Cagnetta Giovanni,Liu Han,Zhang Kunlun,Huang Jun,Wang Bin,Deng Shubo,Wang Yujue,Yu Gang
Brominated organic pollutants are considered of great concern for their adverse effect on human health and the environment, so an increasing number of such compounds are being classified as persistent organic pollutants (POPs). Mechanochemical destruction is a promising technology for POPs safe disposal because it can achieve their complete carbonization by solvent-free high energy ball milling at room temperature. However, a large amount of co-milling reagent usually is necessary, so a considerable volume of residue is produced. In the present study a different approach to POPs mechanochemical destruction is proposed. Employing stoichiometric quantities of Bi 2 O 3 or La 2 O 3 as co-milling reagent, brominated POPs are selectively and completely converted into their corresponding oxybromides (i.e. BiOBr and LaOBr), which possess very peculiar properties and can be used for some actual and many more potential applications. In this way, bromine is beneficially reused in the final product, while POPs carbon skeleton is safely destroyed to amorphous carbon. Moreover, mechanochemical destruction is employed in a greener and more sustainable manner.
A key challenge in developing efficient ammonia synthesis photocatalysts lies in preserving the reduction potential of photogenerated electrons, minimizing bulk recombination losses, and increasing the number of active electrons. In this study, a facet-oriented Cu 2 O@LaOBr photocatalyst was constructed by integrating heterojunction design with crystal plane control. Multiple characterizations confirmed the oriented loading of Cu 2 O onto the (1 1 0) facet of LaOBr. Photoelectrochemical tests revealed a high photocurrent response and low interfacial resistance for Cu 2 O@LaOBr(1 1 0), indicating enhanced charge separation and transfer. The catalyst achieved a nitrogen reduction rate of 378.24 μmol·g −1 ·h −1 —8.9, 5.2, and 2.4 times higher than LaOBr, Cu 2 O, and Cu 2 O@LaOBr-R, respectively—demonstrating the efficacy of facet-oriented loading in boosting photocatalytic performance. Through photo-deposition, ESR, and DFT studies, a synergistic mechanism was elucidated: the built-in electric field (BIEF) between crystal planes concentrates electrons on LaOBr(1 1 0), while the interphase BIEF and Z-scheme heterojunction further enhance electron separation and transfer. Together, these effects promote efficient nitrogen reduction on the active surface.
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