摘要
为建立提高碱木质素(KL)吸附性能的改性理论依据,并推进其作为染料废水吸附材料的工程化应用,研究了KL对染料废水中亚甲基蓝(MB)的吸附性能和吸附作用机制。考察了MB初始质量浓度、吸附时间和溶液pH值对KL吸附MB的影响规律。结合溶液环境对吸附行为的影响规律以及红外光谱,研究了KL和MB间的相互作用机制。实验表明,在30℃下,KL对MB的饱和吸附量为291 mg/g,在前50 min具有较快的吸附速率,并且对低质量浓度的MB仍表现出良好的吸附效果。KL对MB的吸附等温线符合Langmiur模型,吸附过程符合拟二级动力学模型。KL和MB间的π-π、静电、氢键和疏水作用以及KL在溶液中的聚集结构都会对吸附过程产生显著影响。
In order to establish the modification theoretical basis for improving the adsorption properties of kraft lignin(KL)and promote its engineering application as dye wastewater adsorption material,the performance of kraft lignin for the adsorption of methylene blue(MB)and its mechanism were studied.The effects of the initial mass concentration,contact time and pH were systematically investigated.According to the influence of solution environment on adsorption and FT-IR characterization,the adsorption mechanism between kraft lignin and MB was studied.The experiment shows that the maximum adsorption capacity of MB onto KL is 291 mg/g at 30℃,which has a rapid adsorption rate within the first 50 min and the high removal rate could be achieved even at a low mass concentration.The adsorption isotherms are better fitted to the Langmuir model,and the adsorption process is fitted well to second order kinetic model.Theπ-πinteraction between KL and MB,electrostatic,hydrogen bond,hydrophobic interaction as well as the aaggregation structure of KL in solution are all contributed to the adsorption process.
作者
李浩
刘嘉瑛
袁泽
方静
LI Hao;LIU Jia-ying;YUAN Ze;FANG Jing(Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou 510640,Guangdong Province,China;National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China)
出处
《化学工程》
CAS
CSCD
北大核心
2021年第3期12-16,44,共6页
Chemical Engineering(China)
基金
广东省新能源和可再生能源研究开发与应用重点实验室开放基金(Y707s91001)
天津市自然科学基金资助项目(20JCQNJC00680)。
关键词
吸附
碱木质素
亚甲基蓝
染料废水
adsorption
kraft lignin
methylene blue
dye wastewater
