Visible-light-induced degradation of formaldehyde over titania photocatalyst co-doped with nitrogen and nickel
Visible-light-induced degradation of formaldehyde over titania photocatalyst co-doped with nitrogen and nickel
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DOI：
10.1016/j.apsusc.2008.01.094
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发表时间：
2008-05
影响因子：
6.7
通讯作者：
Xin Zhang;Qingquan Liu
中科院分区：
文献类型：
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作者：
Xin Zhang;Qingquan Liu
以异丙醇钛、碳酸铵和硝酸镍为钛、氮、镍的来源，采用改进的溶胶-凝胶法制备了氮、镍共掺杂的二氧化钛光催化剂。采用x射线衍射（XRD）、紫外-可见漫反射光谱（DRS）、x射线光电子能谱（XPS）、扫描电子显微镜（SEM）对催化剂进行了表征。制备的N-Ni共掺杂光催化剂在可见光区表现出良好的光吸收，在可见光照射下对甲醛的降解表现出优异的光催化能力。研究了退火温度和组分对相组成和光催化活性的影响。结果表明，氮原子被编织到二氧化钛的结构中，导致二氧化钛对可见光的响应。而镍原子以Ni2O3的形式存在，分散在TiO2表面，抑制了光致电子-空穴对的复合，提高了光量子效率，增强了光催化性能。光活性的提高是由于共掺杂的协同作用。
Titanium isopropoxide, ammonium carbonate and nickelous nitrate were used as the sources of titanium, nitrogen, and nickel to prepare titania photocatalyst co-doped with nitrogen and nickel by means of the modified sol–gel method. The photocatalyst was characterized by X-ray diffraction (XRD), UV–vis diffusive reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM). The prepared N-Ni co-doped photocatalyst showed optical absorption in the visible light area and exhibited excellent photocatalytic ability for the degradation of formaldehyde under visible light irradiation. The effects of annealing temperature and component on the phase composition and photocatalytic activity were investigated. The results demonstrated that nitrogen atoms was weaved into the structure of titania and led to the response to visible light. However, nickel atoms existed in the form of Ni2O3, dispersed on the surface of TiO2, suppressed the recombination of photo-induced electron-hole pairs, raised the photo quantum efficiency, and led to the enhancement of photocatalytic performance. The increase of photoactivity was attributed to the synergistic effects of co-doping.