氧化石墨烯量子点-球状氮化碳催化剂的制备及其光催化降解磺胺氯哒嗪
- Preparation of Graphene Oxide Quantum Dot-Spherical Carbon Nitride Catalyst and Its Photocatalytic Degradation of Sulfamethoxazole
- 基金项目：浙江省自然科学基金(LQN25B070001)；国家自然科学基金(22476183)
- 摘要：通过溶剂热和高温煅烧法制备得到氧化石墨烯量子点-球状氮化碳(GOQDs-SCN)催化剂,通过SEM、TEM、XRD、FTIR、XPS、UV-Vis和EPR等测试方法对其进行表征,并将其用于活化PMS降解磺胺氯哒嗪(SCP),结果表明,当GOQDs的投料比为2%时,GOQDs-SCN对SCP的降解效果最佳.与g-C3N4和SCN相比,2%GOQDs-SCN光催化降解SCP的效果显著提升,在6 min内降解率达到99%,GOQDs-SCN的反应速率常数分别是SCN和g-C3N4的3.89倍和6.48倍.在酸性和中性条件下可获得最佳的SCP降解效果,碱性条件不利于SCP的降解.HCO3-对SCP的降解产生抑制作用,SO42-,H2PO4-,Cl-则不会产生抑制作用.通过自由基捕获实验,证明在光催化降解过程中起到主要作用的活性物种是1O2、?O2-和?OH.使用UPLC/HDMS检测了SCP降解过程中的产物并分析可能的降解历程.考察了2%GOQDs-SCN的循环使用性能,证明光催化材料具有良好的循环稳定性,应用前景良好.
- Abstract：The graphene oxide quantum dots-spherical carbon nitride (GOQDs-SCN) catalyst was synthesized through solvothermal and high-temperature calcination method. The catalysts were characterized by SEM, TEM, XRD, FTIR, XPS, UV-Vis, and EPR. GOQDs-SCN was used to activate PMS for the degradation of sulfachloropyridazine (SCP). The results revealed that the GOQDs-SCN catalyst with 2% GOQDs loading exhibited optimal degradation efficiency. The photocatalytic degradation effect of SCP by 2% GOQDs-SCN was significantly improved compared to both g-C3N4 and SCN, achieving 99% SCP degradation within 6 minutes. The reaction rate constants of 2%GOQDs-SCN were 3.89 and 6.48 times higher than those of SCN and g-C3N4, respectively. The best SCP degradation effect was achieved under acidic and neutral conditions, while alkaline conditions were less favorable for SCP degradation. HCO3- was identified as an inhibitor of SCP degradation, whereas SO42-, H2PO4-, and Cl- showed no significant inhibitory effects. Based on the results of radical trapping experiments, the primary reactive oxygen species responsible for photocatalytic degradation were 1O2, ?O2- and ?OH. UPLC/HDMS was used to detect the products of SCP degradation process and analyze the possible degradation process. The cyclic performance of 2% GOQDs SCN was investigated, demonstrating that the photocatalytic material has good cyclic stability and promising application prospects.
