Combined physical and chemical activation of sludge-based adsorbent enhances Cr(Ⅵ) removal from wastewater

Zhang, L; Pan, J; Liu, L; Song, K; Wang, Q

Combined physical and chemical activation of sludge-based adsorbent enhances Cr(Ⅵ) removal from wastewater

Zhang, L Pan, J Liu, L Song, K Wang, Q

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Publication Type:: Journal Article
Citation:: Journal of Cleaner Production, 2019, 238
Issue Date:: 2019-11-20

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Field	Value	Language
dc.contributor.author	Zhang, L	en_US
dc.contributor.author	Pan, J	en_US
dc.contributor.author	Liu, L	en_US
dc.contributor.author	Song, K	en_US
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331	en_US
dc.date.issued	2019-11-20	en_US
dc.identifier.citation	Journal of Cleaner Production, 2019, 238	en_US
dc.identifier.issn	0959-6526	en_US
dc.identifier.uri	http://hdl.handle.net/10453/136907
dc.description.abstract	© 2019 Elsevier Ltd To enhance the adsorption properties of sludge-based adsorbents (SBAs), the physical activation and the combined physical and chemical activation were examined comparatively. The surface composition and structure of modified SBAs were characterized using BET surface area, XRD and FTIR, the adsorption behavior of modified SBAs was investigated for Cr(Ⅵ) removal from wastewater. For CSU-NaOH, the optimum adsorption time and pH were 0.5 h and 2.5, respectively. The maximum adsorption capacity by CSU-NaOH was 15.3 mg g−1 for Cr(VI) removal, which was over 2 times of those by carbonized sludge and carbonized sludge with urea addition at 25 °C. The adsorption kinetics could be fitted with the pseudo second-order model for three adsorbents, the adsorption isotherm could be fitted with Langmuir model. The thermodynamic analysis indicated that the adsorption process of three adsorbents for Cr(Ⅵ) removal was spontaneous and endothermic. The reusability tests showed that the removal rate of Cr(VI) was kept over 95% by desorbed CSU-NaOH sample until the fifth cycle. The enhancement of adsorption properties can be attributed to both the increase of BET surface area and the improvement of surface functional groups of SBAs. The advantages of higher adsorption capacity and adsorption rate of CSU-NaOH suggest that CSU-NaOH is an effective adsorbent for Cr(Ⅵ) removal.	en_US
dc.relation.ispartof	Journal of Cleaner Production	en_US
dc.relation.isbasedon	10.1016/j.jclepro.2019.117904	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.title	Combined physical and chemical activation of sludge-based adsorbent enhances Cr(Ⅵ) removal from wastewater	en_US
dc.type	Journal Article
utslib.citation.volume	238	en_US
utslib.for	0907 Environmental Engineering	en_US
utslib.for	0910 Manufacturing Engineering	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	238	en_US

Abstract:

© 2019 Elsevier Ltd To enhance the adsorption properties of sludge-based adsorbents (SBAs), the physical activation and the combined physical and chemical activation were examined comparatively. The surface composition and structure of modified SBAs were characterized using BET surface area, XRD and FTIR, the adsorption behavior of modified SBAs was investigated for Cr(Ⅵ) removal from wastewater. For CSU-NaOH, the optimum adsorption time and pH were 0.5 h and 2.5, respectively. The maximum adsorption capacity by CSU-NaOH was 15.3 mg g−1 for Cr(VI) removal, which was over 2 times of those by carbonized sludge and carbonized sludge with urea addition at 25 °C. The adsorption kinetics could be fitted with the pseudo second-order model for three adsorbents, the adsorption isotherm could be fitted with Langmuir model. The thermodynamic analysis indicated that the adsorption process of three adsorbents for Cr(Ⅵ) removal was spontaneous and endothermic. The reusability tests showed that the removal rate of Cr(VI) was kept over 95% by desorbed CSU-NaOH sample until the fifth cycle. The enhancement of adsorption properties can be attributed to both the increase of BET surface area and the improvement of surface functional groups of SBAs. The advantages of higher adsorption capacity and adsorption rate of CSU-NaOH suggest that CSU-NaOH is an effective adsorbent for Cr(Ⅵ) removal.

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http://hdl.handle.net/10453/136907