10 results about "Cadmium adsorption" patented technology

The invention relates to the technical field of woody peat humus compositions, in particular to an iron-modified woody peat humus composition and application thereof in synchronous passivation of cadmium and arsenic in soil, and the iron-modified woody peat humus composition comprises the following raw materials: woody peat, a composite iron modifier, ammonium sulfate, monopotassium phosphate and microbial fermentation liquor. The composite iron modifier overcomes the problem that free iron is easy to precipitate in acid soil, and ensures stable release and efficient utilization of iron ions; secondly, iron ions can be subjected to complex reaction with carboxyl, phenolic hydroxyl and other functional groups in humic acid to form a stable organic-inorganic compound; zeolite can remarkably improve the cadmium adsorption capacity and enhance the dispersity of iron active components through ion exchange, and cadmium and arsenic are synchronously and efficiently passivated.

The invention provides a preparation method of a modified biochar material and application of the modified biochar material in cadmium-containing wastewater treatment, and relates to the technical field of biochar adsorbent preparation. The method comprises the following steps: pretreating biomass, loading Fe2O3 nanoparticles on the surface of the biomass, mixing the product with potassium carbonate, pre-carbonizing, modifying by using sodium sulfide, and finally calcining to obtain the modified biochar material. According to the technical scheme, the sulfur-containing functional groups and the Fe2O3 nanoparticles are modified on the biochar at the same time, a large number of active sites can be provided for the biochar, meanwhile, the passivation effect on cadmium is synergistically improved, efficient adsorption of cadmium is achieved, pre-carbonization can enter the biochar by means of CO2 generated in the thermal decomposition process of potassium carbonate to generate pore channels, and the adsorption efficiency of cadmium is improved. The material is endowed with more pore structures, and the specific surface area and adsorption capacity of the modified material are improved. By adopting the preparation method provided by the invention, the modified biochar material with excellent cadmium adsorption performance can be prepared.

The invention relates to the field of microbial screening, and particularly discloses a bacillus strain capable of reducing vegetable heavy metal accumulation and application, the technical scheme is that the method comprises the following steps: i, collecting a healthy plant root system in a cadmium polluted area, and preparing a root system attached bacterium suspension; ii, diluting the bacterial suspension in a gradient manner, and then coating the diluted bacterial suspension on an LB solid culture medium plate for purification to obtain a pure bacterial strain; and iii, inoculating the pure strains to LB solid culture medium plates containing different concentrations of cadmium, and screening out tolerant strains of which the bacterial colony diameter is not less than 2 mm on a 100 mg / L cadmium concentration plate and the bacterial colony diameter is not less than 1 mm on a 150 mg / L cadmium concentration plate. According to the preparation method, the bacterial colony growth diameter under the specific cadmium concentration gradient and the cadmium adsorption rate threshold value under the specific liquid culture condition are set as screening standards, and the bacillus strain with the high heavy metal adsorption and immobilization capacity is obtained.

The present application relates to the technical field of intelligent agriculture, and particularly relates to a cadmium low-adsorption potato cultivation system, which comprises: a genotype-phenotype prediction module, which is used for receiving genotype data of potato germplasm resources, processing the genotype data by using a basic genotype-phenotype correlation model based on machine learning, and outputting cadmium adsorption potential rating data of the potato germplasm resources to a selection and screening decision module; the selection and screening decision module is used for outputting a selection scheme data containing optimal germplasm identification and cultivation parameters by using a multi-objective optimization algorithm; the selection and screening decision module is further used for iteratively optimizing the basic genotype-phenotype correlation model and / or the multi-objective optimization algorithm according to cadmium adsorption capacity evaluation result data, so as to form a closed-loop feedback. The present application adopts a basic model combined with online iterative optimization, realizes rapid prediction of cadmium adsorption potential of potatoes and full-process automation and remote management of the low-cadmium high-yield target, and significantly improves breeding efficiency and precision.

The utility model discloses a kind of cadmium-inhibiting selenium-increasing conditioner chelation devices, it is related to chelation equipment technical field, the cadmium-inhibiting selenium-increasing conditioner chelation device includes: mixed cylinder subassembly, including first cylinder body and first stirring shaft, first stirring shaft is set to the inside of first cylinder body;Reaction cylinder subassembly, including second cylinder body, heating assembly and second stirring shaft;Stable cylinder subassembly, including third cylinder body, cooling unit, cooling unit is set to the bottom of third cylinder body;Blending bin subassembly, including bin body and third stirring subassembly, bin body is connected with second cylinder body, and third stirring subassembly is rotatably connected with bin body.The utility model is sequentially connected by mixed cylinder subassembly, reaction cylinder subassembly, stable cylinder subassembly and blending bin subassembly, in device, additional blending area of selenium source and cadmium adsorption material, by chelation reaction fixed cadmium ion, simultaneously release active selenium element, satisfy cadmium-inhibiting selenium-increasing, while realizing that cadmium-inhibiting selenium-increasing conditioner has stable product quality of product.

The application relates to the field of microbial screening, and specifically discloses a bacillus strain capable of reducing heavy metal accumulation in vegetables and an application, which adopts the following technical scheme: comprising the following steps: i. collecting healthy plant root systems in a cadmium contaminated area, and preparing a root system attached bacteria suspension; ii. gradient diluting the bacteria suspension, coating on LB solid culture medium plates for purification, and obtaining pure strains; iii. inoculating the pure strains on LB solid culture medium plates containing different concentrations of cadmium, and screening a tolerance strain with a colony diameter not less than 2 mm on a 100 mg / L cadmium concentration plate and a colony diameter not less than 1 mm on a 150 mg / L cadmium concentration plate. The preparation method sets the colony growth diameter under a specific cadmium concentration gradient and the cadmium adsorption rate threshold under specific liquid culture conditions as screening standards, and obtains a bacillus strain with high heavy metal adsorption and fixation capacity.

The application discloses a method for preparing an adsorbent by using landfill leachate and red mud, and comprises the following steps: (1) mixing the landfill leachate and the red mud uniformly to obtain organic mixed red mud, and then performing roasting treatment on the organic mixed red mud to obtain roasting mud; (2) mixing fly ash and the roasting mud uniformly, and then performing grinding to obtain roasting mixed powder mud; (3) mixing the landfill leachate and the roasting mixed powder mud uniformly, performing granulation, and then standing to obtain raw material particles; and (4) performing hydrothermal reaction on the raw material particles, wherein the hydrothermal liquid is the landfill leachate, after the hydrothermal reaction is completed, solid-liquid separation is performed, the particles after the hydrothermal reaction are dried, and the adsorbent is obtained. The application realizes the resource utilization of industrial waste, and the treatment process is simple; by coupling the roasting and the hydrothermal reaction of the mixed landfill leachate and the red mud, the adsorbent with high adsorption performance is prepared, and the highest mercury adsorption capacity and the highest cadmium adsorption capacity can reach 237 mg / g and 188 mg / g respectively.

The invention relates to the technical field of intelligent agriculture, in particular to a low-cadmium-adsorption potato cultivation system which comprises a genotype-phenotype prediction module used for receiving genotype data of potato germplasm resources, processing the genotype data by adopting a basic genotype-phenotype correlation model based on machine learning, and obtaining a genotype-phenotype prediction result; predicting and outputting cadmium adsorption potential rating data of the potato germplasm resources to a breeding and screening decision module; the breeding and screening decision module is used for outputting breeding scheme data containing optimal germplasm identification and cultivation parameters by adopting a multi-objective optimization algorithm; and the breeding and screening decision module also performs iterative optimization on the basic genotype-phenotype association model and / or a multi-objective optimization algorithm according to the cadmium adsorption capacity evaluation result data to form closed-loop feedback. According to the method, the mode of combining the basic model with online iterative optimization is adopted, rapid prediction of the cadmium adsorption potential of the potatoes and full-process automation and remote management of low-cadmium and high-yield targets are achieved, and the breeding efficiency and accuracy are remarkably improved.

The invention relates to the technical field of fertilizers, in particular to a fertilizer for reducing cadmium ion absorption of crops and a preparation method of the fertilizer. The invention relates to a preparation method of a fertilizer for reducing cadmium ion absorption of crops. The preparation method comprises the following steps: preparing sulfydryl modified LDH; activated biochar is prepared; and preparing the compound fertilizer. The preparation method comprises the following steps: dissolving magnesium nitrate hexahydrate and aluminum nitrate nonahydrate to form a mixed salt solution, adding a sodium hydroxide solution, carrying out a co-precipitation reaction to generate an MgLDH layered precursor, adding 3-mercaptopropyltrimethoxysilane, grafting sulfydryl to the surface of the LDH layered structure through a silane coupling effect, and carrying out a co-precipitation reaction to obtain the MgLDH-based composite material. Stable loading of sulfydryl is achieved through a hydrothermal crystallization reaction at the temperature of 120-130 DEG C, the sulfydryl modified LDH with a layered structure and high cadmium adsorption performance is finally formed, after the sulfydryl modified LDH is added into a fertilizer, the bio-availability of cadmium ions in soil can be remarkably reduced, and then absorption of the cadmium ions by crop roots and transfer of the cadmium ions to the overground part are effectively reduced.

The invention relates to the field of microorganisms, discloses an enterobacter strain capable of reducing vegetable heavy metal accumulation and application, and particularly relates to application of the enterobacter strain capable of reducing vegetable heavy metal accumulation in reducing vegetable heavy metal accumulation. The application comprises the following steps: pretreating the cadmium-polluted soil, after potting, adjusting the water content of the soil to 60% of the maximum water-holding capacity of a field, and balancing for 12 hours to form pretreated soil; transplanting brassicaceous vegetable seedlings into the pretreated soil, and applying enterobacter strains to vegetable rhizospheres after seedling recovery is performed for 3 days; and performing field management on the vegetables, and harvesting the vegetables after the vegetables grow to a harvesting period. The enterobacter strain Ktr32 is separated and screened from root systems of healthy pepper plants in a cadmium-polluted area, is natural, has physiological characteristics adaptive to a cadmium-polluted environment, has relatively strong cadmium tolerance, can stably survive in a medium-high-concentration cadmium stress environment, and also has efficient cadmium adsorption capacity.