Elisa Gaggero, Arianna Giovagnoni, Alessia Zollo, Paola Calza, M. Paganini
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引用次数: 0
摘要
本研究利用掺杂 N 的二氧化钛光催化剂对可见光的吸收增强的光降解性能,来消除一些具有代表性的新关注污染物(CECs)。采用水热法(HT)和溶胶-凝胶法(SG)合成了纯净的二氧化钛(TiO2)和掺氮二氧化钛(N-TiO2),使用 XRD 和紫外-可见光谱对它们进行了表征,并通过漫反射分析确定了它们的带隙。使用带有两种不同截止滤光片(λ > 340 nm 和 λ > 400 nm)的太阳模拟灯测试了它们对苯并三唑、双氯芬酸、磺胺甲噁唑和双酚 A 等难降解有机污染物混合物的光降解效率。对光催化性能的评估最初是在加标超纯水中进行的,随后又在波河水和水产养殖厂水等复杂程度越来越高的水基质中进行。对可见光(λ > 400 nm)的专门利用凸显了在二氧化钛光催化剂中引入掺杂剂的优势,因为这种改性可使材料对可见光产生反应,而原始二氧化钛对可见光的反应是不够的,而且通过溶胶-凝胶路线获得的材料效率更高。由于进行了掺杂,在超纯水和真水基质中的性能都得到了提高,这表明掺杂材料未来在该领域的应用潜力巨大。
Photocatalytic Degradation of Emerging Contaminants with N-Doped TiO2 Using Simulated Sunlight in Real Water Matrices
In the present work, the photodegradation performances of N-doped TiO2 photocatalysts with enhanced absorption of visible light were exploited for the abatement of some representative contaminants of emerging concern (CECs). Pristine TiO2 and N-TiO2 were synthesized using hydrothermal (HT) and sol–gel (SG) routes, they were characterized using XRD and UV-Vis spectroscopy, and their band gaps were determined via analysis in diffuse reflectance. Their photodegradation efficiency was tested on a mixture of recalcitrant organic pollutants, namely, benzotriazole, diclofenac, sulfamethoxazole, and bisphenol A, using a solar simulator lamp with two different cut-off filters (λ > 340 nm and λ > 400 nm). The evaluation of the photocatalytic performances was initially carried out in spiked ultrapure water and subsequently in aqueous matrices of increasing complexity such as Po River water and water coming from an aquaculture plant. The exclusive utilization of visible light (λ > 400 nm) highlighted the advantage of introducing the dopant into the TiO2 photocatalyst since this modification allows for the material to be responsive to visible light, which is not sufficient in the case of pristine TiO2 and the higher efficiency of materials obtained via the sol–gel route. Thanks to the doping, improved performance was obtained in both ultrapure water and real water matrices, indicating the potential of the doped material for future applications in the field.
期刊介绍:
Inorganics is an open access journal that covers all aspects of inorganic chemistry research. Topics include but are not limited to: synthesis and characterization of inorganic compounds, complexes and materials structure and bonding in inorganic molecular and solid state compounds spectroscopic, magnetic, physical and chemical properties of inorganic compounds chemical reactivity, physical properties and applications of inorganic compounds and materials mechanisms of inorganic reactions organometallic compounds inorganic cluster chemistry heterogenous and homogeneous catalytic reactions promoted by inorganic compounds thermodynamics and kinetics of significant new and known inorganic compounds supramolecular systems and coordination polymers bio-inorganic chemistry and applications of inorganic compounds in biological systems and medicine environmental and sustainable energy applications of inorganic compounds and materials MD