膨胀石墨基炭/炭复合材料对苯酚的吸附动力学
Phenol Adsorption Kinetics of Expanded Graphite-Based Carbon/Carbon Composites
摘 要
以蔗糖为炭源、磷酸为活化剂制备了膨胀石墨基炭/炭复合材料, 通过控制蔗糖溶液的浓度来调控活性炭膜的厚度, 用SEM观察其微观形貌, 并分析了复合材料的炭膜厚度对苯酚吸附动力学的影响。结果表明: 该复合材料对苯酚的吸附动力学性能与准二级速率方程有较好的相关性, 初始的吸附速率随着活性炭膜厚度的减小而提高; 复合材料对苯酚的吸附过程中, 颗粒内扩散机制占主要控制地位。
苯酚
吸附
动力学
EGCs
phenol
adsorption
kinetics
Abstract
Expanded graphite-based carbon/carbon composite was prepared with sucrose as carbon source and phosphoric acid as activator. The thickness of acticarbon film could be controlled by changing sucrose solution concentration. Microstructure was observed and the effect of carbon film thickness of the composite on phenol adsorption kinetics was analyzed. The results show that the adsorption property of phenol adsorption kinetics correlated well with the pseudo-second rate equation. The initial adsorption rates raised with the decrease of thickness of the acticarbon film. The particle internal dispersion mechanic dominated during phenol adsorption of composite.
中图分类号 TQ165
所属栏目
基金项目 江苏省自然科学基金资助项目(BK2009534); 江苏省油气储运重点实验室基金项目(CY0901)
收稿日期 2010/8/6
修改稿日期 2011/3/11
网络出版日期
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备注陈红(1986-), 女, 安徽芜湖人, 硕士研究生。
引用该论文: CHEN Hong,CHEN Zhi-gang,LIU Cheng-bao,WANG Zhen-bang,FU Meng. Phenol Adsorption Kinetics of Expanded Graphite-Based Carbon/Carbon Composites[J]. Materials for mechancial engineering, 2011, 35(9): 30～34
陈红,陈志刚,刘成宝,王振邦,付猛. 膨胀石墨基炭/炭复合材料对苯酚的吸附动力学[J]. 机械工程材料, 2011, 35(9): 30～34
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参考文献
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【3】BILOE S, GOETZ V. Characterization of adsorbent composite blocks for methane storage[J].Carbon,2001,39(11):1653-1662.
【4】MAREECHE J F, BEGIN D, FURDIN G. Monolithic activated carbons from resin impregnated expanded graphite[J].Carbon,2001,39(5):771-785.
【5】CHEN X, ZHENG Y P, KANG F. Preparation and structure analysis of carbon/carbon composite made from phenolic resin impregnation into exfoliated graphite[J].Journal of Physics and Chemistry of Solids,2006,67:1141-1144.
【6】SUAREZ-GARCIA F, MARTINEZ-ALONSO A, TASCON JMD,et al. Characterization of porous texture in composite adsorbents based on exfoliated graphite and polyfurfuryl alcohol[J].Fuel Processing Technology,2002,77/78:401-407.
【7】LIU Cheng-bao, CHEN Zhi-gang, CHENG Xiang-le,et al. Preparation and structure analysis of expanded graphite-based composites made by phosphoric acid activation[J].Journal of Porous Materials,2010,17(4):425-428.
【8】周伟.膨胀石墨的液相吸附/吸着行为及机理[D].北京: 清华大学, 2000.
【9】JAGIELLO J, ANIA C O, PARRA J B,et al. Using DFT analysis of adsorption data of multiple gases including H2 for the comprehensive characterization of microporous carbons[J].Carbon,2007,45(5):1066-1071.
【10】冯孝庭. 吸附分离技术 [M].北京:化学工业出版社,2000.
【11】朱江涛, 黄正宏, 康飞宇, 等.活性竹炭对苯酚的吸附动力学[J].新型炭材料,2008,23(4):326-330.
【12】HOYS, MCKAY G. Pseudo-second order model for sorption processes[J].Process Biochemistry,1999,34:451-465.
【13】YANG X, AL-DURI B. Kinetic modeling of liquid-phase adsorption of reactive dyes on activated carbon[J].Colloid Interface Sci,2005,28:725-734.
【14】HOYS. Citation review of lagergren kinetic rate equation on adsorption reactions[J].Scientometrics,2004,59:171-177.
【15】OFOMAJA A E. Kinetics and mechanism of methylene blue sorption onto palm kernel fiber[J].Process Biochem,2007,42:16-24.
【16】SRIVASTAVA V C, SWAMY M M, MALL I D,et al. Adsorptive removal of phenol by bagasse fly ash and activated carbon: equilibrium, kinetics and thermodynamics[J].Colloids Surf A,2006,272:89-104.
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