硫酸改性甘草废渣对结晶紫和甲基橙染料的吸附

Adsorption for crystal violet and methyl orange dyes by sulfuric acid modified glycyrrhiza residue

将改性甘草废渣生物吸附剂(SGR)用于对含结晶紫和甲基橙染料模拟废水的吸附。通过扫描电镜、红外光谱和表面官能团的测定对改性前后的甘草废渣进行了表征。结果表明:经硫酸改性后,甘草废渣表面结构发生了变化,表面活性基团的数目也相应增加。根据Langmuir等温方程式计算SGR对结晶紫和甲基橙的饱和吸附量分别为157.60、64.86 mg/g。改性甘草废渣吸附剂对两种染料的吸附符合二级动力学方程。

The biological adsorbent,modified glycyrrhiza residue,has been used for the adsorption for simulated wastewater containing crystal violet and methyl orange dyes. The changes of physical structure and chemical properties of the glycyrrhiza residue before and after modification have been characterized by using a variety of analytical instruments and methods,such as scanning electron microscopy（SEM）,FTIR and surface functional group detections. The results indicate that after being modified with sulfuric acid ,changes occur to the surface structure of glycyrrhiza residue,and the number of surface active groups is increased accordingly. Based on the Langmuir equation calculation,the maximum adsorption capacities of crystal violet and methyl orange by SGR are 157.60 mg/g and 64.86 mg/g,respectively. The adsorption for these two kinds of dyes by using modified glycyrrhiza residue adsorbent complys with pseudo-second order kinetics equation.