摘要
采用不同浓度硝酸活化改性凹凸棒石粘土(简称凹土)制备含Hg废水处理吸附剂,研究了硝酸浓度、改性凹土用量、吸附时间、pH等对改性凹土吸附去除Hg2+效果的影响,并通过比表面测定探讨了凹土改性后比表面增加的原因。结果表明:经4mol/LHNO3改性处理后的凹土吸附能力最好,凹土加入量为25g/L,水样pH=3,超声搅拌30min条件下,废水中Hg(II)的吸附率接近98%;比表面积增加归因于凹土中八面体不均匀、不连续溶解和局部四面体硅的溶蚀导致凹土孔道开放和直径扩大。
The paper reviewed the modification of attapulgite with HNO_3 of different concentration, and its further application in Hg-containing waste water treatment. The concentration of nitric, dose of attapulgite, adsorption time and pH of sample waste water which affect the elimination of Hg(Ⅱ) ion from the sample were investigated. The specific surface area test were adopted to define the mechanics of modification. Results showed that the optimal adsorption condition was the attapulgite been treated with 4 mol/L HNO_3. The modified attapulgite been used in Hg-containing waste water treatment its adsoption portion approached 98%. The optimal technological conditions were 25 g/L attapulgite addition, sample pH=3 and with 30 min supersonic stiring. The increase of specific surface area attribute to the asymmetry and incontinuity dissolution of inner octahedral structure, and the segmental corrosion of tetrahedral Si induced the unclose and amplify of inner holes.
出处
《应用化工》
CAS
CSCD
2005年第2期94-96,共3页
Applied Chemical Industry
基金
江苏省高校自然科学研究基金资助项目(03KJD150052)
关键词
凹土
含汞废水
吸附剂
改性
attapulgite
Hg-containing waste water
adsorbent
modification
