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

Inactive Publication Date: 2017-05-31
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the photoreduction product of trivalent chromium is less toxic than hexavalent chromium, long-term exposure to high concentrations of trivalent chromium may also be harmful to the environment and human health, and trivalent chromium can be converted to highly toxic hexavalent chromium under some oxidizing conditions. Valence chromium

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  • Preparation method and application of graphene oxide-loaded titanium dioxide coupling material

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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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Abstract

The invention relates to a preparation method and application of a graphene oxide-loaded titanium dioxide coupling material. The coupling material is prepared by the following steps: carrying out preoxidation and deep oxidation on graphite powder and then carrying out ultrasonic treatment to obtain single-layer graphene oxide, preparing titanium dioxide through a sol-gel method and coupling the titanium dioxide to the graphene oxide. The preparation technology of the material is simple and industrial production is easy to implement. The prepared coupling material has photocatalytic activity of the titanium dioxide and has adsorptive property of the graphene oxide, and hexavalent chromium in wastewater can be effectively removed. A product can be applied to treatment of electroplating wastewater, leather tanning wastewater and printing and dyeing wastewater.

Description

Technical field [0001] The invention belongs to the field of environmental protection new materials and new water treatment technologies, and specifically relates to a preparation method and application of a graphene oxide supported titanium dioxide coupling material. Background technique [0002] Chromium is a common pollutant component in wastewater discharged from industries such as electroplating, leather tanning, printing and dyeing, metal processing, and textile production. Chromium exists in two stable valence states of hexavalent and trivalent in natural water and wastewater. Hexavalent chromium is more harmful to humans and the water environment due to its high mobility and non-biodegradable nature. In contrast, trivalent chromium is easy to precipitate and is less toxic. Therefore, reducing the highly toxic hexavalent chromium to low-toxic trivalent chromium is an effective way to treat hexavalent chromium wastewater. Photocatalytic reduction is considered to be one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J21/18C02F1/28C02F1/32B01J20/30C02F101/22
CPCB01J20/20B01J20/06B01J21/18B01J35/004C02F1/283C02F1/32C02F2101/22C02F2305/10
Inventor 胡新将赵运林王平王慧杨远秀徐正刚谭小飞江卢华方威王晓雪
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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