溶液介质条件对Fe~(3+)共沉淀去除Cu~(2+)的影响

采用室内试验方法，研究了溶液介质条件对Fe^3 共沉淀去除Cu^2 的影响。试验结果表明，pH是影响Fe^3 共沉淀去除Cu^2 的主要因素之一，其去除率随pH的增加而增加，并且其固液分配系数Kd的对数值与pH之间显示出较好的线性关系；天然水体中溶解的电解质离子及无机和有机配位体对Cu^2 的去除均产生很大影响，Cu^2 的去除率随加入的NaCl和NaClO4浓度的增加而降低，而随Ca(NO3)2和Mg(NO3)2浓度的增加而增加，除磷酸盐的增强作用外，硫酸钠、碳酸氢钠、甘氨酸、草酸钠、柠檬酸钠以及十二烷基苯磺酸钠的加入则不同程度地减弱了Cu^2 的去除；与Cu^2 共存的等量竞争阳离子Pb^2 、Zn^2 和Cd^2 也同样减弱了Fe^3 对Cu^2 的去除。

Influences of Aqueous Medium Conditions on Cu2+ Scavenging by Co-Precipitation with Fe3+

Influences of aqueous medium conditions on Cu2+scavenging by co-precipitation with Fe3+was investigated. The experimental results indicate d that: pH was one of the main factors that controlled Cu2+scavenging, and the scavenging percentage increased with increases of pH values, and the values of pH and logarithm of partition coefficients (Kd) between solid and liquid phase s howed preferable linear relationship; electrolyte ions and in-organic or organ ic ligands dissolved in natural water all played important roles in Cu2+scave nging, and the percentage of Cu2+scavenging decreased with the increasing ad dition of NaCl and NaClO4, while increased with Ca(NO3)2 and Mg(NO3)2 addition. Furthermore, with the exception of phosphate strengthening effect, the addition of sodium sulphate, sodium bicarbonate, glycin, sodium oxalate, sodium citrate a nd LDS weakened Cu2+scavenging in different degree; the presence of equal amou nt of competing cations Pb2+, Zn2+and Cd2+also weakened the scavenging pro cess.