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Preparation and photocatalytic activity of Nd-modified TiO2 photocatalysts: Insight into the excitation mechanism under visible light
Journal of Catalysis ( IF 7.3 ) Pub Date : 2017-08-07 , DOI: 10.1016/j.jcat.2017.07.017
Patrycja Parnicka , Paweł Mazierski , Tomasz Grzyb , Zhishun Wei , Ewa Kowalska , Bunsho Ohtani , Wojciech Lisowski , Tomasz Klimczuk , Joanna Nadolna

Titanium dioxide (TiO2) nanoparticles (NPs) modified with neodymium (Nd) in the range between 0.1 and 1.0 mol% were prepared via the hydrothermal method. The samples obtained were characterized by diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), X-ray fluorescence (EDX), Brunauer–Emmett–Teller (BET) method, X-ray powder diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL). The photocatalytic activity of the obtained samples was evaluated by photodegradation of phenol in aqueous solution under ultraviolet–visible (UV–Vis, λ > 350 nm) and visible (Vis, λ > 420 nm) irradiation. Experimental results showed that the photocatalysts exhibited high photocatalytic activity under Vis light. The sample showing the highest photoactivity under Vis irradiation was in the form of anatase; its surface area equalled 124 m2/g (1.16 times larger than that of pristine TiO2). The average crystal size was 10.9 nm, and it was modified with 0.1 mol% of Nd3+ (28% of phenol was degraded after 60 min of irradiation). The photocatalytic tests of phenol degradation in the presence of scavengers confirm that e and

were responsible for the visible light degradation of organic compounds in the aqueous phase. Action spectra analysis revealed that although Nd-modified TiO2 could be excited under visible light in the range of 400–480 nm, the up-conversion process is not responsible for the degradation of phenol under Vis irradiation.



中文翻译:

Nd修饰的TiO 2光催化剂的制备及其光催化活性:可见光下的激发机理的认识

二氧化钛(TiO 2通过水热法制备了0.1-1.0mol%的钕(Nd)改性的纳米颗粒(NPs)。获得的样品通过漫反射光谱(DRS),扫描电子显微镜(SEM),X射线荧光(EDX),Brunauer-Emmett-Teller(BET)方法,X射线粉末衍射分析(XRD),X-射线进行表征射线光电子能谱(XPS)和光致发光光谱(PL)。通过紫外-可见光(UV-Vis,λ> 350 nm)和可见光(Vis,λ> 420 nm)照射下水溶液中苯酚的光降解来评估所获得样品的光催化活性。实验结果表明,该光催化剂在可见光下具有较高的光催化活性。在Vis照射下显示出最高光活性的样品为锐钛矿形式。2 / g(是原始TiO 2的1.16倍)。平均晶体尺寸为10.9nm,并用0.1mol%的Nd 3+改性(辐照60分钟后28%的苯酚降解)。在清除剂的存在下苯酚降解的光催化测试证实,电子-

是造成水相中有机化合物可见光降解的原因。动作光谱分析表明,尽管Nd修饰的TiO 2可以在400-480 nm的可见光范围内被激发,但是上转换过程并不导致Vis辐射下苯酚的降解。

更新日期:2017-08-07
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