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A visible light-responsive composite catalyst for degrading organic pollutants in saline wastewater and its preparation method

A technology of organic pollutants and composite catalysts, applied in water pollutants, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve surface active site occupation, catalytic activity reduction, disappearance, etc. problem, to achieve the effect of simple method, simple synthesis process and mild conditions

Inactive Publication Date: 2018-01-16
HANGZHOU JIUHE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the organic matter cannot be effectively adsorbed, the active sites on the surface of the catalyst will be occupied by ions, resulting in a reduction or even disappearance of the catalytic activity.

Method used

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  • A visible light-responsive composite catalyst for degrading organic pollutants in saline wastewater and its preparation method
  • A visible light-responsive composite catalyst for degrading organic pollutants in saline wastewater and its preparation method
  • A visible light-responsive composite catalyst for degrading organic pollutants in saline wastewater and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Catalyst preparation

[0041] Get 0.5g of silicon dioxide with hydrophilic surface (specific surface area 180m 2 / g), 200mL of absolute ethanol and 2mL of NaOH aqueous solution (10g / L) were placed in a flask, stirred and adsorbed in a 30°C water bath. After adsorption equilibrium (more than 12 hours), a stable adsorption water layer is formed on the surface of graphene oxide.

[0042] Another 50 mL of absolute ethanol in which 2.15 g of tetrabutyl titanate and 9 mg of ferric nitrate were dissolved was dropped into the adsorption equilibrium system drop by drop using a constant pressure funnel. Butyl titanate undergoes hydrolysis reaction in the adsorption water layer, and iron ions undergo precipitation reaction with hydroxide ions in the adsorption water layer, finally generating Fe(OH) 3 -TiO 2 , after the completion of the reaction for 5 hours, a suspension system containing composite particles was obtained.

[0043] Add the suspension system after the reacti...

Embodiment 2

[0053] (1) Catalyst preparation

[0054] Get 0.5g of silicon dioxide with hydrophilic surface (the specific surface area is 180m 2 / g), 200mL absolute ethanol and 2mL NaOH aqueous solution (10g / L) were placed in a flask, stirred and adsorbed in a water bath at 30°C. After adsorption equilibrium (more than 12 hours), a stable adsorption water layer is formed on the surface of graphene oxide.

[0055] Another 50 mL of absolute ethanol in which 2.15 g of tetrabutyl titanate and 27 mg of ferric nitrate were dissolved was dropped into the adsorption equilibrium system drop by drop using a constant pressure funnel. Butyl titanate undergoes hydrolysis reaction in the adsorption water layer, and iron ions undergo precipitation reaction with hydroxide ions in the adsorption water layer, finally generating Fe(OH) 3 -TiO 2 , after the completion of the reaction for 5 hours, a suspension system containing composite particles was obtained.

[0056] Add the suspension system after the r...

Embodiment 3

[0066] (1) Catalyst preparation

[0067] Get 0.5g of silicon dioxide with hydrophilic surface (the specific surface area is 180m 2 / g), 200mL absolute ethanol and 2mL NaOH aqueous solution (10g / L) were placed in a flask, stirred and adsorbed in a water bath at 30°C. After adsorption equilibrium (more than 12 hours), a stable adsorption water layer is formed on the surface of graphene oxide.

[0068] Another 50 mL of absolute ethanol in which 2.15 g of tetrabutyl titanate and 54 mg of ferric nitrate were dissolved was dropped into the adsorption equilibrium system drop by drop using a constant pressure funnel. Butyl titanate undergoes hydrolysis reaction in the adsorption water layer, and iron ions undergo precipitation reaction with hydroxide ions in the adsorption water layer, finally generating Fe(OH) 3 -TiO 2 , after the completion of the reaction for 5 hours, a suspension system containing composite particles was obtained.

[0069] Add the suspended system after the re...

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Abstract

The invention discloses a visible-light responded compound catalyst for degrading organic pollutants in salt-containing wastewater and a preparation method of the visible-light responded compound catalyst. The preparation method comprises the following steps: (1) mixing nano-silica, absolute ethanol and a sodium hydroxide water solution, and carrying out stirring and adsorbing in a water bath until a balanced adsorption system is formed; (2) dropwise adding an ethanol solution in which tetrabutyl titanate and iron salt are dissolved into the balanced adsorption system, so as to react to obtain a suspension system containing compound particles; and (3) transferring the suspension system into a high-pressure kettle, adding an ethanol solution in which rare earth ions are dissolved while stirring, closing the high-pressure kettle, carrying out thermal treatment, cooling and then separating reaction liquid, washing, and drying so as to obtain the visible-light responded compound catalyst. According to the preparation method, the crystallization process of TiO2 and Fe2O3 and the doping process of rare earth metal ions are finished by virtue of solvothermal in one step, so that the method is simple, and conditions are mild; by adjusting parameters in the reaction and thermal treatment processes, the shape and the performance of the photocatalyst can be effectively regulated and controlled.

Description

technical field [0001] The invention relates to the field of composite photocatalyst preparation and photocatalytic oxidation degradation of pollutants in a saline wastewater system, in particular to a preparation method of a visible light-responsive composite catalyst for degrading organic pollutants in saline wastewater. Background technique [0002] While the rapid development of my country's industrial economy has improved people's living standards, it has also brought serious environmental pollution problems. Water pollution represented by organic pollutants is an urgent environmental pollution problem to be solved. The organic matter in industrial and agricultural wastewater is highly toxic and has complex components, which is the direction of environmental governance efforts to overcome. Due to the variety of industries, the components of the wastewater produced are very complex, and the wastewater often contains a certain amount of salt concentration, such as coal ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J35/00C02F1/30
CPCB01J23/002B01J23/745B01J35/004B01J2523/00C02F1/30C02F2101/30C02F2305/10B01J2523/41B01J2523/47B01J2523/842
Inventor 王挺程文武陈碧
Owner HANGZHOU JIUHE ENVIRONMENTAL PROTECTION TECH CO LTD
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