Regulation of synthesis pH value and post-treatment of ZSM-5 for improving adsorption and photocatalytic properties of TiO2/ZSM-5 composites

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2024-11-23 DOI:10.1016/j.apt.2024.104730

Cheng Wang, Fuling Du, Lipeng Wang, Qianru Yu, Xinchao Liang, Siqi Liu, Zhe Lei

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Abstract

TiO₂/ZSM-5 composites with enhanced adsorption and photocatalytic properties were synthesized via regulation of synthesis pH value and post (acid/alkali) treatment of ZSM-5. The influences of synthesis pH values and post-treatment of ZSM-5 on microstructure, adsorption and photocatalytic properties of the composites were investigated. The methyl orange was used to assess the adsorption and photocatalytic properties of the samples. The results showed that the synthesis pH values and acid/alkali treatment had significant influences on the microstructure, adsorption and photocatalytic properties of TiO₂/ZSM-5 composites. The composites synthesized at pH 7 had a relatively higher TiO₂ content, smaller anatase crystallite size, greater specific surface area, the most effective separation of photogenerated electron-hole pairs, the fastest interfacial charge transfer, and therefore exhibited excellent adsorption and photocatalytic properties. Acid treatment could significantly increase the specific surface area, Si/Al ratio of ZSM-5, the separation efficiency of photogenerated electron-hole pairs, and amount of produced active free radicals •O₂^– and •OH. The TiO₂/acid-treated ZSM-5 exhibited excellent photodegradation with 99.3 % methyl orange in 150 min, which is higher than that of the TiO₂/ZSM-5 and TiO₂/alkali-treated ZSM-5.

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调节合成 pH 值和 ZSM-5 后处理以改善 TiO2/ZSM-5 复合物的吸附和光催化性能

通过调节合成 pH 值和对 ZSM-5 进行后（酸/碱）处理，合成了具有增强吸附和光催化性能的 TiO2/ZSM-5 复合材料。研究了合成 pH 值和 ZSM-5 后处理对复合材料微观结构、吸附和光催化性能的影响。用甲基橙评估了样品的吸附和光催化性能。结果表明，合成 pH 值和酸碱处理对 TiO2/ZSM-5 复合材料的微观结构、吸附和光催化性能有显著影响。在 pH 值为 7 时合成的复合材料 TiO2 含量相对较高，锐钛矿晶粒尺寸较小，比表面积较大，光生电子-空穴对分离效果最好，界面电荷转移速度最快，因此具有优异的吸附和光催化性能。酸处理可显著增加 ZSM-5 的比表面积、硅/铝比、光生电子-空穴对的分离效率以及产生的活性自由基 -O2- 和 -OH 的数量。经 TiO2/酸处理的 ZSM-5 具有优异的光降解性能，在 150 分钟内甲基橙的降解率达到 99.3%，高于经 TiO2/ZSM-5 和 TiO2/ 碱处理的 ZSM-5。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)