原位合成层状双氢氧化物去除水溶液中重金属氰化物络合物(英文)  

REMOVING CYANIDE AND HEAVY METAL COMPLEXES FROM AQUEOUS SOLUTION BY IN SITU LAYERED DOUBLE HYDROXIDES SYNTHESIS

作　　者：陈天虎[1] 刘景丽[1] 谢晶晶[1] 谢巧勤[1] 王健[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《硅酸盐学报》2007年第9期1232-1236,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(40472026)资助项目。

摘　　要：以铁氰络合物作为重金属氰化物络合物替代物,通过在含 Fe(CN)_6^(3-) 水溶液中加入 Mg^(2+),Al^(3+),研究了原位合成层状双氢氧化物(layered double hydroxide,LDH)去除废水中重金属氰化物络合物的可行性。详细探讨了 pH 值、反应时间、摩尔比 n(Mg2+)/n(Al3+)和 Fe(CN) 36? 初始浓度对 Fe(CN) 36? 去除率的影响,结合 X 射线衍射探讨了去除机理。结果表明:利用原位合成 LDH 处理废水中重金属氰化物络合物是可行的。实验条件下,影响去除率的最主要的因素是 pH 值,在 pH=9.5 时达到最佳效果。通过 X 射线衍射谱可知:所得固体为 LDH, Fe(CN)_6^(3-) 是嵌入到 LDH 层间被去除的。The possibility of removing cyanide and heavy metal complexes from wastewater by synthesizing an Mg/A1 layer double hydroxide （LDH） in situ was studied with Fe（CN）^3-6 as a proxy of cyanide and heavy metal complexes. The effects of the pH value, reaction time, Mg^2＋/A1^3＋ molar ratio and initial concentration of Fe（CN）^3-6 on the removal efficiency of Fe（CN）^3-6 in wastewater and the removal mechanism were studied by X-ray diffraction （XRD）. The results show that removing cyanide and heavy metal complexes is feasible by synthesizing LDH in situ. The key factor influencing the removal of Fe（CN）^3-6 is the pH value, and the maximum Fe（CN）^3-6 was removed when the pH value was 9.5. The precipitate of the sample was analyzed by XRD. The results show that the precipitation analyzed by XRD is LDH. This indicates that the Fe（CN）^3-6 is intercalated into the structure of the LDH layers.

关 键 词：层状双氢氧化物 重金属氰化物络合物 原位合成 

分 类 号：X781.1[环境科学与工程—环境工程]