Removal of mixed heavy metal ions in wastewater by zeolite 4A and residual products from recycled coal fly ash.

By K. Hui, Christopher Yu Hang Chao, S. Kot. Journal of Hazardous Materials, 2005

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A Short Review on Synthesis, Characterization, and Applications of Zeolites (2021, methodology): “&e ion exchange properties of zeolites are widely used in detergents and treatment of waste and hard water [49, 50].”
The heavy metal adsorption characteristics on metakaolin-based geopolymer (2012, background): “Adsorption reaction occurs due to the exchanges between the surface and the inside positions of the adsorbent (Hui et al., 2005).”
Review of the Natural, Modified, and Synthetic Zeolites for Heavy Metals Removal from Wastewater (2016, positive): “Hui et al. (2005) investigated the removal performance and selectivity sequence of mixed heavy metal ions in aqueous solution by adsorption process on pure and chamfered-edge zeolite 4A, and the afﬁnity order is as follows: Cu 2 + > Cr 3 + > Zn 2 + > Co 2 + > Ni 2 + .”
Study of the adsorption of Cd (II) from aqueous solution using zeolite-based geopolymer, synthesized from coal fly ash; kinetic, isotherm and thermodynamic studies (2015, background): “This implies the assumption of pseudo-second-order model saying that the process of Cd (II) uptake is due to chemisorptions [Hui et al., 2005].”
A Review of the Chemistry, Structure, Properties and Applications of Zeolites (2017, background): “Additionally, these biological processes may not be capable of fully removing toxic metals from these waters [51-53].”