改性香蕉皮对六价铬的去除研究

Removal of Chromium(Ⅵ) with Modified Banana Peel

用硝酸和异丙醇改性处理香蕉皮,并在静态条件下探讨了吸附剂用量、吸附时间、pH、温度对废水中Cr(Ⅵ)吸附效果的影响。结果表明,硝酸和异丙醇改性处理的香蕉皮在Cr(Ⅵ)初始浓度为100μg/m L、pH为1.5,吸附时间为90 min、吸附剂用量分别为0.100和0.050 g/L、温度为30℃、转速为200 r/min的条件下能够获得良好的吸附效果,对Cr(Ⅵ)的吸附量分别可达24.198、49.695 mg/g;二者的吸附过程均符合准二级动力学方程。

Banana peels were modified by nitric acid and IPA, respectively,and the effects of p H,reaction time,absorbent amount,temperature and rotational speed of these absorbents on the absorption were studied. The results showed that,when the initial concentration of Cr（Ⅵ） was 100 μg/m L,p H was 1.5,the time was 90 min,adsorbents dosage was 0.100 g/L and 0.050 g/L respectively,temperature was 30 ℃,and stirring speed was 200 r/min, the maximum adsorption mass was reached, and the adsorption capacity of modified banana peel treated by nitric acid and IPA on Cr（Ⅵ） in the solution was 24.198 mg/g and49.695 mg/g respectively. Both of the absorption processes fit with the secondary kinetic equations.