Regeneration of microwave assisted spent activated carbon: Process optimization, adsorption isotherms and kinetics
Regeneration of microwave assisted spent activated carbon: Process optimization, adsorption isotherms and kinetics
复制标题
微波辅助废活性炭的再生：工艺优化、吸附等温线和动力学
DOI：
10.1016/j.cep.2011.12.011
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发表时间：
2012-03-01
影响因子：
4.3
通讯作者：
Zhang Li-bo
中科院分区：
文献类型：
--
作者：
Duan Xin-hui;Srinivasakannan, C.;Zhang Li-bo
以水蒸气为再生剂，对硅工业用煤基废活性炭进行了微波辅助再生试验。采用响应面法（RSM）对工艺条件进行优化，确定了最佳工艺条件为：再生温度950 ℃，再生时间60 min，蒸汽流量2.5 g/min，在此条件下制得的活性炭碘值为1103 mg/g，得率为68.5%。BET表面积对应于1302 m2/g，孔体积为0.86cm3/g。该活性炭为多孔性，其比容为69.27%。测试再生碳对亚甲基蓝染料分子吸附的适用性。吸附等温线的产生和最大吸附容量被发现是385 mg/g，与等温线符合Langmuir等温线模型。吸附动力学符合准二级动力学模型。结果表明，再生活性炭的潜在应用液相吸附涉及高分子量的化合物。(C)2012爱思唯尔有限公司版权所有。
Microwave assisted regeneration of spent coal based activated carbon from the silicon industry has been attempted using steam as the regenerating agent. The response surface methodology (RSM) technique was utilized to optimize the process conditions and the optimum conditions have been identified to be a regeneration temperature of 950 degrees C, regeneration time of 60 min and steam flow rate of 2.5 g/min. The optimum conditions result in an activated carbon with iodine number of 1103 mg/g and a yield of 68.5% respectively. The BET surface area corresponds to 1302 m(2)/g, with the pore volume of 0.86 cm(3)/g. The activated carbon is heteroporous with a micropore volume of 69.27%. The regenerated carbon is tested for its suitability for adsorption of methylene blue dye molecule. The adsorption isotherms were generated and the maximum adsorption capacity was found to be 385 mg/g, with the isotherm adhering to Langmuir isotherm model. The kinetic of adsorption was found to match pseudo-second-order kinetic model. The results indicate potential application of the regenerated activated carbon for liquid phase adsorption involving high molecular weight compounds. (C) 2012 Elsevier B.V. All rights reserved.