Zinc oxide/ZnFe-LDH@ biochar visible-light-driven photocatalyst as well as preparation method and application thereof
A technology of biochar and zinc oxide, which is applied in the field of photocatalytic materials, can solve the problems of easy agglomeration, easy recombination of electrons and holes, and poor mobility of photogenerated electrons, and achieve the effects of avoiding agglomeration, simple preparation, and promoting separation
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Embodiment 1
[0036] A preparation method for modified biochar, the method comprising the following steps:
[0037](1) Weigh 20g of rice husk biomass into a beaker containing 500ml of pure aqueous solution, stir and wash for 30min, after suction filtration, place in an oven at 80°C to dry overnight, take out the dried biomass, and grind to 100 mesh. Take 5g of biomass into a mortar, put it into a tube furnace, and calcinate at 400°C for 2h (heating rate: 5°C / min) under nitrogen atmosphere to obtain biochar.
[0038] (2) Weigh 2.5g of biochar into a reagent bottle for acidification, put the reagent bottle into an ice water container, place the ice water container on a magnetic stirrer, and add 25ml of HNO while stirring 3 , and then continue to add 25ml H 2 SO 4 The solution was stirred for 2 hours, and then filtered and washed until the filtrate pH=3-4, and placed in an oven at 80° C. for overnight drying.
[0039] The biochar obtained in this example was evaluated for photocatalytic deg...
Embodiment 2
[0043] A preparation method of zinc oxide / ZnFe-LDH nanometer visible light catalyst with visible light catalytic activity, the method comprises the following steps:
[0044] (1) Weigh 1.785g of zinc nitrate hexahydrate and 0.808g of ferric nitrate nonahydrate into a reagent bottle containing 10ml of methanol solution, and ultrasonically promote their dissolution.
[0045] (2) Weigh 0.64g of sodium hydroxide into a reagent bottle containing 40ml of methanol solution, and ultrasonically promote its dissolution. Pour the mixed salt solution of step (1) into it, place it on a magnetic stirrer, and stir rapidly for 10 min at room temperature. Then using methanol solution, the resulting mixture was centrifuged and washed twice, resuspended in 40ml methanol solution, placed in a 50ml hydrothermal kettle, put into an oven, and hydrothermally heated at 100°C for 4h.
[0046] (3) Remove the solution in the hydrothermal kettle of step (2) into a 50ml centrifuge tube, centrifuge to disca...
Embodiment 3
[0051] A method for preparing zinc oxide / ZnFe-LDH@ biochar with visible light catalytic activity, the method comprising the following steps:
[0052] (1) Weigh 20g of rice husk biomass into a beaker containing 500ml of pure aqueous solution, stir and wash for 30min, after suction filtration, place in an oven at 80°C to dry overnight, take out the dried biomass, and grind to 100 mesh. Take 5g of biomass into a mortar, put it into a tube furnace, and calcinate at 400°C for 2h (heating rate: 5°C / min) under nitrogen atmosphere to obtain biochar.
[0053] (2) Weigh 2.5g of biochar into a reagent bottle for acidification, put the reagent bottle into an ice water container, place the ice water container on a magnetic stirrer, and add 25ml of HNO while stirring 3 , and then continue to add 25ml H 2 SO 4 The solution was stirred for 2 hours, and then filtered and washed until the filtrate pH=3-4, and placed in an oven at 80° C. for overnight drying.
[0054] (3) Weigh 0.2 g of bioch...
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