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Conductive 3D sponges for affordable and highly-efficient water purification

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Abstract

Effective, affordable and low energy water purification technologies are highly desirable to address the current environmental issues. In this study, we developed a low-cost method to achieve efficient organic pollutants degradation by incorporating conductive nanomaterials (i.e., carbon nanotubes, CNTs) to assist electro-oxidation, leading to an efficient conductive nano-sponge filtration device. The integration of electrochemistry has significantly improved the performance of the sponge-based device to adsorb and oxidize organic compounds in aqueous solution. In particular, CNT materials could serve as both high-performance electro-catalysts for pollutant degradation and conductive additives that make polyurethane sponges highly conductive. On the other hand, the polyurethane sponge could work as a low-cost and highly porous matrix that could effectively host these CNT conductors. The conductive sponge can be easily fabricated by a simple dying based approach. The as-fabricated gravity fed device could effectively oxidize two model organic compounds (i.e., >92% antibiotic tetracycline and >94% methyl orange) via a single pass through the conductive sponge under the optimized experimental conditions (e.g., [Na2SO4] = 10 mmol L−1, [CNT] = 0.3 mg mL−1, and [SDBS] = 2.0 mg mL−1). We have achieved >88% degradation efficiency for the antibiotic tetracycline within 6 h of continuous operation with an average electro-oxidation flux of 0.82 ± 0.05 mol h−1 m−2 and an energy requirement of 1.0 kW h kg−1 COD or <0.02 kW h m−3. These promising data make our CNT-sponge filtration device attractive for affordable and effective water purification.

Graphical abstract: Conductive 3D sponges for affordable and highly-efficient water purification

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Publication details

The article was received on 19 Dec 2017, accepted on 30 Jan 2018 and first published on 31 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR09435C
Citation: Nanoscale, 2018, Advance Article
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    Conductive 3D sponges for affordable and highly-efficient water purification

    Y. Liu, F. Li, Q. Xia, J. Wu, J. Liu, M. Huang and J. Xie, Nanoscale, 2018, Advance Article , DOI: 10.1039/C7NR09435C

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