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Carbon nitride quantum dot-modified hierarchical-pore TiO2-SiO2 photocatalyst

A photocatalyst, quantum dot technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve high specific surface area, be beneficial to photocatalytic activity, and improve the effect of photocatalytic activity

Active Publication Date: 2018-11-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are few reports on the design of photocatalysts based on carbon nitride quantum dots, and there are basically no reports on the preparation of high-efficiency photocatalysts by combining carbon nitride quantum dots with hierarchical porous materials.

Method used

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preparation example Construction

[0028] Preparation of Carbon Nitride Quantum Dots (CNQDs):

[0029] Using urea and sodium citrate as precursors, a low-temperature solid hydrothermal method was used to prepare water-phase carbon nitride quantum dots after dialysis treatment. Specifically, 0.081 g of sodium citrate and 0.101 g of urea were ground and mixed evenly, and then transferred to the lining of a polytetrafluoroethylene reactor. Screw the stainless steel jacket tightly and seal it well, and keep it in an electric heating constant temperature blast drying oven at 180°C for 2h. After taking out the autoclave, let it cool naturally at room temperature, and ultrasonically wash the obtained brown solid three times with absolute ethanol, put it into a dialysis bag of MWCO3500 specification, and dialyze it in 20mL deionized water at room temperature for 24 hours to obtain light yellow carbon nitride quantum dots aqueous solution.

Embodiment 1

[0031] To synthesize Me-TSCN-IO, add carbon nitride quantum dots, pore forming agents such as P123, tetrabutyl silicate and isopropyl titanate during the preparation process, and use polystyrene as a template, specifically:

[0032] After adding 30mL of EtOH into a 50mL beaker, add 2g of P123 and stir for 30min until completely dissolved. Add 0.89mL tetrabutyl silicate (TEOS), 1mL HCl (4mol / L), 1mL inhibitor acetylacetone, 4.8mL isopropyl titanate (TTIP) and 5mL CNQDs aqueous solution into the transparent solution. After stirring at room temperature for 2 h, the precursor solution was perfused into the 355 nm PS template. After 3 days of hydrolysis in a constant temperature and humidity box at a temperature of 40 °C and a humidity of 55%, it was transferred to a 70 °C oven for drying for 3 days, and was calcined in a muffle furnace at 500 °C for 4 hours in an air atmosphere (heating rate 1 °C / min), so that titanium oxide and The carbon nitride quantum dots are compounded in t...

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Abstract

The invention relates to a carbon nitride quantum dot-modified hierarchical-pore TiO2-SiO2 photocatalyst and a preparation method thereof. The preparation method is mainly characterized in that the carbon nitride quantum dot-modified hierarchical-hole TiO2-SiO2 photocatalyst is prepared by introducing carbon nitride quantum dots in the process of synthesizing ordered hierarchical-pore TiO2-SiO2 bymeans of in-situ loading, and removing a template agent by means of calcining. Compared with the prior art, the preparation method used herein has good simplicity and operational convenience, enablesa raw material to be efficiently utilized, enables carbon nitride quantum dots to be loaded in pore walls of hierarchical-pore titania silica, thereby promoting the improvement of photocatalytic activity; the ordered hierarchical-pore structure also provides good passages for guest molecule diffusion and transfer and allows the prepared photocatalyst to provide good catalytic degrading activity for organic wastes, such as phenols and sulfadiazine, and antibiotic wastewater having actual high concentration.

Description

technical field [0001] The invention relates to the field of nanometer photocatalytic materials, and provides a novel photocatalyst and a preparation method thereof by loading carbon nitride quantum dots in the pore walls of titanium oxide and silicon oxide with a hierarchical porous structure in an in-situ loading manner. Background technique [0002] Mesoporous silica is a new type of nanomaterial developed in recent years. It has a specific surface area of ​​up to 1000m2 / g, continuously adjustable pore size and highly ordered channels, and high thermal stability. These excellent structural properties make them have great application value in catalysis, drug loading, exhaust gas adsorption, separation and purification, and solar photoelectric conversion. Once reported, they have attracted extensive attention in various related fields. Especially in recent years, with the continuous innovation of synthesis technology, various structures such as KIT, MSU and SBA mesoporous s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J27/24C02F2101/38C02F2101/40C02F2101/345C02F2305/10B01J35/39
Inventor 刘勇弟雷菊英俞洁张金龙王灵芝周亮蒋杰伦孙鲁颖杨帆张飞宇
Owner EAST CHINA UNIV OF SCI & TECH
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