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Formation of larger-area graphene from small GO sheets in the presence of basic divalent sulfide species and its use in biomass conversion

机译:在碱性二价硫化物物种存在下,在小型去纸板上形成较大区域石墨烯及其在生物质转化中的应用

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Basic divalent sulfide species exhibit unique chemical activity in that they react with organic matter and function as a redox reagent. Herein, graphene oxide (GO) was modified by basic divalent sulfide species, and the modified materials were characterized by FT-IR spectra, XRD, UV-Vis, SEM, HRTEM, XPS, TG-MS analysis, Raman spectroscopy and electrical conductivity measurements. The results indicated that basic divalent sulfide species removed the abundant oxygen-containing groups from the basal plane of GO, in which the π-conjugated structure was largely restored. The basic divalent sulfide species also react with marginal oxygen-containing groups and were doped into GO to form large-area π-conjugated structures, resulting in the high electrical conductivity of sulfur-modified GO (SGO). TG-MS analysis showed that the basic divalent sulfide in SGO can be removed by heating, which provides a new method for preparing larger-area graphene sheets from GO with a smaller average size. In addition, SGO prepared without annealing displayed better performance in converting fructose, glucose, cellobiose and cellulose to 5-hydroxymethylfurfural (HMF) because it retained some acidic marginal oxygen-containing groups and basic divalent sulfide species.
机译:基本二价硫化物物种表现出独特的化学活性,因为它们与有机物反应并用作氧化还原试剂。在此,通过碱性二价硫化物物种改性石墨烯(GO),并通过FT-IR光谱,XRD,UV-VI,SEM,HRTEM,XPS,TG-MS分析,拉曼光谱和导电性测量来表征所述改性材料。结果表明,碱性二价硫化物物种从去的基础面上除去了丰富的含氧基团,其中π-缀合的结构大大恢复。基本二价硫化物物种也反应与边缘氧的基团反应,并掺杂进入大面积π-共轭结构,导致硫修饰的液体的电导率高(SGO)。 TG-MS分析表明,通过加热可以除去SgO中的基本二价硫化物,其提供了一种用于制备较大的平均尺寸的较大面积石墨烯片的新方法。另外,在不退火的情况下制备的SgO在将果糖,葡萄糖,纤维素和纤维素转化为5-羟甲基糠汞(HMF)时显示出更好的性能,因为它保留了一些酸性边缘氧基和碱性二价硫化物物种。

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