纳米级氧化铝的制备及其对铬的形态分析  

Preparation of nanometer-sized aluminum oxide and its speciation analysis of chromium

作　　者：喻德忠[1] 汪国庆[1] 艾军[1] 

机构地区：[1]武汉工程大学化工与制药学院绿色化工过程省部共建教育部重点实验室,湖北武汉430074

出　　处：《武汉工程大学学报》2012年第1期10-13,共4页Journal of Wuhan Institute of Technology

摘　　要：采用溶胶-凝胶法制备了纳米Al2O3,研究其对Cr(Ⅵ)和Cr(Ⅲ)的吸附,探讨了pH值、吸附时间、吸附体积和纳米Al2O3用量对吸附效果的影响,同时探讨了洗脱条件.结果表明:纳米Al2O3在pH=3.6对Cr(Ⅵ)的吸附率达到95%以上,在pH=9.1时对Cr(Ⅲ)的吸附率达到95%以上,分别以2 mol/L NaOH溶液为Cr(Ⅵ)的洗脱剂,2 mol/L HAc溶液为Cr(Ⅲ)的洗脱剂,在沸水浴中加热可完全洗脱纳米Al2O3所吸附的Cr(Ⅵ)和Cr(Ⅲ),试用于样品分析,结果满意.此研究对痕量铬的形态分离、富集及分析有较高的应用价值.Nanometer-sized aluminum oxide was prepared by Sol-Gel process and investigated the adsorption characteristics of Cr （Ⅲ） and Cr （Ⅵ）. Parameters affecting adsorption including, pH, adsorption time, adsorption volume and the quantity of nano-alumina particles, were evaluated in details. Meanwhile, the elution conditions had also been investigated. Results of experiments indicated that the adsorption rate of Cr （ Ⅵ ） and Cr （ Ⅲ） on ultrafine alumina particles was up to 95 % when the adsorption pH was 9.1 and 3.6 respectively. By employing 2 mol/L NaOH and 2 mol/L HAc as the eluant in boiling water bath, the Cr （ Ⅵ ） and Cr （ Ⅲ） ions adsorbed on uhrafine alumina particles could be washed up completely. The study has high value for chemical separation and recoveries of chromium.

关 键 词：纳米AL2O3 铬 分离富集 吸附 

分 类 号：X592[环境科学与工程—环境工程]