We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg al-loy.This composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltri-methoxysilane(PFDTMS)using a simple immersion method.The successful intercalation of tungstate into the LDH phase and the fol-lowing formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectro-scopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion experiments.The results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDH-W film,with no apparent signs of corrosion after exposure to 3.5wt％NaCl solution for 15 d.Furthermore,the LDH-W/PFDTMS coat-ing demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency tests.These results offer valuable insights into preparing superhydrophobic and corrosion-res-istant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.
AgCl/Ti3C2@TiO2 ternary composites were prepared to form a heterojunction structure between AgCl and TiO2 and introduce Ti3C2 as a cocatalyst. The as-prepared AgCl/Ti3C2@TiO2 composites showed higher photocatalytic activity than pure AgCl and Ti3C2@TiO2 for photooxidation of a 1,4-dihydropyridine derivative (1,4-DHP) and tetracycline hydrochloride (TCH) under visible light irradiation (? > 400 nm). The photocatalytic activity of AgCl/Ti3C2@TiO2 composites depended on Ti3C2@TiO2 content, and the catalytic activity of the optimized samples were 6.9 times higher than that of pure AgCl for 1,4-DHP photodehydrogenation and 7.3 times higher than that of Ti3C2@TiO2 for TCH photooxidation. The increased photocatalytic activity was due to the formation of a heterojunction structure between AgCl and TiO2 and the introduction of Ti3C2 as a cocatalyst, which lowered the internal resistance, sped up the charge transfer, and increased the separation efficiency of photogenerated carries. Photogenerated holes and superoxide radical anions were the major active species in the photocatalytic process.
