Facile synthesis of In2S3/UiO-66 composite with enhanced adsorption performance and photocatalytic activity for the removal of tetracycline under visible light irradiation

光催化 吸附 X射线光电子能谱 扫描电子显微镜 透射电子显微镜 复合数 化学工程 核化学 材料科学 四环素 电子顺磁共振 漫反射红外傅里叶变换 复合材料 化学 辐照 纳米技术 有机化学 催化作用 核磁共振 工程类 物理 核物理学 生物化学 抗生素
作者
Wenbo Dong,Dongbo Wang,Hou Wang,Mengke Li,Fei Chen,Feiyue Jia,Qi Yang,Xiaoming Li,Xingzhong Yuan,Jilai Gong,Hailong Li,Jun Ye
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:535: 444-457 被引量:139
标识
DOI:10.1016/j.jcis.2018.10.008
摘要

In this study, a series of In2S3/UiO-66 composites were fabricated through a one-step solvothermal method for the first time. The diffraction peaks, composition, morphology, and chemical states of the composites were first characterized through X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, or transmission electron microscope. Then, the performances of as-obtained In2S3/UiO-66 composites were assessed by the removal of tetracycline under 1 h dark condition and 1 h visible-light irradiation. Experimental results showed that all the In2S3/UiO-66 composites exhibited greater tetracycline removal, as compared with the two parent materials (i.e., UiO-66 and In2S3). The highest tetracycline removal was obtained by the developed In2S3/UiO-66 composite with Zr: In molar ratio of (0.37:1), labelled as ISUO-0.37, with the maximal tetracycline removal capacity of 106.3 mg/g being achieved, which was greater than that of UiO-66, In2S3, or other photocatalysts documented in the literature. The mechanism investigations revealed that compared with UiO-66 and In2S3, ISUO-0.37 had higher adsorption capability and photocatalytic performance. Although the specific surface area of ISUO-0.37 (74.57 m2/g) was lower than that of either UiO-66 (388.6 m2/g) or In2S3 (76.36 m2/g), the former possessed greater pore diameter and adsorption sites such as OH, CO, OCO, CC, and CH, which might be the reason for ISUO-0.37 showing the enhanced adsorption capability. The trapping experiment and electron spin resonance measurements demonstrated that O2- and h+ were the major contributors to the photo-degradation of tetracycline in this work, and more O2- and h+ were produced by ISUO-0.37, as compared with In2S3. Further investigation with the diffused spectra of reflectance showed that ISUO-0.37 had better visible light absorption than either In2S3 or UiO-66, which may be the reason for ISUO-0.37 producing more O2-. In addition, photoluminescence emission spectra confirmed that the recombination rate of photoexcited electron-hole pairs of ISUO-0.37 composite is much lower than that of In2S3, which may increase h+. It was also found that ISUO-0.37 showed excellent structural stability and recyclability.
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