|
| g-C3N4/TiO2可见光催化降解磺胺甲恶唑的研究 |
| Study on catalytic degradation of sulfamethoxazole with g-C3N4/TiO2 under visible light irradiation |
| 投稿时间：2022-12-25 |
| DOI：10.13259/j.cnki.eri.2024.01.001 |
| 中文关键词: g-C3N4/TiO2 光降解 仿生生态系统 抗生素 降解机制 |
| 英文关键词:g-C3N4/TiO2 photodegradation bionic ecosystem antibiotics degradation mechanism |
| 基金项目:国家自然科学基金(U2240205)；上海理工大学科技发展项目(2018KJFZ117) |
|
| 摘要点击次数: 1570 |
| 全文下载次数: 1921 |
| 中文摘要: |
| 以TiO2颗粒和三聚氰胺为原料，采用高温煅烧法制备g-C3N4/TiO2复合光催化材料，研究其对仿生生态系统中磺胺类抗生素的去除效果。利用扫描电子显微镜（SEM）、X射线衍射仪(XRD)、傅里叶变换红外光谱仪（FTIR）、紫外可见分光光度计（UV-vis DRS）对g-C3N4/TiO2进行表征，并研究在可见光条件下g-C3N4/TiO2对溶液中磺胺甲恶唑（SMX）的光催化降解效果。结果表明，g-C3N4/TiO2具有良好的光催化活性，在可见光照射下，当g-C3N4/TiO2投加量为0.2 g·L-1时，对初始质量浓度为200 μg·L-1的SMX的去除率可达84.3%。在相同条件下，而g-C3N4和TiO2只能分别去除21.0%和16.0%的SMX，同时在仿生系统中12.37 g·m-2 g-C3N4/TiO2可以去除95.35%的SMX。通过质谱分析推测，SMX可能的降解路径分别为S—N键断裂、C—N键断裂、S—C键断裂、SMX的羟基化和SMX上氨基的硝化反应，两种可能的中间产物分别为对氨基苯磺酰胺和3-氨基-5-甲基异恶唑。 |
| 英文摘要: |
| The composite photocatalytic materials of g-C3N4/TiO2 were prepared with high temperature calcination method using TiO2 particles and melamine as feedstocks, and the removal of sulfonamide antibiotics by g-C3N4/TiO2 in bionic ecosystem was studied. g-C3N4/TiO2 was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and ultraviolet-visible spectrophotometer (UV-vis DRS). The photocatalytic degradation of sulfamethoxazole (SMX) in solution by g-C3N4/TiO2 under visible light irradiation was studied. Results show that g-C3N4/TiO2 has good photocatalytic activity. Under visible light irradiation, the removal rate of SMX with its initial concentration of 200 μg·L-1 can reach 84.3% at the dosage of g-C3N4/TiO2 = 0.2 g·L-1. Under the same conditions, g-C3N4 and TiO2 can only remove 21.0 % and 16.0 % of SMX, respectively, while 95.35 % of SMX can be removed in the bionic system at the dosage of g-C3N4/TiO2 = 12.37 g·m-2. The possible degradation pathways of SMX are proposed according to mass spectrometry analysis including S—N bond cleavage, C—N bond cleavage, S—C bond cleavage, hydroxylation of SMX and nitration of amino groups in SMX. The two possible intermediates are p-aminobenzenesulfonamide and 3-amino-5-methylisoxazole. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
