Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 1, Pages 1850-1860Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c17201
Keywords
graphene oxide membrane; unzipped multiwalled carbon nanotubes; nanofiltration membranes; high flux; water treatment
Funding
- Natural Scientific Foundation of China [51878361, 52070104, 51503112]
- Natural Scientific Foundation of Shandong Province [ZR2019MEM048]
- State Key Project of International Cooperation Research [2016YFE0110800, 2017YFE0108300]
- 1st Class Discipline Program of Materials Science of Shandong Province
- National Program for Introducing Talents of Discipline to Universities (111 plan)
- Henry Samueli School of Engineering & Applied Science
- Department of Bioengineering at the University of California, Los Angeles
- Double-Hundred Foreign Expert Program of Shandong Province (2019-2021)
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Researchers reported an embedded graphene oxide membrane with unzipped carbon nanotubes (CNTs) that have wide applicability in molecular separation and water purification techniques. The study investigated the effects of different bandwidths of unzipped CNTs on their properties and prepared four composite membranes with varying bandwidths through a vacuum-assisted filtration process. One of the membranes exhibited good stability in different pH solutions and showed increased water permeability with the increase of inserted CNT's bandwidth.
Carbon nanomaterials have proven their wide applicability in molecular separation and water purification techniques. Here, an unzipped carbon nanotubes (CNT) embedded graphene oxide (GO) membrane (uCNTm) is reported. The multiwalled CNTs were longitudinally cut into multilayer graphene oxide nanoribbons by a modified Hummer method. To investigate the varying effects of different bandwidths of unzipped CNTs on their properties, four uCNTms were prepared by a vacuum-assisted filtration process. Unzipped-CNTs with different bandwidths were made by unzipping multiwalled CNTs with outer diameters of 0-10, 10-20, 20-30, and 30-50 nm and named uCNTm-1, uCNTm-2, uCNTm-3, and uCNTm-4, respectively. The uCNTm-5 exhibited good stability in different pH solutions, and the water permeability of the composite membranes showed an increasing trend with the increase of the inserted uCNTm's bandwidth up to 107 L.m(-2).h(-1).bar(-1), which was more than 10 times greater than that of pure GO membranes. The composite membranes showed decent dye screening performance with the rejection rate of methylene blue and rhodamine B both greater than 99%.
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