摘要
通过研究水溶液中椰壳活性炭对甲磺酸培氟沙星(PFLX)的吸附及缓释性能,对比不同温度下的吸附等温线,用Langmuir及Freundlich方程对吸附自由能、焓、熵进行计算。结果表明:活性炭对甲磺酸培氟沙星的吸附符合Freundlich方程,测得ΔH=6.405 9 k J/mol,说明活性炭对PFLX的吸附过程为吸热过程;且ΔH<20 k J/mol,表明吸附过程为物理吸附;同时测得吉布斯自由能ΔG<0,表明吸附质从溶液到吸附剂表面的吸附过程是自发过程,其吸附主要是熵驱动。硝酸氧化改性制备的活性炭较椰壳活性炭的缓释性能有较大的改变,不同活性炭对PFLX的缓释均符合Higuchi方程释药模式。
The effect of activated carbon made from coconut shell on adsorption and controlled release o pe- floxacin mesylate （PFLX） in aqueous solution was studied. The adsorption isotherms had been measured at d fer- ent temperatures. The adsorptive free energy, enthalpy and entropy in adsorption processes had been calculat 1 by the Langmuir and Freundlich equation. The result showed that adsorption of PFLX was in accord with Freundli h e- quation. The heat of absorption AH was 6. 405 9 k J/tool, which demonstrated that the absorption was an en＆! her- mic process, when AH 〈 20 kJ/tool, it indicated that the adsorption process was mostly physical adsorption. ~ ~an- while, Gibbs free energy AG 〈 0,which indicated that the adsorption was a spontaneous process. The results ndi- cated that the value of AS was positive and it＇s the main driving force of adsorption. Modified activated carb n of nitrate oxidization possessed had more controlled release capacity compared with coconut shell activated carl ms. The different activated carbon controlled release process marched with Higuchi equation.
出处
《西南林业大学学报（自然科学）》
CAS
北大核心
2016年第2期142-145,共4页
Journal of Southwest Forestry University：Natural Sciences
基金
福建省自然科学基金项目(2011J01283)资助
关键词
活性炭
甲磺酸培氟沙星
热力学
吸附
缓释
activated carbon
pefloxacin mesylate
thermodynamics
adsorption
controlled release
作者简介
谭非（1971-），男，副教授，博士。研究方向：生物质材料。Email：1001tf@163．com。
