Visible light active CdS@TiO2 core-shell nanostructures for the photodegradation of chlorophenols

Thuraya Al-Fahdi, Faisal Al Marzouqi, Alex T. Kuvarega, Bhekie B. Mamba, salma al-kindy, Younghun Kim, Rengaraj Selvaraj

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The presence of chlorophenols in various environmental media has become a human health concern. In this study, homogeneous cadmium sulfide (CdS) sub-microspheres were prepared through a solution phase and hydrothermal method, form cadmium acetate dihydrate and thiourea. CdS@TiO2 core-shell nanostructures were synthesized using the as prepared CdS (1:4), through two steps including the solution phase and hydrothermal methods. The prepared CdS sub-microspheres and CdS@TiO2 were characterized using a number of physico-chemical techniques such as X-ray diffraction (XRD), RAMAN spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–vis Diffuse Reflectance Spectroscopy (UV–vis DRS), Scanning Electron Microscopy (SEM), Transmission Electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). The experimental results demonstrated that the morphology of the CdS sub-microspheres can be easily controlled by changing the ratio of cadmium acetate/thiourea. The SEM analysis revealed that the CdS sub-microspheres prepared by solution phase and hydrothermal methods possess an average size of around 149 and 470 nm respectively. The CdS sub-microspheres and CdS@TiO2 core-shell materials were evaluated for the visible light photocatalytic degradation of 2,4-dichlorophenol and 2,4,6-trichlorophenol. CdS@TiO2 showed up to 20% enhanced photocatalytic activity for the degradation of 2,4-DCP and 2,4,6-TCP compared to pure CdS. Up to 70% of 2,4-DCP and 2,4,6-TCP were removed in 6 h. The enhanced photoactivity can be attributed to the longer lifetime of photo-generated electron − hole pairs from the CdS@TiO2 compared to the pure CdS material.

Original languageEnglish
Pages (from-to)75-83
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume374
DOIs
Publication statusPublished - Apr 1 2019

Fingerprint

Chlorophenols
Cadmium sulfide
cadmium sulfides
Photodegradation
Nanostructures
Microspheres
Thiourea
Thioureas
thioureas
cadmium sulfide
Cadmium
cadmium
acetates
Spectroscopy
spectroscopy
degradation
Degradation
Scanning electron microscopy
scanning electron microscopy
x rays

Keywords

  • CdS@TiO
  • Chlorophenol
  • Core-shell structure
  • Photocatalysis
  • Visible light

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

Visible light active CdS@TiO2 core-shell nanostructures for the photodegradation of chlorophenols. / Al-Fahdi, Thuraya; Al Marzouqi, Faisal; Kuvarega, Alex T.; Mamba, Bhekie B.; al-kindy, salma; Kim, Younghun; Selvaraj, Rengaraj.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 374, 01.04.2019, p. 75-83.

Research output: Contribution to journalArticle

Al-Fahdi, Thuraya ; Al Marzouqi, Faisal ; Kuvarega, Alex T. ; Mamba, Bhekie B. ; al-kindy, salma ; Kim, Younghun ; Selvaraj, Rengaraj. / Visible light active CdS@TiO2 core-shell nanostructures for the photodegradation of chlorophenols. In: Journal of Photochemistry and Photobiology A: Chemistry. 2019 ; Vol. 374. pp. 75-83.
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AU - Al-Fahdi, Thuraya

AU - Al Marzouqi, Faisal

AU - Kuvarega, Alex T.

AU - Mamba, Bhekie B.

AU - al-kindy, salma

AU - Kim, Younghun

AU - Selvaraj, Rengaraj

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AB - The presence of chlorophenols in various environmental media has become a human health concern. In this study, homogeneous cadmium sulfide (CdS) sub-microspheres were prepared through a solution phase and hydrothermal method, form cadmium acetate dihydrate and thiourea. CdS@TiO2 core-shell nanostructures were synthesized using the as prepared CdS (1:4), through two steps including the solution phase and hydrothermal methods. The prepared CdS sub-microspheres and CdS@TiO2 were characterized using a number of physico-chemical techniques such as X-ray diffraction (XRD), RAMAN spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–vis Diffuse Reflectance Spectroscopy (UV–vis DRS), Scanning Electron Microscopy (SEM), Transmission Electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). The experimental results demonstrated that the morphology of the CdS sub-microspheres can be easily controlled by changing the ratio of cadmium acetate/thiourea. The SEM analysis revealed that the CdS sub-microspheres prepared by solution phase and hydrothermal methods possess an average size of around 149 and 470 nm respectively. The CdS sub-microspheres and CdS@TiO2 core-shell materials were evaluated for the visible light photocatalytic degradation of 2,4-dichlorophenol and 2,4,6-trichlorophenol. CdS@TiO2 showed up to 20% enhanced photocatalytic activity for the degradation of 2,4-DCP and 2,4,6-TCP compared to pure CdS. Up to 70% of 2,4-DCP and 2,4,6-TCP were removed in 6 h. The enhanced photoactivity can be attributed to the longer lifetime of photo-generated electron − hole pairs from the CdS@TiO2 compared to the pure CdS material.

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KW - Core-shell structure

KW - Photocatalysis

KW - Visible light

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