Floating, highly efficient, and scalable graphene membranes for seawater desalination using solar energy

Literature Information

Publication Date 2018-07-09
DOI 10.1039/C8GC01347K
Impact Factor 10.182
Authors

Guijun Li, Wing-Cheung Law, Kang Cheung Chan


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Abstract

Seawater dehydrates humans when it is drunk untreated, due to its high concentrations of salts. Currently, it can only be purified into large amounts of freshwater using reverse osmosis, with large electricity consumption, carbon emissions and environmental damage. Although seawater directly evaporates under natural sunlight, the efficiencies and scales are too small for practical collection. Herein, we report a floating graphene membrane for evaporating seawater into freshwater exclusively using solar energy, with high efficiency and large scalability. Polyimide films can be fully converted to graphene membranes using one-step laser scribing, without involving chemicals or generating wastes. These green desalination graphene membranes evaporate water at a rate up to 1.37 kg m−2 h−1 under one sun illumination, which possesses even higher purity than domestic water. These graphene membranes can float firmly at the air–water interface with a self-righting ability, such that the process is feasible for practical water desalination on ocean surfaces.

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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.

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