A novel and simple in situ synthetic strategy was used to fabricate CdS/g-C 3 N 4 hybrid nanocomposite catalysts with visible-light-driven photocatalytic activity from cadmium-containing carbon nitride compounds. X-ray diffraction measurements, high-resolution transmission electron microscopy images, and Fourier transform infrared spectra showed heterojunctions with a close interface between the g-C 3 N 4 and the CdS nanoparticles and nanorods in the composite. Ultraviolet visible diffuse reflectance spectra exhibited a red shift that further presented the CdS in the polymer g-C 3 N 4 skeleton, which allowed the efficient utilization of the solar spectrum for creating photogenerated electrons and holes. The photoluminescence spectra of the nanocomposites suggested charge transfer from g-C 3 N 4 to CdS. The photocurrent intensity of hybrid nanocomposites was 2.3 times than that of pure g-C 3 N 4 sample, and photocatalytic activity for the photodegradation of methyl orange was 2.5 times, and hydrogen evolution reaction was 2.8 times. Enhanced photocatalytic activity and photocurrent for the CdS/g-C 3 N 4 hybrid nanocomposites were achieved.

： (3-Mercaptopropyl)triethoxysilane (MPTES) was hydrolyzed in acid or basic ethanol-water solution. Fourier transform infrared (FTIR) spectroscopy was used to characterize the structures of MPTES solutions and MPTES films that formed on copper. The corrosion protective performance of the MPTES films was evaluated by polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that MPTES was hydrolyzed to a certain extent with the formation of Si-OH groups in an acid silane solution and the degree of hydrolysis increased during the aging process of the solution at room temperature. However, a small amount of MPTES was hydrolyzed in the basic silane solution and a large number of SiOCH2CH3 groups were found in it. More Si -O -Si bonds were formed in the film obtained from the acid silane solution compared to the film formed in the basic silane solution. The polarization curves showed that the MPTES films could decrease the corrosion current density of the copper electrodes; the protection efficiencies of the films were 90.3% (for the acid film) and 79.2% (for the basic film). EIS plots indicated that the basic film lost its protective capability after 24 h of immersion in 3.5% (w) NaCl solution while the acid film showed increasing impedance.

： Polypyrrole (PPy) was chemically synthesized from pyrrole using sodium p-toluenesulfonate as a doping agent and ferric chloride as an oxidant on the surface of the AZ31 magnesium alloy. Fourier transform infrared (FTIR) spectroscopy was used for structural characterization of the PPy film. The corrosion behavior of the PPy coated AZ31 Mg alloy was studied using an electrochemical polarization test and electrochemical impedance spectroscopy (EIS). Scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDS) were used to observe the surface morphology and for elemental analysis of the film, respectively. The PPy film showed a certain corrosion inhibition on the AZ31 magnesium alloy. Silane pretreatment can improve the corrosion protection performance of the Mg/PPy system causing a positive shift of the corrosion potential by 110 mV and a decrease in the corrosion current density by two orders of magnitude compared with that of AZ31 Mg alloy.