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当前位置: 首页 > 文章 > 稻草秸秆基活性炭对苯酚和亚甲基蓝的吸附性能研究 安徽农业科学 2009,37 (7) 3196-3199
Position: Home > Articles > Studies on Adsorption Properties of Activated Carbon of Rice Straw on Phenol and Methylene Blue Journal of Anhui Agricultural Sciences 2009,37 (7) 3196-3199

稻草秸秆基活性炭对苯酚和亚甲基蓝的吸附性能研究

作  者：
韩彬;薛罡;荣达;周美华
单  位：
东华大学环境科学与工程学院
关键词：
稻草秸秆;活性炭;化学活化;动力学;吸附
摘  要：
[目的]研究稻草秸秆基活性炭对苯酚和亚甲基蓝的吸附性能。[方法]选用(NH4)2HPO4为活化剂,利用农业废弃物——稻草秸秆为原料,通过化学活化法制得3种稻草秸秆基活性炭RN-1、RN-2和RN-3。通过N2吸附-脱附等温曲线和Boehm滴定法对其表面的物理和化学性质进行表征。[结果]结果表明,预氧化处理不仅会改变活性炭表面含氧基团的含量,也对其比表面积有影响。将活性炭应用于水中的亚甲基蓝和苯酚吸附,活性炭吸附苯酚和亚甲基蓝符合拟二级动力学方程。RN-3(187.7 mg/g)具有最大的苯酚吸附量,对亚甲基蓝的最大吸附量RN-3(166.35 mg/g)和RN-1(161.00 mg/g)相近。说明活性炭对亚甲基蓝的吸附受比表面积和含氧基团的共同影响,含氧基团量的升高不利于其对亚甲基蓝的吸附。[结论]该研究为稻草秸秆的合理利用提供科学依据,以达到以废制废的目的。
译  名：
Studies on Adsorption Properties of Activated Carbon of Rice Straw on Phenol and Methylene Blue
作  者：
HAN Bin et al(College of Environmental Science and engineering,Donghua University,Shanghai 201620)
关键词：
Rice straw;Activated carbon;Chemical activation;Kinetics;Adsorption
摘  要：
[Objective]The purpose of this research was to study adsorption properties of activated carbon of rice straw on phenol and methylene blue.[Method]A news kind of activated carbon(AC) based on rice straw,an agricultural by-product,was prepared by activation with diammonium hydrogen phosphate [(NH4)2HPO4]at 973 K for 60 min.Two pretreatment methods(air pre-oxidation after and before impregnation) and one without pre-oxidation were adopted to produce RN-3,RN-1 and RN-2,respectively.The characteristics of the AC were determined with N2 adsorption-desorption isotherms and Boehm titration.[Result]The results indicated that it was found that pre-oxidation would change AC's BET surface area and the concentration of surface acidic groups.The AC's were employed in wastewater treatment to adsorb phenol and methylene blue(MB).The kinetics of adsorption fitted the pseudo-second model better.Specifically,RN-3 had the highest adsorption capacity for phenol(187.7 mg/g),RN-3(166.35 mg/g) and RN-1(161.00 mg/g) for MB.Though RN-3 had the largest BET surface area(1 078 m2/g),its adsorption capacities for MB was not as high as expected,and this resulted from the highest concentration of acidic groups on its surface.Hence,the surface acidic groups were found to decrease the adsorption of both MB in aqueous solutions.[Conclusion]This study will provide the scientific reference for reasonable utilization of rice straw.

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