Abstract Biomorphic TiO2 was successfully fabricated using maize straw as a template. The morphology and structure analysis revealed that the as-prepared TiO2 retained the original pore morphology of the maize straw material. The framework of the maize-straw-templated TiO2 (T-TiO2) consisted of a cubic grid structure derived from lamellar TiO2 nanosheets. The results of UV–vis diffuse reflectance spectra and PL spectra revealed that the C-doping derived from maize straw template promoted the photoresponse properties of TiO2. Efficient hybrid AOPs (advanced oxidation processes) combining T-TiO2 photo-catalytic oxidation with a Fenton-like reaction for TC oxidation was first investigated, and then, the synergetic degradation effect was discussed in this article. As a result, the synergistic operation of the UV/Fenton/T-TiO2 photocatalytic hybrid process exhibited significant activity towards the degradation of TC (50 mg/L) over a wide pH range of 3.0–9.0 with a remarkably low iron ion dosage (1 mM). Moreover, the degradation kinetics can be well fitted by the pseudo-first order model, where a kinetic constant of 0.09378 min−1 was achieved, substantially higher than those of the UV/Fenton/N-TiO2 (0.04419 min−1), UV/Fenton (0.03343 min−1), Fenton (0.0172 min−1), UV/H2O2 (0.01412 min−1), UV/T-TiO2 (0.00209 min−1) and UV (0.00027 min−1) systems. The high synergistic effect probably occurred because of (1) the high surface activity of T-TiO2 as photocatalyst, which yielded a remarkably enhanced optical absorption capacity for the lamellar structure, and (2) the efficient reduction of Fe3+ to Fe2+ by the photoinduced electrons from T-TiO2.

中文翻译：

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生物模板化 TiO2 UV-Fenton 系统对四环素降解的增强催化性能

摘要 以玉米秸秆为模板成功制备了生物形态TiO2。形态和结构分析表明，所制备的 TiO2 保留了玉米秸秆材料的原始孔隙形态。玉米秸秆模板化 TiO2 (T-TiO2) 的框架由源自层状 TiO2 纳米片的立方网格结构组成。UV-vis漫反射光谱和PL光谱的结果表明，玉米秸秆模板中的C掺杂促进了TiO2的光响应特性。首先研究了将 T-TiO2 光催化氧化与类芬顿反应用于 TC 氧化的高效混合 AOP（高级氧化工艺），然后在本文中讨论了协同降解效应。因此，UV/Fenton/T-TiO2 光催化混合过程的协同操作在 3.0-9.0 的宽 pH 范围内对 TC（50 mg/L）的降解表现出显着的活性，并且铁离子剂量非常低（1 mM）。此外，降解动力学可以通过伪一级模型很好地拟合，其中实现了 0.09378 min-1 的动力学常数，大大高于 UV/Fenton/N-TiO2 (0.04419 min-1)、UV /Fenton (0.03343 min-1)、Fenton (0.0172 min-1)、UV/H2O2 (0.01412 min-1)、UV/T-TiO2 (0.00209 min-1) 和 UV (0.00027 min-1) 系统。产生高协同效应的原因可能是（1）T-TiO2作为光催化剂的高表面活性，显着增强了层状结构的光吸收能力，