Effect of HNO_3 treatment on the surface structure of attapulgite and its adsorption property for Hg(II)
Effect of HNO_3 treatment on the surface structure of attapulgite and its adsorption property for Hg(II)
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发表时间：
2005
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通讯作者：
Zhao Yi-jiang
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作者：
Zhao Yi-jiang
本文综述了不同浓度HNO_3对汞的改性及其在含汞废水处理中的应用。考察了硝酸根浓度、吸附剂用量、吸附时间、样品废水pH值等因素对Hg（Ⅱ）离子去除的影响。采用比表面积测试来确定改性机理。结果表明，最佳吸附条件为用4 mol/L HNO 3处理的硅藻土。将改性后的沸石用于含汞废水的处理，其吸附率达到98%。最佳工艺条件为：柠檬酸加量25 g/L，样品pH=3，超声搅拌30 min。比表面积的增加是由于内八面体结构的不对称和不连续溶解，而四面体Si的分段腐蚀导致内孔的张开和扩大。
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.