Fe_(3)O_(4)/MAl水滑石(M=Zn、Co、Ni)复合物光催化降解亚甲基蓝的性能、动力学与机理  

Photocatalytic Degradation of Methylene Blue by Fe_(3)O_(4)@MAl-Layered Double Hydroxides(M=Zn, Co, Ni) Composite: Performance, Kinetics, and Mechanism

作　　者：倪梯铜 孟跃 青木功荘 姚屹洋 唐浩东[1] 陈爱民[1] 夏盛杰[1] NI Ti‑Tong;MENG Yue;KOSO Aoki;YAO Yi‑Yang;TANG Hao‑Dong;CHEN Ai‑Min;XIA Sheng‑Jie(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Department of Life and Health Sciences,Huzhou College,Huzhou,Zhejiang 313000,China;Zhejiang Huayuan Pigment Co.,Ltd.,Deqing,Zhejiang 310024,China)

机构地区：[1]浙江工业大学化学工程学院,杭州310014 [2]湖州学院生命与健康学院,湖州313000 [3]浙江华源颜料股份有限公司,德清310024

出　　处：《无机化学学报》2022年第9期1759-1770,共12页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21776257);浙江省领军型创新团队项目(No.2018R01008)资助。

摘　　要：基于低成本、无毒害、光吸收性强的四氧化三铁(Fe_(3)O_(4))和大比表面、高稳定性的水滑石(LDHs),制备了Fe_(3)O_(4)@MAl-LDHs(M=Zn、Co、Ni)复合物并用于典型偶氮染料亚甲基蓝的光催化降解。通过X射线粉末衍射(XRD)、紫外可见(UV-Vis)吸收光谱、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及N_(2)吸附-脱附测试表征了复合材料的组成与结构。光催化实验表明,最佳反应条件为催化剂用量50 mg、光照强度500 W、pH=9、反应温度40℃,此时,Fe_(3)O_(4)@MAl-LDHs复合材料对亚甲基蓝的降解率从LDHs的23.2%大幅提升到87.0%。LDHs对亚甲基蓝的降解主要来自·OH,而Fe_(3)O_(4)@CoAl-LDHs光降解活性的贡献主要由·OH和空穴提供。此外,LDHs和Fe_(3)O_(4)@CoAl-LDHs的电化学性质也存在较大差异。Based on low-cost,non-toxic,and strong light absorption ferric oxide(Fe_(3)O_(4))and layered double hydroxides(LDHs)with large specific surface and high stability,Fe_(3)O_(4)@MAl-LDHs(M=Zn,Co,Ni)composites were prepared and used for photocatalytic degradation of methylene blue.The composition and structure of the composites were characterized by X-ray powder diffraction(XRD),UV-Vis absorption spectroscopy,scanning electron microscopy(SEM),transmission electron microscopy(TEM),and N_(2) adsorption-desorption test.The optimum conditions were as follows:the amount of catalyst was 50 mg,the light intensity was 500 W,the pH value was 9,and the reaction temperature was 40℃.The degradation rate of methylene blue increased significantly from 23.2%of LDHs to87.0%of Fe_(3)O_(4)@MAl-LDHs.The degradation of methylene blue by LDHs mainly comes from·OH,while the photodegradation activity of Fe_(3)O_(4)@MAl-LDHs is mainly contributed by both·OH and holes.In addition,there were also great differences in the electrochemical properties of LDHs and Fe_(3)O_(4)@MAl-LDHs.

关 键 词：水滑石 Fe_(3)O_(4) 光降解 亚甲基蓝 反应机理 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]