Preparation method of binary load-type TiO2/nano-iron/SBA-15 catalyst

Abstract

The invention provides a preparation method of a binary load-type TiO2 / nano-iron / SBA-15 catalyst. The method comprises the following steps: preparing butyl titanate hydrolysis buffering liquid; preparing a load-type TiO2 / SBA-15 catalyst; and preparing the binary load-type TiO2 / nano-iron / SBA-15 catalyst, i.e. the black binary load-type TiO2 / nano-iron / SBA-15 catalyst, and sealing and storing the catalyst under an oxygen-free condition. The preparation method has the effects that a Si-O-Ti bond, which is formed in the preparation process of the binary load-type TiO2 / nano-iron / SBA-15 catalyst, can effectively improve the load firmness of the TiO2 in an SBA-15 molecular sieve duct, and the structure of a molecular sieve is not damaged in the loading process. Meanwhile, the collapse and shrinkage of the duct can be avoided, the large-specific-surface-area mesoporous structure of the load-type TiO2 / SBA-15 catalyst can be maintained, and the specific surface area can reach up to 300 m<2> / g above. The compounding of a photon-generated carrier can be alleviated to a certain extent, and the photo catalytic efficiency can be improved by more than 55 to 77 percent.

Description

technical field [0001] The invention relates to inorganic functional materials and fine chemical preparation technology, and is a binary loaded TiO 2 / The preparation method of nanometer iron / SBA-15 catalyst. Background technique [0002] Photocatalytic technology is an emerging environmental purification technology, and its practical research and development has received extensive attention. Most of the catalysts used for photocatalytic degradation of pollutants in the environment are N-type semiconductor materials, such as TiO 2 , ZnO, CdS, WO 3 , Fe 2 o 3 etc., where TiO 2 Because of its high activity, good chemical stability, non-toxicity, low cost, and no pollution to the environment, it has become the most important photocatalyst. But TiO 2 It also has some disadvantages, such as wide band gap, narrow excitation wavelength range, and low utilization efficiency of sunlight. [0003] Currently, for raising TiO 2 There are two main methods for photocatalytic effi...

AI Technical Summary

Problems solved by technology

[0005] With SBA-15 molecular sieve as the carrier, the TiO 2 loaded on SBA-15 molecular sieve to prepare supported TiO 2 / SBA-15 catalyst, this method can effectively solve TiO 2 reunion problem, making TiO 2 The nanoparticle size is well dispersed on the surface and in the channel of SBA-15 molecular sieve, however, for TiO 2 The problems of low quantum yield of nanoparticles and high recombination rate of photogenerated carriers have not yet been solved.

in TiO 2 Surface deposition of noble metals (such as Pd, Ag, Pt, Ru, etc.) is an effective method to capture photogenerated electrons. This method can effectively separate photogenerated electrons and holes, reduce the recombination of photogenerated carriers, and improve the TiO 2 photocatalytic efficiency, however, noble metals are relatively expensive, making this method more costly

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