Mo72Fe30/C3N4异质结催化剂光催化活化过一硫酸盐去除水中四环素OA

Graphite phase carbon nitride(g-C3N4)has attracted much attention in the field of photocatalytic activation of peroxymonosulfate(PMS)for pollutant removal due to its visible-light response ability,chemical stability and ease of preparation.However,due to the weak ability of photogenerated carriers separation and the limited surface sites for PMS activation,the photocatalytic activity needed to be improved.To address the above issues,herein,a polyoxometalates{Mo72Fe30}modified g-C3N4 heterojunction composite photocatalyst(Mo72Fe30/g-C3N4)was prepared via a simple thermal treatment method.The structure and surface characteristics of the composite were characterized,and the key influencing factors and mechanism of photocatalytic activation of tetracycline(TC)in water were systematic investigated.The results confirmed that Mo72Fe30 nanoparticles were successfully loaded onto the surface of g-C3N4.The results of degradation experiments showed that under the optimal conditions,the performance of the composite catalyst for degrading tetracycline(TC)was significantly improved compared with that of bare g-C3N4.After 15 minutes of reaction,the removal rate of TC reached 100%.The analysis of the relative position of the energy bands indicated that the heterojunction was S-Scheme type.The results of photoelectrochemical tests demonstrated that the introduction of{Mo72Fe30}could promote the separation of photogenerated carriers in g-C3N4.The results of radical quenching experiments and electron paramagnetic resonance(EPR)spectra indicated that the photocatalytic degradation of TC by the composite catalyst was the result of both radical and non-radical pathways.