Preparation method and application of graphene oxide-loaded titanium dioxide coupling material
A technology of titanium dioxide and graphene, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc., can solve problems such as environmental and human health hazards, and achieve convenient operation, simple operation, and wide source of raw materials Effect
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Embodiment 1
[0018] A method for preparing the graphene oxide supported titanium dioxide coupling material of the present invention, the specific steps are as follows:
[0019] Mix 6 g graphite powder, 5 g K 2 S 2 O 8 And 5 g P 2 O 5 Add to 24 mL of concentrated sulfuric acid with a mass concentration of 98% and react at 80 ℃ for 4.5 hours. After cooling to room temperature, add 1000 mL of ultrapure water. After standing for 12 hours, the product will be washed to neutrality and then at 60 ℃. Dry to obtain pre-oxidized graphene; add the obtained pre-oxidized graphite to 240 mL of concentrated sulfuric acid with a mass concentration of 98%, and then add 5 g of NaNO 3 And 30 g KMnO 4 , React for 4 hours at 0 ℃, react at 35 ℃ for 2 hours, add 500 mL ultrapure water, react at 98 ℃ for 1 hour, then add 1000 mL ultrapure water and 40 mL concentrated H at room temperature 2 O 2 , Continue the reaction for 2 hours, wash the obtained product with HCl solution with a mass concentration of 10%, wash with ...
Embodiment 2
[0023] The graphene oxide supported titanium dioxide coupling material of the present invention is used for photocatalytic removal of hexavalent chromium in wastewater, including the following steps:
[0024] Take 1000 mL of hexavalent chromium wastewater with a mass concentration of 10 mg / L, adjust the pH value of the hexavalent chromium wastewater to 1-8 with negligible volume of sodium hydroxide or hydrochloric acid, and add 0.5 g to the above-mentioned hexavalent chromium wastewater Graphene oxide supported titanium dioxide coupling material, so that the mass concentration of the coupling material in the solution is 0.5 g / L, and the graphene oxide supported titanium dioxide coupling material is fully contacted and reacted with hexavalent chromium wastewater for 1 hour under the condition of no light irradiation. The temperature is 25 ℃, then the UV lamp covered with quartz glass is placed in the hexavalent chromium wastewater, and the wastewater is fully stirred and reacted fo...
Embodiment 3
[0029] The graphene oxide supported titanium dioxide coupling material of the present invention is used for photocatalytic removal of hexavalent chromium in wastewater, including the following steps:
[0030] Take 1000 mL of hexavalent chromium wastewater with a mass concentration of 10 mg / L, adjust the pH value of hexavalent chromium wastewater to 2 with negligible volume of sodium hydroxide or hydrochloric acid, and add 0.1 and 0.5 to the above-mentioned hexavalent chromium wastewater respectively , 1 g of graphene oxide is loaded with titanium dioxide coupling material, so that the mass concentration of the coupling material in the solution is 0.1, 0.5, 1 g / L, respectively, and the graphene oxide is loaded with titanium dioxide coupling material and hexavalent chromium under the condition of no light irradiation The wastewater is fully contacted and reacted for 1 hour, the reaction temperature is 25 ℃, then the UV lamp covered with quartz glass is placed in the hexavalent chrom...
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