NDLI: Enhanced adsorption and degradation of phenolic pollutants in water by carbon nanotube modified laccase-carrying electrospun fibrous membranes

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Environmental Science: Nano Vol - 3 Issue - 3

Environmental Science: Nano Vol - 3 Issue - 2

Environmental Science: Nano Vol - 3 Issue - 1

Environmental Science: Nano Vol -2

Environmental Science: Nano Vol -1

Enhanced adsorption and degradation of phenolic pollutants in water by carbon nanotube modified laccase-carrying electrospun fibrous membranes

Content Provider	Royal Society of Chemistry (RSC)
Author	Yao, Jun Yuan, Yu Song, Yonghui Dai, Yunrong Wang, Siyu
Copyright Year	2016
Abstract	Multi-walled carbon nanotube modified laccase-carrying electrospun fibrous membranes (MWCNTs-LCEFMs) were fabricated via co-electrospinning a poly(D,L-lactide) (PDLLA)/laccase/MWCNT mixed solution. A triblock copolymer PEO–PPO–PEO (F108) was added as an emulsifier to promote the dispersion of the laccase and acid-treated short MWCNTs in the electrospinning solution. The characterization results illustrated that the electrospun nanofibers possess a feature of being bead-free, porous and having a core–shell structure, with active laccase encapsulated inside the fibers and one end of some MWCNTs inserted into the edge of the pores. After being modified by a small amount (1.5 wt%, vs. PDLLA) of MWCNTs, the specific surface area and mechanical tensile strength of MWCNTs-LCEFMs were enhanced by about 2 and 3 times compared to those of LCEFMs, respectively. The MWCNTs-LCEFMs were applied to remove the widespread phenolic organics from water, including bisphenol A (BPA), triclosan (TCS) and 2,4-dichlorophenol (2,4-DCP). Benefiting from the improved adsorption property for substrates and the promoted electron transfer in the laccase-catalytic reaction, the MWCNTs-LCEFMs showed higher activity recovery (88.9% vs. free laccase), and better storage and operational stability than LCEFMs. In addition, the adsorption efficiencies of MWCNTs-LCEFMs for BPA and 2,4-DCP were enhanced by more than 50%. The removal efficiencies of MWCNTs-LCEFMs for 2,4-DCP, BPA and TCS reached 92.6 ± 0.74%, 95.5 ± 0.46% and 99.7 ± 0.02%, respectively, with the degradation efficiencies reaching 81.7 ± 1.9%, 90.5 ± 1.1% and 85.6 ± 1.5%, respectively. Meanwhile, the removal half-life (t1/2) of 2,4-DCP, BPA and TCS by the MWCNTs-LCEFMs was shortened to 7.9 ± 0.07, 4.7 ± 0.04 and 0.76 ± 0.01 min, respectively. The removal mechanism of these phenolic pollutants by MWCNTs-LCEFMs was considered as a synergistic effect of membrane adsorption and laccase degradation, where the catalytic degradation of laccase was obviously strengthened by the improved adsorption (pre-concentration) process of the fibers and MWCNTs, and the enhanced electron transfer process of MWCNTs.
Starting Page	857
Ending Page	868
Page Count	12
File Format	HTM / HTML PDF
ISSN	20518153
Volume Number	3
Issue Number	4
Journal	Environmental Science: Nano
DOI	10.1039/c6en00148c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	BPA TCS Carbon nanotube Polylactic acid Laccase Copolymer Emulsion Statistical dispersion Electrospinning Specific surface area Ultimate tensile strength Bisphenol A Triclosan 4-Dichlorophenol Adsorption Half-life
Content Type	Text
Resource Type	Article
Subject	Environmental Science Materials Science

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