In this study, a Z-type heterojunction photocatalyst CoWO 4 /CS/BiOCl-10 was constructed by hydrothermal synthesis for the efficient removal of norfloxacin (NOR) contaminants in water. X-ray photoelectron spectroscopy (XPS) combined with Fourier transform infrared spectroscopy (FT-IR) confirmed that the hydroxyl group in the chitosan (CS) molecule was bonded with the oxygen atom on the surface of CoWO 4 through hydrogen bonding to form a directional charge transport channel, which greatly improved the photocatalytic degradation efficiency of CoWO 4 /CS/BiOCl-10, and the degradation rate was as high as 98.30 % within 90 min under 300 W xenon lamp irradiation. Optoelectronic measurements show that the interfacial potential difference drives electrons to migrate along the Z-path. Density functional theory (DFT) and liquid chromatography-mass spectrometry (LC-MS) were used to identify intermediates in the NOR degradation process, revealing the degradation pathway of NOR through piperazine ring cleavage and defluorination. The kinetics of NOR degradation intermediates were revealed using two-dimensional correlation spectroscopy (2DCOS) techniques. Rice seed germination experiments have shown that the degraded NOR solution is virtually non-toxic, greatly reducing the environmental impact. This study provides a new strategy for the development of efficient photocatalytic systems through the synergistic regulation mechanism of hydrogen bonding and heterojunction.
Er-Ji Zhang,Tian-Song Deng,Yu-Chun Cheng,Li-Yong Liu,Jia-Fei Gao,Jiahong Wen,Xiaoyu Zhao,Jie Liu
Plasmonic multimetal materials, consisting of a plasmonic core and a catalytic shell in a core–shell structure, often exhibit excellent catalytic performances. Such excellent performances arise from the synergistic collaboration between the plasmonic core’s localized surface plasmon-excited hot electrons and the catalytically active sites of the catalytic shell. In this context, a trimetallic nanostructure was designed featuring gold nanobipyramids (AuNBP) with a silver–platinum alloy shell, serving as a plasmon-mediated photocatalyst for the degradation of methyl orange (MO) under visible and near-infrared light. By altering the concentrations of the surfactants hexadecyltrimethylammonium bromide (CTAB) and hexadecyltrimethylammonium chloride (CTAC), the resulting nanostructure can take on either island-like or shell-like morphology. In the model system of the photocatalytic reaction of MO, employing the synthesized nanoparticles as catalysts, the study investigated the reaction under xenon lamp illumination. The trimetallic nanostructure exhibited robust photocatalytic performances, surpassing AuNBP by a factor of 27.8. The transfer of plasmon resonance energy from AuNBP to the silver–platinum alloy layer, augmenting the generation of charge carriers, elucidates its outstanding photocatalytic performance. The obtained trimetallic nanostructure showcases promising potential applications in the realm of photocatalysis, contributing to the development of advanced plasmon-enhanced photocatalysts with enhanced efficiency and multifunctionality.
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