纳米MnO_2负载硅藻土对苯酚废水的吸附性能研究  

Study of adsorption property of nanosized MnO_2/diatomite to phenolic wastewater

作　　者：李哲[1] 汤化伟[1] 王百年[1] 

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2016年第5期695-700,共6页Journal of Hefei University of Technology：Natural Science

摘　　要：文章以乙酸锰和柠檬酸为原料,采用溶胶-凝胶法分别制备了纳米MnO_2和纳米MnO_2负载的硅藻土。采用X-ray衍射(X-射线diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、N2吸附-脱附等对所制备的纳米MnO_2和纳米MnO_2负载硅藻土进行表征。以所制备的纳米MnO_2负载硅藻土为吸附剂,以初始质量浓度为100mg/L的模拟废水中苯酚去除率为主要考察指标,确定了较适宜的吸附工艺条件如下:吸附温度为25℃、吸附时间为100min、体系pH值为2、吸附剂用量为0.6g/L。该条件下的重复实验显示废水中苯酚的平均去除率达85.63%;吸附热力学结果表明,纳米MnO_2负载硅藻土对苯酚废水的吸附等温线符合Langmuir方程,其饱和吸附量为207.039 3mg/g。The nanosized MnO2 and nanosized MnO2/diatomite samples were prepared via sol-gel method using Mn（COOCH3）2 and citric acid. The as-prepared samples were characterized by X-ray diffrac- tion（XRD）, scanning electron microscopy（SEM）, N2 adsorption-desorption. Taking the adsorption property of nanosized MnO2/diatomite to phenol in simulated wastewater with initial concentration of 100 mg/L as the main index, the adsorption conditions were investigated and optimized as follows： the adsorption temperature was 25 ℃, the adsorption time was 100 min, the pH value was 2 and the dose of the adsorbent was 0. 6 g/L respectively. The removal ratio of phenol under the optimized conditions could reach 85.63%. The results of adsorption thermodynamics showed that the adsorption isotherm of the nanosized MnO2/diatomite to phenol could be described by the Langmuir model, and the maximum adsorption capacity was 207. 039 3 mg/g.

关 键 词：硅藻土 纳米MNO2 吸附 苯酚废水 

分 类 号：X52[环境科学与工程—环境工程]