Heterogeneous photocatalytic degradation of chlorophenols over Ag-TiO 2 nano particles in an aqueous suspension

Selvaraj Rengaraj; Jei Won Yeon; Xiang Zhong Li; Yongju Jung; Won Ho Kim

doi:10.4028/3-908451-31-0.1745

Heterogeneous photocatalytic degradation of chlorophenols over Ag-TiO ₂ nano particles in an aqueous suspension

Selvaraj Rengaraj^*, Jei Won Yeon, Xiang Zhong Li, Yongju Jung, Won Ho Kim

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Citations (Scopus)

Abstract

In the present work, TiO₂ and Ag-TiO₂ catalysts were prepared by an ultrasonic assisted sol-gel method. The physico-chemical characteristics studies of the newly synthesized catalysts were carried out by XRD, TEM, EDX, XPS, UV-Visible absorption spectra and an optical ellipsometry. In order to find out the optical absorption properties of the catalysts, theoretical simulations have been carried out by using the Tauc-Lorentz oscillator model. Photodegradation and mineralisation of the chlorophenols were confirmed by the HPLC and TOC measurements. The rate of a mineralisation trend was observed in the order of P < 2-CP < 2,4-DCP < 2,6-DCP < 4-CP < 2,4,6-TCP by using the Ag-TiO₂ catalyst. The concentration of the main aromatic intermediate products was considerably lower for the Ag-TiO₂ photocatalysts than for pure TiO₂. This experiment demonstrated that the presence of Ag on TiO₂ catalysts could enhance the photocatalytic oxidation of chlorophenols in an aqueous suspension. It was found that the degradation of the chlorphenols by these catalysts followed the pseudo- first order kinetic model.

Original language	English
Title of host publication	Advances in Nanomaterials and Processing - IUMRS - ICA - 2006 International Conference in Asia
Publisher	Trans Tech Publications Ltd
Pages	1745-1748
Number of pages	4
Edition	PART 2
ISBN (Print)	3908451310, 9783908451310
DOIs	https://doi.org/10.4028/3-908451-31-0.1745
Publication status	Published - 2007
Externally published	Yes
Event	IUMRS International Conference in Asia 2006, IUMRS-ICA 2006 - Jeju, Korea, Republic of Duration: Sept 10 2006 → Sept 14 2006

Publication series

Name	Solid State Phenomena
Number	PART 2
Volume	124-126
ISSN (Print)	1012-0394

Other

Other	IUMRS International Conference in Asia 2006, IUMRS-ICA 2006
Country/Territory	Korea, Republic of
City	Jeju
Period	9/10/06 → 9/14/06

Keywords

Ag deposition
Chlorophenols
Photodegradation
Sol-gel
UV light

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

Access to Document

10.4028/3-908451-31-0.1745

Cite this

Rengaraj, S., Yeon, J. W., Li, X. Z., Jung, Y., & Kim, W. H. (2007). Heterogeneous photocatalytic degradation of chlorophenols over Ag-TiO ₂ nano particles in an aqueous suspension. In Advances in Nanomaterials and Processing - IUMRS - ICA - 2006 International Conference in Asia (PART 2 ed., pp. 1745-1748). (Solid State Phenomena; Vol. 124-126, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/3-908451-31-0.1745

Heterogeneous photocatalytic degradation of chlorophenols over Ag-TiO ₂ nano particles in an aqueous suspension. / Rengaraj, Selvaraj; Yeon, Jei Won; Li, Xiang Zhong et al.
Advances in Nanomaterials and Processing - IUMRS - ICA - 2006 International Conference in Asia. PART 2. ed. Trans Tech Publications Ltd, 2007. p. 1745-1748 (Solid State Phenomena; Vol. 124-126, No. PART 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Rengaraj, S, Yeon, JW, Li, XZ, Jung, Y & Kim, WH 2007, Heterogeneous photocatalytic degradation of chlorophenols over Ag-TiO ₂ nano particles in an aqueous suspension. in Advances in Nanomaterials and Processing - IUMRS - ICA - 2006 International Conference in Asia. PART 2 edn, Solid State Phenomena, no. PART 2, vol. 124-126, Trans Tech Publications Ltd, pp. 1745-1748, IUMRS International Conference in Asia 2006, IUMRS-ICA 2006, Jeju, Korea, Republic of, 9/10/06. https://doi.org/10.4028/3-908451-31-0.1745

Rengaraj S, Yeon JW, Li XZ, Jung Y, Kim WH. Heterogeneous photocatalytic degradation of chlorophenols over Ag-TiO ₂ nano particles in an aqueous suspension. In Advances in Nanomaterials and Processing - IUMRS - ICA - 2006 International Conference in Asia. PART 2 ed. Trans Tech Publications Ltd. 2007. p. 1745-1748. (Solid State Phenomena; PART 2). doi: 10.4028/3-908451-31-0.1745

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AB - In the present work, TiO2 and Ag-TiO2 catalysts were prepared by an ultrasonic assisted sol-gel method. The physico-chemical characteristics studies of the newly synthesized catalysts were carried out by XRD, TEM, EDX, XPS, UV-Visible absorption spectra and an optical ellipsometry. In order to find out the optical absorption properties of the catalysts, theoretical simulations have been carried out by using the Tauc-Lorentz oscillator model. Photodegradation and mineralisation of the chlorophenols were confirmed by the HPLC and TOC measurements. The rate of a mineralisation trend was observed in the order of P < 2-CP < 2,4-DCP < 2,6-DCP < 4-CP < 2,4,6-TCP by using the Ag-TiO2 catalyst. The concentration of the main aromatic intermediate products was considerably lower for the Ag-TiO2 photocatalysts than for pure TiO2. This experiment demonstrated that the presence of Ag on TiO2 catalysts could enhance the photocatalytic oxidation of chlorophenols in an aqueous suspension. It was found that the degradation of the chlorphenols by these catalysts followed the pseudo- first order kinetic model.

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