Visible light photocatalyst for efficient reduction of hexavalent chromium and preparation method of visible light photocatalyst

A visible light, titanium dioxide technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as limited application, achieve high specific surface area, improve efficiency, and simple and convenient experimental steps.

Inactive Publication Date: 2017-09-05
EAST CHINA UNIV OF SCI & TECH
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 Its own bandgap width is 3.2eV, this wider bandgap width limits its utilization rate of sunlight, and TiO 2 The h

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Visible light photocatalyst for efficient reduction of hexavalent chromium and preparation method of visible light photocatalyst
  • Visible light photocatalyst for efficient reduction of hexavalent chromium and preparation method of visible light photocatalyst
  • Visible light photocatalyst for efficient reduction of hexavalent chromium and preparation method of visible light photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of inverse opal-structured titanium dioxide (i.o.TiO 2 )

[0029] Mix 26 mL of ethanol, 1 mL of acetylacetone (AcAc), 5.6 mL of isopropyl titanate (TTIP), 0.85 mL of hydrochloric acid (HCl), and 4.6 mL of deionized water, and stir at room temperature for about 2 hours to obtain a perfusate. Spread the prepared PS template monolayer on the petri dish, add the perfusion solution dropwise to the PS template, and keep the liquid level equal to the PS template. Dry overnight in air at 25°C, and then calcine in air at 500°C for 4 hours to remove the organic template after complete drying. After cooling, the samples were obtained by grinding.

Embodiment 2

[0031] Preparation of cobalt phosphate-supported inverse opal titania (Co-Pi / i.o.TiO 2 )

[0032] Mix 26 mL of ethanol, 1 mL of acetylacetone (AcAc), 5.6 mL of isopropyl titanate (TTIP), 0.85 mL of hydrochloric acid (HCl), and 4.6 mL of deionized water, and stir at room temperature for about 2 hours to obtain a perfusate. Spread the prepared PS template monolayer on the petri dish, add the perfusion solution dropwise to the PS template, and keep the liquid level equal to the PS template. Dry overnight in air at 25°C, and then calcine in air at 500°C for 4 hours to remove the organic template after complete drying. After cooling, grind to get i.o.TiO 2 sample. Dissolve 0.005 M sodium dihydrogen phosphate and 0.005 M disodium hydrogen phosphate in 50 mL deionized water and adjust to pH=7. After the solution was sonicated for 3 min, 0.5 mM cobalt nitrate hexahydrate was added to the solution, and after it was completely dissolved, 0.3 gi.o.TiO was added to the solution 2 pow...

Embodiment 3

[0034] Preparation of cobalt phosphate-supported P25 samples (Co-Pi / P25)

[0035] Dissolve 0.005 M sodium dihydrogen phosphate and 0.005 M disodium hydrogen phosphate in 50 mL deionized water and adjust to pH=7. After the solution was sonicated for 3 min, 0.5 mM cobalt nitrate hexahydrate was added to the solution, and after it was completely dissolved, 0.3 g of P25 powder was added to the solution, and the mixed solution was placed under a 1000 w 302 nm ultraviolet mercury lamp and stirred for 30 min, then centrifuged and washed with water Dry and grind to get the sample (Co-Pi / i.o.TiO 2 ).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a preparation method and application of an inverse opal structure titanium dioxide photocatalyst supported by cobalt phosphate. The main feature of the invention is that three-dimensional ordered polystyrene (PS) spheres are used as a template to prepare titanium dioxide with an inverse opal structure, and cobalt phosphate is loaded on the titanium dioxide material with an inverse opal structure by in-situ photodeposition. The sensitization of cobalt phosphate to inverse opal titanium dioxide is realized, so that the titanium dioxide can be excited to emit electrons under visible light and undergo a reduction reaction. The method adopted in the invention is simple and easy to operate, the catalyst can quickly and effectively reduce hexavalent chromium ions under the irradiation of visible light, and the valence band cycle of cobalt ions ensures the cycle stability of the catalyst.

Description

technical field [0001] The invention relates to the field of photocatalysis and the treatment of wastewater containing heavy metal ions. Background technique [0002] The photocatalytic reduction technology of hexavalent chromium is to use semiconductor materials to reduce highly toxic hexavalent chromium to low-toxic trivalent chromium by photogenerated electrons excited by light under sunlight or simulated sunlight. This simple method can effectively use sunlight as an excitation light source, and react at normal temperature and pressure, with low cost, and can simultaneously treat multiple pollutants with high efficiency. Therefore, semiconductor photocatalysis technology is considered to be a promising method for treating wastewater containing hexavalent chromium. [0003] In recent years, TiO 2 The photocatalyst as the main body is widely used in the aqueous reduction reaction of hexavalent chromium, and the TiO 2 A large number of photogenerated electrons will be re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01J27/185B01J37/08B01J37/34B01J35/10C02F1/70C02F101/22
CPCY02W10/37B01J27/1853B01J35/0013B01J35/006B01J35/10B01J37/0009B01J37/082B01J37/345C02F1/70C02F2101/22C02F2305/10
Inventor 刘勇弟雷菊英吕维佳
Owner EAST CHINA UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap