Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies

Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies

The current paper reports on the photo-degradation of palm oil mill effluent over silver-modified titania (Ag/TiO2) under visible light irradiation. TiO2-based photocatalysts with 0.25–5.0 wt% of Ag metal loadings were prepared by impregnating TiO2 with chemically-reduced Ag nanoparticles from the A...

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Main Authors: Ng, Kim Hoong, Lee, Chea Hui, Khan, Maksudur R., Cheng, C. K.
Format: Article
Language:English
Published: Elsevier 2016
Subjects:
TP Chemical technology
Online Access:http://umpir.ump.edu.my/id/eprint/11717/
http://umpir.ump.edu.my/id/eprint/11717/
http://umpir.ump.edu.my/id/eprint/11717/
http://umpir.ump.edu.my/id/eprint/11717/1/fkksa-2016-ck%20cheng-Photocatalytic%20Degradation%20of%20Recalcitrant%20POME.pdf
id ump-11717
recordtype eprints
spelling ump-117172018-01-10T07:07:35Z http://umpir.ump.edu.my/id/eprint/11717/ Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies Ng, Kim Hoong Lee, Chea Hui Khan, Maksudur R. Cheng, C. K. TP Chemical technology The current paper reports on the photo-degradation of palm oil mill effluent over silver-modified titania (Ag/TiO2) under visible light irradiation. TiO2-based photocatalysts with 0.25–5.0 wt% of Ag metal loadings were prepared by impregnating TiO2 with chemically-reduced Ag nanoparticles from the AgNO3 solution. The XRD characterization suggests that anatase was the predominant phase for all the as-synthesized photocatalysts. In addition, UV–Vis DRS confirmed that the Ag inclusion has extended the absorbance of photocatalysts to the visible light region. Moreover, the band gap energy of TiO2 was successively reduced to 2.69 eV (5.0 wt% Ag/TiO2), a drop from 3.1 eV (bare TiO2). Consequently, the POME degradation efficiency jumped 300–15.03% by photoreaction over 1.0 g/L of 0.25 wt% Ag/TiO2 compared to the bare TiO2. The optimum loading of Ag was found to be 0.5 wt%, with corresponding degradation of 19.73%, and can be enhanced further to 26.77% with the optimum catalyst loading of 1.5 g/L. Moreover, scavenging study confirmed that the primary reactive species for POME degradation in the current system was OHradical dot free radicals. In recycling test, the degradation efficiency of 0.5 wt% Ag/TiO2 dropped to 11% and 13% for second and third cycle, respectively, due to leaching of Ag metal as proven by ICP-MS, post-reaction. Elsevier 2016 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/11717/1/fkksa-2016-ck%20cheng-Photocatalytic%20Degradation%20of%20Recalcitrant%20POME.pdf Ng, Kim Hoong and Lee, Chea Hui and Khan, Maksudur R. and Cheng, C. K. (2016) Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies. Chemical Engineering Journal, 286. pp. 282-290. ISSN 1385-8947 http://dx.doi.org/10.1016/j.cej.2015.10.072 DOI: 10.1016/j.cej.2015.10.072
repository_type Digital Repository
institution_category Local University
institution Universiti Malaysia Pahang
building UMP Institutional Repository
collection Online Access
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Ng, Kim Hoong
Lee, Chea Hui
Khan, Maksudur R.
Cheng, C. K.
Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies
description The current paper reports on the photo-degradation of palm oil mill effluent over silver-modified titania (Ag/TiO2) under visible light irradiation. TiO2-based photocatalysts with 0.25–5.0 wt% of Ag metal loadings were prepared by impregnating TiO2 with chemically-reduced Ag nanoparticles from the AgNO3 solution. The XRD characterization suggests that anatase was the predominant phase for all the as-synthesized photocatalysts. In addition, UV–Vis DRS confirmed that the Ag inclusion has extended the absorbance of photocatalysts to the visible light region. Moreover, the band gap energy of TiO2 was successively reduced to 2.69 eV (5.0 wt% Ag/TiO2), a drop from 3.1 eV (bare TiO2). Consequently, the POME degradation efficiency jumped 300–15.03% by photoreaction over 1.0 g/L of 0.25 wt% Ag/TiO2 compared to the bare TiO2. The optimum loading of Ag was found to be 0.5 wt%, with corresponding degradation of 19.73%, and can be enhanced further to 26.77% with the optimum catalyst loading of 1.5 g/L. Moreover, scavenging study confirmed that the primary reactive species for POME degradation in the current system was OHradical dot free radicals. In recycling test, the degradation efficiency of 0.5 wt% Ag/TiO2 dropped to 11% and 13% for second and third cycle, respectively, due to leaching of Ag metal as proven by ICP-MS, post-reaction.
format Article
author Ng, Kim Hoong
Lee, Chea Hui
Khan, Maksudur R.
Cheng, C. K.
author_facet Ng, Kim Hoong
Lee, Chea Hui
Khan, Maksudur R.
Cheng, C. K.
author_sort Ng, Kim Hoong
title Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies
title_short Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies
title_full Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies
title_fullStr Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies
title_full_unstemmed Photocatalytic Degradation of Recalcitrant POME Waste by using Silver Doped Titania: Photokinetics and Scavenging Studies
title_sort photocatalytic degradation of recalcitrant pome waste by using silver doped titania: photokinetics and scavenging studies
publisher Elsevier
publishDate 2016
url http://umpir.ump.edu.my/id/eprint/11717/
http://umpir.ump.edu.my/id/eprint/11717/
http://umpir.ump.edu.my/id/eprint/11717/
http://umpir.ump.edu.my/id/eprint/11717/1/fkksa-2016-ck%20cheng-Photocatalytic%20Degradation%20of%20Recalcitrant%20POME.pdf
first_indexed 2023-09-18T22:12:40Z
last_indexed 2023-09-18T22:12:40Z
_version_ 1777415131012005888

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