Photoreduction of CO to CH over Efficient Z-Scheme -FeO/g-CN Composites.

A series of composite -FeO/g-CN (denoted as xFeCN with equal 5, 10, 15, and 20 of -FeO percentage in weight) was prepared by calcination and precipitation-impregnation methods. X-ray diffraction (XRD), Fourier transform infrared (FTIR), and X-ray photoelectron spectrometry (XPS) characterizations indicated the successful synthesis of Z-scheme FeCN composites. A red shift of the light absorption region was revealed by UV-vis diffuse reflectance spectroscopy (UV-DRS).

Arsenic contamination in groundwater and its possible sources in Hanam, Vietnam.

This study investigated the arsenic (As) level in groundwater, and the characteristics of aquifer sediment as related to the occurrence of As in groundwater in Hanam, Vietnam. The deposition and transport of As-containing substances through rivers were also examined. Arsenic concentrations in 88% of the groundwater samples exceeded the As limit for drinking water based on the WHO standards.