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首页> 外文期刊>RSC Advances >Inactivation of an urban wastewater indigenous Escherichia coli strain by cerium doped zinc oxide photocatalysis
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Inactivation of an urban wastewater indigenous Escherichia coli strain by cerium doped zinc oxide photocatalysis

机译：铈掺杂氧化锌光催化灭活城市废水中的天然大肠杆菌菌株

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Heterogeneous photocatalysis (HPC) is a subset of Advanced Oxidation Processes (AOPs) with potential future applications in water disinfection. Herein, a zinc oxide photocatalyst was doped with cerium at various atomic ratios ranging from 0 to 0.1 Ce?:?Zn. Keeping in mind that the application of HPC is often limited by its cost of use, a simple and easy to upscale method, that is the hydroxide induced hydrolysis of zinc nitrate in the presence of Ce ~(3+) followed by calcination at 300 °C, was used to synthesise the catalysts. The catalysts have been characterized by different techniques such as X-ray diffraction (XRD), UV-vis diffuse reflectance (UV-vis DRS) and Raman spectroscopy. XRD results showed that Ce ~(3+) ions were successfully incorporated into the ZnO lattice. UV-vis DRS spectra evidenced that Ce–ZnO samples present band-gap values of about 2.97 eV, lower than those of undoped ZnO (3.21 eV). These various photocatalysts, at 0.1 g L ~(?1) in saline 0.85%, were used to inactivate Escherichia coli previously isolated from an urban wastewater treatment plant. Higher atomic ratios of Ce in the ZnO lattice, as confirmed by XRD and Raman spectroscopy, showed significant improvements to the inactivation rate; the resulting recommended optimum cerium loading of 0.04?:?1 Ce?:?Zn gave multiple orders of magnitude higher rate of inactivation after 60 min of treatment when compared to un-doped ZnO. This optimum loading of cerium was faster than the de facto literature standard TiO _(2) -P25 tested under identical conditions.
机译：非均相光催化（HPC）是高级氧化过程（AOP）的子集，在水消毒中有潜在的未来应用。在此，氧化铈光催化剂以0〜0.1Ce 3 ∶δZn的各种原子比掺杂有铈。请记住，HPC的应用通常受到其使用成本的限制，这是一种简单且易于升级的方法，即在Ce〜（3+）存在下氢氧化物诱导的硝酸锌水解，然后在300°C下煅烧用C 1合成催化剂。催化剂已通过不同的技术进行了表征，例如X射线衍射（XRD），紫外可见漫反射（紫外可见DRS）和拉曼光谱。 XRD结果表明，Ce〜（3+）离子成功地掺入了ZnO晶格中。紫外可见DRS光谱证明，Ce–ZnO样品的带隙值约为2.97 eV，低于未掺杂的ZnO（3.21 eV）。这些各种光催化剂在0.85％的盐水中浓度为0.1 g L〜（？1），用于灭活先前从城市废水处理厂分离出的大肠杆菌。 XRD和拉曼光谱证实，ZnO晶格中Ce的原子比较高，这表明其失活速率有显着提高。与未掺杂的ZnO相比，在60分钟的处理后，建议的最佳铈负载量为0.04？：？1 Ce？：？Zn可使灭活速率提高多个数量级。铈的最佳负载比在相同条件下测试的事实上的文献标准TiO_（2）-P25更快。

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