Experimental design of the photo-self-Fenton/PMS synergistic system for emerging pollutants treatment under natural light
[Objective]g-C3N4 is a photocatalytic material that can be prepared easily at low cost and exhibits good stability.However,it has limitations,such as a small specific surface area and low efficiency in photogenerated carrier separation.The photocatalytic performance of g-C3N4 can be enhanced by modifying the microstructure of carbon nitride through morphology regulation,element doping,and heterostructure construction.At present,most studies on photocatalysis focus on simulating visible light for degradation experiments to investigate the catalyst's performance and influencing factors.However,limited studies have been conducted under natural light conditions that hamper the practicality of research findings.[Methods]Herein,Cl/S codoped carbon nitride was synthesized using a hydrothermal stripping method and combined with MoS2 to form MoS2/TCNCl-S composite material.Furthermore,it was loaded onto Al2O3 hollow spheres to prepare modified carbon nitride hollow sphere MoS2/TCNCl-S(P),enabling recycling of the composite material.Crystal phase composition and morphology of the catalyst were analyzed using SEM,TEM,UV-Vis spectroscopy,and XRD techniques.Moreover,the mechanism behind photogenerated carrier generation,recombination,and transport was investigated through I-T measurements as well as PL and EIS characterization methods.Furthermore,a photo-self-Fenton/PMS collaborative system was constructed under visible light conditions to evaluate TC degradation efficiency considering different TC concentrations,catalyst dosage,pH,and PMS concentration.This enabled the evaluation of the catalyst's performance and its influencing factors under natural light conditions.Radical quenching experiments and ESR operations contributed to the PMS collaborative system to analyze the reasons for the difference in free radical contribution and to summarize the mechanism of TC degradation in the process.[Results]The results demonstrate that the photo-self-Fenton/PMS system achieved an 80％degradation rate of TC within 120 min,indicating the high feasibility of photocatalysis under natural light.The photo-self-Fenton/PMS collaborative system autonomously generated H2O2 upon PMS addition and enhanced the photocatalytic efficiency by approximately 30％,thereby addressing the limitations of traditional photo-Fenton technology requiring additional Fe2+ and H2O2.Furthermore,the incorporation of PMS enhanced the anti-interference capability of the photocatalytic system,thereby minimizing the effect of pollutant concentration,pH,and other factors on its performance.TCNCl-S,a double-doped carbon nitride nanotube cluster of Cl/S with a diameter of approximately 69 nm,was synthesized via the hydrothermal stripping method.Subsequently,the MoS2/TCNCl-S composite was formed,combining MoS2 with TCNCl-S(P).To achieve an efficient degradation of TC under visible light,a photo-self-Fenton/PMS collaborative reaction system was constructed.[Conclusions]This study achieved efficient degradation of TC under visible light through a highly efficient carbon nitride composite catalyst.By investigating free radical production and transformation mechanisms,it is observed that PMS introduction promotes increased·O2 generation in synergy with new radicals such as 1O2 and SO4-,ultimately strengthening TC degradation.This experiment design involves a comprehensive application of basic knowledge and theoretical practice,such as the principle of environmental catalysis and degradation of water-based environmental pollutants,which helps strengthen students'understanding of the textbook content and improve their practical operation ability.
natural lightemerging pollutantsmodified carbon nitride hollow spheresphoto-self-Fenton/peroxymonosulfate(PMS)synergistic system
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