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TiO2/CN23 photocatalyst and preparation method and application thereof

A photocatalyst, g-c3n4 technology, applied in the field of visible light catalysis, can solve the problems such as not found, and achieve the effect of mild conditions, enhanced catalytic effect, and simple preparation process

Inactive Publication Date: 2018-08-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

g-C 3 N 4 in the five C 3 N 4 is the most stable, but no natural g-C has been found 3 N 4 , so the presently occurring g-C 3 N 4 are synthetic

Method used

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  • TiO2/CN23 photocatalyst and preparation method and application thereof
  • TiO2/CN23 photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of CN23 crystals: Weigh 1 g of g-C prepared from urea 3 N 4 , 1.5g of g-C prepared from melamine 3 N 4 , after being ground into powder, mixed thoroughly, and washed 4 times with absolute ethanol and ultrapure water respectively. After centrifugation and precipitation, it was dried to obtain a yellow powder, which was named CN23.

Embodiment 2

[0023] TiO 2 Preparation of / CN23 photocatalyst: take an appropriate amount of TiO 2 Centrifuge twice with distilled water, then once with ultrapure water, and dry the sediment for later use. TiO 2 And the CN23 described in step (1) with the TiO of 10wt%, 20wt%, 30wt%, 40wt% 2 Mix and dissolve in 100ml of water respectively to form a suspension. Put it into an ultrasonic instrument and sonicate for 30 min, then transfer to a magnetic stirrer, and stir magnetically for 6 h. Centrifuge and take the precipitate. After drying, put it into a box-type resistance furnace and raise the temperature from room temperature to 500°C at 2.5°C / min. After reaching 500°C, keep the constant temperature for 2h. After cooling to room temperature, take it out, grind it once, then wash and dry it to get the modified catalyst TiO 2 / CN23.

Embodiment 3

[0025] Evaluation of photocatalytic activity: 30min under visible light, 20wt% TiO 2 When the dosage of / CN23 catalyst is 40mg, the COD of eutrophication raw water Mn , NH 3The removal effect of -N, TN, TP and Chl-a is better, among them, the removal effect of Chl-a and TP is remarkable, and the removal rate of Chl-a can reach 95%.

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Abstract

The invention belongs to the technical field of visible light catalysis and relates to a TiO2 / CN23 photocatalyst and a preparation method and application thereof The invention is intended to modify g-C3N4 photocatalyst and apply the modified catalyst to the treatment of eutrophicated raw water. A modifying method herein includes: mixing g-C3N4 made with urea, and g-C3N4 made with melamine to the ratio of 2:3 so as to obtain a CN23 and TiO2-support to prepare TiO2 / CN23. TiO2 / CN23 has regular crystal form, and is in bead shape, gathering together. The main structure of the crystal is g-C3N4 andTiO2 particles embedded in the surface of g-C3N4; g-C3N4 can inhibit TiO2 aggregation so that TiO2 is dispersed, light can be fully absorbed, and catalytic efficiency is improved. The preparation process of the catalyst herein is simple, the conditions are mild, the stability is good, the cost is low, and the catalyst has the advantages of high catalytic efficiency, good environmental friendlinessand energy efficiency, zero toxicity and pollution and the like, meets the requirement on environmental friendliness and has a promising application prospect.

Description

Technical field: [0001] The invention belongs to the technical field of visible light catalysis and relates to a TiO 2 / CN23 photocatalyst and its preparation method and application. Background technique: [0002] In recent years, drinking water sources in most cities and towns in my country have been polluted to varying degrees, and drinking water safety is facing a huge challenge. The source of drinking water is deteriorating day by day, and the treatment of eutrophic raw water has become a research hotspot. Eutrophic raw water has been widely concerned due to the pollution of organic matter, nitrogen, phosphorus and other chemical substances. How to effectively treat this water source to ensure the safety of drinking water has become the focus of current research fields. The treatment of nutrient raw water is imminent. The conventional treatment process used by waterworks today is not effective in removing pollutants in water. After years of continuous efforts and expl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J27/24C02F2209/08C02F2209/18C02F2209/16C02F2209/14C02F2305/10B01J35/39
Inventor 李宛科王利平凌泽玉彭慧蒋善庆许霞
Owner CHANGZHOU UNIV
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