还原氧化石墨烯/粘胶基钒酸铋光催化材料的制备及其性能

针对钒酸铋(BiVO₄)光催化效率低、难回收的缺点,利用硅烷偶联剂KH-560和氧化石墨烯(GO)依次对粘胶非织造布改性,再利用搅拌水热法在其表面生长BiVO₄制备还原氧化石墨烯(RGO)/粘胶基BiVO₄光催化材料。采用扫描电子显微镜、X射线衍射、X射线光电子能谱和紫外-可见吸收光谱对材料进行了表征,并研究了RGO/粘胶基BiVO₄材料的光催化活性、重复使用性能和光催化机制。结果表明:BiVO₄成功负载在RGO/粘胶非织造布表面,得到了RGO/粘胶基BiVO₄光催化材料;在1 kW氙灯照射下,90 min内对活性黑5脱色率达到95%以上,重复5次后仍达到92%以上;自由基捕捉实验表明,光生空穴、超氧自由基和羟基自由基参与了光化学反应,其中羟基自由基的作用最大。

Preparation and property of reduced graphene oxide/viscose-based BiVO4 photocatalyst

In order to overcome the disadvantages of low photocatalytic efficiency and recyclability of BiVO₄, silane coupling agent KH-560 and graphene oxide (GO) were used to modify the viscose nonwoven fabrics, then BiVO₄ was grown on its surface by stirring hydrothermal method to prepare reduced graphene oxide (RGO)/viscose-based BiVO₄ photocatalyst. The materials as prepared were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and ultraviolet visible absorption spectroscopy. The photocatalytic activity, reusability and photocatalytic mechanism of RGO/viscose based BiVO₄ photocatalyst for C.I. Reactive Black 5 decolorization were studied. The results show that BiVO₄ is successfully loaded on RGO/viscose nonwovens and consequently RGO/viscose-based BiVO₄ photocatalytic materials are obtained. Under the irradiation of 1 kW xenon lamp, the decolorization rate can reach up to 95% in 90 min, and over 92% is preserved even after five recycles. Furthermore, free radical capture experiments show that photogenerated hole, superoxide radical and hydroxyl radical participate in the photocatalytic reaction, and among which the hydroxyl radical is the most important.