文献类型：期刊文献

英文题名：Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application

作者：Wang, Bingjie[1,2];Bai, Zhishan[1];Jiang, Haoran[3];Prinsen, Pepijn[2];Luque, Rafael[2];Zhao, Shuangliang[3];Xuan, Jin[4]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Univ Cordoba, Dept Quim Organ, Edif Marie Curie,Ctra Nnal 4-A,Km 396, E-14014 Cordoba, Spain;[3]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]Loughborough Univ, Dept Chem Engn, Loughborough LE11 3TU, Leics, England

年份：2019

卷号：364

起止页码：192

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000452926500022)】；

基金：This work is supported by The National Basic Research Program of China (973 Program, 2014CB748500), National Natural Science Foundation of China (51406057, 51578239, 51322805) and Research Fund for the Doctoral Program of Higher Education of China (20130074120019).

语种：英文

外文关键词：Wastewater treatment; Selective heavy metal ions removal; Microfluidic technology; CS microspheres; Integrated adsorption mechanism analytic system; DFT analysis

摘要：Many industrial wastewater streams contain heavy metals, posing serious and irreversible damage to humans and living organisms, even at low concentrations due to their high toxicity and persistence in the environment. In this study, high-performance monodispersed chitosan (CS) microspheres were prepared using a simple microfluidic method and evaluated for metal removal from contaminated water. Batch experiments were carried out to evaluate the adsorption characteristics for the removal of copper ions, one representative heavy metal, from aqueous solutions. The inherent advantages of microfluidics enabled a precise control of particle size (CV = 2.3%), while exhibiting outstanding selectivity towards target ions (adsorption capacity 75.52 mg g(-1)) and fair regeneration (re adsorption efficiency 74% after 5 cycles). An integrated adsorption mechanism analytic system was developed based on different adsorption kinetics and isotherms models, providing an excellent adsorption prediction model with pseudo-second order kinetics (R-2 = 0.999), while the isotherm was fitted best to the Langmuir model (R-2 = 0.998). The multi-step adsorption process was revealed via quantitative measurements and schematically described. Selective adsorption performance of CS microspheres in the present of other competitive metal ions with different valence states has been demonstrated and studied by both experimental and density functional theory (DFT) analysis.