Facile fabrication of (2D/2D) MoS2@MIL-88(Fe) interface-driven catalyst for efficient degradation of organic pollutants under visible light irradiation

M Govarthanan; R Mythili; Woong Kim; Saleh Alfarraj; Sulaiman Ali Alharbi

doi:10.1016/j.jhazmat.2021.125522

Facile fabrication of (2D/2D) MoS₂@MIL-88(Fe) interface-driven catalyst for efficient degradation of organic pollutants under visible light irradiation

J Hazard Mater. 2021 Jul 15:414:125522. doi: 10.1016/j.jhazmat.2021.125522. Epub 2021 Feb 27.

Authors

M Govarthanan¹, R Mythili², Woong Kim³, Saleh Alfarraj⁴, Sulaiman Ali Alharbi⁵

Affiliations

¹ Department of Environmental Engineering, Kyungpook National University, Daegu, South Korea.
² PG & Research Department of Biotechnology, Mahendra Arts & Science College, Kalippatti, Tamil Nadu, India.
³ Department of Environmental Engineering, Kyungpook National University, Daegu, South Korea. Electronic address: elshine@knu.ac.kr.
⁴ Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
⁵ Department of Botany and Microbiology, College of Science, King Saud University, PO Box-2455, Riyadh 11451, Saudi Arabia.

PMID: 33684820
DOI: 10.1016/j.jhazmat.2021.125522

Abstract

The present investigation describes the photocatalytic degradation of methylene blue (MB) and rhodamine-B (RhB) using molybdenum disulfide (MoS₂) anchored metal-organic frameworks (MOFs) under visible light irradiation. Herein, MIL-88(Fe) was successfully modified with MoS₂ to yield a novel heterogeneous MoS₂@MIL-88(Fe) hybrid composite. The prepared catalyst enhances the superior photocatalytic activity than the pristine form of MoS₂ and MIL-88(Fe) framework. The physico-chemical properties of the prepared catalyst were analytically investigated and the results exhibit greater photocatalytic efficiency towards the chosen dyes, with an optical band gap of 2.75 eV. The MoS₂ and MIL-88(Fe) framework could act as efficient oxidation and reduction sites in the as-synthesized MoS₂@MIL-88(Fe) composite, and generated the non-toxic by-products such as hydroxyl ^(•OH), and superoxide species ^(•O₂^-) for the mineralization of MB and RhB dyes. The degradation kinetics showed that the dye system followed a pseudo-first-order model which is well supported by the Langmuir-Hinshelwood mechanism. Moreover, the reusability studies showed excellent photocatalytic activity after five cycles. Finally, the photocatalytic degradation mechanism of MB and RhB dyes was suggested.

Keywords: Dyes; MIL-88(Fe); MoS(2); Photocatalytic degradation; Visible light.

Publication types

Research Support, Non-U.S. Gov't