摘要
为了提高活性炭在高湿地区对气态碘的吸附性能,采用十三氟辛基三乙氧基硅烷为疏水改性剂,椰壳活性炭为载体,对活性炭进行疏水改性。首先利用接触角分析仪、扫描电子显微镜(scanning electron microscope,SEM)、比表面积分析、能谱分析(energy dispersive spectroscopy,EDS)等手段表征其结构和疏水性能。然后通过气态碘的吸附实验探究改性活性炭在高湿环境下对气态碘的吸附性能,同时考察了温度、速度对其吸附性能的影响规律。表征结果表面,改性处理后的活性炭对水的静态接触角为152°疏水性良好,扫描电子显微镜、能谱分析均证实活性炭表面覆盖了疏水薄膜且疏水改性对活性炭的孔隙结构影响小。实验结果表明,改性后的活性炭具有良好的选择吸附性。环境湿度的增加对活性炭吸附性能影响较小,随湿度增加活性炭对气态碘的吸附量仅下降了20.02%,而改性前的活性炭吸附量下降了78.26%,改性前后最大吸附系数差值为99.94 mg/g。气流温度、速度和压力对吸附性能产生一定影响,过高的温度和速度会使活性炭的吸附能力下降,压力的增加会使活性炭的吸附能力上升。
In order to improve the adsorption performance of activated carbon to gaseous iodine in high humidity area,use 1H,1H,2H,2H-perfluorooctyltriethoxysilane as hydrophobic modifier and coconut shell activated carbon as the carrier to modify activated carbon hydrophobic.Firstly,contact Angle analyzer,scanning electron microscope(SEM),specific surface area analyzer and energy dispersive spectrum analysis were used to characterize its structure and hydrophobic performance.Then through the adsorption experiment of gaseous iodine,the adsorption performance of modified activated carbon to gaseous iodine in the high humidity environment was explored,and the influence of temperature and velocity on its adsorption performance was investigated.The surface of the modified activated carbon showed a good hydrophobicity with a static contact Angle of 152°.SEM,EDS confirmed that the surface of activated carbon was covered with hydrophobic film and the hydrophobic modification had little influence on the pore structure of activated carbon.The experimental results show that the modified activated carbon has good selective adsorption.The increase of environmental humidity has little influence on the adsorption performance of activated carbon.With the increase of humidity,the adsorption capacity of activated carbon to gaseous iodine only decreased by 20.02%,while the adsorption capacity of activated carbon before modification decreased by 78.26%,and the difference of the maximum adsorption coefficient before modification was 99.94 mg/g.Air flow temperature,speed and pressure have a certain impact on the adsorption performance,too high temperature and speed will make the adsorption capacity of activated carbon decreased,pressure will increase the adsorption capacity of activated carbon.
作者
谢东
查舒卫
张维
窦秀敏
王汉青
XIE Dong;ZHA Shuwei;ZHANG Wei;DOU Xiumin;WANG Hanqing(School of Civil Engineering,University of South China,Hengyang,Hunan 421001,China;National and Local Joint Engineering Center for Building Control Technology,Hengyang,Hunan 421001,China;Yangtze Delta Research Institute(Zhuji),University of South China,Shaoxing,Zhejiang 311800,China;Hangzhou Long Beach New Materials Co.,Ltd.,Shaoxing,Zhejiang 311800,China)
出处
《南华大学学报（自然科学版）》
2021年第3期36-43,82,共9页
Journal of University of South China：Science and Technology
基金
国家自然科学基金重点项目(U1867221)。
关键词
活性炭
疏水改性
吸附能力
气态碘
实验研究
activated carbon
hydrophobic modification
adsorption capacity
gaseous iodine
experiment research
