|
OALib Journal期刊
ISSN: 2333-9721
费用：99美元
|
|
|
|
X射线光电子能谱法研究UV254nm光催化、O3强化UV254nm光催化和真空紫外光催化降解甲醛中Pt-TiO2薄膜的表面性质
DOI: 10.1016/S1872-2067(12)60740-2, PP. 210-218
Keywords: 纳米铂,真空紫外光,光催化,臭氧分解,催化剂失活
Abstract:
？以Pt-TiO2为光催化剂，研究了气相甲醛分别在35h连续UV254nm光催化、O3强化UV254nm（O3+UV254nm）光催化和真空紫外（UV254+185nm）光催化中的降解效率，考察了副产物O3的去除率，采用X射线光电子能谱（XPS）法分析Pt-TiO2在不同光催化前后Pt的电子态和累积有机产物，研究纳米Pt对甲醛降解和O3去除的强化机理.连续光催化降解实验表明，以纳米Pt改性TiO2可以同时增强甲醛和O3的去除率，特别是O3的去除率可提高3.1-3.4倍.对催化剂C1s和O1s峰分别经分峰拟合处理后，发现Pt-TiO2上累积的含羰基和羟基的有机物含量按以下顺序减少：UV254nm光催化>O3强化UV254nm光催化>真空紫外光催化，而在连续35h光催化降解过程中，催化剂的失活现象却按相反的方向变得越来越不明显.负载的金属Pt在O3+UV254nm和UV254+185nm光催化过程中被氧化成PtOads和Pt4+物种，而在UV254nm光催化过程中金属Pt未被氧化，所以推测是气相中的O3和羟基自由基参与金属Pt的氧化过程.Pt-TiO2表面高价态的Pt氧化物种可作为光生电子捕获中心，强化光生载流子的分离过程，增强Pt-TiO2的光催化活性.Pt氧化物种可作为O3分解的活化中心，使Pt-TiO2对O3的分解效率远高于纯TiO2.以XPS对比研究在三种不同光催化环境中Pt-TiO2表面性质，可以解释在UV254+185nm光催化过程中纳米Pt对甲醛和O3同时去除的强化机理，并说明了催化剂不失活的内在原因.
| [1] | Hodgson A T, Destaillats H, Sullivan D P, Fisk W J. Indoor Air, 2007, 17: 305
|
| [2] | Pi Z, Cai L, Zhong J B, Gong M C, Chen Y Q. Chin J Catal (皮展, 蔡黎, 钟俊波, 龚茂初, 陈耀强. 催化学报), 2008, 29: 453
|
| [3] | Li J H, He H, Hu C, Zhao J C. Front Environ Sci Eng, 2013, 7: 302
|
| [4] | Jo W K, Kang H J. Chin J Catal (催化学报), 2012, 33: 1672
|
| [5] | Nie L H, Yu J G, Li X Y, Cheng B, Liu G, Jaroniec M. Environ Sci Technol, 2013, 47: 2777
|
| [6] | Yu J G, Li X Y, Xu Z H, Xiao W. Environ Sci Technol, 2013, 47: 9928
|
| [7] | Kataoka S, Tompkins D T, Zeltner W A, Anderson M A. J Photochem Photobiol A, 2002, 148: 323
|
| [8] | Zhang P Y, Liang F Y, Yu G, Chen Q, Zhu W P. J Photochem Photobiol A, 2003, 156: 189
|
| [9] | Zhang P Y, Liu J. J Photochem Photobiol A, 2004, 167: 87
|
| [10] | Kibanova D, Sleiman M, Cervini-Silva J, Destaillats H. J Hazard Mater, 2002, 211-212: 233
|
| [11] | Wang J H, Ray M B. Sep Purif Technol, 2000, 19: 11
|
| [12] | Fu P F, Zhang P Y, Li J. Appl Catal B, 2011, 105: 220
|
| [13] | Quici N, Vera M L, Choi H, Puma G L, Dionysiou D D, Litter M I, Destaillats H. Appl Catal B, 2010, 95: 312
|
| [14] | Zhang L, Zhang P Y, Chen S Z. Chin J Catal (张丽, 张彭义, 陈崧哲. 催化学报), 2007, 28: 299
|
| [15] | Fu P F, Luan Y, Dai X G. J Mol Catal A, 2004, 221: 81
|
| [16] | Kundu S, Wang Y M, Xia W, Muhler M. J Phys Chem C, 2008, 112: 16869
|
| [17] | Liu H M, Lian Z W, Ye X J, Shangguan W F. Chemosphere, 2005, 60: 630
|
| [18] | Yu K P, Lee G W M. Appl Catal B, 2007, 75: 29
|
| [19] | Bera P, Priolkar K R, Gayen A, Sarode P R, Hegde M S, Emura S, Kumashiro R, Jayaram V, Subbanna G N. Chem Mater, 2003, 15: 2049
|
| [20] | Falconer J L, Magrini-Bair K A. J Catal, 1998, 179: 171
|
| [21] | Lin J J, Kawai A, Nakajima T. Appl Catal B, 2002, 39: 157
|
| [22] | Naydenov A, Stoyanova R, Mehandjiev D. J Mol Catal A, 1995, 98: 9
|
| [23] | Ohtani B, Kakimoto M, Nishimoto S, Kagiya T. J Photochem Photobiol A, 1993, 70: 265
|
| [24] | Cho K C, Hwang K C, Sano T, Takeuchi K, Matsuzawa S. J Photochem Photobiol A, 2004, 161: 155
|
| [25] | Yu J G, Wang S H, Low J X, Xiao W. Phys Chem Chem Phys, 2013, 15: 16883
|
| [26] | Blount M C, Falconer J L. Appl Catal B, 2002, 39: 39
|
| [27] | Einaga H, Futamura S, Ibusuki T. Appl Catal B, 2002, 38: 215
|
| [28] | Obee T N, Hay S O. Environ Sci Technol, 1997, 31: 2034
|
| [29] | Ao C H, Lee S C, Mak C L, Chan L Y. Appl Catal B, 2003, 42: 119
|
| [30] | Takeuchi M, Hidaka M, Anpo M. J Hazard Mater, 2012, 237-238: 133
|
| [31] | Zhang P Y, Liu J, Zhang Z L. Chem Lett, 2004, 33: 1242
|
| [32] | Jeong J, Sekiguchi K, Lee W, Sakamoto K. J Photochem Photobiol A, 2005, 169: 279
|
| [33] | Jeong J, Sekiguchi K, Sakamoto K. Chemosphere, 2004, 57: 663
|
| [34] | Fu P F, Zhang P Y. Appl Catal B, 2010, 96: 176
|
| [35] | Hoffmann M R, Martin S T, Choi W, Bahnemann D W. Chem Rev, 1995, 95: 69
|
| [36] | Okpalugo T I T, Papakonstantinou P, Murphy H, McLaughlin J, Brown N M D. Carbon, 2005, 43: 153
|
| [37] | Shiraishi F, Ohkubo D, Toyoda K, Yamaguchi S. Chem Eng J, 2005, 114: 153
|
| [38] | Kibonova D, Cervini-Silva J, Destaillats H. Environ Sci Technol, 2009, 43: 1500
|
| [39] | Ohtani B, Iwai K, Nishimoto S-i, Sato S. J Phys Chem B, 1997, 101: 3349
|
| [40] | Dong F, Wang H Q, Sen G, Wu Z B, Lee S C. J Hazard Mater, 2011, 187: 509
|
| [41] | Wu Z B, Sheng Z Y, Liu Y, Wang H Q, Mo J S. J Hazard Mater, 2011, 185: 1053
|
| [42] | Hernández-Alonso M D, Coronado J M, Maira A J, Soria J, Loddo V, Augugliaro V. Appl Catal B, 2002, 39: 257
|
| [43] | Jiang C J, Zhang P Y, Zhang B, Li J G, Wang M X. Ozone Sci Eng, 2013, 35(4): 308
|
Full-Text
|
|
Contact Us
service@oalib.com QQ:3279437679 
WhatsApp +8615387084133
|
|
