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Structural and mech.nistic understanding of an active and durable graph.ne carbocatalyst for reduction of 4-nitroph.nol at room temperature

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Nano Research 2015年第12期8卷 3992-4006页

作者： huawen hu john h. xin hong hu xiaowen wang Nanotech.ology Centre Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong SAR 999077 China

Th. development of an active, durable, and metal-free carbocatalyst th.t is able to replace metal-based catalysts is of increasing scientific and tech.ological importance. Th. use of such.a catalyst would avoid problems caused by metal- containing catalysts, for example, environmental pollution by h.avy metals and depletion of rare metal resources. h.rein, an active and durable graph.ne carbocatalyst is presented for th. carbocatalytic conversion of 4-nitroph.nol to 4-aminoph.nol at ambient temperature. Th. carbocatalyst was prepared via a mild, water-based reaction between L-ascorbic acid （AA） and graph.ne oxide （GO） and did not involve any oth.r reactants. During th. structure and catalytic property optimization, a series of carbocatalysts were fabricated at various reaction temperatures and AA/GO ratios. Using several ch.racterization tech.iques, detailed structural features of th.se carbocatalysts were identified. Possible active species and sites on th. carbocatalysts were also identified such.as certain oxygen-containing groups, th. ~x-conjugated system, and graph.ne sh.et edges. In addition, th. synergistic effect between th.se active species and sites on th. resulting catalytic activity is h.gh.igh.ed. Furth.rmore, we clarified th. origin of th. h.gh.stability and durability of th. optimized carbocatalyst. Th. work presented h.re aids th. design of h.gh.performance carbocatalysts for h.drogenation reactions, and increases understanding of th. structural and mech.nistic aspects at th. molecular level th.t lead to h.gh.catalyst activity and durability.

关键词： metal-free graph.ne carbocatalyst activity and durability L-ascorbic acid active sites and domains synergistic effect carbocatalytic conversion of 4-nitroph.nol (4NP) to 4-aminoph.nol (4AP)

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Multifunctional organically modified graph.ne with.super-h.droph.bicity

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Nano Research 2014年第3期7卷 418-433页

作者： huawen hu Ch.n C. K. Allan Jianhua Li Yeeyee Kong xiaowen wang john h. xin hong hu Institute of Textiles and Cloth.ng The Hong Kong Polytechnic University Hong Kong Special Administrative Region (SAR) 999077 China

In order to bring graph.ne materials much.closer to real world applications, it is imperative to h.ve simple, efficient and eco-friendly ways to produce processable graph.ne derivatives. In th.s study, a h.droph.lic low-temperature th.rmally functionalized graph.ne and its super-h.droph.bic organically modified graph.ne derivative were fabricated. A unique structural topology was found and some of th. oxygen functionalities were retained on th. th.rmally functionalized graph.ne surfaces, wh.ch.facilitated th. subsequent h.gh.y effective organic modification reaction and led to th. super-h.droph.bic organically modified graph.ne with.multi functional applications in liquid marbles and polymer nanocomposites. Th. organic modification reaction also restored th. graph.nic conjugated structure of th. th.rmally functionalized graph.ne, particularly for organic modifiers h.ving longer alkyl ch.ins, as confirmed by various ch.racteri- zation tech.iques such.as electrical conductivity measurements, ultraviolet/visible spectroscopy and selected area electron diffraction. Th. free-standing soft liquid marble was fabricated by wrapping a water droplet with.th. super-h.droph.bic organically modified graph.ne, and sh.wed potential for use as a microreactor. As for th. polymer nanocomposites, a strong interfacial adh.sion is believed to exist between an organic polymer matrix and th. modified graph.ne because of th. organoph.lic coating formed on th. graph.ne base, wh.ch.resulted in large improvements in th. th.rmal and mech.nical properties of th. polymer nanocomposites with.th. modified graph.ne, even at very low loading levels. A new avenue h.s th.refore been opened up for large-scale production of processable graph.ne derivatives with.various practicable applications.

关键词： low-temperature th.rmallyfunctionalized graph.ne organic modification organically modifiedgraph.ne liquid marbles polymer nanocomposites

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