柠檬酸改性汉麻对铅的吸附性能研究

Adsorption Capacity of China-hemp Modified by Citric Acid on Pb

以柠檬酸改性汉麻做为吸附剂，通过测定pH值、吸附时间、Pb2＋初始浓度研究柠檬酸改性汉麻对重金属离子Pb2＋的吸附性能，并通过傅里叶红外光谱仪（FTIR）和模型拟合分析，探讨汉麻纤维对Pb2＋的吸附特性与吸附机理。研究结果表明：柠檬酸改性是一种能有效提高汉麻 Pb2＋的吸附性能的改性方法；在酸性条件下（pH＝5．5）、溶液初始浓度为0．12 g／L、吸附时间为30 min时，柠檬酸改性汉麻纤维对Pb2＋的吸附效果最佳；吸附过程介于Langmuir和Freundlich吸附等温模型之间，准一级和准二级动力学模型均可描述该吸附过程。

The adsorption property of China‐hemp modified by citric acid on heavy metal ions Pb2＋ was investigated by taking China‐hemp modified by citric acid as the adsorbent and measuring pH ,absorption time and initial concentration of Pb2＋ .The adsorption characteristics and mechanism of China‐hemp fibers on Pb2＋ were discussed by FTIR and model fitting analysis .The results indicate that the citric acid could enhance adsorption property of Pb2＋ effectively .The adsorption characteristics of China‐hemp modified by citric acid on Pb2＋ is the best under such conditions ：pH 5 .5 , initial Pb2＋ concentration 0 .12 g/L , adsorption time 30 min .In addition ,the adsorption process is between Langmuir and Freundlich isotherm models .Both quasi‐first‐level and quasi‐second‐level kinetic model could describe the adsorption process .