Staff View: Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling

Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling

The main finding of the work: The adsorption of dye removal using microalgal biochar derived from the wet-torrefaction conversion process is addressed which is conducive to wastewater treatment. © 2020 Elsevier Ltd This study aims to investigate the adsorption behavior of cationic and anionic dye...

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Main Authors:	Yu, Kai Ling, Lee, Xin Jiat, Ong, Hwai Chyuan, Chen, Wei-Hsin, Chang, Jo-Shu, Lin, Chich Sheng, Show, Pau Loke, Ling, Tau Chuan
Format:	Article
Published:	Elsevier 2021
Subjects:	QH Natural history TJ Mechanical engineering and machinery TP Chemical technology
Online Access:	http://eprints.um.edu.my/25898/ https://doi.org/10.1016/j.envpol.2020.115986
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spelling	my.um.eprints.258982021-04-28T04:42:17Z http://eprints.um.edu.my/25898/ Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling Yu, Kai Ling Lee, Xin Jiat Ong, Hwai Chyuan Chen, Wei-Hsin Chang, Jo-Shu Lin, Chich Sheng Show, Pau Loke Ling, Tau Chuan QH Natural history TJ Mechanical engineering and machinery TP Chemical technology The main finding of the work: The adsorption of dye removal using microalgal biochar derived from the wet-torrefaction conversion process is addressed which is conducive to wastewater treatment. © 2020 Elsevier Ltd This study aims to investigate the adsorption behavior of cationic and anionic dyes of methylene blue (MB) and Congo red (CR) onto wet-torrefied Chlorella sp. microalgal biochar respectively, as an approach to generate a waste-derived and low-cost adsorbent. The wet-torrefied microalgal biochar possessed microporous properties with pore diameter less than 2 nm. The optimum adsorbent dosage of wet-torrefied microalgal biochar for MB and CR dyes removal were determined at 1 g/L and 2 g/L, respectively, with their natural pHs as the optimum adsorption pHs. The determined equilibrium contact times for MB and CR were 120 h and 4 h, respectively. Based on the equilibrium modeling, the results revealed that Langmuir isotherm showed the best model fit, based on the highest R2 coefficient, for both the adsorption processes of MB and CR using the wet-torrefied microalgal biochar, indicating that the monolayer adsorption was the dominant process. From the modeling, the maximum adsorption capacities for MB and CR were 113.00 mg/g and 164.35 mg/g, respectively. The kinetic modeling indicated the adsorption rate and mechanism of the dyes adsorption processes, which could be crucial for future modeling and application of wet-torrefied microalgal biochar. From the results, it suggests that the valorization of microalgae by utilizing wet-torrefied microalgal biochar as the effective adsorbent for the removal of toxic dyes with an approach of microalgal biorefinery and value-added application to the environment is feasible. © 2020 Elsevier Ltd Elsevier 2021 Article PeerReviewed Yu, Kai Ling and Lee, Xin Jiat and Ong, Hwai Chyuan and Chen, Wei-Hsin and Chang, Jo-Shu and Lin, Chich Sheng and Show, Pau Loke and Ling, Tau Chuan (2021) Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling. Environmental Pollution, 272. p. 115986. ISSN 0269-7491 https://doi.org/10.1016/j.envpol.2020.115986 doi:10.1016/j.envpol.2020.115986
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	QH Natural history TJ Mechanical engineering and machinery TP Chemical technology
spellingShingle	QH Natural history TJ Mechanical engineering and machinery TP Chemical technology Yu, Kai Ling Lee, Xin Jiat Ong, Hwai Chyuan Chen, Wei-Hsin Chang, Jo-Shu Lin, Chich Sheng Show, Pau Loke Ling, Tau Chuan Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling
description	The main finding of the work: The adsorption of dye removal using microalgal biochar derived from the wet-torrefaction conversion process is addressed which is conducive to wastewater treatment. © 2020 Elsevier Ltd This study aims to investigate the adsorption behavior of cationic and anionic dyes of methylene blue (MB) and Congo red (CR) onto wet-torrefied Chlorella sp. microalgal biochar respectively, as an approach to generate a waste-derived and low-cost adsorbent. The wet-torrefied microalgal biochar possessed microporous properties with pore diameter less than 2 nm. The optimum adsorbent dosage of wet-torrefied microalgal biochar for MB and CR dyes removal were determined at 1 g/L and 2 g/L, respectively, with their natural pHs as the optimum adsorption pHs. The determined equilibrium contact times for MB and CR were 120 h and 4 h, respectively. Based on the equilibrium modeling, the results revealed that Langmuir isotherm showed the best model fit, based on the highest R2 coefficient, for both the adsorption processes of MB and CR using the wet-torrefied microalgal biochar, indicating that the monolayer adsorption was the dominant process. From the modeling, the maximum adsorption capacities for MB and CR were 113.00 mg/g and 164.35 mg/g, respectively. The kinetic modeling indicated the adsorption rate and mechanism of the dyes adsorption processes, which could be crucial for future modeling and application of wet-torrefied microalgal biochar. From the results, it suggests that the valorization of microalgae by utilizing wet-torrefied microalgal biochar as the effective adsorbent for the removal of toxic dyes with an approach of microalgal biorefinery and value-added application to the environment is feasible. © 2020 Elsevier Ltd
format	Article
author	Yu, Kai Ling Lee, Xin Jiat Ong, Hwai Chyuan Chen, Wei-Hsin Chang, Jo-Shu Lin, Chich Sheng Show, Pau Loke Ling, Tau Chuan
author_facet	Yu, Kai Ling Lee, Xin Jiat Ong, Hwai Chyuan Chen, Wei-Hsin Chang, Jo-Shu Lin, Chich Sheng Show, Pau Loke Ling, Tau Chuan
author_sort	Yu, Kai Ling
title	Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling
title_short	Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling
title_full	Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling
title_fullStr	Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling
title_full_unstemmed	Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling
title_sort	adsorptive removal of cationic methylene blue and anionic congo red dyes using wet-torrefied microalgal biochar: equilibrium, kinetic and mechanism modeling
publisher	Elsevier
publishDate	2021
url	http://eprints.um.edu.my/25898/ https://doi.org/10.1016/j.envpol.2020.115986
_version_	1698697321820192768
score	13.211869

Adsorptive removal of cationic methylene blue and anionic Congo red dyes using wet-torrefied microalgal biochar: Equilibrium, kinetic and mechanism modeling

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