Highly Efficient Removal of Methylene Blue Dye from an Aqueous Solution Using Cellulose Acetate Nanofibrous Membranes Modified by Polydopamine

Jiaqi Cheng, Conghua Zhan, Jiahui Wu, Zhixiang Cui*, Junhui Si, Qianting Wang, Xiangfang Peng, Lih Sheng Turng

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

188 Scopus citations

Abstract

A new type of deacetylated cellulose acetate (DA)@polydopamine (PDA) composite nanofiber membrane was fabricated by electrospinning and surface modification. The membrane was applied as a highly efficient adsorbent for removing methylene blue (MB) from an aqueous solution. The morphology, surface chemistry, surface wettability, and effects of operating conditions on MB adsorption ability, as well as the equilibrium, kinetics, thermodynamics, and mechanism of adsorption, were systematically studied. The results demonstrated that a uniform PDA coating layer was successfully developed on the surface of DA nanofibers. The adsorption capacity of the DA@PDA nanofiber membrane reached up to 88.2 mg/g at a temperature of 25 °C and a pH of 6.5 after adsorption for 30 h, which is about 8.6 times higher than that of DA nanofibers. The experimental results showed that the adsorption behavior of DA@PDA composite nanofibers followed the Weber's intraparticle diffusion model, pseudo-second-order model, and Langmuir isothermal model. A thermodynamic analysis indicated that endothermic, spontaneous, and physisorption processes occurred. Based on the experimental results, the adsorption mechanism of DA@PDA composite nanofibers was also demonstrated.

Original languageEnglish
Pages (from-to)5389-5400
Number of pages12
JournalACS Omega
Volume5
Issue number10
DOIs
StatePublished - 17 03 2020
Externally publishedYes

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Publisher Copyright:
Copyright © 2020 American Chemical Society.

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