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通过羟基磷灰石吸附从单金属和多金属(镉+铅+锌+铜)溶液中去除镉

Cadmium removal from single- and multi-metal (Cd + Pb + Zn + Cu) solutions by sorption on hydroxyapatite.

作者信息

Corami Alessia, Mignardi Silvano, Ferrini Vincenzo

机构信息

Department of Earth Sciences, University of Rome La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy.

出版信息

J Colloid Interface Sci. 2008 Jan 15;317(2):402-8. doi: 10.1016/j.jcis.2007.09.075. Epub 2007 Oct 2.

Abstract

Heavy metal contamination of waters and soils is particularly dangerous to the living organisms. Different studies have demonstrated that hydroxyapatite has a high removal capacity for divalent heavy metal ions in contaminated waters and soils. The removal of Cd from aqueous solutions by hydroxyapatite was investigated in batch conditions at 25+/-2 degrees C. Cadmium was applied both as single- or multi-metal (Cd + Pb + Zn + Cu) systems with initial concentrations from 0 to 8 mmol L(-1). The adsorption capacity of hydroxyapatite in single-metal system ranged from 0.058 to 1.681 mmol of Cd/g of hydroxyapatite. In the multi-metal system competitive metal sorption reduced the removal capacity by 63-83% compared to the single-metal system. The sorption of Cd by hydroxyapatite follows the Langmuir model. Cadmium immobilization occurs through a two-step mechanism: rapid surface complexation followed by partial dissolution of hydroxyapatite and ion exchange with Ca resulting in the formation of a cadmium-containing hydroxyapatite.

摘要

水体和土壤中的重金属污染对生物有机体特别危险。不同研究表明,羟基磷灰石对受污染水体和土壤中的二价重金属离子具有很高的去除能力。在25±2℃的间歇条件下研究了羟基磷灰石从水溶液中去除镉的情况。镉以单金属或多金属(镉+铅+锌+铜)体系形式存在,初始浓度为0至8 mmol L⁻¹。在单金属体系中,羟基磷灰石对镉的吸附容量为0.058至1.681 mmol镉/克羟基磷灰石。在多金属体系中,与单金属体系相比,竞争性金属吸附使去除能力降低了63 - 83%。羟基磷灰石对镉的吸附遵循朗缪尔模型。镉的固定化通过两步机制发生:快速的表面络合,随后是羟基磷灰石的部分溶解以及与钙的离子交换,从而形成含镉的羟基磷灰石。

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