微波活化稻壳基生物质材料对亚甲基蓝的吸附性能  

Adsorptive properties of methylene blue using biomass material based on rice husks by microwave-assisted activation

作　　者：钟倩倩[1] 赵雅琴[2] 吴爱兵[1] 王磊[3] 沈丽[1] 王鹏 Qianqian ZHONG;Yaqin ZHAO;Aibing WU;Lei WANG;Li SHEN;Peng WANG(Department of Environmental and Chemical Engineering,Tangshan University,Tangshan,Hebei 063000,China;China University of Mining and Technology,School of Environment Science and Spatial Informatics,Xuzhou,Jiangsu 221116,China;Department of Chemistry,Tangshan Normal University,Tangshan,Hebei 063000,China)

机构地区：[1]唐山学院环境与化学工程系,河北唐山063000 [2]中国矿业大学环境与测绘学院,江苏徐州221116 [3]唐山师范学院化学系,河北唐山063000

出　　处：《过程工程学报》2018年第6期1210-1218,共9页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金青年基金资助项目(编号:51602344);河北省高等学校科学技术研究项目(编号:Z2018017);唐山市科技计划项目(编号:17110223a)

摘　　要：以KOH为活化剂,采用微波活化法处理农业废稻壳,制备生物质吸附材料,通过静态吸附实验考察了其对阳离子染料亚甲基蓝的吸附性能.结果表明,所制生物质材料对亚甲基蓝的最大吸附量为109.9mg/g,吸附过程符合伪二级动力学方程和Langmuir等温吸附模式,为快速吸附和单分子层吸附,膜扩散是速率控制步骤,吸附过程为生物质材料孔道内部物理吸附和O-H官能团吸附的共同作用.Microwave assisted KOH activation has been utilized for preparation of biomass adsorption material based on agricultural waste rice husks (RH).Batch experiments were conducted to evaluate the sorption performance of cationic dye methylene blue (MB)by modified rice husks (MRH)from aqueous solutions.The effects of solution initial pH,dosage of the adsorbents,salt concentration,the dyeing and finishing auxiliary concentration,contact time and temperature on MB adsorption were investigated.The results showed that MRH had a wide appropriate pH range of 5-11 for MB adsorption, which showed the potential applicability in the actual water body.With NaCl concentration increasing from 0 to 0.2 mol/L,the removal efficiency of MB decreased from 58.24% to 1.86%;while,MB removal increasesd with increasing SDBS concentration.The sorption process for MB onto MRH was an endothermic reaction and the adsorption process reached equilibrium within 30-45 min.The obtained product MRH had a maximum MB adsorption capacity of 109.9mg/g.The experimental kinetic data were well described by the pseudo-second order model and the best fitting for MB experimental equilibrium data was achieved with the Langmuir isotherm,which was a rapid and monolayer adsorption process.Film diffusion was the rate-limiting step which was primarily responsible for the adsorption of MB on MRH.Physical adsorption inside the pores of biomass materials and O-H functional groups adsorption both contributed to the adsorption mechanism.

关 键 词：生物质 微波活化 吸附 亚甲基蓝 

分 类 号：O647.3[理学—物理化学]