Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study

In this paper, a facile synthesis method for CaFe2O4 is introduced that produces a catalyst capable of significant photocatalytic degradation of POME under visible light irradiation. The co-precipitation method was used to produce two catalysts at calcination temperatures of 550 °C and 700 °C dubbed...

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Main Authors:	Charles, Ashwin, Khan, Maksudur R., Ng, Kim Hoong, Wu, Ta Yeong, Lim, Jun Wei, Wongsakulphasatch, Suwimol, Witoon, Thongthai, Cheng, C. K.
Format:	Article
Language:	English
Published:	Elsevier B.V. 2019
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/24244/ http://umpir.ump.edu.my/id/eprint/24244/ http://umpir.ump.edu.my/id/eprint/24244/ http://umpir.ump.edu.my/id/eprint/24244/1/Facile%20synthesis%20of%20CaFe2O4%20for%20visible%20light%20driven.pdf

id	ump-24244
recordtype	eprints
spelling	ump-242442019-09-04T03:06:09Z http://umpir.ump.edu.my/id/eprint/24244/ Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study Charles, Ashwin Khan, Maksudur R. Ng, Kim Hoong Wu, Ta Yeong Lim, Jun Wei Wongsakulphasatch, Suwimol Witoon, Thongthai Cheng, C. K. TP Chemical technology In this paper, a facile synthesis method for CaFe2O4 is introduced that produces a catalyst capable of significant photocatalytic degradation of POME under visible light irradiation. The co-precipitation method was used to produce two catalysts at calcination temperatures of 550 °C and 700 °C dubbed CP550 and CP700. CP550 demonstrated the maximum COD removal of 69.0% at 0.75 g/L catalyst loading after 8 h of visible light irradiation which dropped to 61.0% after three consecutive cycles. SEM images indicated that the higher calcination temperature of CP700 led to annealing which reduced the pore volume (0.025 cm3/g) and pore diameter (10.3 nm) while simultaneously creating a smoother and more spherical surface with lower SBET (9.73 m2/g). In comparison, CP550 had a rough hair-like surface with higher SBET (27.28 m2/g) and pore volume (0.077 cm3/g) as evidenced by BET analysis. XRD data indicated the presence of CaFe5O7 in the CP550 composition which was not present in CP700. The presence of Wustite-like FeO structures in CaFe5O7 are likely the cause for lower photoluminescence intensity profile and hence better charge separation of CP550 as these structures in CaFe2O4 have been known to increase resistivity and electron localization. The COD removal of CP550 dropped from 69.0% to just 7.0% upon adding a small quantity of isopropanol into the reaction mixture indicating hydroxyl radicals as the primary reactive oxidative species. Elsevier B.V. 2019 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/24244/1/Facile%20synthesis%20of%20CaFe2O4%20for%20visible%20light%20driven.pdf Charles, Ashwin and Khan, Maksudur R. and Ng, Kim Hoong and Wu, Ta Yeong and Lim, Jun Wei and Wongsakulphasatch, Suwimol and Witoon, Thongthai and Cheng, C. K. (2019) Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study. Science of The Total Environment, 661. pp. 522-530. ISSN 0048-9697 https://doi.org/10.1016/j.scitotenv.2019.01.195 https://doi.org/10.1016/j.scitotenv.2019.01.195
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 Charles, Ashwin Khan, Maksudur R. Ng, Kim Hoong Wu, Ta Yeong Lim, Jun Wei Wongsakulphasatch, Suwimol Witoon, Thongthai Cheng, C. K. Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study
description	In this paper, a facile synthesis method for CaFe2O4 is introduced that produces a catalyst capable of significant photocatalytic degradation of POME under visible light irradiation. The co-precipitation method was used to produce two catalysts at calcination temperatures of 550 °C and 700 °C dubbed CP550 and CP700. CP550 demonstrated the maximum COD removal of 69.0% at 0.75 g/L catalyst loading after 8 h of visible light irradiation which dropped to 61.0% after three consecutive cycles. SEM images indicated that the higher calcination temperature of CP700 led to annealing which reduced the pore volume (0.025 cm3/g) and pore diameter (10.3 nm) while simultaneously creating a smoother and more spherical surface with lower SBET (9.73 m2/g). In comparison, CP550 had a rough hair-like surface with higher SBET (27.28 m2/g) and pore volume (0.077 cm3/g) as evidenced by BET analysis. XRD data indicated the presence of CaFe5O7 in the CP550 composition which was not present in CP700. The presence of Wustite-like FeO structures in CaFe5O7 are likely the cause for lower photoluminescence intensity profile and hence better charge separation of CP550 as these structures in CaFe2O4 have been known to increase resistivity and electron localization. The COD removal of CP550 dropped from 69.0% to just 7.0% upon adding a small quantity of isopropanol into the reaction mixture indicating hydroxyl radicals as the primary reactive oxidative species.
format	Article
author	Charles, Ashwin Khan, Maksudur R. Ng, Kim Hoong Wu, Ta Yeong Lim, Jun Wei Wongsakulphasatch, Suwimol Witoon, Thongthai Cheng, C. K.
author_facet	Charles, Ashwin Khan, Maksudur R. Ng, Kim Hoong Wu, Ta Yeong Lim, Jun Wei Wongsakulphasatch, Suwimol Witoon, Thongthai Cheng, C. K.
author_sort	Charles, Ashwin
title	Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study
title_short	Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study
title_full	Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study
title_fullStr	Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study
title_full_unstemmed	Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study
title_sort	facile synthesis of cafe2o4 for visible light driven treatment of polluting palm oil mill effluent: photokinetic and scavenging study
publisher	Elsevier B.V.
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/24244/ http://umpir.ump.edu.my/id/eprint/24244/ http://umpir.ump.edu.my/id/eprint/24244/ http://umpir.ump.edu.my/id/eprint/24244/1/Facile%20synthesis%20of%20CaFe2O4%20for%20visible%20light%20driven.pdf
first_indexed	2023-09-18T22:36:34Z
last_indexed	2023-09-18T22:36:34Z
_version_	1777416635122974720

Facile synthesis of CaFe2O4 for visible light driven treatment of polluting palm oil mill effluent: Photokinetic and scavenging study

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