Ag/AgCl/MIL-100(Fe)/PAN复合材料的制备及其去除水中Cr(Ⅵ)的性能

doi:10.16085/j.issn.1000-6613.2023-2021

摘要/Abstract

摘要：

采用原位生长法在室温下将铁基金属-有机框架材料[MIL-100(Fe)]负载在腈纶（PAN）上，然后通过光还原沉积法将Ag/AgCl纳米颗粒沉积于MIL-100(Fe)/PAN表面，制得Ag/AgCl/MIL-100(Fe)/PAN复合材料，并对复合材料结构、形貌及吸光性能等进行了表征。探讨了Cr(Ⅵ)初始浓度、初始pH、光照及H₂O₂等催化条件对复合材料光催化去除Cr(Ⅵ)性能的影响，并对光催化反应机理进行了分析。结果表明，Ag/AgCl的引入可显著提高复合材料对可见光的吸收能力。在15mg/L Cr(Ⅵ)溶液中加入0.32mL/L 30% H₂O₂，在溶液初始pH=3的条件下，用1000W氙灯光照下处理60min，6g/L复合材料对Cr(Ⅵ)去除率达到93%，重复使用5次后对Cr(Ⅵ)的去除率仍可达74%。光催化过程中e^-和·O₂^-起到还原作用。

关键词: Ag/AgCl, MIL-100(Fe), 复合材料, 催化, 废水

Abstract:

Iron-based metal organic framework material [MIL-100(Fe)] was loaded onto polyacrylonitrile (PAN) at room temperature using in-situ growth method, and then Ag/AgCl nanoparticles were deposited on the surface of MIL-100(Fe)/PAN by photo-reduction deposition to obtain Ag/AgCl/MIL-100(Fe)/PAN composites. The crystal structure, morphology and optical absorption performance of the composites were characterized by a series of methods. The effects of initial concentration, initial pH, light and H₂O₂ on the photocatalytic removal performance of Cr(Ⅵ) by composite materials were explored, and the photocatalytic reaction mechanism was analyzed. The results showed that the introduction of Ag/AgCl could significantly improve the absorption capacity of the composites for visible light. Under the condition of 1000W xenon lamp illumination for 60min, 15mg/L Cr(‍Ⅵ) solution added 0.32mL/L 30% H₂O₂ and initial pH=3, the removal rate of 6g/L composite for Cr(Ⅵ) reached 93%. After 5 times reuse, the removal rate of composite for Cr(Ⅵ) could still reach 74%. During the photocatalytic process, e^- and ·O₂^- played reducing roles.

Key words: Ag/AgCl, MIL-100(Fe), composite, catalysis, waste water

中图分类号:

X703.1

范婷婷, 张洋洋, 王春梅. Ag/AgCl/MIL-100(Fe)/PAN复合材料的制备及其去除水中Cr(Ⅵ)的性能[J]. 化工进展, 2024, 43(12): 6828-6837.

FAN Tingting, ZHANG Yangyang, WANG Chunmei. Preparation of Ag/AgCl/MIL-100(Fe)/PAN composite and its performance of removing Cr(Ⅵ) in water[J]. Chemical Industry and Engineering Progress, 2024, 43(12): 6828-6837.

图/表 13

图1 复合材料的SEM图（放大30000倍）

图2 AAMP复合材料的EDS图

图3 复合材料的N2吸附-脱附等温线和孔径分布

表1 复合材料的比表面积、孔容和孔径

样品	比表面积/m²·g^-1	孔容/cm³·g^-1	孔径/nm
MP	93.08	0.04	3.38
AAMP	68.92	0.03	4.26

图4 复合材料的XRD图

图5 AAMP复合材料的XPS谱图

图6 复合材料的UV-vis DRS光谱图和禁带宽度

图7 Cr(Ⅵ)初始浓度对复合材料去除Cr(Ⅵ)效果的影响

图8 Cr(Ⅵ)溶液初始pH对复合材料去除Cr(Ⅵ)效果的影响

图9 催化条件对复合材料去除Cr(Ⅵ)效果的影响

图10 复合材料的重复使用性能

图11 光催化反应不同时间后Cr(Ⅵ)的吸收光谱

图12 不同自由基捕获剂对复合材料去除Cr(Ⅵ)效果的影响

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