No abstract

A new type of poly pyrrole/graphene oxide/bismuth vanadate (PPy/GO/BiVO4) ternary nanocomposite with excellent visible light-driven photocatalytic degradation performance was prepared by the traditional hydrothermal method. The photocatalyst samples were characterized and analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). Under visible light irradiation, the photocatalytic activity of the samples in the degradation of Rhodamine B (RhB), which was used to simulate organic dye pollutants in the real natural environment, was detected. The experimental results demonstrated that the photocatalytic degradation performance of PPy/GO/BiVO4 was reinforced after loading GO and PPy. Among all the photocatalyst samples with different PPy content, the PPy/GO/BiVO4 nanocomposite containing 5% PPy showed the highest photocatalytic activity. The stability test suggested that the nanocomposite remained stable even after four cycles of photocatalytic degradation of RhB. As a novel type of visible light-driven photocatalyst, PPy/GO/BiVO4 can be utilized to degrade pollutants in waste water.

Hot dip plating is a main methods of iron and steel protection, but the traditional hot dip galvanizing products can not meet the actual needs. The addition of aluminium (Al), magnesium (Mg), rare earth (Re) and other alloying elements in zinc solution has become a hot research topic. In order to obtain multicomponent alloy coating with high corrosion resistance, a new type of hot dip galvanizing coating was obtained by adding Re yttrium(Y) into Zn-Al-Mg plating bath. The influence of adding elements Re Y, Al and Mg on the corrosion resistance of hot dipped galvanized coatings was studied by conducting immersion tests, salt spray tests and electrochemical tests (Tafel, EIS), and the anticorrosion mechanism of the coatings was primarily explored. The results showed that rare earth yttrium can improve the corrosion resistance of hot dipped galvanizing, and Zn-2%Al-1%Mg-0.08%Re alloy coating has the best corrosion resistance. Hopefully, the present work uses the current hot dip galvanizing production equipment and technology, the established galvanizing technology can be applied in industry.

In the text, a new fluorescent probe based on rhodamine spirolactam ring was designed and synthesized. Rhodamine-like derivatives have not only good response speed and luminous performance, but also have a special switch type structure, which can specifically recognize responsive metal ions. In the paper, Rh-TEF, a 6G derivative of rhodamine, was synthesized by condensation reaction, the synthesized fluorescent probe was successfully used for solutions sample detection.

Z-scheme heterojunction photocatalytic nanomaterial designs have attracted attention due to their high catalytic performance. Deep eutectic solvents (DESs) have been used as green, sustainable media, acting as solvents and structure inducers in the synthesis of nanomaterials. In this work, a novel visible-light-absorption-enhanced bismuth vanadate/bismuth oxychloride/sulfur, nitrogen co-doped graphene quantum dot (BiVO4/BiOCl/S,N-GQDS) heterojunction photocatalyst was prepared in a deep eutectic solvent. The photosynthetic activity of the BiVO4/BiOCl/S,N-GQDS composite was determined by the photocatalytic degradation of rhodamine B (RhB) under visible-light irradiation. The results showed that the highest photocatalytic activity of BiVO4/BiOCl/S,N-GQDS was achieved when the doping amount of S,N-GQDS was 3%, and the degradation rate of RhB reached 70% within 5 h. The kinetic and photocatalytic cycles showed that the degradation of Rhb was in accordance with the quasi-primary degradation kinetic model, and the photocatalytic performance remained stable after four photocatalytic cycles. Ultraviolet–visible diffuse reflectance (UV-DRS) and photoluminescence (PL) experiments confirmed that BiVO4/BiOCl/S,N-GQDS ternary heterojunctions have a narrow band gap energy (2.35 eV), which can effectively improve the separation efficiency of the photogenerated electron–hole pairs and suppress their complexation. This is due to the construction of a Z-scheme charge process between the BiVO4/BiOCl binary heterojunction and S,N-GQDS, which achieves effective carrier separation and thus a strong photocatalytic capability. This work not only provides new insights into the design of catalysts using a green solvent approach but also provides a reference for the study of heterojunction photocatalytic materials based on bismuth vanadate, as well as new ideas for other photocatalytic materials.