炭化小麦秸秆对水中苯胺的吸附性能研究

Study on adsorptive performance of aniline by Carbonized wheat straw

为解决水中苯胺等有毒有机污染物的问题,同时实现农作物秸秆资源化利用,本实验采用炭化小麦秸秆作为吸附剂去除水中的苯胺。考察了炭化小麦秸秆对水中苯胺的表观吸附动力学以及苯胺初始浓度、初始pH值、炭化温度等因素对炭化小麦秸秆吸附苯胺效果的影响,并利用Langmuir和Freundlich吸附等温线模型进行了拟合分析。结果表明:800℃下的炭化小麦秸秆在60 min时的吸附量为7.12 mg.g-1,平均吸附速率为0.119 mg.g-1.min-1;在初始pH为5时,对苯胺的去除率最大;吸附量随着苯胺初始浓度和炭化温度的升高而升高;Freundlich等温吸附模型都能够很好的描述炭化小麦秸秆对苯胺的吸附,800℃下的炭化小麦秸秆对苯胺的极限吸附量约为112.36 mg.g-1,且随着炭化温度的升高,炭化小麦秸秆对苯胺的吸附等温线的非线性程度逐渐增加。

To make wheat straw residue recyclable and remove aniline from water and wastewater,wheat straw was Carbonized and used as an adsorbent. Its adsorption capacity for aniline was systematically examined through batch experiments. The results of experiments indi- cated that Carbonized wheat straw could adsorbed aniline effectively. The wheat straw was Carbonized at 800℃ and it＇s average absorption rate for aniline is 0. 119 mg·g-1 . min-1. The removal rate of aniline is bset when the initial pH of aniline is 5.0. The increase of initial concentration of aniline and the Carbonized temperature resuhe a improve of the adsorption capacity. The adsorption datas fitted the Freundli- ch adsorption isotherm well and the maximum adsorption capacity of Carbonized wheat straw is 112.36 mg· g- 1 when the wheat straw was Carbonized at 800℃. With the increase of the Carbonized temperature, the nonlinear degree of adsorption isotherm is increased gradually.