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

Preparation and property of reduced graphene oxide/viscose-based BiVO_(4) photocatalyst

针对钒酸铋(BiVO_(4))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BiVO_(4)制备还原氧化石墨烯(RGO)/粘胶基BiVO_(4)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BiVO_(4)材料的光催化活性、重复使用性能和光催化机制。结果表明:BiVO_(4)成功负载在RGO/粘胶非织造布表面,得到了RGO/粘胶基BiVO_(4)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。

In order to overcome the disadvantages of low photocatalytic efficiency and recyclability of BiVO_(4),silane coupling agent KH-560 and graphene oxide(GO)were used to modify the viscose nonwoven fabrics,then BiVO_(4) was grown on its surface by stirring hydrothermal method to prepare reduced graphene oxide(RGO)/viscose-based BiVO_(4) 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 BiVO_(4) photocatalyst for C.I.Reactive Black 5 decolorization were studied.The results show that BiVO_(4) is successfully loaded on RGO/viscose nonwovens and consequently RGO/viscose-based BiVO_(4) 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.