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采用稻壳作为吸附剂,对含有结晶紫染料的废水进行吸附研究,考察了室温条件下初始溶液p H值、吸附时间、溶液初始浓度和吸附剂用量等因素对吸附效果的影响,用扫描电镜(SEM)表征了稻壳的微观形貌,借助吸附动力学、吸附等温线方程,结合红外光谱(FTIR)、BET测试结果分析了稻壳对结晶紫的吸附机理.结果表明:室温条件下稻壳对结晶紫的吸附80min可达平衡,p H为6时,稻壳对结晶紫有最高脱色率达96.6%;吸附过程能够很好地符合准二级动力学方程,较好符合Langmiur和Freundlich等温线方程,理论饱和吸附量可达5.4083 mg·g-1;SEM照片表明在吸附之后,稻壳表面形成了结晶紫的沉积物;红外光谱表明在稻壳对结晶紫的吸附中,—OH,CO,Si—O—Si等基团发挥了重要作用.
Adopting rice husk as adsorbent, the adsorption of wastewater containing crystal violet dye was studied. The effects of initial pH value, adsorption time, initial concentration of solution and adsorbent dosage on the adsorption performance were investigated under room temperature. (SEM) was used to characterize the morphology of rice husks. The adsorption mechanism of rice husks on crystal violet was analyzed by means of adsorption kinetics, adsorption isotherm equation, FTIR and BET test results. The results showed that under the condition of room temperature, The adsorption of crystal violet on the shell reached equilibrium in 80 minutes. The maximum decolorization rate of crystal violet on the rice husk was 96.6% when p H was 6, and the adsorption process was in good agreement with the quasi-second-order kinetic equation, which was in good agreement with Langmiur and Freundlich The theoretical saturated adsorption capacity was 5.4083 mg · g-1. The SEM images showed that the crystal violet was formed on the surface of the rice husk after the adsorption. The infrared spectra showed that -OH , CO, Si-O-Si and other groups played an important role.