研究了甘蔗渣粉末对Cr(Ⅵ)的吸附作用,单因素实验研究溶液pH值、甘蔗渣粉末量、吸附时间、温度、Cr(Ⅵ)的初始浓度对吸附率的影响,并通过正交实验优化甘蔗渣粉末对废水中Cr(Ⅵ)的吸附条件。由极差分析可知,在各种影响因素中,pH值的影响最大,其次是吸附温度和甘蔗渣粉末量,吸附时间的影响最小。结果表明,pH值为3．0,甘蔗渣粉末量为1．6g/100mL,吸附时间为150min,吸附温度为20℃,Cr(Ⅵ)的吸附率为88．5%。等温吸附规律可用Freundlich模型较好地描述,吸附过程符合二级动力学模型。%Adsorption of Cr(Ⅵ) by bagasse powder was studied. The effects of pH value,initial Cr(Ⅵ) con-centration,contact time and temperature on adsorption were investigated. The effects of Cr(Ⅵ) initial concentra-tion,adding dosage of bagasse powder,pH value and reaction time on the adsorption rate were studied through the single factor test and the adsorption conditions for Cr (Ⅵ) in wastewater by bagasse powder were optimized through the orthogonal test. The range analysis showed that,among the factors that affected the adsorption effect, the effect of pH value was maximum,followed by the adding dose and contact temperature,the effect of contact time was minimum. The results showed that in the temperature of 20℃, pH = 3. 0 , adsorbent dosage 1. 6 g/100mL,shaking time of 150 minutes,the removal rate of Cr(Ⅵ) can be as high as 88. 5%. The isothermal ad-sorption can be described well by Freundlich. Adsorption kinetics of Cr(Ⅵ) onto bagasse powder obeyed pseudo-second-order equation.
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