Optimization of enhanced UV photodegradation of Malachite Green using sediment@TiO2 composite

IF 1.7 4区化学 Q4 CHEMISTRY, PHYSICAL Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-05-30 DOI:10.1007/s11144-024-02651-9

Imane El Mrabet, Youssef Fahoul, Mohamed Belghiti, Zineb Bencheqroun, Zineb Chaouki, Redouan El Khalfaouy, Redouane Haounati, Abdelhak Kherbeche, Karim Tanji, Hicham Zaitan

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Abstract

This research paper investigates the photodegradation of Malachite Green (MG) using a new composite of river sediment (Sd) and synthesized TiO₂ (Sd-TiO₂-X%). TiO₂ powder was synthesized using the sol–gel method and catalyst composites Sd-TiO₂-X% (X = 10%, 15%, and 20%) were obtained using the wet impregnation. The photocatalytic performance of the composites was investigated using Box–Behnken design and results in the optimal parameters of %TiO₂ (%) = 19.73, [MG] (ppm) = 42.25, and pH 9.58. Furthermore, Sd-TiO₂-20% demonstrated exceptional stability and performance after undergoing five cycles. The scavenging tests for free radicals strongly confirmed the activity of superoxide ions (O₂^⋅−) and hydroxyl radicals (^⋅OH) as the primary species responsible for degrading MG. The findings highlight the synergetic effect between river sediment and TiO₂ in the photodegradation of organic pollutants-contaminated wastewater. This confirms the potential of valorizing sediments for promising and sustainable depollution applications using sediment-based materials.

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利用沉积物@TiO2 复合材料增强孔雀石绿紫外光降解的优化方案

本研究论文探讨了孔雀石绿（MG）的光降解问题，采用的是一种新的河流沉积物（Sd）与合成 TiO2（Sd-TiO2-X%）的复合材料。采用溶胶-凝胶法合成了二氧化钛粉末，并通过湿法浸渍获得了催化剂复合材料 Sd-TiO2-X%（X = 10%、15% 和 20%）。采用 Box-Behnken 设计法研究了复合材料的光催化性能，并得出了最佳参数：%TiO2 (%) = 19.73、[MG] (ppm) = 42.25 和 pH 值 9.58。此外，Sd-TiO2-20% 在经过五个循环后表现出了卓越的稳定性和性能。自由基清除测试有力地证实了超氧离子（O2⋅-）和羟自由基（⋅OH）的活性，它们是降解 MG 的主要物质。研究结果凸显了河道沉积物和 TiO2 在光降解有机污染物污染废水过程中的协同效应。这证实了利用沉积物为基础的材料进行有前景和可持续的去污染应用的潜力。

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来源期刊

Reaction Kinetics, Mechanisms and Catalysis CHEMISTRY, PHYSICAL-

CiteScore

3.30

自引率

5.60%

发文量

201

审稿时长

2.8 months

期刊介绍： Reaction Kinetics, Mechanisms and Catalysis is a medium for original contributions in the following fields: -kinetics of homogeneous reactions in gas, liquid and solid phase; -Homogeneous catalysis; -Heterogeneous catalysis; -Adsorption in heterogeneous catalysis; -Transport processes related to reaction kinetics and catalysis; -Preparation and study of catalysts; -Reactors and apparatus. Reaction Kinetics, Mechanisms and Catalysis was formerly published under the title Reaction Kinetics and Catalysis Letters.