外墙保温板废弃物基活性炭吸附氨氮的研究  

Study on ammonia nitrogen adsorption by activated carbon from waste external-wall insulation board

作　　者：张仕伟 高丽娟[1] 朱亚明[1] 赵雪飞[1] ZHANG Shiwei;GAO Lijuan;ZHU Yaming;ZHAO Xuefei(Engineering Research Center of Advanced Coal Coking and Efficient Use of Coal Resources,University of Science and Technology Liaoning,Anshan 114051,China;Lingyuan Iron and Steel Group CO.LTD.,Lingyuan 122500,China)

机构地区：[1]辽宁科技大学先进煤焦化及煤资源高效利用工程研究中心,辽宁鞍山114051 [2]凌源钢铁集团有限责任公司,辽宁凌源122500

出　　处：《辽宁科技大学学报》2020年第3期202-207,共6页Journal of University of Science and Technology Liaoning

基　　金：辽宁省煤化工工程技术中心开放项目(2013-05);辽宁科技大学先进煤焦化及煤资源高效利用工程研究中心开放基金(USTLKFZD201503)。

摘　　要：以外墙保温板废弃物为碳源制备活性炭,采用BET和SEM对其进行表征,并考察制备的活性炭对氨氮的吸附性能。针对吸附温度、pH、质量浓度等因素对氨氮吸附量的影响,确定了吸附工艺参数:恒温15℃、pH为5、氨氮平衡质量浓度14 mg/mL、吸附120 min;此条件下的吸附量为878.21 mg/g。动力学分析表明,氨氮在外墙保温板残料基活性炭上的吸附符合准一级模型,活化能为38.502 kJ/mol。等温吸附拟合符合Freundlic模型。热力学分析得到氨氮吸附焓变-7.592 kJ/mol,熵变-42.90 J/(mol·K)。活性炭对氨氮的吸附是放热过程,吸附无需加热。Activated carbon was prepared by using waste external-wall insulation board as carbon source,and was characterized by BET and SEM.Adsorption property of the activated carbon to ammonia nitrogen was investigated.The adsorption process parameters to ammonia nitrogen were determined as the temperature of 15℃,the pH value of 5,the equilibrium concentration of ammonia nitrogen of 14 mg/mL,and the time of 120 min.Under these conditions,the adsorption capacity was 878.21 mg/g.The kinetic analysis shows that the adsorption of ammonia nitrogen by the activated carbon follows the quasi-first-order model with an activation energy of 38.502 kJ/mol.Isothermal adsorption fitting conforms to the Freundlic model.Thermodynamic analysis shows that the enthalpy change of ammonia nitrogen adsorption is-7.592 kJ/mol,and the entropy change is-42.90 J/(mol·K).The adsorption of ammonia nitrogen is an exothermic process,and heating is not necessary.

关 键 词：外墙保温板残料基活性炭 氨氮废水 等温吸附模型 吸附动力学模型 

分 类 号：TQ424.1[化学工程]