Adsorption of aqueous Cd2+, Pb2+, Cu2+ ions by nano-hydroxyapatite: Single- and multi-metal competitive adsorption study

文献类型： 外文期刊

第一作者： Chen, S. B.

作者： Chen, S. B.;Ma, Y. B.;Chen, S. B.;Chen, L.;Xian, K.

作者机构：

关键词： nano-hydroxyapatite (nano-HAP);Cd;Pb;Cu;competitive adsorption;selectivity coefficients

期刊名称：GEOCHEMICAL JOURNAL （ 影响因子：1.561； 五年影响因子：1.58 ）

ISSN： 0016-7002

年卷期： 2010 年 44 卷 3 期

页码：

收录情况： SCI

摘要： Being an inexpensive but efficient adsorbent, hydroxyapatite is extensively used for decontaminating wastewater and soils polluted by heavy metals. However, its solubility and grain size can affect its remediation effectiveness. This study investigated the ability of nano-hydroxyapatite (nano-HAP) to adsorb aqueous Cd, Pb and Cu ions from single-metal and multi-metal ions reaction systems. Langmuir and Freundlich isotherm equations were employed to study the sorption constants. Based on the sum of squares errors (SSE), results showed that the Langmuir isotherm better fits sorption data than the Freundlich equation. The sorption affinity of nano-HAP for Pb(II) is always higher than that for Cu(II) and for Cd(II); the sorption maxima for the Cd, Pb and Cu follow the order Pb2+ > Cu2+ > Cd2+. This could be inversely proportional to the hydrated ionic radii as Pb2+ (4.01 angstrom) > Cu2+ (4.19 angstrom) > Cd2+ (4.26 angstrom). The measured selectivity coefficients in multi-metal (Cd-Pb-Cu) reaction systems shows that Pb has the highest sorption selectivity on nano-HAP among the metals investigated. This sorption selectivity coincided well with the sorption affinity order in mono-metal reaction systems. The pH of the solution is an important parameter in controlling Cd, Pb and Cu ions sorption on nano-HAP. Indeed, the nano-HAP sorption capacity increases with increasing pH up to a value of 6.25. This implies that the removal of metals from the solution is recommended for pH 6.25 or below, during remediation using nano-HAP as a sorbent.

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