Evaluation of Chromate Removal Using Layered Double Hydroxides and Their Calcined Products Derived from Blast Furnace Slag
Publication: Journal of Environmental Engineering
Volume 145, Issue 9
Abstract
High-volume blast furnace (BF) slag resulting from iron-making activities has long been considered a burden on the environment. Despite a high number of investigations, aspects of the transformation of BF slag into high value-added products for environmental remediation are still challenging. This work presents a feasible solution toward layered double hydroxides and the formation of its oxide derivatives () by taking advantage of proper cationic composition in BF slag. The adsorption kinetics and isotherms of adsorbents for Cr(VI) removal were investigated in detail. The adsorption kinetic data for layered double hydroxides (S-LDHs) and oxide derivatives (S-LDOs) agreed well with pseudo-second-order kinetic equations. The adsorption activation energies for Cr(VI) adsorption on S-LDHs and S-LDOs were 41.84 and , respectively. Thermodynamic studies demonstrated that the adsorption was a spontaneous and endothermic chemical process, and the better-fitted Langmuir model revealed that the adsorption reaction was monolayer adsorption. S-LDOs exhibited good adsorption capacity (), which could be attributed to more active sites with increased specific surface area and a memory effect after calcination. This paper provides highlights regarding the utilization of metallurgical wastes for environmental remediation.
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Acknowledgments
The National Natural Science Foundation of China (Grant Nos. 51574169, 51604178, 51704202, and 51604202) and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 17KJB450002) are duly acknowledged for their financial support. The authors are also thankful for analysis support from Soochow University.
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Published In
Journal of Environmental Engineering
Volume 145 • Issue 9 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 18, 2018
Accepted: Jan 9, 2019
Published online: Jun 27, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 27, 2019
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