Abstract
According to the requirements for sustainable development, reclaiming fine chemicals from wastewater under mild conditions is an extremely significant line of research. A low-cost and high-efficiency polydentate chelate- and polymeric Co(ii)-based complex (Co-L)-loaded C3N4 photocatalyst (Co-L/C3N4) was constructed and used to convert aromatic mandelic acids in wastewater at room temperature. The BET specific surface area increased from 28 m2 g−1 to 68 m2 g−1, indicating its excellent absorptive character. The light absorption range of Co-L/C3N4 reached 650 nm, while the band energy reduced to 2.30 eV, which caused a significant enhancement in photocatalytic activity. The conversion of substituted mandelic acids was more than 90% due to the photoactivity of Co-L/C3N4. Time-resolved PL spectra indicated the remarkable separation of the photogenerated electron–hole pairs in Co-L/C3N4. Furthermore, the UV-vis and in situ FTIR spectra indicated the formation of aldehyde groups in the selective oxidation process, which provided support for the plausible catalytic mechanism.
Highlights
Introduction4-hydroxy-3-methoxy-5-methyl-benzaldehyde, have been used as pivotal intermediates in the pharmaceutical, printing and dyeing, pesticide, cosmetic, ame retardant and spice industries.[4,5,6,7] Typically, p-hydroxybenzaldehyde is mainly used to synthesize the cardio-cerebrovascular medicine esmolol, the oral antibiotic amoxicillin, the antibacterial sulfa synergist trimethoxy benzylamine, the anti-hepatic uke nitroiodophenol nitrile, among others.[8,9,10,11]
In the last few decades, rapid industrial progress, especially in the ne chemicals industry, has dramatically increased the occurrence of chemical-induced water pollution
4-hydroxyphenylglycolic acid (HPA) was employed as the model material to investigate the catalytic activity of the catalyst
Summary
4-hydroxy-3-methoxy-5-methyl-benzaldehyde, have been used as pivotal intermediates in the pharmaceutical, printing and dyeing, pesticide, cosmetic, ame retardant and spice industries.[4,5,6,7] Typically, p-hydroxybenzaldehyde is mainly used to synthesize the cardio-cerebrovascular medicine esmolol, the oral antibiotic amoxicillin, the antibacterial sulfa synergist trimethoxy benzylamine, the anti-hepatic uke nitroiodophenol nitrile, among others.[8,9,10,11]. Paper widely used in water splitting, the degradation of organic pollutants, CO2 conversion, selective organic synthesis, and so on.[23,24,25,26] In order to reclaim useful products from wastewater with low energy consumption and high efficiency, photocatalytic technology has attracted extensive attention due to its advantages of clean and environmentally friendly character derived from the use of solar energy.[27] Thanks to the advantageous non-polluting nature and low-energy consumption, heterogeneous photocatalysis has been widely used for the generation of clean energy and catalytic oxidation. The plausible mechanism for aromatic aldehyde production was investigated by employing in situ IR and UV-vis spectroscopy
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