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Preparation method for cadmium sulfide based composite catalyst capable of processing industrial wastewater

A composite catalyst and industrial wastewater technology, applied in the chemical field, can solve the problems of lack of environmental engineering stability performance, catalyst recycling rate reduction, etc., achieve good cycle stability and recycling rate, excellent photogenerated carrier separation efficiency, resist Effects of Photocorrosion and Chemical Corrosion

Inactive Publication Date: 2018-09-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing nanometer-sized photocatalysts have high catalytic activity, they lack the stable performance required in environmental engineering applications, especially in industrial wastewater containing complex components and strong acid substances. The strong acidic external environment will Dissolves and corrodes the catalyst, which significantly reduces the recycling rate of the catalyst

Method used

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  • Preparation method for cadmium sulfide based composite catalyst capable of processing industrial wastewater
  • Preparation method for cadmium sulfide based composite catalyst capable of processing industrial wastewater
  • Preparation method for cadmium sulfide based composite catalyst capable of processing industrial wastewater

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preparation example Construction

[0038] A preparation method for a cadmium sulfide-based composite catalyst capable of treating industrial wastewater, comprising the following steps:

[0039] Step 1, add a certain amount of hydroxypropyl cellulose to 1000 ml of absolute ethanol solution, keep stirring for 1-6 hours, then add 10 ml of deionized water, and keep stirring for 30 minutes; Step 2, add 4-8 Milliliters of tetrabutyl titanate, continuously stirred for 30 minutes, centrifuged after standing for 6-10 hours to obtain titanium dioxide nanospheres, and washed 3-5 times with ethanol and deionized water successively; Step 3, the titanium dioxide nanospheres Add it to a certain amount of sodium hydroxide solution, stir for 2 hours, take it out and wash it with water; step 4, add titanium dioxide nanospheres to a certain amount of cadmium chloride solution, keep stirring for 1-2 hours, and then add A certain amount of sodium sulfide solution, continue to stir for 1-2 hours, take out and wash with water and dry...

Embodiment 1

[0044] The specific implementation method of the control experiment is as follows:

[0045] (1) 50 mL of rhodamine B dye solution to be treated, 50 mg of cadmium sulfide, titanium dioxide, CAR, CAR-H and CAR-0.35% catalyst were added respectively, and after 30 minutes of dark adsorption, the rhodamine B dye was degraded under visible light irradiation, wherein CAR Indicates cadmium sulfide-based (without strong acid immersion) composite catalyst, CAR-H indicates cadmium sulfide-based (without using sodium hydroxide as pretreatment) composite catalyst, CAR-0.35% indicates cadmium sulfide-based (final sample soaked in strong acid overnight) composite catalyst;

[0046] (2) The cycle stability performance of cadmium sulfide, CAR, CAR-H and CAR-0.35% was tested under neutral conditions, and the number of cycle tests was 5 times. Add 50 mg of catalyst to 50 mL of dye solution, and after 30 minutes of dark adsorption, degrade Rhodamine B dye under visible light irradiation. After e...

Embodiment 2

[0050] The treatment steps for acid mineral wastewater are as follows: configure acid mineral wastewater containing different concentrations of heavy metal ions, and the concentrations of its components are Fe 2+ =1004.35mg / L, Fe 3+ =998.43mg / L, Al 3+ =500.51mg / L, Mn 2+ =292.54mg / L, Cu 2+ =25.45mg / L, Zn 2+ =143.92mg / L, Ni 2+ =98.77mg / L, Cd 2+ = 18.22 mg / L. The acid mineral wastewater had an initial pH value of 1.97. Add 50 mg CAR-0.35% composite catalyst to 50 mL of the prepared acidic mineral wastewater, and then irradiate under visible light for 10 hours after dark adsorption for 30 minutes.

[0051] The experimental results are shown in the table below and figure 2 As shown, under the original pH=1.97 condition of acid mineral wastewater, Fe 2+ / Fe 3+ 、Al 3 + , Mn 2+ 、Cu 2+ , Zn 2+ 、Ni 2+ and Cd 2+ The ion removal effects can reach 81.53%, 93.41%, 52.12%, 66.60%, 43.02%, 69.62% and 61.03%, respectively. However, under the condition of pH=3.5, the composit...

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Abstract

The invention particularly relates to a preparation method for a cadmium sulfide based composite catalyst. The method comprises the following steps: (1) putting titanium dioxide nano microspheres intoa sodium hydroxide solution, performing stirring for 2 h, taking out the microspheres, and performing washing by using water; (4) putting the microspheres into a cadmium chloride solution, performingcontinuous stirring for 1-2 h, adding a sodium sulfide solution into the mixed solution, performing continuous stirring for 1-2 h, taking out the microspheres, performing washing by using water and performing drying; (5) performing calcination on the microspheres for 2-8 h in a tube furnace under the protection of a flowing nitrogen gas, wherein calcination temperature is 400-600 DEG C; and (6) putting the calcined microspheres into concentrated hydrochloric acid, performing soaking for 8-12 h, performing washing by using deionized water, and performing drying in a vacuum drying oven to obtain the cadmium sulfide based composite catalyst. Compared with a conventional cadmium sulfide catalyst having the disadvantage of poor stability, the cadmium sulfide based composite catalyst prepared by the method disclosed by the invention can effectively resist photo corrosion and chemical corrosion, and the catalyst has better cycle stability and a repeating utilization rate in practical applications.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a cadmium sulfide-based composite catalyst. Background technique [0002] As the most common industrial wastewater, acid wastewater mainly comes from electroplating, mining, textile, alloy and printing and dyeing industries. Normally, acidic wastewater mainly contains heavy metal ions and toxic organic pollutants, and the pH value of the sewage system is generally 2.0-5.0. Because it is toxic and non-biodegradable, the discharge of such acidic wastewater can seriously pollute environmental resources including soil, surface water, and groundwater, thereby disrupting ecosystem functions. Because these two components exist simultaneously in acidic wastewater, a step-by-step approach is usually adopted technically to treat heavy metal ions and organic pollutants, including chemical deposition, adsorption, coagulation, ion exchange, and membrane separation. Although these traditio...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J37/30C02F1/30C02F101/22C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J27/04B01J37/30C02F2305/10C02F2101/34C02F2101/345C02F2101/36C02F2101/38C02F2101/22B01J35/398B01J35/39
Inventor 邢明阳张金龙董陈成刘文元张维谭金林嵇家辉杜梦梦伊秋颖
Owner EAST CHINA UNIV OF SCI & TECH
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