水滑石与海泡石复合材料对有机染料的光催化降解性能

引用本文: 金力, 曾虹燕, 徐圣, 陈超容, 段恒志, 杜金泽, 胡果, 孙云鑫. 水滑石与海泡石复合材料对有机染料的光催化降解性能[J]. 催化学报, 2018, 39(11): 1832-1841. doi: 10.1016/S1872-2067(18)63120-1 shu

Citation: Li Jin, Hong-Yan Zeng, Sheng Xu, Chao-Rong Chen, Heng-Zhi Duan, Jin-Ze Du, Guo Hu, Yun-Xin Sun. Facile preparation of sepiolite@LDH composites for the visible-light degradation of organic dyes[J]. Chinese Journal of Catalysis, 2018, 39(11): 1832-1841. doi: 10.1016/S1872-2067(18)63120-1 shu

水滑石与海泡石复合材料对有机染料的光催化降解性能

湘潭大学化工学院, 湖南湘潭 411105
基金项目:
湖南省自然科学基金会（湘潭市）联合研究项目（2016JJ5030）；湖南省2011年化学工程技术协同创新中心与湖南省教育厅环境效益和资源有效利用合作项目（17C1526）；湘潭大学博士创业基金（17QDZ05）；湘潭大学本科创新实验项目（2017XJ067）.

摘要: 由于ZnCr-LDH纳米粒子具有良好的光催化性能，但极易团聚，在一定程度上制约了它在光催化领域的应用.将水滑石制成核-壳复合材料可以避免粒子团聚，改善其单分散性和稳定性，从而提高光催化活性.本文设计了一种水滑石/海泡石（Sep@LDH）纳米复合材料作为光催化剂，以甲基橙（MO）和亚甲基蓝（MB）混合溶液模拟有机染料废水，进行光催化反应.通过XRD，SEM，UV-Vis DRS，PL，TG-DTG和BET/BJH，证明了水滑石成功的生长在海泡石的表面，通过光催化实验详细研究了Sep@LDH纳米复合材料的光催化性能及光降解反应机理.
采用共沉淀制备了不同Zn/Cr摩尔比的水滑石纳米材料，对水滑石进行优化，结合表征分析，发现摩尔比为1的ZnCr-LDH其结晶度、层间规整度高，禁带宽度最窄（2.30eV）和光致发光性能最佳.因而用作后续复合材料的制备.
另一方面，我们以酸活化的海泡石（Sep）为载体，采用原位生长法成功制备了一种新型的水滑石/海泡石（Sep@LDH）光催化剂，研究了海泡石的添加量对复合材料性能的影响.结果表明，Sep含量对复合材料形貌、粒径大小、结构以及光学性质影响较大.其中，样品Sep₄@LDH（海泡石添加量为4g），比表面积最大，因而光催化效率最高.降解动力学结果表明，染料的光降解过程遵循准一级动力学模型.
我们通过对活性物种（·OH，h⁺，·O₂^-）的考察，研究了光催化降解机理.结果表明，·OH在光降解过程中起着至关重要的作用.Sep₄@LDH复合材料循环使用5次后，MO和MB的光降解率依然分别可以达到86.2%和84.9%，表现出较高的稳定性.

关键词:

English

Facile preparation of sepiolite@LDH composites for the visible-light degradation of organic dyes

College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
Received Date: 15 April 2018
Revised Date: 04 June 2018
Fund Project:
This work was supported by the Joint Research Program of Hunan Provincial Natural Science Foundation (Xiangtan) of China (2016JJ5030), Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization and General project of Hunan Provincial Education Department (17C1526), PhD Startup Foundation of Xiangtan University (17QDZ05), and Xiangtan University undergraduate innovative experiment program (2017XJ067).

Abstract: Sepiolite@LDH (Sep@LDH) composites were designed and prepared based on the assembly of layered double hydroxides (LDH) on acidified sepiolites (Sep) for the simultaneous photocatalytic degradation of methyl orange (MO) and methylene blue (MB). The structure, morphology, texture, optical properties, and photocatalytic performance of the prepared Sep@LDH were studied in detail. Among the Sep@LDH composites, Sep₄@LDH (4.0 g Sep) exhibited the highest photocatalytic activity under visible-light irradiation, which could be attributed to its large surface area, high crystallinity, and plentiful active sites on its surface. The photodegradation of the dyes followed a pseudo first-order kinetic model (Langmuir-Hinshelwood model), indicating that the copious and homogeneous active sites on the surface of the composites contributed to the high photocatalytic activity. The photodegradation mechanism was studied by examining the active species (·OH, h⁺, and·O₂^- anions) using appropriate scavengers. It was found that·OH radicals played a critical role in the photocatalytic process of MO and MB, where the generation of·OH radicals occurred on the electron/hole (e^-/h⁺) pairs on the surface of the Sep@LDH composites.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

水滑石与海泡石复合材料对有机染料的光催化降解性能

English

Facile preparation of sepiolite@LDH composites for the visible-light degradation of organic dyes

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中国化学会秘书处

水滑石与海泡石复合材料对有机染料的光催化降解性能

English

Facile preparation of sepiolite@LDH composites for the visible-light degradation of organic dyes

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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