In the past few years, it was discovered that Ni(OH)2 is an effective photocatalyst for CO2 as a chemical fuel catalyst. Ni(OH)2 nanosheets were prepared by simple wet treatment and electric transformation of nickel‐containing wastewater. The Ni(OH)2/Ce(OH)4 hybrid nanosheets were prepared by Ce doping experiment, and Ni/Ce oxide was prepared by calcination with Ni(OH)2/Ce(OH)4 composite nanosheets. Finally, Ce(OH)4 was prepared by electroconversion with CeCl3 ⋅ 7H2O as raw material, and all the samples were used as CO2 photocatalysts for performance comparison. The diameter and thickness of Ni(OH)2/Ce(OH)4 and NiO/CeO2 nanocrystals are about 1∼50 nm and 1∼10 nm, respectively. The BET‐specific surface area is calculated to be 205.93 m2/g (Ni(OH)2/Ce(OH)4) and 18.93 m2/g (NiO/CeO2). During CO2 photoreduction, bare Ce(OH)4 can only produce CO (1.32 μmol after 4 h). The methane yield of Ni(OH)2/Ce(OH)4 is 11.435 μmol after 4 h, while the CO yield increases to 21.515 μmol after 4 h. Compared with the oxide NiO/CeO2, the electrolytic product Ni(OH)2/Ce(OH)4 showed a higher photocatalytic activity for CO2 reduction, which is attributed to the larger specific surface area of the precursor. We believe this work provides a potential approach for treating nickel‐containing electroplating wastewater to prepare highly efficient and selective CO2 reduction photocatalysts.
Antimony nanoparticles, whose surfaces were modified by alkyl phenol polyoxyethylene ether (OP-10), were used as one of the types of lubricating additives in liquid paraffin (LP). The tribological properties of antimony nanoparticles as lubricating additives were evaluated and compared with those of pure LP on a four-ball test machine. The morphology and chemical composition of the worn surface were investigated and analyzed by using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the additives can obviously improve the anti-wear and friction reducing properties of LP, which are better under high friction load. The double-layer crystal structure of antimony can be separated and glided along the cleavage plane by a friction-shear force and a normal load, respectively. The separating and gliding of antimony can form a physical adsorption film, which can separate the friction surface to avoid direct contact of the friction surface and play an important role in improving the anti-wear and friction reducing properties.
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