively solved, and the consistency of the coating technology and the material utilization rate are improved.

The application relates to the technical field of adsorbents, and discloses a cadmium ion selective adsorbent and a preparation method thereof, which is prepared from the following raw materials in parts by weight: 2-3 parts of aminoundecanoic acid, 2-3 parts of citric acid, 0.45-0.6 parts of NaOH, 4-6 parts of cellulose, 4-6 parts of thiocyanogen, 4-6 parts of nano silicon dioxide, 450-650 parts of MES buffer solution, 500 parts of PBS buffer solution, 8-12 parts of a coupling agent, 8-12 parts of a crosslinking agent, 0.4-0.6 parts of metallothionein and 20-30 parts of water. The application bonds the metallothionein and the carbon dot surface carboxyl through an amide reaction, and combines the modified cellulose through a large number of hydrogen bonds, so that the combination capacity of the two is greatly enhanced, and the stability of the adsorbent is improved. The prepared adsorbent has excellent selective adsorption for cadmium, excellent tolerance for some common coexisting interfering ions in water bodies, and excellent industrial application prospect.

This scheme discloses a method for adsorbing cadmium ions in the field of heavy metal adsorption technology, specifically: using acylhydrazone-sodium alginate-Ca 2+ Composite adsorbent for heavy metal Cd 2+ Adsorption occurs, wherein the acylhydrazone-sodium alginate-Ca 2+ The composite adsorbent is prepared by reacting salicylhydrazine with sodium hydroxide after alkalization and oxidation with sodium periodate to form a salicylhydrazone compound, which is then cross-linked with sodium alginate. The method described in this application can simultaneously reduce the amount of distiller's grains and the heavy metal Cd. 2+ Pollution.