硼酸-微波改性花生壳对Cd^2+的吸附特性

Adsorption characteristics of Cd^2+by peanut shells modified with boric acid-microwave

采用硼酸-微波二次改性的方法对农业废弃物花生壳进行改性,获得改性生物吸附材料。利用扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)等手段分析了改性花生壳的结构和成分,并研究了不同因素对改性花生壳吸附性能的影响。结果表明,在花生壳投加量为4 g/L,pH为6~7,30℃的条件下,Cd^2+的去除率可以达到97.2%,最大吸附量为21.77 mg/L。通过相关模型对动力学和吸附等温曲线的拟合,证明花生壳对Cd^2+的吸附是单分子层吸附,吸附过程主要受化学吸附的控制。

Peanut shells from agricultural wastes were modified by boric acid-microwave to obtain modified biological adsorption materials.The structure and composition of modified peanut shells were analyzed by SEM and FTIR,and the effects of different factors on the adsorption properties of modified peanut shells were studied.The results showed that under the condition of the dosage was 4 g/L,pH was 6~7,temperature was 30℃,the removal rate could reach 97.2%,the maximum adsorption capacity was 21.77 mg/g.By fitting the kinetics and adsorption isotherm curves with the relevant models,it was proved that the adsorption of Cd^2+on peanut shells was monolayer adsorption,and the adsorption process was mainly controlled by chemical adsorption.