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Nano-/Micro-confined Water in graphene hydrogel as Superadsorbents for Water Purification

Nano-Micro Letters 2020年第1期12卷 13-26页

作者： Yiran Sun Fei Yu Cong Li Xiaohu Dai Jie Ma State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China College of Marine Ecology and Environment Shanghai Ocean UniversityShanghai 201306People’s Republic of China Department of Chemical and Biomolecular Engineering The University of AkronAkronOH 44325USA Research Center for Environmental Functional Materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092People’s Republic of China

Confined water has been proven to be of great importance due to its pervasiveness and contribution to life and many fields of scientific research.However,the control and characterization of confined water are a challenge.Herein,a confined space is constructed by flexibly changing the pH of a graphene oxide dispersion under the self-assembly process of a graphene hydrogel(GH),and the confined space is adjusted with variation from 10.04 to 3.52 nm.Confined water content in GH increases when the pore diameter of the confined space decreases;the corresponding adsorption capacity increases from 243.04 to 442.91 mg g−1.Moreover,attenuated total reflectance Fourier transform infrared spectroscopy and Raman spectroscopy are utilized to analyze the hydrogen bonding structure qualitatively and quantitatively,and correlation analysis reveals that the improvement in the adsorption capacity is caused by incomplete hydrogen bonding in the confined water.Further,confined water is assembled into four typical porous commercial adsorbents,and a remarkable enhancement of the adsorption capacity is achieved.This research demonstrates the application potential for the extraordinary properties of confined water and has implications for the development of highly effective confined water-modified adsorbents.

关键词： Confined water graphene hydrogel Hydrogen bonding Adsorption Antibiotic

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Flexible Three-Dimensional graphene hydrogels with Superior Conductivity and Excellent Electrochemical Performance for Supercapacitor Electrodes

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Chinese Journal of Chemistry 2017年第10期35卷 1601-1610页

作者： Juan Zhang Bo Zhou Bo Zhao Ling Si Xiaoqing Jiang Jiangsu Key Laboratory of New Power Batteries College of Chemistry and Materials Science Nanjing Normal University Nanjing Jiangsu 210023 China

Three-dimensional porous graphene hydrogels have been prepared by a green and facile but very efficient ap- proach using glucose as an assistant. Based on a one-step hydrothermal reaction with optimal experimental condi- tions such as the reaction time and temperature, the graphene hydrogels exhibit a superior electrical conductivity （95.3 S/m） and can be used as supercapacitor electrode without any binder or conducting additives but showing a high specific capacitance of 384.6 F/g at a current density of 1 A/g. The results show that addition of glucose can not only greatly decrease the reaction temperature but also shorten the reaction time. The superior performance of the three-dimensional porous graphene hydrogels as electrode for supercapacitor suggests its promising potentials in the field of energy storage devices.

关键词： glucose green reducing graphene hydrogel supercapacitor

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Self-assembly of graphene oxide nanosheets in t-butanol/water medium under gamma-ray radiation

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Chinese Chemical Letters 2018年第6期29卷 931-934页

作者： Weikang Wang Yihu Wu Zhiwen Jiang Mozhen Wang Qichao Wu Xiao Zhou Xuewu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Guangdong Tianan New Material Co. Ltd.

The research on the properties of graphene oxide（GO） in various media has become one of the hottest topics since GO is now the main raw material for graphene-based advanced materials. In this work, the g-ray radiation chemistry effect of GO nanosheets and their self-aggregation behavior in t-butanol/water medium were investigated. The results show that GO nanosheets are reduced and hydroxyalkylated simultaneously by the alcohol free radicals produced by the radiolysis of t-butanol/water solution under g-ray radiation. The radiation-modified GO nanosheets will self-assemble into a self-standing graphene hydrogel when the p H of the solution is lower than 2. A hydroxyl-functionalized free-standing graphene aerogel is further obtained simply by freeze-drying. This work provides not only a general self-assembly mechanism of GO nanosheets in strong acidic alcohol/water media under high energy radiation, but also a facile and economical preparation method for hydroxyalkylated graphene-based aerogel.

关键词： graphene oxide Gamma-ray radiation t-Butanol/water solution Self-assembly Hydroxyalkylation graphene hydrogel graphene aerogel

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Preparation of 3D hierarchical porous KNCP-GH/NF as High-performance Electrode Materials for Supercapacitors

Preparation of 3D hierarchical porous KNCP-GH/NF as High-per...

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河南省化学会2020年学术年会

作者： Xueying Ma Li Zhang Shaokui Cao School of Materials Science and Engineering Zhengzhou University

Supercapacitors have attracted much attention because of their importance in energy storage.Alkali transition metal phosphate has the advantages of rich redox valence,high theoretical capacitance,abundant sources,and environmental friendliness,and become a promising electrode material for supercapacitors.Here,graphene hydrogel/nickel foam (GH/NF) supported KNiCoPO (KNCP) with flower-like hierarchical porous structure was obtained by a one-step hydrothermal method,where KNCP has a higher loading amount and smaller particle size.The resultant KNCP-GH/NF electrode exhibited a high specific capacitance of 6480mF/cm (1751.35 F/g) at 2 mA/cm.The all-solid-state asymmetric supercapacitor was assembled using KNCP-GH/NF as the positive electrode and FeP-G/NF as the negative electrode,which delivered a high energy density of 89.63Wh/Kg and power density of 9375W/Kg.After 5000cycles of charge and discharge,the capacitance can hold 81.2%.

关键词： KNi0.67Co0.33PO4 graphene hydrogel hierarchical porous structure

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