Modified biomass carbon for reducing effective state chromium in soil and preparation method and application of modified biomass carbon
A technology of biomass charcoal and biomass, which is applied in the fields of application, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of non-specific adsorption of heavy metals, molecular sieve modification fixation performance, and small particles of powdered activated carbon. Inexpensive, effective, enhance the effect of organic matter content
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[0028] A preparation method of modified biochar for reducing available chromium in soil, the steps are as follows:
[0029] Add a certain ratio of trimethylammonium salt, N,N'-methylenebisacrylamide and biomass activated carbon into the conical flask, and after standing in the dark for 10-24 hours, add an appropriate amount of initiator to it, and ultrasonically After dissolving, transfer it to a boric acid glass test tube, pass an inert gas to remove oxygen under ice bath conditions; then seal the test tube with a rubber stopper, put it in a water bath at 50-80°C and continue to react for 8-16 hours. After the reaction is over, wash the polymer and remove it. After drying, the final product modified biochar material can be obtained.
[0030] The trimethylammonium salt is a substance having both an ethylenic bond and a trimethylammonium group, which can be methacryloyloxyethyltrimethylammonium chloride and allyltrimethylammonium chloride, but not limited to this.
[0031] Th...
Embodiment 1
[0036] A modified biochar material for reducing available chromium in soil, the specific preparation method of which is as follows:
[0037] (i) Add 40mmol methacryloyloxyethyltrimethylammonium chloride solution, 40mmol N,N′-methylenebisacrylamide solution, and 20g coconut shell charcoal into a 50mL Erlenmeyer flask, and place it in a dark environment set for 10 hours;
[0038] (ii) Add 40 mmol potassium persulfate to the Erlenmeyer flask of step (i), ultrasonically dissolve the mixed solution and transfer it to a boric acid glass test tube, pass nitrogen gas to remove oxygen under ice bath conditions, cover with a rubber stopper and seal it well before putting it into Polymerization was initiated in a water bath at 60°C for 8 hours;
[0039] (iii) A polymer obtained by breaking up the adhered polymer after the reaction is completed. The product was put into a Buchner funnel for suction filtration and washing, repeated extraction and elution with water and methanol, and the ...
Embodiment 2
[0041] A modified biochar material for reducing available chromium in soil, the specific preparation method of which is as follows:
[0042] (i) Add 80mmol methacryloyloxyethyltrimethylammonium chloride solution, 40mmol N,N'-methylenebisacrylamide solution, and 50g bamboo charcoal into a 50mL Erlenmeyer flask, and let it stand in the dark for 24 hours later;
[0043] (ii) Add 40 mmol potassium persulfate to the Erlenmeyer flask of step (i), ultrasonically dissolve the mixed solution and transfer it to a boric acid glass test tube, pass argon to deoxygenate under ice bath conditions, cover with a rubber stopper and seal it well Throw it into a 70°C water bath to initiate polymerization and last for 12 hours;
[0044] (iii) After the reaction is completed, crush the adhered polymer to obtain the polymer, put the product into a Buchner funnel for suction filtration and washing, repeatedly extract and elute with water and methanol, and obtain the final product after drying.
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