以废菌渣活性炭(MRAC)为吸附剂,对水中Cr(Ⅵ)进行了连续流固定床的动态吸附研究,选定床层高度、进水流速和进水Cr(Ⅵ)浓度进行了正交试验,并对材料性能进行表征。采用Thomas模型对穿透曲线进行动力学分析,并计算相关参数。研究了HCl、NaOH和NaCl解吸剂对吸附后的MRAC的脱附再生性能,并对MRAC床层进行动态循环再生。结果表明,影响吸附因素的主次顺序为:进水Cr(Ⅵ)浓度>进水流速>床层高度,MRAC固定床柱对Cr(Ⅵ)的最高去除率可达98.32%。Thomas模型能很好地描述MRAC固定床吸附柱对水中Cr(Ⅵ)的动态吸附行为。饱和后的炭床在HCl条件下的再生效果最好,再生3次后MRAC性能恢复率仍在80%以上,能够很好地恢复MRAC的吸附性能,表明MRAC具有良好的吸附-解吸功能。
The dynamic adsorption of Cr(Ⅵ) in water was studied by using mushroom residue activated carbon (MRAC) as adsorbent,the bed height,influent Cr(Ⅵ) concentration and influent flow rate were selected for orthogonal experiment,and the materials were characterized.Thomas models were used to analyze the breakthrough curve and calculated the relevant parameters.The desorption and regeneration of MRAC by HCl,NaOH and NaCl were studied,and the MRAC fixed bed was regenerated dynamically.The results showed that the order of the important factors affecting the adsorption were:influent Cr(Ⅵ) concentration influent flow rate bed height.The highest removal rate of Cr(Ⅵ) by MRAC fixed bed column could reach 98.32%.Thomas model could well describe the dynamic adsorption behavior of Cr(Ⅵ) in water by MRAC fixed bed adsorption column.The regeneration effect of saturated carbon bed was the best under the condition of HCl,after three times of regeneration,the recovery rate of MRAC performance was still over 80%,which could restore the adsorption performance of MRAC well.MRAC could be recycled and reused after regeneration,with good adsorption desorption function.
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