钾掺杂氮化碳光催化剂制备及降解四环素的性能研究

Preparation of Potassium-doped Carbon Nitride Photocatalyst and Study on Its Performance in Degrading Tetracycline

高效催化剂设计与制备是光催化降解四环素(TC)的研究热点。以硫脲和溴化钾为原料,通过简单的一步煅烧法制备了钾掺杂石墨相氮化碳(K-C_(3)N_(4))光催化剂,并将其活化过硫酸氢钾降解四环素。考察了催化剂投加量、过硫酸氢钾用量、溶液初始pH值以及溶液初始浓度等因素对降解性能的影响。结果表明,最佳钾掺杂氮化碳(CN-K5)投加量为10 mg,过硫酸氢钾浓度为2 mmol/L,四环素溶液初始pH值为4,初始质量浓度为10 mg/L时去除效果最好,四环素去除率为86%。循环实验表明,CN-K5具有很好的光化学稳定性,具有广阔的工业应用前景。

The design and preparation of efficient catalysts is a research hotspot for photocatalytic degradation of tetracycline(TC).Using thiourea and potassium bromide as raw materials,a potassium-doped graphite phase carbon nitride(K-C_(3)N_(4))photocatalyst was prepared through a simple one-step calcination method,and it was activated by potassium hydrogen persulfate to degrade tetracycline.The effects of catalyst dosage,potassium hydrogen persulfate dosage,initial pH value of the solution,and initial concentration of the solution on the degradation performance were investigated.The results show that the optimal dosage of potassium-doped carbon nitride(CN-K5)is 10 mg,the concentration of potassium hydrogen persulfate is 2 mmol/L,the initial pH value of the tetracycline solution is 4,and the initial concentration is 10 mg/L,the removal rate of tetracycline was 86%.Cycle experiments show that CN-K5 has good photochemical stability.It has broad industrial application prospects.