Layer-by-layer assembly of bio-inspired borate/graphene oxide membranes for dye removal

Autor: Yan Zhang, Tao Wen, Cong Ma, Xiaoju Yan, Xiangji Kong, Cheng Shirong, Sun Yue
Rok vydání: 2020
Předmět:
Environmental Engineering
Materials science
Surface Properties
Health
Toxicology and Mutagenesis
0208 environmental biotechnology
Acrylic Resins
Oxide
Environmental pollution
02 engineering and technology
Wastewater
010501 environmental sciences
01 natural sciences
Water Purification
law.invention
chemistry.chemical_compound
law
Borates
Methyl orange
Polyethyleneimine
Environmental Chemistry
Fourier transform infrared spectroscopy
0105 earth and related environmental sciences
Graphene
Layer by layer
technology
industry
and agriculture
Public Health
Environmental and Occupational Health
Polyacrylonitrile
Membranes
Artificial
General Medicine
General Chemistry
Pollution
020801 environmental engineering
Methylene Blue
Membrane
chemistry
Chemical engineering
Graphite
Azo Compounds
Filtration
Water Pollutants
Chemical
Zdroj: Chemosphere. 256:127118
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2020.127118
Popis: Dye wastewater is harmful to the ecological environment because of its potential biological toxicity, teratogenicity, carcinogenicity, and mutagenicity. We fabricated a layered graphene oxide (GO) membrane through layer-by-layer (LBL) self-assembly. We used borate to crosslink with GO on a polyethyleneimine (PEI)-coated hydrolyzed polyacrylonitrile (hPAN) support. Fourier transform infrared (FTIR) spectrometry, Raman spectra, and x-ray photoelectron spectroscopy (XPS) confirmed the presence of a crosslinking reaction. The dynamic thermomechanical analysis (DMA) results indicated that the introduction of borate can significantly improve the mechanical properties of the membrane. The Young's modulus, ultimate tensile strength, and proportional limit of borate that was assembled twice as the outermost layer were increased by 110.81%, 62.37%, and 53.72%, respectively, as compared to those of a single-layered GO membrane. Moreover, the pure water fluxes of the layered GO membrane did not obviously decrease with an increase in the number of layers. The flux of the membrane with an outermost layer of borate was greater than that of the previous GO layer. The salt and dye rejection of the membranes was augmented with an increase in the number of layers. For the GO membrane assembled three times, rejection to methyl orange (MO), methylene blue (MB), NaCl, MgCl2, and MgSO4 reached 74.02%, 88.56%, 14.55%, 27.50%, and 41.95%, respectively. The use of borate as an inorganic crosslinker can avoid the environmental pollution caused by organic agents, and improve the mechanical properties as well as the filter capability of the layered GO membrane. Therefore, this study presents a novel method of membrane preparation for dye removal.
Databáze: OpenAIRE
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