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Ultra-high efficient pH induced selective removal of cationic and anionic dyes from complex coexisted solution by novel amphoteric biocomposite microspheres

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journal contribution
posted on 25.11.2019 by B Wang, X Yang, L Ma, L Zhai, Jin Xuan, C Liu, Z Bai
© 2019 Elsevier B.V. The substandard discharge of highly toxic dyestuff wastewater will pose a serious threat to the environment and human beings, even causing unimaginable irreversible damages. In the current study, novel amphoteric carboxymethyl chitosan/gelatin microspheres (CCGMs), synthesized by a facile inverse suspension route with two-step successive crosslinking process, were evaluated as a potential adsorbent for high efficient pH induced selective removal of azo-dyes. The as-prepared CCGMs were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Various influential factors such as solution pH, temperature, and contact time were employed to ascertain the optimal condition for representative azo-dyes adsorption, including methyl orange (MO) and methylene blue (MB). The maximal adsorption of MO and MB on the CCGMs at pH values of 3 and 11 were 383.142 mg g−1 and 584.795 mg g−1, respectively. The adsorption mechanism were demonstrated as the synergistic effect of electrostatic interaction and π-π stacking between dyes and CCGMs. Besides, the outstanding and stable regeneration of as-prepared CCGMs were also verified with five consecutive recycling. Thus, the newly developed CCGMs could be a highly promising candidate for dyestuff wastewater treatment.

Funding

National Key Research and Development Program of China (2016YFC0204500)

National Natural Science Foundation of China (51578239, 21878099, 51608203

Scientific Research Projects of Shanghai, China (17DZ1202802)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Separation and Purification Technology

Volume

231

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

©Elsevier

Publisher statement

This paper was accepted for publication in the journal Separation and Purification Technology and the definitive published version is available at https://doi.org/10.1016/j.seppur.2019.115922

Acceptance date

07/08/2019

Publication date

2019-08-08

Copyright date

2020

ISSN

1383-5866

eISSN

1873-3794

Language

en

Depositor

Prof Jin Xuan Deposit date: 22 November 2019

Article number

115922

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