铁源对碳热合成磁性碳质吸附剂的影响  

Influence of iron precursor in carbothermal synthesis of magnetic carbonaceous adsorbents

作　　者：柯杭 张芳[1] 李广贺[1] 张旭[1] 

机构地区：[1]清华大学环境学院环境模拟与污染控制国家重点联合实验室,北京100084

出　　处：《环境工程学报》2017年第9期4917-4922,共6页Chinese Journal of Environmental Engineering

基　　金：国家高技术研究发展计划(863)项目(2013AA06A207)

摘　　要：评价了不同铁源对碳热法合成磁性碳质吸附剂吸附三氯乙烯的影响。选择3种铁盐作为铁源合成3类磁性碳质吸附剂:氯化铁、硝酸铁和硫酸亚铁。所有吸附剂分别在600、700、800℃条件下以蔗糖为碳源进行合成。对制得的吸附剂使用氮气吸附、扫描电子显微镜、X射线衍射等技术进行表征。3类吸附剂呈现了不同的结构性质、铁组分分布及成分,因此导致对三氯乙烯吸附去除能力有显著差异。通过实验研究了制得的吸附剂对三氯乙烯的吸附动力学,并用准二级动力学模型对数据进行拟合。结果表明氯化铁是用于吸附三氯乙烯的磁性碳质吸附剂合成的最佳铁源。In this work,the influence of the iron precursor for carbothermal synthesis of magnetic carbonaceous adsorbents towards trichloroethylene removal was evaluated. Three iron salts were used to get three kinds of magnetic carbonaceous adsorbents： ferric chloride,ferric nitrate and ferrous sulfate. All adsorbents were prepared at different temperatures of 600,700,800 ℃ using sucrose as carbon source. The characterization of prepared adsorbents was done by different techniques such as nitrogen adsorption,scanning electron microscopy,X-ray diffraction and so on. The three kinds of adsorbents presented different textural properties,iron dispersion and composition,thus leading to quite different abilities of trichloroethylene adsorption. The adsorption kinetics of the prepared adsorbents for trichloroethylene removal was performed and pseudo-second order kinetics equation was used to fit the data. In present study,ferric chloride was the best option of the precursor to synthesize magnetic carbonaceous adsorbents for trichloroethylene removal.

关 键 词：三氯乙烯 吸附 铁源 碳热合成 

分 类 号：X52[环境科学与工程—环境工程]