有机溶剂法提纯Al_(13)的方法研究及表征分析  

Purification of Al_(13) by Organic Solvent Method and Characterization

作　　者：喻德忠[1] 蔡浩[1] 

机构地区：[1]武汉工程大学化工与制药学院绿色化学过程省部共建教育部重点实验室,湖北武汉430073

出　　处：《环境科学与技术》2014年第5期5-9,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目资助(51178360)

摘　　要：高纯度且水溶性好的Al13固体特别是具有一定构型的Al13晶体的制备,对于研究Al13的结构、生成和转化机理、絮凝应用等具有重要的意义。分别采用乙醇-二氧六环沉淀法、乙醇-四氢呋喃沉淀法、乙醇-甲基异丁基甲酮沉淀法对微量加碱法制备的聚合氯化铝溶液进行了纯化,并采用Al-Ferron逐时络合比色法、27Al-NMR法和电子扫描显微镜(SEM)对所得到的Al13固体进行了分析表征。结果表明乙醇-二氧六环沉淀法操作最简便,得到的Al13固体纯度最高晶型最规则,Alb含量达到93.5%,Al13含量达到94.6%,呈规则的八面体构型。This paper described a laboratory experiment for purifying of poly-aluminium chloride （PAC） which is one of the commonly-used flocculants for water/wastewater treatment. Three methods were used respectively in the experiment, i.e. ethanol-dioxane precipitation, ethanol-tetrahydrofuran precipitation and ethanol-methylisobutylketone precipitation. The purification using the above methods all ended with Al13 solid which then underwent the characterization by Al-Ferron timed complexation colorimetry, 27Al-NMR spectroscopy and SEM. The experimental results showed that, among the others, the purification method of ethanol-dioxane precipitation was the best, featuring easiness in operation, high purity of crystal Al13 produced with the excellent regularity of octahedral configuration, in which the content of Alb was 93.5% and content of Al13 94.6%.

关 键 词：AL13 纯化 ^27Al—NMR 八面体构型 

分 类 号：X132[环境科学与工程—环境科学]