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

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journal contribution
posted on 23.11.2018 by Bingjie Wang, Zhishan Bai, Haoran Jiang, Pepijn Prinsen, Rafael Luque, Shuangliang Zhao, Jin Xuan
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 (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 Materials

Volume

364

Pages

192 - 205

Citation

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

© Elsevier

Version

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.2018.10.024

Acceptance date

09/10/2018

Publication date

2018-10-15

Copyright date

2019

ISSN

0304-3894

Language

en

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