Contribution of Hydroxyapatite and Ferrihydrite in Combined Applications for the Removal of Lead and Antimony from Aqueous Solutions
Contribution of Hydroxyapatite and Ferrihydrite in Combined Applications for the Removal of Lead and Antimony from Aqueous Solutions
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DOI：
10.1007/s11270-014-2023-9
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发表时间：
2014-07-01
影响因子：
2.9
通讯作者：
Sato, Takeshi
中科院分区：
文献类型：
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作者：
Ogawa, Shouhei;Katoh, Masahiko;Sato, Takeshi
本研究通过对铅（Pb）和锑（Sb）的吸附实验，探讨了羟基磷灰石（HAP）和水合铁（FH）单独或联合应用对Pb和Sb的吸附机理，评价了每种材料对Pb和Sb的吸附贡献，并评价了所吸附的Pb和Sb的化学稳定性。Pb吸附等温线和Sb吸附等温线分别符合Langmuir和Freundlich模型。复合处理对Pb和Sb的吸附量与单次处理的吸附量之和相同，说明复合处理对Pb和Sb的吸附没有抑制作用。复合施用中铅主要吸附在HAP上，吸附量占总吸附量的90%。HAP和FH对Sb吸附的贡献分别为吸附Sb总量的32%和68%，即使在联合应用时，每种材料也能独立吸附Sb。在pH值为4和6的条件下，复合处理的吸附材料中Pb和Sb的溶解率与单一处理的溶解率相同。结果表明，在酸性至中性土壤中，复合施用和单一施用均能同时固定Pb和Sb，而在碱性土壤中则不能。
In this study, lead (Pb) and antimony (Sb) sorption experiments were conducted to elucidate the mechanisms of Pb and Sb sorption by combined applications using single or combined applications of hydroxyapatite (HAP) and ferrihydrite (FH), to evaluate the contribution of each material in Pb and Sb sorption, and to assess the chemical stability of the sorbed Pb and Sb. In the combined application, isotherms of Pb sorption and Sb sorption were well fitted to Langmuir and Freundlich isotherm models, respectively. The Pb and Sb amounts sorbed in the combined application were the same levels as the summed totals of those sorbed in the single applications, indicating that in the combined application, Pb sorption and Sb sorption were not suppressed. Pb was mainly sorbed on HAP in the combined application, at a 90% level of the total adsorbed Pb. The HAP and FH contributions to Sb sorption were 32 and 68 % of the total adsorbed Sb, respectively, and Sb was sorbed on each material independently even in the combined application. The percentages of both Pb and Sb dissolved from the sorbed materials in the combined applications at pH 4 and 6 were the same levels as those in the single applications. However, the percentages of Sb dissolved in both combined and single applications were high at an alkaline pH. These results suggest that HAP and FH in a combined application would be useful for simultaneous Pb and Sb immobilization in soil with acidic to neutral pH, but not in soil with an alkaline pH.