硫酸改性凹凸棒粘土的性能表征及吸附PbⅡ工艺研究

Characteristics and Application Research of Sulfuric Acid Modified Attapulgite

研究了用不同浓度硫酸改性处理凹凸棒石粘土,并将其用于废水中Pb 的吸附处理,通过比表面测定探讨了凹凸棒粘土硫酸改性后比表面增加的原因.结果表明,4mol/L硫酸改性处理的凹凸棒粘土吸附能力最佳,在改性凹凸棒石粘土加入量为20～30g/L,水样pH=4～6,超声搅拌20min条件下,废水中Pb 的被吸附率接近99%.比表面积的增加归因于凹凸棒石中八面体不均匀、不连续溶解和局部四面体硅的溶蚀导致凹凸棒石孔道开放和直径扩大.

The paper reviewed the modification of attapulgite with H_2SO_4 of different consentration, and its further application in Pb-containing wasted water treatment. The absorption time and pH of sample wasted water which affect the elimination of Pb? ion from the sample were investigated. The specific surface area test were adopted to define the mechanics of modification. Results showed that the optimal absorption condition was the attapulgite been treated in 4mol/L H_2SO_4. The increase of specific surface area attribute to the asymmetry and incontinuity dissolution of inner octahedron structure, and the segmental corrosion of cubic Si induced the unclose and amplify of inner holes. The modified attapulgite been used in Pb-containing wasted water treatment its absoption portion approached 99%. The optimal technological conditions were 20～30?g/L attapulgite addition, sample pH 4～6 and with 20?min supersonic stiring.