Preparation Of The BiOX(X=Cl,Br,I) Films And Its Adsorption And Photocatalysis Performance

The removal of organic dyes have been highly highlighted and concerned due to their high toxicity for environment and damages for public health, thus, there is a urgent need to treat dye contaminated water. Recently, photocatalysis and absorption, as a kind of environmentallyfriendly method, has attracted great attention in recent years. BiOX(X = Cl, Br, I), a ternary semiconductor materials, benefiting from its specially layered structure and highly chemical stabilities, shows a plenty of room in pollution management application. However, the routine method for BiOX(X = Cl, Br, I) preparation is solvothermal, the as-prepared samples is generally powder material which makes it difficult to recycle and reuse in dye wastewater treatment then leads to an increasing cost. This paper is committed to the preparation of immobilized BiOX(X = Cl, Br, I)and study the photocatalytic properties and adsorption properties of the prepared BiOX(X = Cl, Br, I)films for organic dyes. Two different methods were used to prepare Bi OX(X = Cl, Br, I)films. The as-prepared BiOX(X = Cl, Br, I)films were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), and other methods. The main results were summarized as follows:(1)A facile one-step method was developed to fabricate BiOCl film on Cu substrate by simply dipping the Cu substrate in the mixed solution containing HCl, glycol, H2O2 and BiCl3. The adsorption capacity was investigated by adsorption of RhB and Congo red(CR). The adsorption isotherm data of RhB and CR fitted into Langmuir, which showed the maximum adsorption capacity 1667 mg/g of RhB, and 1429 mg/g of CR, respectively. Reusability test demonstrated that the recycle rates for RhB and CR were about 95% and 75% after five cycles, respectively. Finally, the possible adsorption mechanism between adsorbent and dye was also examined by Fourier transform infrared(FTIR) and X-ray photoelectron spectroscopy(XPS) analysis. The adsorption mechanism revealed that hydrogen bond played a key role.(2)BiOX(X = Cl, Br, I)films immobilized on the FTO conductive glass were successfully prepared through a simple electrodeposition method. The as-prepared BiOX(X = Cl, Br, I)films composed by sheet. Photocatalytic performance, recyclability and stability of the obtained films were investigated by degradation of rhodamine B. Under UV-visible light irradiation, the photocatalysis efficiency of BiOCl and BiOI was 100% and 99% after 3 hours, respectively. And the photocatalysis efficiency of BiOI was 30%. The as-prepared BiOCl film and BiOBr film for Rhodamine B had a good photocatalytic activity, degradation efficiency declines insignificantly after 5 cycles.