The Regulation Of Semiconductor Photocatalyst And Its Degradation Performance

Cu₂O octahedral microcrystal,Bi₂MoO₆/multi-walled carbon nanotube?MWCNT?and MWCNT/CdS-diethylenetriamine?DETA?hybridthe was prepared by a simple hydrothermal synthesis method.studied the photocatalytics performance of visible light degradation under the LED light,and obtains the following results:1.Cu2 O octahedral microcrystal was successfully synthesized by a facile one-step reaction at relatively low temperature of 96°C.The morphology,chemical composition,crystal structure and optical properties were characterized by field emission scanning electron microscopy?FESEM?,X-ray diffraction?XRD?,energy dispersive spectrometry?EDS?and UV–vis diffuse reflectance spectroscopy?DRS?.The results indicated that the size of Cu2 O octahedral particles is 1.5–2 ?m and the samples are very pure.In addition,the photocatalytic performance of samples was evaluated by the cycling degradation of methylene blue?MB?under 410 nm light emitting diode?LED?irradiation.Cu2 O exhibited efficient and stable photocatalytic activity,and the rate constant for the degradation of MB photocatalyzed by Cu2 O is 7.7 times more than that of P25 TiO2.2.Bi₂MoO₆/MWCNT hybrid was prepared through a facile hydrothermal process.High resolution transmission electron microscopy?HRTEM?,X-ray diffraction?XRD?,UV–vis diffuse reflectance spectroscopy?DRS?and N2 adsorption–desorption isotherms were used to investigate the morphology,crystal structure,optical properties and specific surface area of Bi₂MoO₆/MWCNT nanocomposite.It was shown that Bi₂MoO₆ nanoparticles were well-deposited on the outer surface of Bi₂MoO₆/MWCNT.Photocatalytic properties of as-prepared photocatalysts were investigated under 410 nm LED light irradiation for photodegradation of methylene blue.The corresponding the apparent pseudo-first-order rate constant kapp of Bi₂MoO₆/MWCNT is 0.087 min^-1,which is 4.4 times and 17.4 times more than that of pure Bi₂MoO₆ and P25 photocatalyst,respectively.Moreover,photo-degradation mechanism of Bi₂MoO₆/MWCNT was provided.3.Designing high performance functional nanomaterials by tuning their dimension atnanoscale and constructing novel interface has been a hot topic in recent years.In this work,MWCNT/CdS-DETA composite photocatalyst was synthesized via hydrothermal method.The structure,morphology,optical property and core level analysis of MWCNT/CdS-DETA nanocomposite were characterized by X-ray diffraction?XRD?,high-resolution transmission electron microscopy?HRTEM?,energy-dispersive X-ray spectroscopy spectra?EDS?,UV-Vis diffuse reflectance spectroscopy?DRS?and X-ray photoelectron spectrum?XPS?.CdS-DETA can be uniformly dispersed on the surface of MWCNT.Photocatalytic properties of as-prepared photocatalysts were investigated under 410 nm LED light irradiation for photodegradation of methylene bule?MB?.The kapp of MWCNT/CdS-DETA is 0.034 min^-1,which is about 6 times more than pure CdS-DETA.Photostability test indicated that MWCNT/CdS-DETA hybrid can be reused for degradation of organic pollution,suggesting the possible application of MWCNT/CdS-DETA hybrid is the most promising strategy for advanced photocatalyst material design.