Visible active nanocrystalline N-doped anatase TiO2 particles for photocatalytic mineralization studies
Visible active nanocrystalline N-doped anatase TiO2 particles for photocatalytic mineralization studies
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DOI：
10.1016/j.matchemphys.2016.01.035
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发表时间：
2016-04-15
影响因子：
4.6
通讯作者：
Delekar, S. D.
中科院分区：
文献类型：
--
作者：
Barkul, R. P.;Koli, V. B.;Delekar, S. D.
采用溶胶-凝胶法制备了锐钛矿相氮掺杂TiO2纳米粒子（N-TiO2 NPs），其前驱体为特丁二氧化钛、冰醋酸、十二烷基硫酸钠、氨和尿素。x射线衍射（XRD）分析表明，所有样品均为纳米晶，具有锐钛矿相。透射电镜（TEM）测定了样品的粒径在5 ~ 12 nm之间。紫外可见吸收测试表明，掺杂样品的光学带隙随着掺杂浓度从0.0 mol%增加到7.0 mol%而减小。利用场发射扫描电镜（FESEM）和能量色散原子x射线（EDAX）光谱分析了这些N-TiO2 NPs的形貌和化学成分。研究了裸/掺杂TiO2样品光催化降解罗丹明B （Rhodamine B, RhB）染料火绒的活性。通过紫外可见光谱法测定光催化降解动力学参数和反应过程中的化学需氧量（COD）来监测光催化降解过程。研究了染料浓度和溶液pH对胶体裸/掺杂TiO2光催化降解反应的影响。在太阳光照下，氮浓度为7.0 mol%的N-TiO2催化剂在酸性或碱性介质下的光催化矿化活性最高。(C) 2016 Elsevier B.V.版权所有
Nitrogen-doped TiO2 nanoparticles (N-TiO2 NPs) with anatase phase were synthesized by sol gel method using a single precursor containing titanium (IV) terbutoxide, glacial acetic acid, sodium dodecyl sulphate, ammonia, and urea. X-ray diffraction (XRD) reveals the nanocrystalline nature with anatase phase of all the samples. The particle size of all samples was found in the range of 5-12 nm using transmission electron microscopy (TEM). UV-visible absorption measurements examined that the optical band gap of the doped samples decrease with increase in dopant concentration from 0.0 to 7.0 mol%. Field-emission scanning electron microscopy (FESEM) with energy dispersive atomic X-ray (EDAX) spectroscopy was employed to analyse the morphology and chemical composition of these N-TiO2 NPs. The photocatalytic activity of bare/doped TiO2 samples was demonstrated for the degradation of Rhodamine B (RhB) dye tinder direct sunlight irradiation. The photocatalytic degradation was monitored by measuring the kinetic parameters based on UV-visible spectroscopy as well as the chemical oxygen demand (COD) during the course of the reaction. The effect of dye concentration and pH of the solution on the photocatalytic degradation reaction in the presence of colloidal bare/doped TiO2 were also studied. The N-TiO2 catalyst, with a nitrogen concentration of 7.0 mol%, showed the highest activity for photocatalytic mineralization of dye at acidic or alkaline medium than neutral condition under solar light irradiation directly. (C) 2016 Elsevier B.V. All rights reserved.