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对NaOH改性向日葵秸杆和棉杆用于水体中孔雀石绿(MG)的去除进行研究,考察了改性吸附剂添加量、溶液pH、吸附时间和温度对其吸附效果的影响,通过动力学和热力学拟合、傅里叶红外光谱仪分析探讨吸附机理。结果表明:改性吸附剂对MG的吸附量较其改性前有明显提高;MG溶液在pH=5~8时有利于吸附,最大去除率可以达到99%以上;改性棉杆吸附剂(MCS)和改性向日葵杆吸附剂(MSS)对MG的吸附过程符合准2级动力学方程;Langmuir等温吸附方程能较好地描述改性吸附剂对MG的吸附特性,最大理论吸附量分别为124.38和48.99mg/g。红外光谱分析,O—H、C—O在吸附过程中发挥了重要作用。
NaOH-modified sunflower straw and cotton stalks were used to remove malachite green (MG) from water. The effects of the amount of modified adsorbent, the pH of the solution, the adsorption time and the temperature on the adsorption were studied. Learning and thermodynamic fitting, Fourier transform infrared spectroscopy analysis of adsorption mechanism. The results showed that the adsorption capacity of modified adsorbent to MG was significantly higher than that of MG before it was modified. The MG solution was favored for adsorption at pH = 5 ~ 8, and the maximum removal rate could reach 99% MCS) and modified sunflower rod adsorbents (MSS) met the pseudo-second order kinetic equation. The Langmuir isotherm equation could well describe the adsorption characteristics of modified adsorbents to MG. The maximum theoretical adsorption capacities were 124.38 and 48.99 mg / g. Infrared spectroscopy, O-H, C-O in the adsorption process has played an important role.