Junlabhut Prasopporn, Wattanawikkam Chakkaphan, Mekprasart Wanichaya, Pecharapa Wisanu
J Nanosci Nanotechnol. 2018 Oct 1;18(10):7302-7309. doi: 10.1166/jnn.2018.15717.
Metal-doped TiO2 nanoparticles (Metal = Mn, Co, Zn, Ni) were synthesized by sonochemical method accompanying post calcination process using metallic nitrates of manganese, cobalt, zinc, nickel with various metal contents from 0-5 mol% and titanium isopropoxide as a starting precursors. Sodium hydroxide (NaOH) base was used as a precipitating agent. The influence of ultrasound operated at 750 W 20 kHz on the crystalline structure of metal-doped TiO2 nanoparticles has been characterized by X-ray diffraction (XRD) while morphologies and grain size of the nanoparticles were monitored by field emission scanning electron microscope (FE-SEM). The optical absorptivities and corresponding band gaps were evaluated by diffuse reflectance spectroscopy (DRS). The performance of photocatalytic activities of metal-doped TiO2 nanoparticles against aqueous organic dye Rhodamine B (RhB) under visible light was investigated. The results reveal that their crystallinity of synthesized metal doped TiO2 nanoparticles is in mixed phase between anatase, rutile and brookite with calcination temperature at 500 °C for 3 h and their crystalline of all samples are shown. The incorporation of metal dopant on the photocatalytic performance of TiO2 exhibits a significant enhancement in its photocatalytic activities under visible light due to the decrease in band gap energy of metal doped TiO2 nanoparticles.
采用声化学法，以锰、钴、锌、镍的金属硝酸盐（金属含量为0 - 5 mol%）和异丙醇钛为起始前驱体，通过后续煅烧过程合成了金属掺杂的二氧化钛纳米颗粒（金属 = 锰、钴、锌、镍）。使用氢氧化钠（NaOH）碱作为沉淀剂。利用X射线衍射（XRD）表征了750 W、20 kHz超声对金属掺杂二氧化钛纳米颗粒晶体结构的影响，同时用场发射扫描电子显微镜（FE - SEM）监测纳米颗粒的形貌和粒径。通过漫反射光谱（DRS）评估光吸收系数和相应的带隙。研究了金属掺杂二氧化钛纳米颗粒在可见光下对水性有机染料罗丹明B（RhB）的光催化活性。结果表明，合成的金属掺杂二氧化钛纳米颗粒在500℃煅烧3 h时，其结晶度处于锐钛矿、金红石和板钛矿的混合相，且展示了所有样品的晶体结构。由于金属掺杂二氧化钛纳米颗粒的带隙能量降低，金属掺杂剂对二氧化钛光催化性能的影响在可见光下显著提高了其光催化活性。
