In-situ constructing visible light CdS/Cd-MOF photocatalyst with enhanced photodegradation of methylene blue--颗粒学报PARTICUOLOGY

Jing, C., Zhang, Y., Zheng, J., Ge, S., Lin, J., Pan, D., . . . Guo, Z. (2022). In-situ constructing visible light CdS/Cd-MOF photocatalyst with enhanced photodegradation of methylene blue. Particuology, 69, 111-122. https://doi.org/10.1016/j.partic.2021.11.013

In-situ constructing visible light CdS/Cd-MOF photocatalyst with enhanced photodegradation of methylene blue

Cheng Jing ^a, Yufei Zhang ^a, Junjie Zheng ^a, Shengsong Ge^a *, Jing Lin ^b^*, Duo Pan ^{c e}^f, Nithesh Naik ^d, Zhanhu Guo ^e *

a College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China
b School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
c Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450001, China
d Department of Mechanical & Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India
e Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA
f Taiyuan University of Science and Technology, Taiyuan 030024, China

10.1016/j.partic.2021.11.013

Volume 69, October 2022, Pages 111-122

Received 18 April 2021, Revised 5 October 2021, Accepted 4 November 2021, Available online 16 December 2021, Version of Record 28 December 2021.

E-mail: geshengsong@sdust.edu.cn; linjing@gzhu.edu.cn; zguo10@utk.edu

Highlights

• Cd/CdS catalyst was constructed by in-situ sulfurization of partial Cd of Cd-MOF.

• Cd-MOF structure was maintained in the Cd/CdS heterostructure.

• Composite catalyst exhibited good photocatalytic activity.

• Photocatalytic degradation followed the n-n heterojunction-type mechanism.

Abstract

Based on high specific surface area, high porosity of metal-organic frameworks (MOFs) and excellent visible light response of CdS, the CdS/Cd-MOF nanocomposites were constructed by in-situ sulfurization to form CdS using Cd-MOF as precursor and the CdS loading was controlled by the dose of thioacetamide. Under the irradiation of simulated sunlight, the degradation rate of methylene blue (MB) by 10 mg MOF/CdS-6 (mass ratio of MOF to thioacetamide is 6:1) was 91.9% in 100 min, which was higher than that of pure Cd-MOF (62.3%) and pure CdS (67.5%). This is attributed to the larger specific surface area of the composite catalysts, which provides more active sites. Meanwhile, the loading of CdS obviously broadens the light response range of Cd-MOF and improves the utilization of visible light. The Mott-Schottky model experiment shows that the formed type-II heterojunction between Cd-MOF and CdS can effectively inhibit the recombination of photogenerated electrons and holes. Meanwhile, the photocurrent intensity of MOF/CdS-6 is 8 times and 2.5 times of that of pure Cd-MOF and CdS. In addition, MOF/CdS-6 showed good photocatalytic performance after five cycles, showing excellent stability and reusability.

Graphical abstract

Keywords

MOF; CdS; Photocatalytic activity; Visible light; Heterojunction; Dye

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