改性木屑、花生壳和稻壳对亚甲基蓝的吸附  

Adsorption of Methylene Blue on Modified Sawdust,Peanut Husk and Rice Husk

作　　者：王彦民[1,2] 王娅丽 刘鹤蒙[5] 宋凤敏 李琛[1,2] WANG Yan-min;WANG Ya-li;LIU He-meng;SONG Feng-min;LI Chen(College of Chemistry and Environmental Science,Shaanxi University of Technology,Hanzhong 723001,China;Shaanxi Province Key Laboratory of Catalytic Fundamental&Applications,Hanzhong 723001,China;Hanzhong Environment Monitoring Center,Hanzhong 723001,China;College of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]陕西理工大学化学与环境科学学院,汉中723001 [2]陕西理工大学陕西省催化基础与应用重点实验室,汉中723001 [3]陕西理工大学 [4]陕西省汉中市环境监测中心站,汉中723001 [5]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《科学技术与工程》2018年第10期311-315,共5页Science Technology and Engineering

基　　金：陕西省教育厅科研计划(17JK0159)、陕西理工大学2017年人才引进基金资助(SLGQD2017-16)和秦巴山区生物资源综合开发协同创新中心项目(QBXT-Z(P)-15-17)资助

摘　　要：研究了醋酸改性枫香木木屑、花生壳和稻壳对溶液中亚甲基蓝染料的吸附过程。探讨了pH、吸附剂投加量、染料初始浓度、温度和吸附时间等因素对吸附率的影响。结果表明不同改性材料对亚甲基蓝的吸附影响不同。在各自最优条件下,改性木屑、花生壳和稻壳对亚甲基蓝的吸附率分别为99.02%、97.70%和97.95%。3种材料对亚甲基蓝的吸附等温线均符合Langmuir模型,最大吸附量分别为48.54 mg/g、49.51 mg/g和40.17 mg/g。吸附动力学均符合准二级动力学模型,速率常数由大到小为改性花生壳≈改性稻壳>改性木屑。Adsorption of methylene blue(MB)by wood sawdust,peanut husk and rice husk modified with acetic acid was studied.The influences of pH,adsorbent dose,initial dye concentration,temperature,and contact time on adsorption efficiency were investigated.Results showed that under the optimal conditions,the adsorption efficiencies of MB on 3 adsorbents were 99.02%,97.7%and 97.95%,respectively.Adsorption isotherm accorded with Langmuir model well.The maximum monolayer adsorption capacities of MB on 3 adsorbents were 48.54,49.51 and 40.17 mg/g,respectively.Adsorption kinetics was better described by the pseudo-second-order kinetic model.The order of adsorption rate constant followed by modified peanut husk≈modified rice husk>modified wood sawdust.

关 键 词：农林废弃物 醋酸改性 亚甲基蓝 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]