Sorption hysteresis of Cd(II) and Pb(II) on natural zeolite and bentonite

Journal of Hazardous Materials
Mohsen HamidpourHans Christian Brunn Hansen

Abstract

Sorption hysteresis in natural sorbents has important environmental implications for pollutant transport and bioavailability. We examined sorption reversibility of Cd(II) and Pb(II) on zeolite and bentonite. Sorption isotherms were derived by sorption of Cd(II) and Pb(II) from solutions containing a range of the metal concentrations corresponding to 10-100% maximum sorption capacity (SCmax) of the sorbents. The desorption experiments were performed immediately following the completion of sorption experiments. Sorption and desorption isotherms of Cd(II) and Pb(II) were well described by the Freundlich model. The results revealed that the desorption isotherms of Cd(II) and Pb(II) from zeolite significantly deviated from the sorption isotherms indicating irreversible or very slowly reversible sorption. For bentonite sorption/desorption isotherms were similar indicating reversible sorption. The extent of hysteresis was evaluated from sorption and desorption Freundlich parameters (K(f) and n) through the apparent hysteresis index (HI = n(desorb)/n(sorb); n is the exponent in the Freundlich equation) and differences in Freundlich K(f) parameters. Higher sorption irreversibility was obtained for Pb(II) as compared to Cd(II). The amoun...Continue Reading

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Citations

Jan 15, 2016·Environmental Science and Pollution Research International·Chang ZhangLiu-Qing Shen
Aug 24, 2010·Journal of Hazardous Materials·Shitong YangXianjin Yu
Sep 3, 2016·Advances in Colloid and Interface Science·João P VaredaLuisa Durães
Jan 27, 2018·Environmental Science and Pollution Research International·Nasibeh AminiNourollah Mirghaffari
Aug 20, 2017·Environmental Science and Pollution Research International·Fande MengHailong Wang
Jun 28, 2018·Bulletin of Environmental Contamination and Toxicology·Shiping ShanLiyang Wu
Dec 13, 2018·Frontiers in Pharmacology·Sandra Kraljević PavelićKrešimir Pavelić
Jun 14, 2020·Environmental Science and Pollution Research International·Lirong LiuQihang Wu
Dec 18, 2018·Ecotoxicology and Environmental Safety·Mingyan JiangQibing Chen

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