废弃核桃壳粉对模拟微污染水中总铁的静态吸附特性研究

Static absorption of Fe in simulated micro-polluted water by waste walnut shell powder

采用废弃核桃壳粉对总铁质量浓度约为3 mg/L的模拟微污染水进行了静态吸附实验研究。结果表明,采用产地为新疆、粒径为1.6～2.5 mm的废弃核桃壳粉1.0 g、水样初始pH为7.0、吸附时间为240 min时,总铁去除率可以达到92.69%。吸附后,水样中总铁浓度满足《生活饮用水卫生标准》(GB 5749—2006)规定的要求。随着体系温度的升高,废弃核桃壳粉对总铁吸附量增加。同时,对吸附等温线相关参数拟合后表明,Freundlich吸附等温方程能较好地反映吸附过程。

The shell of walnut which grown in Xinjiang was collected as adsorbent to static absorption of Fe in micro-polluted water.The simulated micro-polluted water was prepared with initial Fe concentration was 3 mg/L,and the effect of adsorbent diameter,adsorbent dosage,pH and connecting time on Fe removal was investigated.Results showed that applying 1.0 g of adsorbent（diameter ranged 1.6-2.5 mm） into 100 mL simulated micro-polluted water at pH of 7.0,92.69% of Fe was removed after 240 min.The Fe in treated micro-polluted water could meet the standard of drinking water（GB 5749-2006）.The adsorption capacity of walnut shell powder was increased with increasing the temperature,and the adsorption isotherm was better fitted by Freundlich model than by Langmuir model.