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Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application
journal contribution
posted on 2018-11-23, 10:04 authored by Bingjie Wang, Zhishan Bai, Haoran Jiang, Pepijn Prinsen, Rafael Luque, Shuangliang Zhao, Jin XuanMany 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 (R2 = 0.999), while the isotherm was fitted best to the Langmuir model (R2 = 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.
Funding
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).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Published in
Journal of Hazardous MaterialsVolume
364Pages
192 - 205Citation
WANG, B. ... et al, 2018. Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application. Journal of Hazardous Materials, 364, pp.192-205.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This paper was accepted for publication in the journal Journal of Hazardous Materials and the definitive published version is available at https://doi.org/10.1016/j.jhazmat.2018.10.024Acceptance date
2018-10-09Publication date
2018-10-15Copyright date
2019ISSN
0304-3894Publisher version
Language
- en