香蕉皮对重金属六价铬吸附性能研究

用香蕉皮作吸附剂,对含有Cr(VI)的模拟重金属废水进行了吸附研究.分别考察了温度、pH、吸附剂粒径、吸附剂量、溶液初始浓度及震荡时间等因素对吸附效果的影响.结果表明,0.1g香蕉皮在pH为2左右、温度30℃、吸附7h、初始浓度为30mg/L的Cr(Ⅵ)溶液,吸附量可达20mg/g.吸附可以用Langmuir等温线很好的描述,且符合准二级动力学方程.热力学数据表明,该吸附反应为吸热过程,且以物理吸附为主.香蕉皮处理含铬废水具有很好的应用前景.

Study on adsorptive property of hexavalent chromium by banana peel

This paper used banana peels as an adsorbent for studying heavy metal Cr（Ⅵ）-containing in waste water. Respectively,the effects of the adsorption dosage, temperature, pH, adsorbent particle size, initial concentration and shock time on adsorption were investigated. The results showed that under the following condition：the dosage was 0.1 g,the pH value of the wastewater was 2,the temperature is 30 ℃, the shoek time was 7 h, the initial mass con- centration of Cr（Ⅵ） was about 30 mg/L,the adsorbing capacity can be 20 mg/g. The ad sorption conforms to the pseudo-secondary dynamics equation. The adsorption reaction is an endothermic proeess and mainly physical adsorption. Using banana peels to treat chromium- contained wastewater has a very good application prospeet.