MOF 气凝胶负载零价铁/TiO₂ 光芬顿降解三氯乙酸

Zero-Valent Iron/TiO₂ Supported on MOF Aerogel for Photo- Fenton Degradation of Trichloroacetic Acid

摘要

为突破传统修复方法的局限并充分发挥高级氧化工艺（AOPs）的协同潜力，本研究开发了一种光催化体系 TiO₂/MOF-808@SiO₂@Fe(0)，该复合结构整合了 SiO₂ 气凝胶的高比表面积与结构稳定性、MOF-808 的吸附多孔性、TiO₂ 的光催化效率以及零价铁的还原能力，用于在紫外光照射下高效降解三氯乙酸（TCA）。实验结果表明，在 pH=6、45 ℃条件下，该体系对 50 mL、质量浓度为 10 mg/L 的 TCA 实现约 94.2% 的 TCA 降解，这是由于 Fe²⁺、 Fe(0) 与 TiO₂ 之间的协同作用大幅提升了 TCA 去除效率，为水处理应用中难降解的有机氯化物去除提供了技术平台。

Abstract

To address the limitations of conventional remediation techniques and fully harness the synergistic potential of advanced oxidation processes (AOPs), this study developed a novel photocatalytic system, TiO₂/MOF-808@SiO₂@Fe(0), for the efficient degradation of trichloroacetic acid (TCA) under UV irradiation. The composite catalyst was synthesized via a multi-step procedure: first, a hierarchically porous SiO₂ aerogel support was prepared by the sol-gel method; next, MOF-808 nanocrystals were grown in situ within the aerogel matrix; then, UV-responsive TiO₂ nanoparticles were deposited; and finally, zero-valent iron (Fe(0)) was immobilized to activate the photo-Fenton pathway. This composite architecture combines the high specific surface area and structural stability of the SiO₂ aerogel, the adsorptive porosity of MOF-808, the photocatalytic efficiency of TiO₂, and the reductive capacity of zero-valent iron. Experimental results show that at pH 6 and 45 °C, using 50 mL of 10 mg/L TCA solution, the system achieved a high TCA degradation rate of approximately 94.2%. This high performance is attributed to synergistic interactions among Fe²⁺, Fe(0), and TiO₂, which together enable efficient TCA mineralization. The system thus represents a novel and promising technological platform for the removal of recalcitrant organochlorine compounds in water treatment.

关键词

芬顿反应 / 三氯乙酸降解 / 高级氧化工艺 / 二氧化钛 / MOF 气凝胶

Key words

Fenton reaction / TCA degradation / advanced oxidation–reduction process / TiO₂ / MOF-aerogel

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