凯发

Speaker-Litao Sun

Litao Sun
Southeast University, China

He is the director of Joint Center for Advanced Carbon Materials between SEU and Jiangnan Graphene Research Institute, director of SEU-FEI Nano-Pico center, deputy director of MOE Key Lab of MEMS. He is the founding chairman of IEEE Nanotechnology Council Nanjing Chapter, member of standing committee of Chinese Electron Microscopy Society, member of China Graphene Standardization Committee and Review Panel member of Graphene Flagship,European Union.

His research focuses on the synthesis and applications of nanomaterials in environment,renewable energy and micro-nano system. His main scientific achievements include realizing sub-nano fabrication and structure tailoring of 2D materials,firstly reporting the ultra-efficient absorbility of graphene sponge structures for oil and organic solvents, and designing ultra-sensitive sensors based on graphene. He is the author and co-author of over 100 papers on international journals including 2 in Science, 7 in Nature series journals, etc. He holds 42chinese patents and 2 international patents. He has given more than 30 invitedtalks at international conferences.

Group website: http://www.seu-npc.com

Title:Graphene-based macrostructures for oil/water separation
SymposiumB08 Environmental Governance (soil, sewage treatment)
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Abstract

Industrial oily wastewater and frequent oil-spill pollution have caused great danger to the ecological environment. It has been widely recognized that advanced materials will continue to play a more and more important role in the effort to control or remove these pollutions. Here we present our recent progress in oily wastewater treatment. Graphene nanosheets can be readily assembled into three dimensional spongy graphene (SG) via a pH-mediated hydrothermal reduction method. Due to its high specific surface area, hydrophobicity and low density, hydrophobic SG could be used as a versatile, ultra-efficient, and recyclable sorbent not only for petroleum products and fats, but also for common toxic solvents. In order to improve the sorption capacity of SG, a combination of direct freeze drying and flame treatment has been adopted to fabricate ultralow-density SG (~ 0.9 mg/cm3) whose sorption capability is improved by 8 times to over 600 times the weight of SG. The residual trace oil resulted from oil-spill cleanup also has huge damage to the ecological environment. Graphene-coated soft papers were produced to solve this problem due to its strong capillary action. The papers can not only sorb trace oil from water selectively and effectively, but also can achieve the separation for oil-in-water or water-in-oil emulsion. In addition, the superhydrophobic stainless steel mesh modified with graphene was fabricated to separate oil from water effectively. The mesh was integrated into a filter system, which then can achieve a three-phase (water-oil-suspended mater) separation. 

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E-mail: meeting@c-gia.org

Abstract: Minyang Lu

Sponsor: Wenyang Yang

Media: Liping Wang

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