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《Materials Protection》 2006-02
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Study of Adsorption of Cr(Ⅵ)-Containing Wastewater by Organobentonite

YANG Ming-ping,FU Yong-jian(School of Chemistry and Chemical Engineering,Hunan University of Science & Technology,Xiangtan 411201,China)  
Crude bentonite was organically modified using hexadecyltri-methylammonium bromide (CTMAB).The resulting modified organobentonite was used to adsorb Cr(Ⅵ)-containing wastewater under static conditions.The effects of the concentration of CTMAB,organobentonite dosage,pH value of wastewater,and stirring time on the removal rate of Cr(Ⅵ) ions were studied,while the optimized processing conditions for the treatment of Cr(Ⅵ)-containing wastewater by organobentonite were determined.Results showed that the modified organobentonite was capable of effectively adsorbing and removing Cr(Ⅵ) in the wastewater.The optimum technological conditions were suggested as pH value of wastewater 3.0 to 5.0,stirring time about 30 min,and organobentonite dosage 10 g/L.Moreover,it was feasible to remove the Cr(Ⅵ) ions in the wastewater containing about 35 mg/L Cr(Ⅵ) at a removal rate over 98.0%,using the optimized processing conditions.And the content of Cr(Ⅵ) ions in the resulting treated wastewater was less than 0.50 mg/L,qualified in terms of the relevant national discharge standard.
【CateGory Index】: X781.1
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