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Removal of Cd~(2+) from water by Friedel's salt (FS:3CaO·A1_2O_3 ·CaCl_2 ·10H_2O): Sorption characteristics and mechanisms
Juanjuan Zhang; He Zhao; Hongbin Cao; Heping Li; Zhibao Li
2013
Source PublicationJournal of Environmental Sciences
Issue09Pages:1719-1725
AbstractThe development of low-cost and efficient new mineral adsorbents has been a hot topic in recent years. In this study, Friedel's salt (FS:3CaO·A12O3 ·CaCl2 ·10H2O), a hexagonal layered inorganic absorbent, was synthesized to remove Cd2+ from water. The adsorption process was simulated by Langmuir and Freundlich models. The adsorption mechanism was further analyzed with TEM, XRD, FT-IR analysis and monitoring of metal cations released and solution pH variation. The results indicated the adsorbent FS had an outstanding ability for Cd(Ⅱ) adsorption. The maximum adsorption capacity of the FS for Cd(Ⅱ) removal can reach up to 671.14 mg/g. The nearly equal numbers of Cd2+ adsorbed and Ca2+ released demonstrated that ion-exchange (both surface and inner) of the FS for Cd(Ⅱ) played an important role during the adsorption process. Furthermore, the surface of the FS after adsorption was microscopically disintegrated while the inner lamellar structure was almost unchanged. The behavior of Cd(Ⅱ) adsorption by FS was significantly affected by surface reactions. The mechanisms of Cd2+ adsorption by the FS mainly included surface complexation and surface precipitation. In the present study, the adsorption process was fitted better by the Langmuir isotherm model (R2 = 0.9999) than the Freundlich isotherm model (R2 = 0.8122). Finally, due to the high capacity for ion-exchange on the FS surface, FS is a promising layered inorganic adsorbent for the removal of Cd(Ⅱ) from water.
KeywordFriedel’s Salt Cadmium Adsorption Isotherm Mechanism
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/7022
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Juanjuan Zhang,He Zhao,Hongbin Cao,et al. Removal of Cd~(2+) from water by Friedel's salt (FS:3CaO·A1_2O_3 ·CaCl_2 ·10H_2O): Sorption characteristics and mechanisms[J]. Journal of Environmental Sciences,2013(09):1719-1725.
APA Juanjuan Zhang,He Zhao,Hongbin Cao,Heping Li,&Zhibao Li.(2013).Removal of Cd~(2+) from water by Friedel's salt (FS:3CaO·A1_2O_3 ·CaCl_2 ·10H_2O): Sorption characteristics and mechanisms.Journal of Environmental Sciences(09),1719-1725.
MLA Juanjuan Zhang,et al."Removal of Cd~(2+) from water by Friedel's salt (FS:3CaO·A1_2O_3 ·CaCl_2 ·10H_2O): Sorption characteristics and mechanisms".Journal of Environmental Sciences .09(2013):1719-1725.
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