In the photocatalytic conversion of CO2 to valuable chemicals under aqueous conditions, the selectivity and the product yield still present the most challenging issues. Against this backdrop, negatively charged water-soluble CdS nanocrystals were used to assemble with a positively charged dinuclear cobalt complex through electrostatic interactions. This assembly efficiently catalyzes the CO2-to-CO conversion under visible light, with a high selectivity of 95%, a high yield of 34.51 μmol of CO, and a large turnover number (TON) of 1380 based on the cobalt catalyst, all of which are record high values for a noble-metal-free visible-light-driven CO2 reduction system with a molecular catalyst in a fully aqueous medium.

CeO 2 nanotube with improved catalytic properties has been synthesized by a simple precipitation method using P123 triblock copolymer as surfactant. The prepared samples were characterized by X-ray diffraction, Scanning electron microscopy and BET surface area analysis. The activity of the material in catalytic ozonation degradation of organic pollutants in textile wastewater was investigated. The results showed that the presence of P123 could improve the crystallization of CeO 2 particles and slightly enlarge their specific surface area. The catalytic efficiency of the as-prepared CeO 2 nanotube with P123 adjusted is higher than that of CeO 2 nanotube with urea treatment. The spent catalyst could be recycled with only slight decline in catalytic activity.