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活性炭对水中微量酰胺咪嗪吸附规律
  • ISSN号:1673-9108
  • 期刊名称:《环境工程学报》
  • 时间:0
  • 分类:TU991.25[建筑科学—市政工程]
  • 作者机构:[1]北京林业大学北京水体污染源控制技术重点实验室,北京100083
  • 相关基金:教育部博士点新教师基金(20090014120018); 教育部新世纪优秀人才项目(NCEF-08-0732)
中文摘要:

选择3种商品活性炭(煤质炭MAC、杏壳炭XAC、椰壳炭YAC),从其对水中微量药物酰胺咪嗪(carbamaz-epine,CBZ)的吸附平衡、吸附等温式、吸附动力学和热力学等方面详细考察了不同种类活性炭对CBZ的吸附去除规律。实验结果表明,3种活性炭与CBZ接触反应10 h后均达到吸附平衡,对CBZ的平衡吸附量在8.3 mg/g左右;比较了Lang-muir和Freundlich两种吸附等温式,发现Langmuir方程更适合描述3种活性炭对CBZ的吸附过程;计算表明3种活性炭的吸附过程均符合拟二级动力学方程,Weber-Morris方程的模拟结果则说明膜扩散和内扩散共同限制了3种活性炭对CBZ的吸附速率;3种活性炭的Ea值分别为29.87 kJ/mol(MAC)、36.02 kJ/mol(XAC)和38.86 kJ/mol(YAC),表明3种活性炭吸附CBZ时同时发生了物理吸附和化学吸附作用,且以化学吸附为主;20~40℃时3种活性炭的△G均为负值,说明3种活性炭对CBZ的吸附反应可以自发进行;MAC、XAC、YAC的△H值分别为-3.10、-3.05和-3.02 kJ/mol,负值表明吸附过程放热,上述△H值较小则说明温度对CBZ的吸附影响不大;3种活性炭吸附CBZ过程的△S值为0.94 J/(mol.K)(MAC)、2.24 J/(mol.K)(XAC)和2.97 J/(mol.K)(YAC),说明吸附过程熵值增加,在外界条件不改变的情况下该吸附过程不可逆,同时可以看出在3种活性炭中,CBZ分子更倾向于吸附在YAC上。

英文摘要:

The removal of trace carbamazepine(CBZ) in water by absorption of three kinds of commercial activated carbon(coal carbon MAC、apricot carbon XAC and coconut carbon YAC) was studied using the adsorption equilibrium,adsorption isotherm,adsorption kinetics and thermodynamics.The results showed that the adsorption equilibrium of each ACs was obtained after about 10 hours.Similar adsorption quantities of CBZ were achieved about 8.3 mg/g.Langmuir adsorption isotherm equation was more suitable to describe the adsorption process compared with Freundlich equation.It was shown that the pseudo second-order kinetic equation could describe the adsorption kinetics for CBZ onto the three ACs,while the boundary layer diffusion and intra particle diffusion are rate limiting.The activation energy(Ea) values of three ACs were 29.87 kJ/mol(MAC),36.02 kJ/mol(XAC),38.86 kJ/mol(YAC),indicating the common effect of physical and chemical adsorption and do minance of the latter.Furthermore,the negative values of △G at 20~40℃ suggested that the adsorptions were spontaneous;the △H values of MAC,XAC and YAC were-3.10,-3.05,-3.02 kJ/mol,respectively,which indicated exothermic character of the adsorption processes and weak influence of temperature;the values of △S were 0.94 J/(mol·K)(MAC),2.24 J/(mol·K)(XAC),2.97 J/(mol·K)(YAC),meaning the process was irreversible under the given environmental conditions.

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期刊信息
  • 《环境工程学报》
  • 中国科技核心期刊
  • 主管单位:中国科学院
  • 主办单位:中国科学院生态环境研究中心
  • 主编:曲久辉
  • 地址:北京东黄城根北街16号
  • 邮编:100017
  • 邮箱:
  • 电话:010-62941074
  • 国际标准刊号:ISSN:1673-9108
  • 国内统一刊号:ISSN:11-5591/X
  • 邮发代号:82-448
  • 获奖情况:
  • 国内外数据库收录:
  • 美国化学文摘(网络版),荷兰文摘与引文数据库,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),英国英国皇家化学学会文摘
  • 被引量:20083