Photocatalyst for degrading dye in wastewater and preparation method thereof

A photocatalyst and wastewater technology, applied in the field of photocatalysis, can solve the problems of uneven physical mixing, restricting catalyst performance, etc., and achieve the effects of improving reaction stability, low cost, and improving photocatalytic degradation rate.

Active Publication Date: 2017-11-03
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reaction stability of the catalyst has been partially improved, the inhomogeneity of physical mixing still restricts the improvement of catalyst performance to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Anhydrous zinc nitrate and anhydrous copper nitrate were mechanically mixed and ground for 20 minutes, and the molar ratio of zinc salt and copper salt was 1:1. Baking was performed at 300° C. for 3 hours in an air atmosphere. After cooling to room temperature, wash with deionized water three times, and dry at 80° C. for 2 h to obtain Cu-doped nano zinc oxide powder.

[0036] Add the powder obtained above to the aqueous solution of cetyltrimethylammonium bromide, and stir at 20°C for 4 hours; adjust the pH of the system (11-12) with concentrated ammonia water, and then add ethyl orthosilicate, Aging for 8h; wherein, the atomic number ratio of different materials is (the sum of Zn, Cu and Si): hexadecyltrimethylammonium bromide: ammonia: water = 1: 0.05: 20: 50, and the water in it is ten Water in hexaalkyltrimethylammonium bromide aqueous solution; after aging, filter and wash with suction, dry at 80°C for 6 h, roast at 300°C for 5 h, and cool to room temperature to ob...

Embodiment 2

[0040] After mechanically mixing zinc carbonate and basic copper carbonate, grind for 60 minutes, the molar ratio of zinc salt and copper salt is 400:1. Baking was performed at 500° C. for 1 hour in an air atmosphere. After cooling to room temperature, wash with deionized water for 3 times, and dry at 150° C. for 5 h to obtain Cu-doped nano zinc oxide powder.

[0041]Add the powder obtained above to the aqueous solution of cetyltrimethylammonium bromide, and stir at 50°C for 2 hours; adjust the pH of the system (12-13) with concentrated ammonia water, and then add ethyl orthosilicate, Aging for 8h; wherein, the atomic number ratio of different materials is (the sum of Zn, Cu and Si): hexadecyltrimethylammonium bromide: ammonia: water = 1: 0.20: 40: 100, wherein the water is ten Water in hexaalkyltrimethylammonium bromide aqueous solution; after aging, filter and wash with suction, dry at 150°C for 12 h, roast at 550°C for 10 h, and cool to room temperature to obtain mesoporou...

Embodiment 3

[0045] After mechanically mixing anhydrous zinc acetate and anhydrous copper acetate, grind for 40 minutes, the molar ratio of zinc salt and copper salt is 20:1. Baking was performed at 400° C. for 2 hours in an air atmosphere. After cooling to room temperature, it was washed three times with deionized water, and dried at 110 °C for 3 h to obtain Cu-doped nano-zinc oxide powder.

[0046] Add the powder obtained above to the aqueous solution of cetyltrimethylammonium bromide, and stir at 30°C for 3 hours; adjust the pH of the system (11-12) with concentrated ammonia water, and then add ethyl orthosilicate, Aging for 8h; wherein, the atomic number ratio of different materials is (the sum of Zn, Cu and Si): hexadecyltrimethylammonium bromide: ammonia: water = 1: 0.15: 30: 70, and the water in it is ten Water in hexaalkyltrimethylammonium bromide aqueous solution; after aging, filter and wash with suction, dry at 110°C for 8 h, roast at 500°C for 6 h, and cool to room temperature...

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PUM

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Abstract

The invention discloses a photocatalyst for degrading dyes in waste water and a preparation method thereof, belonging to the field of photocatalysis. The photocatalyst for degrading dyes in waste water of the present invention uses mesoporous silica as a carrier, and the nano-zinc oxide doped with copper is loaded on the mesoporous silica carrier; the mass fraction of zinc is 5-40%, copper The mass fraction of elements is 0.1‑5%. The photocatalyst of the invention for degrading dyes in waste water catalyzes and degrades methylene blue or rhodamine B in response to visible light, has low cost, high degradation efficiency and good stability.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a photocatalyst for degrading dyes in wastewater and a preparation method thereof. Background technique [0002] With the development of industry, water resources in many countries and regions have been polluted to varying degrees, and it has become increasingly serious, seriously threatening the natural environment and human health. Therefore, industrial sewage treatment has received more and more attention. Among these industrial wastewater, printing and dyeing wastewater has the characteristics of deep color, strong toxicity, refractory degradation, and large pH fluctuations, so it is difficult to effectively treat it by conventional methods. [0003] With the deepening of research in recent years, it has been found that photocatalysis has attractive application prospects in sewage treatment and solar energy conversion. Among them, photocatalytic oxidation, as a deep oxidation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76C02F1/30
CPCY02W10/37
Inventor 段永正李长海贾冬梅商希礼
Owner BINZHOU UNIV
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