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Highly efficient removal of toxic Pb 2+ from wastewater by an alginate–chitosan hybrid adsorbent
Author(s) -
Wang Zhuqing,
Jin Pengxiang,
Wang Min,
Wu Genhua,
Sun Jiayin,
Zhang Yujie,
Dong Chen,
Wu Aiguo
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5624
Subject(s) - adsorption , chitosan , selectivity , chemistry , elution , wastewater , nuclear chemistry , ion exchange , raw material , chromatography , ion , organic chemistry , waste management , catalysis , engineering
BACKGROUND In this study, a low‐cost and environment‐friendly alginate–chitosan hybrid adsorbent (depicted as Alg‐Chi) was developed for the removal of Pb 2+ from water. RESULTS Experimental results showed that the Alg‐Chi exhibits high selectivity and affinity for Pb 2+ . The selectivity coefficients of the Alg‐Chi for Pb 2+ /Cr 3+ , Pb 2+ /Co 2+ Pb 2+ /Cd 2+ , Pb 2+ /Zn 2+ , and Pb 2+ /Cu 2+ are all >5. It can uptake 96.8% of Pb 2+ from Pb 2+ ‐containing solutions (1.5 mmol L −1 ), and the maximum adsorption capacity for Pb 2+ reaches 468.5 mg g −1 , which is higher than that of most reported adsorbents for Pb 2+ . Moreover, the Alg‐Chi can also be regenerated via simple acid elution and used repeatedly without loss in adsorption ability. CONCLUSIONS Analysis of the adsorption mechanism indicated that the Alg‐Chi adsorbed Pb 2+ mainly through ion exchange and chemical coordination. Green and low‐cost raw materials, simple preparation process, efficient removal efficiency and recyclable, these characteristics give the synthetic Alg‐Chi broad application prospects in the field of Pb 2+ ‐containing wastewater treatment. © 2018 Society of Chemical Industry