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《Electroplating & Pollution Control》 2005-04
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A Study of the Characteristics and Adsorption Process of Modified Attapulgite

WANG Hong-yan, ZHAO Yi-jiang, ZHANG Li-li, ZHANG Yan, ZHOU Shou-yong(Department of Chemistry, Huaiyin Normal College, Huaiyin 223001)  
The attapulgite is modified with HNO_3 of different concentrations to prepare the adsorbents for treating Cu containing wastewaters. The effects of nitric acid concentration, attapulgite dose, absorption time, pH value, etc. on the elimination of Cu(Ⅱ) ions through adsorption are investigated. Specific surface area test is adopted to find the causes for increment of specific surface area of the modified attapulgite. The results show that the attapulgite treated in 4 mol/L HNO_3 has the best absorption ability. The adsorption rate of Cu(Ⅱ) in wastewater can be close to 99% with 30 g/L of the modified attapulgite, water sample pH value 4 and 20 min of supersonic stirring. The increase of specific surface area is attributed to asymmetry and uncontinuous dissolution of the inner octahedron structure as well as the local corrosion of tetrahedral Si, which uncloses and enlarges the hole-paths of attapulgite.
【Fund】: 江苏省高校自然科学研究基金资助项目03KJD150052
【CateGory Index】: X703.1
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