生物质氧化石墨烯基双网络水凝胶球的制备与吸附性能

Preparation and Adsorption Properties of Biomass Graphene Oxide-based Double Network Hydrogel Spheres

为了减轻废弃甘蔗渣给环境带来的压力,以废弃甘蔗渣为原料,制备了生物质氧化石墨烯(BGO)。以Ca^(2+)交联的海藻酸钠(SA)为第一交联网络,以BGO为异质晶核,借助于冷冻-解冻法诱导聚乙烯醇(PVA)结晶交联,制备了PVA/SA/BGO双网络水凝胶球,考察了PVA/SA/BGO双网络水凝胶球的结构、形貌以及对有机染料结晶紫(CV)的吸附性能。结果表明:所得BGO具有片层结构和丰富的含氧基团。PVA/SA/BGO双网络水凝胶球对CV的最大吸附容量为460.21 mg·g^(-1),吸附过程符合Langmuir等温吸附模型和拟二级动力学吸附模型。

In order to alleviate the enormous pressure that waste bagasse puts on the environment,BGO was prepared from waste bagasse.With Ca^(2+)crosslinked SA as the first network and BGO as the heterogeneous nucleus for the second network,the PVA/SA/BGO double-network hydrogel spheres were constructed with the help of freeze-thaw method.The structure,morphology and adsorption properties of the PVA/SA/BGO double-network hydrogel for the organic dye crystalline violet(CV)were investigated.The results show that the obtained BGO has a lamellar structure and abundant oxygen-containing groups.The maximum adsorption amount of PVA/SA/BGO double-network hydrogel toward CV is 460.21 mg·g^(-1),and the adsorption process is in accordance with the Langmuir adsorption model and the pseudo-second-order kinetics model.