宽光谱吸收TaON/BiO_(1.2)I_(0.6)制备及甲苯降解研究
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摘要
高效光催化分解挥发性有机化合物的关键在于提高催化剂光生载流子的分离效率。采用TaON修饰BiO_(1.2)I_(0.6),获得了一种新型宽光谱吸收富氧缺碘材料5%TaON/BiO_(1.2)I_(0.6)。研究发现,5%TaON/BiO_(1.2)I_(0.6)显示出优异的光催化分解典型VOCs甲苯的活性。经过300 W氙灯24 h照射,0.2 g 5%TaON/BiO_(1.2)I_(0.6)可以将约74%的甲苯降解,其降解效率为BiO_(1.2)I_(0.6)的1.4倍。5%TaON/BiO_(1.2)I_(0.6)中光生载流子的分离效率显著高于BiO_(1.2)I_(0.6),这极大地增强了它的光催化活性。
The key to efficient photocatalytic decomposition of volatile organic compounds is to improve carrier separation-efficiency of the photocatalyst.In this work, TaON was used to modify BiO_(1.2)I_(0.6), thereby obtaining 5%TaON/BiO_(1.2)I_(0.6) composites with wide spectrum absorption and oxygen enrichment and iodine deficiency. The 5%TaON/BiO_(1.2)I_(0.6 )exhibited the optimal photocatalytic activity. About 74% of toluene was degraded over 0.2 g of 5%TaON/BiO_(1.2)I_(0.6 )after 24 h of irradiation using a 300 W xenon lamp, which was 1.4 times that over BiO_(1.2)I_(0.6). Compared to BiO_(1.2)I_(0.6),the distinctly enhanced photocatalytic activity of 5%TaON/BiO_(1.2)I_(0.6 )was basically attributed to efficient separation of photo-generated carriers.
The key to efficient photocatalytic decomposition of volatile organic compounds is to improve carrier separation-efficiency of the photocatalyst.In this work, TaON was used to modify BiO_(1.2)I_(0.6), thereby obtaining 5%TaON/BiO_(1.2)I_(0.6) composites with wide spectrum absorption and oxygen enrichment and iodine deficiency. The 5%TaON/BiO_(1.2)I_(0.6 )exhibited the optimal photocatalytic activity. About 74% of toluene was degraded over 0.2 g of 5%TaON/BiO_(1.2)I_(0.6 )after 24 h of irradiation using a 300 W xenon lamp, which was 1.4 times that over BiO_(1.2)I_(0.6). Compared to BiO_(1.2)I_(0.6),the distinctly enhanced photocatalytic activity of 5%TaON/BiO_(1.2)I_(0.6 )was basically attributed to efficient separation of photo-generated carriers.
引文
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[3]SEXTON K,ADGATE J L,RAMACHANDRAN G,et al.Comparison of personal,indoor,and outdoor exposures to hazardous air pollutants in three urban communities[J].Environmental Science & Technology,2004,38(2):423-430.
[4]XIE H,LIU B S,ZHAO X J.Facile process to greatly improve the photocatalytic activity of the TiO2 thin film on window glass for the photodegradation of acetone and benzene[J].Chemical Engineering Journal,2016,284:1156-1164.
[5]JANSSON I,SUáREZ S,GARCIA-GARCIA F J,et al.Zeolite-TiO2 hybrid composites for pollutant degradation in gas phase[J].Applied Catalysis B:Environmental,2015,178:100-107.
[6]BIANCHI C L,GATTO S,PIROLA C,et al.Photocatalytic degradation of acetone,acetaldehyde and toluene in gas-phase:comparison between nano and micro-sized TiO2[J].Applied Catalysis B:Environmental,2014,146:123-130.
[7]XIAO X,ZHANG W D.Facile synthesis of nanostructured BiOI microspheres with high visible light-induced photocatalytic activity[J].Journal of Materials Chemistry,2010,20(28):5866-5870.
[8]WANG Y N,DENG K J,ZHANG L Z.Visible light photocatalysis of BiOI and its photocatalytic activity enhancement by in situ ionic liquid modification[J].The Journal of Physical Chemistry C,2011,115(29):14300-14308.
[9]LI Y Y,WANG J S,YAO H C,et al.Efficient decomposition of organic compounds and reaction mechanism with BiOI photocatalyst under visible light irradiation[J].Journal of Molecular Catalysis A:Chemical,2011,334(1/2):116-122.
[10]XIAO X,HAO R,ZUO X X,et al.Microwave-assisted synthesis of hierarchical Bi7O9I3 microsheets for efficient photocatalytic degradation of bisphenol-A under visible light irradiation[J].Chemical Engineering Journal,2012,209:293-300.
[11]XIAO X,XING C L,HE G P,et al.Solvothermal synthesis of novel hierarchical Bi4O5I2 nanoflakes with highly visible light photocatalytic performance for the degradation of 4-tert-butylphenol[J].Applied Catalysis B:Environmental,2014,148/149:154-163.
[12]SUN S M,WANG W Z,ZHANG L,et al.Visible light-induced efficient contaminant removal by Bi5O7I[J].Environmental Science & Technology,2009,43(6):2005-2010.
[13]GUAN Y,WANG S M,WANG X,et al.Solvothermal method coupled with thermal decomposition for synthesis of non-stoichiometric BiO1.18I0.64 with excellent photocatalytic activity[J].RSC Advances,2016,6(4):2641-2650.
[14]YAN S C,LYU S B,LI Z S,et al.Organic-inorganic composite photocatalyst of g-C3N4 and TaON with improved visible light photocatalytic activities[J].Dalton Transactions(Cambridge,England:2003),2010,39(6):1488-1491.
[15]HOU J G,WANG Z,KAN W B,et al.Efficient visible-light-driven photocatalytic hydrogen production using CdS@TaON core-shell composites coupled with graphene oxide nanosheets[J].Journal of Materials Chemistry,2012,22(15):7291-7299.
[16]CHUN W J,ISHIKAWA A,FUJISAWA H,et al.Conduction and valence band positions of Ta2O5,TaON,and Ta3N5 by UPS and electrochemical methods[J].The Journal of Physical Chemistry B,2003,107(8):1798-1803.