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首页> 外文期刊>RSC Advances >3D welan gum-graphene oxide composite hydrogels with efficient dye adsorption capacity
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3D welan gum-graphene oxide composite hydrogels with efficient dye adsorption capacity

机译：具有高效染料吸附能力的3D Welan胶-氧化石墨烯复合水凝胶

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摘要

As a renewable material, welan gum is a kind of both biocompatible and biodegradable microbial polysaccharide and can be used to form polysaccharide/inorganic material composites. In this article, welan gum-graphene oxide (GO) composite hydrogels were prepared by simple self-assembly of both components in aqueous media and the effects of GO on the gelation of welan gum were systematically studied. The welan gum-GO hybrid hydrogels have been thoroughly characterized using transmission electron microscopy (TEM), atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and rheological measurements. It can be observed that GO is dispersed on a molecular scale in the welan gum matrix and the interactions such as hydrophobic interaction, electrostatic interaction and hydrogen bonding occur between the welan gum matrix and graphene oxide sheets. The addition of GO which can act as a physical cross-linker in the hydrogel and effectively promote the gelation of welan gum, can be reflected by a decrease of the critical gelation concentration (CGC). Additionally, the welan gum-GO hybrid hydrogels exhibited good adsorption properties for water-soluble dyes such as methylene blue (MB), methyl violet (MV), amido black 10B (AB10B), rhodamine 6G (R6G) and chrome azurol S (CAS). Thus, it is expected that the GO-based composite hydrogels can act as adsorbents and have promising applications in the field of waste water treatment.
机译：作为一种可再生材料，Welan胶是一种具有生物相容性和可生物降解性的微生物多糖，可用于形成多糖/无机材料复合材料。本文通过水介质中两种组分的简单自组装制备了维兰胶-氧化石墨烯（GO）复合水凝胶，并系统研究了GO对维兰胶胶凝作用的影响。使用透射电子显微镜（TEM），原子力显微镜（AFM），场发射扫描电子显微镜（FE-SEM），傅立叶变换红外（FT-IR）光谱，X射线对welan gum-GO混合水凝胶进行了全面表征衍射（XRD），差示扫描量热法（DSC）和流变学测量。可以观察到GO在Welan胶基质中以分子尺度分散，并且Welan胶基质与氧化石墨烯片之间发生相互作用，例如疏水相互作用，静电相互作用和氢键。可以在水凝胶中充当物理交联剂并有效促进韦兰胶的凝胶化的GO的添加可以通过降低临界胶凝浓度（CGC）来反映。此外，Welan gum-GO杂化水凝胶对水溶性染料如亚甲蓝（MB），甲基紫（MV），酰胺黑10B（AB10B），若丹明6G（R6G）和铬天青S（CAS）表现出良好的吸附性能。 ）。因此，期望基于GO的复合水凝胶可以充当吸附剂并且在废水处理领域中具有有前途的应用。

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