Abstract:

Tetracycline residue in the environment will have chronic effects on aquatic organisms. Tetracycline is discharged into scenic water along with living water, affecting the water quality of scenic water. In this study, graphene-like (GBO) was prepared from orange peel powder as raw material and the electron transfer rate was increased by nitrogen doping optimization of GBO (NGBO). Using NGBO as solid state electron medium, Z-type ternary photocatalyst was constructed at g-C₃N₄/BIVO₄ interface. H₂O₂ oxide was introduced as oxidant on the basis of photocatalysis and the Z catalyst/photo-Fenton catalyst system was established. The photocatalytic degradation of TC over Z-type catalyst was studied by adding 10mg catalyst and 5mmol/L H₂O₂ into 50mL of 10mg/L tetracycline solution. The results indicated that the CN/NGBO/BV composite had the strongest photo-Fenton-like catalytic degradation ability of TC. Catalytic degradation of TC was enhanced as light and H₂O₂ contribute to the formation of more ·OH and ·O₂^- during catalytic degradation of TC systems, while experimental results showed synergy between photocatalysis and fenton-like catalysis.

Key words: Z-scheme catalyst, photo-Fenton, tetracycline, catalytic degradation

摘要：

环境中残留的四环素会对水生生物产生慢性影响，四环素随着生活水体排入景区水体，影响景区水中的水质，本研究采用煅烧法和水热法以橘子皮粉末为原材料制备类石墨烯（GBO），通过氮掺杂优化GBO（NGBO）提高其电子传输速率，将NGBO作为固态电子介质在g-C₃N₄/BiVO₄界面构建Z型三元光催化剂。通过在光催化基础上引入氧化剂H₂O₂，构建Z型催化剂/光类芬顿催化复合体系，将类芬顿催化降解技术和光催化技术相耦合。将10mg的催化剂和5mmol/L的H₂O₂加入50mL的10mg/L四环素溶液中，结果表明Z型催化剂光类芬顿催化降解TC的性能，在光照90min后，所制备的CN/NGBO/BV复合材料的光类芬顿催化降解TC能力最强。降解TC的催化能力得到提升的原因是光照和H₂O₂会促进催化降解TC体系中生成更多的·OH和·O₂^-，同时实验结果表明光催化技术与类芬顿催化技术存在相互协同作用。

关键词: Z型催化剂, 光芬顿, 四环素, 催化降解