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Environmental application of three-dimensional graphene materials as adsorbents for dyes and heavy metals: Review on Ice-templating method and adsorption mechanisms

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Journal of Environmental Sciences 2019年第5期31卷 174-199页

作者： Kar Chiew Lai Lai Yee Lee Billie Yan Zhang Hiew Suchithra Thangalazhy-Gopakumar Suyin Gan Department of Chemical and Environmental Engineering University of Nottingham Malaysia Campus

The remediation of wastewater requires treatment technologies which are robust, efficient,simple to operate and affordable such as adsorption. Lately, three-dimensional(3D)graphene based materials have attracted significant attention as effective adsorbents for wastewater treatment. The intrinsic properties of 3D graphene structure such as large surface area and interconnected porous structure can facilitate the transport of pollutants into the 3D network and provide abundant active sites for trapping the pollutants. For the synthesis of 3D graphene structure, Ice-templating is commonly practiced due to its facile steps, cost effectiveness and high scalability potential. This review covers the icetemplating fabrication technique for 3D graphene based materials and their application as adsorbents in eliminating dyes and heavy metals from aqueous media. The assembly mechanisms of the Ice-templating fsynthesis are comprehensively discussed. Further discussion on the fundamental principles, critical process parameters and characteristics of ice-templated 3D graphene structures is also included. A thorough review on the mechanisms for batch adsorption of dyes and heavy metals is presented based on the structures and properties of the 3D graphene materials. The review further evaluates the dynamic adsorption in packed columns and the regeneration of 3D graphene based materials.

关键词： Ice-templating 3D graphene based structure Adsorption mechanism Dyes Heavy metals

Preparation and Characterization of Poly(vinyl alcohol)/ZIF-8 Porous Composites by Ice-templating Method with High ZIF-8 Loading Amount

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Chinese Journal of Polymer Science 2020年第6期38卷 638-643页

作者： Xuan-He Yang Yan-Qing Yao Mu-Hua Huang Chun-Peng Chai School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

A bulk Poly(vinyl alcohol)/ZIF-8(PVA/ZIF-8)porous composite with aligned porous structure was prepared by Ice-templating method.The microstructure of PVA/ZIF-8 porous composites was characterized by scanning electron microscopy(SEM).The results showed that the composites had regular pore structure and ZIF-8 nanoparticles were evenly distributed on the skeleton of PVA.X-ray diffraction(XRD)test results showed that the crystalline structure of ZIF-8 was well preserved in the composites.The specific surface area of the composite was characterized by nitrogen adsorption/desorption test.The specific surface area of the composite was up to 1160 m^2 g^1.PVA/ZIF-8 porous composites could also support a certain weight with almost no volume shrinkage.The carbon dioxide adsorption quantity of the composite was up to 11.3 cm^3 g^1,proving that PVA/ZIF-8 porous composite has a good application prospect in the field of carbon dioxide adsorption.

关键词： Poly(vinyl alcohol) ZIF-8 Ice-templating Porous composite C02 adsorption

ice-templated porous tungsten and tungsten carbide inspired by natural wood

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Journal of Materials Science & Technology 2020年第10期42卷 187-197页

作者： Yuan Zhang Guoqi Tan Da Jiao Jian Zhang Shaogang Wang Feng Liu Zengqian Liu Longchao Zhuo Zhefeng Zhang Sylvain Deville Robert O.Ritchie Laboratory of Fatigue and Fracture for Materials Institute of Metal Research.Chinese Academy of SciencesShenyang 110016China School of Mechanical Engineering Liaoning Shihua UniversityFushun 113001China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Xi'an University of TechnologyXi'an710048China Laboratoire De Synthese Et Fonctionnalisation Des Ceramiques UMR3080 CNRS/Saint-Gobain CREESaint-Gobain Research ProvenceCavaillon 84306France Department ofMateriab Science and Engineering University of California BerkeleyBerkeleyCA 94720USA

The structures of tungsten and tungsten carbide scaffolds play a key role in determining the properties of their infiltrated composites for multifunctional applications.However,it is challenging to construct and control the architectures by means of self-assembly in W/WC systems because of their large densities.Here we present the development of unidirectionally porous architectures,with high porosities exceeding 65 vol.%,for W and WC scaffolds which in many respects reproduce the design motif of natural wood using a direct Ice-templating technique.This was achieved by adjusting the viscosities of suspensions to retard sedimentation during freezing.The processing,structural characteristics and mechanical properties of the resulting scaffolds were investigated with the correlations between them explored.Quantitative relationships were established to describe their strengths based on the mechanics of cellular solids by taking into account both inter-and intra-lamellar pores.The fracture mechanisms were also identified,especially in light of the porosity.This study extends the effectiveness of the Ice-templating technique for systems with large densities or particle sizes.It further provides preforms for developing new natureinspired multifunctional materials,as represented by W/WC-Cu composites.

关键词： Ice-templating Tungsten Scaffolds Fracture mechanisms Bioinspired materials