Mahlambi Mphilisi M, Mishra Ajay K, Mishra Shivani B, Krause Rui W, Mamba Bhekie B, Raichur Ashok M
Department of Applied Chemistry, University of Johannesburg, PO Box 17011, Doornfontein 2028, South Africa.
J Nanosci Nanotechnol. 2013 Jul;13(7):4934-42. doi: 10.1166/jnn.2013.7587.
Metal-doped anatase nanosized titania photocatalysts were successfully synthesized using a sol-gel process. Different amounts of the dopants (0.2, 0.4, 0.6, 0.8 and 1.0%) of the metals (Ag, Ni, Co and Pd) were utilized. The UV-Vis spectra (solid state diffuse reflectance spectra) of the doped nanoparticles exhibited a red shift in the absorption edge as a result of metal doping. The metal-doped nanoparticles were investigated for their photocatalytic activity under visible-light irradiation using Rhodamine B (Rh B) as a control pollutant. The results obtained indicate that the metal-doped titania had the highest activity at 0.4% metal loading. The kinetic models revealed that the photodegradation of Rh B followed a pseudo first order reaction. From ion chromatography (IC) analysis the degradation by-products Rhodamine B fragments were found to be acetate, chloride, nitrite, carbonate and nitrate ions.
采用溶胶-凝胶法成功合成了金属掺杂的锐钛矿型纳米二氧化钛光催化剂。使用了不同含量（0.2%、0.4%、0.6%、0.8%和1.0%）的金属（银、镍、钴和钯）作为掺杂剂。由于金属掺杂，掺杂纳米颗粒的紫外-可见光谱（固态漫反射光谱）在吸收边缘出现红移。以罗丹明B（Rh B）作为对照污染物，研究了金属掺杂纳米颗粒在可见光照射下的光催化活性。所得结果表明，金属掺杂量为0.4%时，金属掺杂二氧化钛具有最高活性。动力学模型表明，Rh B的光降解遵循准一级反应。通过离子色谱（IC）分析发现，降解副产物罗丹明B碎片为乙酸根、氯离子、亚硝酸根、碳酸根和硝酸根离子。
