氧化石墨烯/纤维素/氧化锌水凝胶的制备 及其吸附-光催化性能

采用水热法制备环境友好型氧化石墨烯/纤维素/氧化锌水凝胶复合材料, 研究了该复合材料对亚甲基蓝 (methylene blue, MB) 的吸附-光催化降解性能。利用扫描电子显微镜、X 射线衍射等对复合水凝胶材料进行结构表 征。结果表明, 氧化石墨烯的引入抑制了氧化锌的团聚, 同时与纤维素结合增大了表面积, 有助于固定光催化剂以 及能够与污染物更好地结合。水凝胶独特的多孔结构具有很好的吸附效果, 将其作为光催化剂, 经500 W 氙灯照射 300 min 基本可将MB 分子完全降解。经过5 次循环使用后水凝胶的形状与第1 次使用时外观形状基本相同, 同时 催化效率也没有明显降低。因此, 制备的石墨烯/纤维素/氧化锌可作为一种环保、稳定、易回收的光催化剂和吸附 剂用于去除MB, 该水凝胶在块状催化剂降解染料废水中具有广阔的应用前景。

Preparation of Graphene Oxide/Cellulose/Zinc Oxide Hydrogels and Study on Its Photocatalytic Properties

An environmentally friendly graphene oxide/cellulose/zinc oxide photocatalytic adsorption hydrogel was prepared by hydrothermal method for the photocatalytic degradation of methylene blue (MB). The structure of composite hydrogel was characterized by SEM and XRD. The results show that the introduction of graphene oxide inhibits the agglomeration of zinc oxide, while the combination with cellulose increases the surface area, which helps to immobilize the photocatalyst and enables better binding with pollutants. The unique porous structure of the hydrogel has a good adsorption effect, and the combined photocatalyst exhibits an excellent MB degradation effect under 500 W xenon lamp irradiation in 300 min. After five cycles, the shape of the hydrogel is not much different from the first, and the catalytic effect is not significantly reduced. Therefore, the prepared graphene oxide/cellulose/zinc oxide hydrogel can be used as an environmentally friendly, recyclable and stable photocatalyst and adsorbent for MB removal. The green hydrogel has broad potential in the degradation of dye wastewater by bulk catalysts application prospects.