187 results about "Cadmium ion" patented technology

The invention relates to the technical field of soil regeneration, in particular to a method for degrading cadmium-polluted soil based on a heavy metal passivator, which comprises the following steps: S1, preparing PB-MgAl-LDH; s2, carrying out magnetic modification on the PB-MgAl-LDH; s3, preparing a passivating agent; and S4, soil remediation. Solid powder with a good specific surface area and adsorption activity is prepared through steady-state coprecipitation of pine barks and magnesium-aluminum hydrotalcite at a preferable specific growth position, a unique interlayer structure after magnetic modification has magnetism, negative charges are easily generated, adsorption of cadmium is accelerated for balancing the charges, and the adsorption efficiency of cadmium is improved. Meanwhile, lattice diffusion, isomorphous replacement and the like occur, so that the cadmium ion adsorbent shows relatively high ion exchange capacity and adsorption capacity to cadmium ions.

The invention relates to halophilous bacillus (Halophilous sp.) HMF09, and the preservation number of the halophilous bacillus is CGMCC (China General Microbiological Culture Collection Center) No.30475. The strain has high saline-alkaline tolerance and efficient cadmium ion immobilization capability, and can be applied to reduce the ion activity of heavy metal cadmium in soil, reduce stress of saline-alkaline on crops and promote crop growth.

The invention discloses a method for detecting cadmium ions and lead ions in a water body by utilizing a screen-printed electrode electrochemical sensor, which comprises the following steps of: constructing the screen-printed electrode electrochemical sensor by taking a screen-printed electrode of which the surface of a reaction end is modified with a ZIF-8 / MWCNT nano composite material as a working electrode; the method comprises the following steps: detecting the peak current change of a to-be-detected cadmium / lead ion solution by using a screen-printed electrode electrochemical sensor, and calculating the concentrations of cadmium ions and lead ions in the to-be-detected cadmium / lead ion solution by using a linear regression equation of the cadmium ion concentration, the lead ion concentration and the peak current change. The method provided by the invention has the advantages of simple operation, low cost, high detection efficiency, high detection accuracy and the like, can realize on-site detection of cadmium ions and lead ions in a water body, and has the advantages of convenient operation, high accuracy, strong anti-interference capability to interference factors, and good application prospect. The method is of great significance to efficient detection of heavy metal cadmium ions and lead ions in the water environment.

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 structure-reversible intervariant metal frame adsorption material and a preparation method and application thereof, and belongs to the technical field of adsorption materials, and the preparation method comprises the following steps: dissolving anhydrous calcium chloride and 2, 5-pyrazine dicarboxylic acid in a mixed solvent, then adding concentrated nitric acid, carrying out a heating reaction, continuing to activate the obtained solid product at 50-420 DEG C for 24 h, filtering, washing, and drying to obtain the structure-reversible intervariant metal frame adsorption material. And realizing structural transformation to obtain the intervariant metal frame adsorption material with the reversible structure. The reversible intervariant metal framework provided by the invention provides a new strategy for research and development of multifunctional MOFs materials, so that the material can adjust the pore characteristics and the three-dimensional space structure according to the temperature change, and the macroscopic adsorption performance is obviously influenced. The preparation process provided by the invention is simple and convenient, and a new strategy is provided for cadmium ion sewage treatment.

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 relates to the technical field of substance detection, in particular to a paper-based chip for detecting cadmium ions by LIBS (Laser-induced Breakdown Spectroscopy) as well as a preparation method and application of the paper-based chip. The preparation method comprises the following steps: 1) mixing a zinc salt solution and a sodium sulfide solution, and reacting to obtain a ZnS nano-particle solution; (2) mixing the ZnS nano-particle solution, polyvinylpyrrolidone and an acid solution to obtain a ZnSNPs (zinc single nucleotide polymorphisms) modified solution; and 3) mixing the ZnSNPs modified solution with a filter paper sheet, oscillating, adding an alcoholic solution, cleaning and drying. The paper-based chip provided by the invention can efficiently enrich the heavy metal element cadmium in the water body so as to carry out LIBS detection, and high-sensitivity, rapid and efficient detection of the heavy metal Cd in the water body can be well realized by combining the LIBS technology with the provided paper-based chip.

The invention discloses a cadmium-containing wastewater treatment method and system, and the treatment method comprises the following steps: S1, culturing selenastrum capricornutum and microcystis aeruginosa, carrying out cell digestion, centrifuging, and dispersing to obtain mixed algae cells; s2, co-incubating the mixed algae cells and a sodium selenite solution to obtain incubated mixed algae cells; and S3, adding the incubated mixed algae cells into the cadmium-containing wastewater for treatment. Through the combined action of the selenastrum capricornutum and the microcystis aeruginosa, a large amount of cadmium ions in the cadmium-containing wastewater can be absorbed, the purpose of wastewater purification is achieved, and the method has the advantages of being low in energy consumption, high in efficiency, free of secondary pollution, low in treatment cost, green, clean, sustainable in development and the like.

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.

The invention relates to the technical field of heavy metal ion adsorption, in particular to a preparation method of mineral modified biochar for adsorbing heavy metal cadmium ions, which comprises the following specific steps: mixing and stirring crushed minerals and crushed biomass to obtain a mixture; placing the mixture in a porcelain crucible, and placing the porcelain crucible in an atmosphere furnace for carbonization to obtain mineral modified biochar; wherein the crushed mineral is crushed and sieved meerschaum or Wulan tea spar with uniform particle size; the crushed biomass is water hyacinth, bagasse, rice husks, corn stalks, peanut stalks, peanut shells, rice stalks or luffa stems which are crushed and sieved and have uniform particle sizes. The preparation method of the mineral modified biochar is simple in step and low in cost, and the prepared mineral modified biochar has a good adsorption effect on cadmium and has a good application prospect in the technical field of heavy metal ion adsorption.

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 discloses a red mud-based heavy metal adsorption material and a preparation method and application thereof, the red mud-based heavy metal adsorption material is prepared from the following raw materials in parts by weight through the steps of pretreatment, main reaction and aftertreatment, the raw materials are red mud and chitosan, and the mass ratio of the red mud to the chitosan is (1-3): (2-4). The red mud-based heavy metal adsorption material is suitable for heavy metal pollutant treatment. The method is simple and convenient in preparation, low in cost and excellent in adsorption performance, lead, zinc and cadmium ions in water can be effectively removed, and the composite material is easy to recycle and regenerate.

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.