| 水合氧化铁去除Cu~(2+)的实验研究 |
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| 引用本文： | 于文辉,刘丛强.水合氧化铁去除Cu~(2+)的实验研究[J].地球与环境,2004(Z1). |
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| 作者姓名： | 于文辉 刘丛强 |
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| 作者单位： | 中国科学院研究生院，中国科学院地球化学研究所环境地球化学国家重点实验室 北京 100039，贵州 贵阳 550002 |
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| 基金项目： | 中国科学院重要方向项目(KZCX3-SW-140,KZCX2-105) |
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| 摘 要： | 研究了实时生成的水合氧化铁(HFO)对Cu2+的去除。研究结果表明:生成的水合氧化铁是棕黄色无定形铁的氧化物,盐滴定方法测得其零电荷点PZC为8.28±0.02;它对Cu2+吸附的动力学特征受控于HFO的生成动力学,其吸附等温线可用Henry公式和类似Langmuir公式的叠加来拟合;随着吸附剂量的增加,它对Cu2的吸附率和吸附量的影响分别呈现出指数形式(Y=aXb)的增加和减少。Cu2+从溶液中去除的可能机理包括表面络合反应、共沉淀、表面沉淀、Cu2+的水解作用、Cu2+的水解产物与水合氧化铁的絮凝作用等。
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| 关 键 词： | HFO 吸附 动力学 吸附等温线 |
AN EXPERIMENTAL STUDY ON SCAVENGING OF Cu~(2+) BY PRECIPITATING HYDROUS FERRIC OXIDES |
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| YU Wen-hui,LIU Cong-qiang.AN EXPERIMENTAL STUDY ON SCAVENGING OF Cu~(2+) BY PRECIPITATING HYDROUS FERRIC OXIDES[J].Earth and Environment,2004(Z1). |
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| Authors: | YU Wen-hui LIU Cong-qiang |
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| Abstract: | The adsorption of copper (Ⅱ) onto coprecipitated hydrous ferric oxide (HFO) was examined in this paper. The results showed that: HFO produced was amorphous hydrous ferric oxide, and the value of F'ZC (point of zero charge) determined by the salt titration method was 8. 28±0. 02. The process that HFO was produced controlled the kinetic characteristics of Cu2+ adsorption onto HFO. The adsorption isotherm can be fitted by combining the equations of Henry and analogous Langmuir. With increasing amount of adsorbent, the percentage of Cu2+ adsorbed and the adsorption capacity increased and reduced respectively by an exponential factor (Y = aXb). The possible mechanism of scavenging of copper from the solution includes surface compl exation, coprecipitation, surface precipitation, copper hydrolysis, copper hydrolysation and flocculation with hydrous ferric oxides. |
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| Keywords: | HFO adsorption kinetic characteristics adsorption isotherm |
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