Iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and preparation method thereof

A nano-titanium dioxide and co-doping technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problem of low photocatalytic activity, achieve high photocatalytic activity, easy recycling, and great social and economic benefits and industrial application prospects

Inactive Publication Date: 2010-07-21
河北地质大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to TiO 2 The forbidden band width is about 3.2eV, which requires ultraviolet light excitation, and the electron-hole pairs generated are easy to recombine, resulting in nano-TiO 2 Photocatalytic activity is not high

Method used

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  • Iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and preparation method thereof
  • Iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and preparation method thereof
  • Iron and chrome co-doped nano titanium dioxide/zeolite compound photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Zeolite surface negative charge modification: Weigh 25g zeolite and put it into a three-necked flask, add 0.5mL mercaptopropyltrimethoxysilane coupling agent and 0.5mL dehydrated ethanol mixed solution (coupling agent modification amount is 2wt% of zeolite), Heat the oil bath to 120°C, heat and stir at constant temperature for 30min to obtain zeolite modified by silane coupling agent; weigh 10g of silane-modified zeolite, add oxidant 4mL 30%H 2 o 2 Mix solution with 20mL HOAc (oxidation of mercapto group to 10 times the theoretical amount of sulfonic acid group oxidant), and oxidize at 50°C for 2h to obtain negatively charged zeolite.

[0025] Nano-TiO 2 / Loading of zeolite composite material: Weigh 15g of negatively charged zeolite, add 150mL of deionized water to make slurry; pipette 41.7mL of TiCl with a concentration of 1.93mol / L 4 Solution (TiO 2 TiCl required for theoretical loading of 30wt% 4 solution amount), while weighing 0.0207gFeCl 3 ·6H 2 O and 0.1319...

Embodiment 2～13

[0031] Embodiment 2~13: method is the same as above-mentioned embodiment, proportioning and condition are shown in Table 2.

[0032] The proportioning of embodiment 1~13 and condition table Table 2

[0033] implement

[0034] implement

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Abstract

The invention provides an iron and chrome co-doped nano titanium dioxide / zeolite compound photocatalyst and a preparation method thereof, and relates to sewage and waste gas treatment. The iron and chrome co-doped nano titanium dioxide / zeolite compound photocytalyst is characterized in that: nano TiO2 is doped with 0.5 to 2.5 weight percent of iron and chrome ions; the mass ratio of Fe3+ to Cr3+ is controlled to be 1:1-4; the Fe3+ and Cr3+ ions and Ti4+ ions with positive electricity are self-assembled on a zeolite substrate modified by negative electricity under the action of electrostatic attraction, the metal ions are combined together and then the zeolite substrate is baked to prepare the photocatalyst; and nano TiO2 crystals are mixed crystals of anatase crystals and rutile crystals. The iron and chrome co-doped nano titanium dioxide / zeolite compound photocatalyst has the advantages that: compared with the prior art, the compound material has the photocatalytic activity improved by over 40 percent, is filtered and dried for recycling, and then can still have relatively high photocatalytic activity; and the iron and chrome co-doped nano titanium dioxide / zeolite compound photocatalyst has the advantages of low cost, easy recycling, no pollution, great social and economic benefits, and good industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of sewage and waste gas treatment. Background technique [0002] The treatment of organic pollutants in sewage and waste gas is an important problem that needs to be solved urgently in the environmental field, and it is also a key problem that the country urgently needs to solve. Nano-semiconductor photocatalysis technology provides a new way for sewage and waste gas treatment. Using this technology can almost non-selectively mineralize all organic pollutants. It is considered to be the most environmentally friendly advanced treatment technology for environmental pollutants. TiO in semiconductor 2 Due to the advantages of no photocorrosion after exposure to light, good acid and alkali resistance, stable chemical properties, no toxicity to organisms, abundant sources, and high photocatalytic activity, it is the focus of current research. Nano-TiO 2 Due to the disadvantages of easy agglomeration and difficu...

Claims

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Application Information

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IPC IPC(8): B01J29/076B01J37/34
Inventor 李艳王程
Owner 河北地质大学
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