The step-like scheme (S-scheme) heterojunction photocatalyst, which possess an improved electric field, intimate interfacial contact and reasonable energy band structure, is one of the most optimal ways to solve the wastewater problem caused by residual antibiotics. Herein, a new type of S-scheme 0D/2D CoZrO/g-CN (CZO/CN) heterojunction photocatalyst was prepared via an ultrasonic assisted hydrothermal method and used as photocatalyst to degrade tetracycline (TC, 20 mg/L, 100 mL). Compared to pure CN and CZO, the CZO/CN with the optimal design proportion (30CZO/CN) demonstrates the outstanding photocatalytic efficiency for TC degradation under visible-light irradiation, with the degradation rate being 94.8 % within 180 min at pH 5.0. Moreover, the 30CZO/CN exhibits superior stability, which still eliminated 90 % of TC after five times cycle runs. Furthermore, the S-scheme mechanism of photocatalytic TC removal by CZO/CN is proposed by XRD, FT-IR, XPS, UV–Vis DRS and PL analysis, which summarized that the enhanced photocatalytic activity of CZO/CN was mainly ascribed to its larger specific surface area, available light absorption region and appropriate bandgap width, dominated by the S-scheme pattern. This study presents a novel S-scheme g-CN-base heterojunction photocatalyst can effectively treat wastewater and provides design ideas for other heterojunctions.

中文翻译：

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增强四环素可见光催化活性的S型0D/2D Co2ZrO5/g-C3N4异质结光催化剂的合成

阶梯式（S型）异质结光催化剂具有改善的电场、紧密的界面接触和合理的能带结构，是解决残留抗生素引起的废水问题的最佳途径之一。在此，通过超声波辅助水热法制备了一种新型S型0D/2D CoZrO/g-CN（CZO/CN）异质结光催化剂，并用作降解四环素的光催化剂（TC，20 mg/L，100 mL） 。与纯CN和CZO相比，最佳设计配比（30CZO/CN）的CZO/CN在可见光照射下表现出优异的光催化降解TC效率，在pH 5.0下180 min内降解率为94.8%。此外，30CZO/CN表现出卓越的稳定性，在五次循环运行后仍然消除了90%的TC。此外，通过 XRD、FT-IR、XPS、UV-Vis DRS 和 PL 分析，提出了 CZO/CN 光催化去除 TC 的 S 型机理，总结出 CZO/CN 光催化活性的增强主要归因于其较大的比表面积、可用的光吸收区域和适当的带隙宽度，以S型图案为主。该研究提出了一种新型S型g-CN基异质结光催化剂，可以有效处理废水，并为其他异质结提供设计思路。