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A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst

A technology of titanium dioxide and synthesis method, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of reducing the hydrophobic stability of hydrophobic materials, the toxic price of silane coupling agents, and no practical application value, etc. Achieve high UV and visible light activity, good hydrophobic stability, and low toxicity

Inactive Publication Date: 2011-12-07
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These organic functional groups are easily absorbed by TiO under light 2 degraded, thereby greatly reducing the hydrophobic stability of the hydrophobic material
In addition, many F-containing silane coupling agents are toxic and expensive, and have no practical application value

Method used

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  • A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst
  • A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst
  • A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst, comprises the following steps:

[0037] (1) Preparation of MCF

[0038] Add 8.0g of P123 to 40mL of dilute hydrochloric acid and 260ml of distilled water, stir at 37°C until dissolved. Then add 0.1g NH 4 F and 4.0 g of TMB (1,3,5-trimethylbenzene), mechanically stirred for 1 hour. 18.3ml of TEOS was added dropwise at 37°C, and mechanically stirred for 20 hours. The resulting slurry was hydrothermally heated at 100°C for 24 hours, washed and precipitated, vacuum-dried at 60°C for 12 hours, and then calcined at 550°C for 6 hours to obtain MCF mesoporous Molecular sieve.

[0039] (2) MCF loaded TiO2 2 Catalyst preparation

[0040] Weigh titanium sulfate (Ti(SO 4 ) 2 ) solid 1.2g, added to 25ml twice distilled water, magnetically stirred for 30min, after the titanium sulfate was completely dissolved, then added 0.8g of prepared MCF mesoporous molecular sieve, stirred for...

Embodiment 2

[0051] A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst, the method comprises the following steps:

[0052] (1) Preparation of foamy mesoporous molecular sieve (mesocellular foam silica, MCF)

[0053] Weigh a certain amount of triblock polymer polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO, P123) at 37°C, dissolve in hydrochloric acid solution, the concentration of hydrochloric acid is 1.5mol / L, P123 The concentration in the mixed solution of hydrochloric acid and distilled water is 0.02g / ml, then add NH 4 F and 1,3,5-trimethylbenzene (TMB), P123, NH 4 The weight ratio of F and 1,3,5-trimethylbenzene is 8:0.1:4, stir for 1 hour, add tetraethyl orthosilicate (TEOS), tetraethyl orthosilicate (TEOS) and hydrochloric acid solution at the same temperature The volume ratio is 1:16, stirred for 20 hours, the resulting slurry was transferred to an autoclave, heated in water at 100°C for 24 hours, washed and precipitated,...

Embodiment 3

[0059] A kind of synthetic method of ammonium fluoride modified titanium dioxide visible light catalyst, the method comprises the following steps:

[0060] (1) Preparation of foamy mesoporous molecular sieve (mesocellular foam silica, MCF)

[0061] Weigh a certain amount of triblock polymer polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO, P123) at 37°C, dissolve in hydrochloric acid solution, the concentration of hydrochloric acid is 1.8mol / L, three The concentration of the block polymer polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO, P123) in the mixed solution of hydrochloric acid and distilled water is 0.03g / ml, and then NH 4 F and 1,3,5-trimethylbenzene (TMB), triblock polymer polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO, P123), NH 4 The weight ratio of F and 1,3,5-trimethylbenzene is 8:0.1:4, stir for 1 hour, add tetraethyl orthosilicate (TEOS), tetraethyl orthosilicate (TEOS) and hydrochloric acid solution at the same temper...

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Abstract

The invention relates to a synthesis method for a visible photocatalyst by modifying titanium dioxide (TiO2) by using ammonium fluoride (NH4F). The synthesis method comprises three steps of: preparing a mesocellular foam silica (MCF) molecular sieve, preparing an MCF carrying TiO2 catalyst and modifying MCF / TiO2 by using the NH4F. Compared with the prior art, the carrying catalyst MCF / TiO2 is subjected to NH4F hydrophobic modification through a hydrothermal process and a low-temperature vacuum activation method; as a mesoporous material has extremely high absorption capability, the visible photocatalyst has outstanding absorption performance and catalyzing and degrading performance on ultraviolet and visible light of high-concentration organic pollutants during degrading of organic compounds, such as rhodamine B and the like; furthermore, during hydrophobic modification, if isopropyl alcohol is found to be a solvent, the NH4F hydrophobic modification effect of the prepared catalyst isthe optimal and the hydrophobic stability is quite good; moreover, the synthesis method is simple in operation and low in cost, and the raw materials are easily obtainable.

Description

technical field [0001] The invention relates to the field of nano photocatalytic materials, in particular to a kind of mesoporous MCF as a carrier, and TiO is loaded in its pores 2 , A synthetic method of ammonium fluoride-modified titanium dioxide visible light catalyst. Background technique [0002] With the development of society, environmental pollution has become a major problem hindering the survival and development of human beings. People urgently need a clean way to solve environmental pollution. Photocatalysis can effectively use sunlight to degrade environmental pollutants. while TiO 2 With its non-toxic, safe, efficient, cheap and easy to obtain, it has become the most potential photocatalytic material in the field of environmental pollution control. TiO 2 It is widely used as a photocatalyst due to its good practicability and strong oxidizing property. Many studies have focused on TiO 2 Surface modification to improve its UV and visible light activity, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C02F1/28C02F1/30B01D53/44B01D53/86C02F101/30
Inventor 张金龙邢明阳何云翔綦殿禹方文章
Owner EAST CHINA UNIV OF SCI & TECH
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