Noble metal-coated MoS2 nanofilms with vertically-aligned 2D layers for visible light-driven photocatalytic degradation of emerging water contaminants

Md Ashraful Islam, Jared Church, Changseok Han, Hee Suk Chung, Eunji Ji, Jong Hun Kim, Nitin Choudhary, Gwan Hyoung Lee, Woo Hyoung Lee, Yeonwoong Jung

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Two-dimensional molybdenum disulfide (2D MoS2) presents extraordinary optical, electrical, and chemical properties which are highly tunable by engineering the orientation of constituent 2D layers. 2D MoS2 films with vertically-aligned layers exhibit numerous 2D edge sites which are predicted to offer superior chemical reactivity owing to their enriched dangling bonds. This enhanced chemical reactivity coupled with their tunable band gap energy can render the vertical 2D MoS2 unique opportunities for environmental applications that go beyond the conventional applications of horizontal 2D MoS2 in electronics/opto-electronics. Herein, we report that MoS2 films with vertically-aligned 2D layers exhibit excellent visible light responsive photocatalytic activities for efficiently degrading organic compounds in contaminated water such as harmful algal blooms. We demonstrate the visible light-driven rapid degradation of microcystin-LR, one of the most toxic compounds produced by the algal blooms, and reveal that the degradation efficiency can be significantly improved by incorporating noble metals. This study suggests a high promise of these emerging 2D materials for water treatment, significantly broadening their versatility for a wide range of energy and environmental applications.

Original languageEnglish
Article number14944
JournalScientific reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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Precious metals
Chemical reactivity
Impurities
Degradation
Water
Electronic equipment
Dangling bonds
Poisons
Water treatment
Organic compounds
Chemical properties
Electric properties
Energy gap
Optical properties

All Science Journal Classification (ASJC) codes

  • General

Cite this

Islam, Md Ashraful ; Church, Jared ; Han, Changseok ; Chung, Hee Suk ; Ji, Eunji ; Kim, Jong Hun ; Choudhary, Nitin ; Lee, Gwan Hyoung ; Lee, Woo Hyoung ; Jung, Yeonwoong. / Noble metal-coated MoS2 nanofilms with vertically-aligned 2D layers for visible light-driven photocatalytic degradation of emerging water contaminants. In: Scientific reports. 2017 ; Vol. 7, No. 1.
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Noble metal-coated MoS2 nanofilms with vertically-aligned 2D layers for visible light-driven photocatalytic degradation of emerging water contaminants. / Islam, Md Ashraful; Church, Jared; Han, Changseok; Chung, Hee Suk; Ji, Eunji; Kim, Jong Hun; Choudhary, Nitin; Lee, Gwan Hyoung; Lee, Woo Hyoung; Jung, Yeonwoong.

In: Scientific reports, Vol. 7, No. 1, 14944, 01.12.2017.

Research output: Contribution to journalArticle

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AU - Ji, Eunji

AU - Kim, Jong Hun

AU - Choudhary, Nitin

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AU - Lee, Woo Hyoung

AU - Jung, Yeonwoong

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N2 - Two-dimensional molybdenum disulfide (2D MoS2) presents extraordinary optical, electrical, and chemical properties which are highly tunable by engineering the orientation of constituent 2D layers. 2D MoS2 films with vertically-aligned layers exhibit numerous 2D edge sites which are predicted to offer superior chemical reactivity owing to their enriched dangling bonds. This enhanced chemical reactivity coupled with their tunable band gap energy can render the vertical 2D MoS2 unique opportunities for environmental applications that go beyond the conventional applications of horizontal 2D MoS2 in electronics/opto-electronics. Herein, we report that MoS2 films with vertically-aligned 2D layers exhibit excellent visible light responsive photocatalytic activities for efficiently degrading organic compounds in contaminated water such as harmful algal blooms. We demonstrate the visible light-driven rapid degradation of microcystin-LR, one of the most toxic compounds produced by the algal blooms, and reveal that the degradation efficiency can be significantly improved by incorporating noble metals. This study suggests a high promise of these emerging 2D materials for water treatment, significantly broadening their versatility for a wide range of energy and environmental applications.

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