为考察改性国槐叶加入量及其粒径、亚甲基蓝初始质量浓度、pH、吸附温度、吸附时间对吸附率的影响,进行了单因素试验,对筛选出的显著因素采用二次回归正交旋转优化。在改性国槐叶加入量1.2g、吸附时间140min、亚甲基蓝初始质量浓度250mg/L条件下,利用DPS数据处理系统预测的最大吸附率为94.62%,最大吸附率实测值为94.43%,二者吻合。通过吸附等温与吸附动力学分析可知,改性国槐叶对亚甲基蓝的吸附过程是以化学吸附为主的多活性位点吸附,遵循准二级吸附动力学模型。由F检验可知,在1%极显著水平上改性国槐叶的吸附效果优于其他材料,活性炭次之,大孔吸附树脂AB-8较差,硅藻土最差。扫描电子显微镜与X射线能谱分析表明,改性国槐叶具有高度疏松褶皱的结构且含C、O等元素;傅里叶变换红外光谱分析显示其含—OH、CC等基团,利于亚甲基蓝的吸附。改性国槐叶比表面积为133.053m2/g,为脱除亚甲基蓝提供了相对较多的吸附位点。
In order to investigate the effect of the adding amount of modified sophora japonica leaves and its particle size,the initial mass concentration of methylene blue,pH,adsorption temperature and adsorption time on the adsorption rate,a single factor experiment was carried out.The quadratic regression orthogonal rotation optimization was used for selecting the significant factors.Under the condition of the addition of 1.2g,the adsorption time of 140min and the initial mass concentration of methylene blue of 250mg/L,the maximum adsorption rate predicted by DPS data processing system was 94.62%,and the maximum adsorption rate was 94.43%.According to the adsorption isothermal and adsorption kinetics analysis,the adsorption process of methylene blue by the leaves was based on chemisorption-based multi-active site adsorption,which followed the quasi-secondary adsorption kinetics model.The F test showed that the adsorption effect of the leaves was superior to other materials at the extremely significant level of 1%,followed by activated carbon,and the macroporous adsorption resin AB-8 was inferior and the diatomaceous earth was the worst.Scanning electron microscopy and X-ray energy spectrum analysis showed that the leaves had a highly loose and wrinkled structure and contained elements such as C and O.Fourier transform infrared spectroscopy analysis showed that it contained groups such as —OH and CC,which were favorable for the adsorption of methylene blue.The leaves had a specific surface area of 133.053m2/g,which provided relatively more adsorption sites for the removal of methylene blue.
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基金资助
山西省社科联2018年度重点课题研究项目(SSKLZDKT2018120);山西省“1331”工程重点学科项目(098-091704)
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