摘要
采用液相浸渍方法制备3种改性生物炭,采用红外光谱、扫描电镜、比表面积测定仪和元素分析仪等手段表征生物炭表面结构形貌和组成.以头孢噻肟为探针分子,考察改性生物炭对头孢噻肟的吸附性能及吸附影响因素,并探究其吸附机理.结果表明,30min时碱改性生物炭(BC-NaOH)对头孢噻肟的吸附率为83%,符合伪二级动力学方程(R^2>0.99),吸附率显著大于其他几种材料.热力学研究表明,BC-NaOH吸附头孢噻肟是自发放热过程.基于反应热力学及吸附率影响因素分析,得出BC-NaOH吸附头孢噻肟的机理是疏水亲和作用和静电引力.
Three kinds of modified biochar were prepared by liquid impregnation and characterized by Fourier transform infrared spectroscope,scanning electron microscopy,N2 adsorption-desorption isotherm and elemental analyzer.Cefotaxime was selected for examining the adsorption efficiency and mechanisms of the adsorbent.The results showed that alkali modified biochar(BC-NaOH)exhibited more excellent adsorption than other biochar in 30min.The adsorption efficiency of cefotaxime by BC-NaOH was up to 83%and the data fitted the pseudo-second-order kinetic model.Thermodynamic studies showed that the adsorption process was spontaneous and exothermic.On the basis of the results of thermodynamics and adsorption influencing factors,the adsorption mechanisms of cefotaxime by BC-NaOH were hydrophobic affinity and electrostatic attraction.
作者
吴鸿伟
陈萌
黄贤金
苏宗杰
孙泰龙
谭晓燕
冯启言
WU Hong-wei;CHEN Meng;HUANG Xian-jin;SU Zong-jie;SUN Tai-long;TAN Xiao-yan;FENG Qi-yan(Department of Chemistry,Zaozhuang University,Zaozhuang 277160,China;School of Environmental Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;Low Carbon Energy Institute,China University of Mining and Technology,Xuzhou 221116,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第7期2527-2534,共8页
China Environmental Science
基金
国家自然科学基金资助项目(41472223)
国家级大学生创新创业训练计划(201710904059)
关键词
改性生物炭
头孢噻肟
吸附
机理
modified biochar
cefotaxime
adsorption
mechanisms
