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Method for treating hexavalent chromium-containing wastewater by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide compound

A technology of titanium dioxide and nickel cobaltate, applied in metal/metal oxide/metal hydroxide catalysts, special compound water treatment, reduced water/sewage treatment, etc., can solve the limitation of photocatalytic efficiency and fast recombination rate, and limit the utilization of solar energy High potential industrial application value, low cost and improved structure

Inactive Publication Date: 2020-03-27
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the photocatalytic efficiency of TiO is limited by the fast recombination rate of photogenerated electrons and holes
Moreover, anatase TiO2 with a large band gap (~3.2eV) can only be excited by ultraviolet light, which obviously limits the utilization of solar energy.

Method used

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  • Method for treating hexavalent chromium-containing wastewater by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide compound
  • Method for treating hexavalent chromium-containing wastewater by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide compound
  • Method for treating hexavalent chromium-containing wastewater by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide compound

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Effect test

Embodiment 1

[0037] A method for treating waste water containing hexavalent chromium by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide composite of the present invention comprises the following steps:

[0038] (1) Uniformly grind commercial titanium dioxide (P25) and sodium borohydride (NaBH4) (mass ratio 2 to 3), in N2 Heating at 300-400°C for 2 hours in the atmosphere, and using 0.1mol L of the obtained all-black sample -1 After repeated washing with hydrochloric acid and deionized water, and collected by centrifugation, the black titanium dioxide powder was obtained after drying the all-black sample in a vacuum oven at 70°C for 12 hours;

[0039] (2) Weigh 2-3 mmol of cobalt nitrate hexahydrate, 7-8 mmol of nickel nitrate hexahydrate, and 2-3 mmol of black titanium dioxide, add the three into 70 ml of deionized aqueous solution, place it on a magnetic stirrer and stir for 30 minutes until the solution is uniform, and obtain the first a mixed solution; ...

Embodiment 2

[0047] A method for treating waste water containing hexavalent chromium by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide composite of the present invention comprises the following steps:

[0048] (1) Uniformly grind commercial titanium dioxide (P25) and sodium borohydride (NaBH4) (mass ratio 2 to 3), in N 2 Heating at 300-400°C for 2 hours in the atmosphere, and using 0.1mol L of the obtained all-black sample -1 After repeated washing with hydrochloric acid and deionized water, and collected by centrifugation, the black titanium dioxide powder was obtained after drying the all-black sample in a vacuum oven at 70°C for 12 hours;

[0049] (2) Weigh 2-3 mmol of cobalt nitrate hexahydrate, 7-8 mmol of nickel nitrate hexahydrate, and 2-3 mmol of black titanium dioxide, add the three into 70 ml of deionized aqueous solution, place it on a magnetic stirrer and stir for 30 minutes until the solution is uniform, and obtain the first a mixed solution;...

Embodiment 3

[0057] A method for treating waste water containing hexavalent chromium by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide composite of the present invention comprises the following steps:

[0058] (1) Uniformly grind commercial titanium dioxide (P25) and sodium borohydride (NaBH4) (mass ratio 2 to 3), in N 2 Heating at 300-400°C for 2 hours in the atmosphere, and using 0.1mol L of the obtained all-black sample -1 After repeated washing with hydrochloric acid and deionized water, and collected by centrifugation, the black titanium dioxide powder was obtained after drying the all-black sample in a vacuum oven at 70°C for 12 hours;

[0059] (2) Weigh 2-3 mmol of cobalt nitrate hexahydrate, 7-8 mmol of nickel nitrate hexahydrate, and 2-3 mmol of black titanium dioxide, add the three into 70 ml of deionized aqueous solution, place it on a magnetic stirrer and stir for 30 minutes until the solution is uniform, and obtain the first a mixed solution;...

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Abstract

The invention relates to a method for treating hexavalent chromium-containing wastewater by photocatalytic reduction of a nickel oxide-nickel cobaltate-black titanium dioxide compound. The method comprises the following steps: preparing black titanium dioxide, dissolving cobalt nitrate hexahydrate, nickel nitrate hexahydrate and the black titanium dioxide in a proper amount of deionized water, magnetically stirring to form a uniform solution, adding a proper amount of polyvinylpyrrolidone (PVP, K30) into the solution, and stirring the suspension with a magnetic stirrer for at least 1 hour; dispersing urea into the suspension, grinding powder, and calcining the powder in a tubular furnace in air at 500 DEG C for 2 hours to obtain the nickel oxide-nickel cobaltate-black titanium dioxide compound; adding the nickel oxide-nickel cobaltate-black titanium dioxide compound into the hexavalent chromium-containing wastewater; taking out the mixture at a certain time interval, immediately filtering, measuring the concentration of the treated hexavalent chromium at 540nm by using an ultraviolet-visible spectrophotometer according to a 1, 5-diphenylcarbazide method, and calculating the removalrate. The method has the advantages of high removal rate, low treatment cost, environmental friendliness and the like.

Description

technical field [0001] The invention relates to a method for treating waste water containing hexavalent chromium by photocatalytic reduction of nickel oxide-nickel cobaltate-black titanium dioxide composite, belonging to the technical field of sewage treatment. Background technique [0002] In recent years, with the public's increasing awareness of environmental protection, various new water treatment technologies have emerged as the times require. Photocatalytic technology is considered to be one of the new water treatment technologies with great development potential. Due to its direct use of sunlight and its environmental friendliness, it is attracting more and more attention. The vigorous development of the metallurgical and mining industries has resulted in an increasing amount of wastewater containing heavy metal hexavalent chromium discharged into the environment, posing a huge threat to the environment. Wastewater containing hexavalent chromium is difficult to be b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C02F1/30C02F1/70C02F101/22
CPCB01J23/755C02F1/30C02F1/70C02F2305/10C02F2101/22B01J35/39
Inventor 张娅许姗王宏归
Owner YANGZHOU UNIV
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