Orimolade Benjamin O, Idris Azeez Olayiwola, Feleni Usisipho, Mamba Bhekie
Institute for Nanotechnology and Water Sustainability (iNanoWS), College of Science, Engineering and Technology, University of South Africa, Florida Science Campus, Private Bag X6, Johannesburg, 1709, South Africa.
Environ Sci Pollut Res Int. 2023 Feb;30(9):23678-23690. doi: 10.1007/s11356-022-23866-0. Epub 2022 Nov 3.
Removal of pharmaceuticals in wastewater has been the focus of many research due to the recalcitrant nature and hazardous effects of these compounds. The photoelectrochemical degradation process has proven to be suitable to harness solar energy for the mineralization of organic compounds in wastewater. Herein, we report the application of BiOI/MnO heterostructured anode for the photoelectrochemical degradation of tetracycline hydrochloride in aqueous solution. The photoanode was prepared through electrodeposition technique and fully characterized through microscopic, spectroscopic and electrochemical techniques. The results showed that formation of p-n heterojunction between BiOI and MnO in the photoanode led to improved charge separation which was evident in improved optical and photoelectrochemical properties. The FTO-BiOI/MnO electrode attained a photocurrent density of 0.104 mA cm with applied potential of 1.0 V (vs Ag/AgCl) which was almost double that of pristine BiOI suggesting efficient charge separation. The heterostructured photoanode achieved 94% removal of tetracycline hydrochloride after 120 min through the PEC degradation process with 61% mineralization efficiency. The electrode showed good reusability and stability with 92% PEC removal after eight cycles. Hence, the FTO-BiOI/MnO has a great potential as anode for PEC wastewater treatments.
由于这些化合物具有难降解性和有害影响，废水中药物的去除一直是许多研究的重点。光电化学降解过程已被证明适用于利用太阳能对废水中的有机化合物进行矿化。在此，我们报道了BiOI/MnO异质结构阳极在水溶液中对盐酸四环素的光电化学降解中的应用。通过电沉积技术制备了光阳极，并通过显微镜、光谱和电化学技术对其进行了全面表征。结果表明，光阳极中BiOI和MnO之间形成的p-n异质结导致电荷分离得到改善，这在光学和光电化学性能的改善中很明显。FTO-BiOI/MnO电极在1.0 V（相对于Ag/AgCl）的外加电势下获得了0.104 mA cm的光电流密度，几乎是原始BiOI的两倍，表明电荷分离效率高。通过PEC降解过程，异质结构光阳极在120分钟后实现了94%的盐酸四环素去除率，矿化效率为61%。该电极在八个循环后具有良好的可重复使用性和稳定性，PEC去除率为92%。因此，FTO-BiOI/MnO作为PEC废水处理的阳极具有很大的潜力。
