酸根离子种类对TiO_2形貌和性能的影响
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摘要
采用简单易控的低温一步法,以草酸钛钾为钛源,选取不同酸根离子作为酸性介质制备TiO_2超细粉体;利用XRD和SEM对该粉体的晶型结构和形貌进行表征,并测试了样品在紫外光照射下对甲基橙溶液的光催化降解效率.结果表明:弱酸根离子中H~+的缓慢释放可降低反应体系中的粒子成核与长大速率;所制备的产物粒径均匀,且粒子尺寸小;在紫外光下照射0.5 h,甲基橙浓度可降低99.1%.
Based on one-step low-temperature method, TiO_2 ultrafine powders were prepared by using different acid ions as an acidic medium. The crystal structure and microstructure of the powders were characterized by XRD and SEM. The photocatalytic degradation efficiency of methyl orange solution was determined under UV illumination. The results showed that the weak acid radicals could help to reduce nucleation and crystallization rates of the particles in the reaction system. The as-prepared product had uniform and small particle size, which photocatalytic degradation rate reached 99.1% under 0.5 h irradiation with ultraviolet light.
Based on one-step low-temperature method, TiO_2 ultrafine powders were prepared by using different acid ions as an acidic medium. The crystal structure and microstructure of the powders were characterized by XRD and SEM. The photocatalytic degradation efficiency of methyl orange solution was determined under UV illumination. The results showed that the weak acid radicals could help to reduce nucleation and crystallization rates of the particles in the reaction system. The as-prepared product had uniform and small particle size, which photocatalytic degradation rate reached 99.1% under 0.5 h irradiation with ultraviolet light.
引文
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[3]刘松翠,吕康乐,邓克俭,等.三种不同晶型二氧化钛的制备及光催化性能研究[J].影像科学与光化学,2008,26(2):138-147.
[4]HOW G T,PANDIKUMAR A,MING H N,et al.Highly exposed{001}facets of titanium dioxide modified with reduced graphene oxide for dopamine sensing[J].Sci Rep,2014,4:1-8.
[5]CARNEIRO J O,TEIXEIRA V,AZEVEDO S,et al.Development of photocatalytic ceramic materials through the deposition of Ti O2nanoparticles layers[J].Journal of Nano Research,2012,18/19(9):165-176.
[6]MESGARI Z,GHARAGOZLOU M,KHOSRAVI A,et al.Synthesis characterization and evaluation of efficiency of new hybrid Pc/Fe-Ti O2nanocomposite as photocatalyst for decolorization of methyl orange using visible light irradiation[J].Appl Catal A Gen,2012,411(7):139-145.
[7]KOENENKAMP R,HENNINGER R,HOYER P.Photocarrier transport in colloidal titanium dioxide films[J].J Phys Chem,1993,97(28):7 328-7 330.
[8]GAUTAM S K,DAS A,SINGH R G,et al.Carrier transport mechanism of highly-sensitive niobium doped titanium dioxide/p-Si heterojunction photodiode under illuminations by solar simulated light[J].J Appl Phys,2016,120(21):1-7.
[9]FRESNO F,PORTELA R,SU魣REZ S,et al.Photocatalytic materials:recent achievements and near future trends[J].J Mater Chem A,2014,2(9):2 863-2 884.
[10]LI X,XIONG Y,LI Z,et al.Large-scale fabrication of Ti O2hierarchical hollow spheres[J].Lnorg Chem,2006,45(9):3 493-3 495.
[11]CHENG Q,PAVLINEK V,HE Y,et al.Synthesis and electrorheological characteristics of sea urchin-like Ti O2hollow spheres[J].Colloid Polym Sci,2011,289(7):799-805.
[12]YU Y Y,LEI B X,XIE M L,et al.A hierarchical homogeneous core-shell structure of Ti O2hollow microspheres for high efficiency dye-sensitized solar cells[J].Adv Powder Techno,2015,26(4):1 072-1 078.
[13]赖璐璐,吴进明.一种空心球状金红石二氧化钛介晶及其制备方法:CN 201510210633.X[P].2015-08-19.
[14]PATTERSON A L.The scherrer formula for X-ray particle size determination[J].Phys Rev,1939,56(10):978-982.
[15]刘中兴,谢传欣,石宁,等.过氧化氢溶液分解特性研究[J].齐鲁石油化工,2009,37(2):99-102.
[16]JIANG Z,XIE J,JIANG D,et al.Modifiers-assisted formation of nickel nanoparticles and their catalytic application to pnitrophenol reduction[J].Crystengcomm,2013,15(3):560-569.
[17]OHTANI B,PRIETO-MAHANEY O O,LI D,et al.What is Degussa(Evonik)P25?crystalline composition analysis,reconstruction from isolated pure particles and photocatalytic activity test[J].Journal of Photochemistry&Photobiology A Chemistry,2010,216(2/3):179-182.
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