用弗雷德盐沉降去除水体中镉的絮凝形态  

Removal of cadmium flocculation morphology in water by sedimentation with Friedel′s salt

作　　者：陆洋 周丽芸 章兴华 雷平 舒海霞 杨鸿波 朱守平 

机构地区：[1]贵州省理化检测分析研究中心,贵州贵阳550002 [2]贵州省环保局 [3]贵州省黔新企业集团有限公司 [4]贵州师大理化测试分析研究中心

出　　处：《无机盐工业》2012年第5期40-43,共4页Inorganic Chemicals Industry

基　　金：贵州省省长专项资金项目([2009]04号);贵州省高层次人才特助经费资助(TZJF[2009]18号)

摘　　要：用微/纳结构的弗雷德盐乳液作吸附-絮凝剂以絮凝法去除水体中重金属镉。结果表明,弗雷德盐絮凝沉降镉的去除率达97.8%。背散射与点能谱的研究表明,弗雷德盐在水处理过程中经历了溶解-再结晶,形成稳定性更高的六方柱形方解石和无定型氢氧化铝。水体中部分镉离子吸附或共沉淀在六方柱形方解石表面;另有部分镉离子吸附或共沉淀在水解生成的无定形氢氧化铝胶体中。XRD谱图比较证实,还有部分镉以类质同象取代方解石中的钙进入晶格。Friedel＇s salt emulsion with micro / nano structure was firstly used as adsorbent-flocculant to remove heavy metal cadmium from wastewater.Resuhs showed the Friedel＇ s salt removal rate of cadmium was as high as 97.8%.Back eletron scattering （BEI） SEM and EDS study proved that Friedel＇s salt experienced a dissolution-recrystallization process in water treatment and formed hexagonal prism-shaped calcite and amorphous aluminum hydroxide.A part of cadmium in the wastewater was absorbed or coprecipitated onto the surface of hexagonal prism-shaped calcite ; another part of cadmium was absorbed or coprecipitated in the amorphous aluminum hydroxide colloid.XRD result showed there was still a small part of cadmium entered into lattices by replacing calcium in the calcite as the form of isomorphism.

关 键 词：弗雷德盐 除镉 溶解-再结晶 类质同象 絮凝形态学 

分 类 号：TQ132.44[化学工程—无机化工]