Photocatalytic oxidation of Hg0 in flue gas using TiO2-V2O5 nanofibers

doi:10.3969/j.issn.0438-1157.2012.z2.013

CIESC Journal ›› 2012, Vol. 63 ›› Issue (S2): 69-75.DOI: 10.3969/j.issn.0438-1157.2012.z2.013

Previous Articles Next Articles

Photocatalytic oxidation of Hg⁰ in flue gas using TiO₂-V₂O₅ nanofibers

YUAN Yuan, ZHANG Junying, LI Xiaolong, ZHAO Yongchun, ZHENG Chuguang

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China

Received:2012-03-30 Revised:2012-05-13 Online:2012-12-28 Published:2012-12-28
Supported by:
supported by the National Basic Research Program of China(2011CB201500)and the National Natural Science Foundation of China (41172140,51176060,51021065).

TiO₂-V₂O₅纳米纤维光催化氧化烟气中的Hg⁰

袁媛, 张军营, 李小龙, 赵永椿, 郑楚光

华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074

通讯作者: 张军营
作者简介:袁媛(1981-),女,博士研究生。
基金资助:
国家重点基础研究发展计划项目(2011CB201500);国家自然科学基金项目(41172140,51176060,51021065)。

Abstract

Abstract: Nanofibers of TiO₂ and TiO₂-V₂O₅ prepared by an electrospinning method were used to remove Hg⁰ in flue gas,and characterized by SEM,TEM,XRD,BET as well as UV-Vis.The TiO₂-V₂O₅ nanofiber is of anatase phase structure and V₂O₅ is highly dispersed in the fiber.Its average diameter is around 200 nm.The fiber is composed of a large number of nanoparticles with diameter around 10 nm. Compared with pure TiO₂,UV-Vis absorption intensity of TiO₂-V₂O₅ significantly increases and its absorption bandwidth also broadens.The mercury removal efficiencies under various illuminations,the optimum doping content of V₂O₅ as well as the capabilities to oxidize Hg⁰ for 8 cycles were also tested.In addition,mechanism analysis was used to reveal photocatalytic activity enhancement of TiO₂-V₂O₅ nanofibers.The result shows that 66% of Hg⁰ removal efficiency can be reached under visible irradiation at the sample with 3% V₂O₅ doping,and much higher than 7% for pure TiO₂.After eight cycles,Hg⁰ removal efficiencies over TiO₂-V₂O₅ still remain stable at 80% and 65% under UV and visible light respectively,indicating that this fiber catalyst could be used for long time.The increase of photocatalytic activity under visible light could be attributed to its electron transition and better photoelectron-hole separation.

Key words: electrospinning, TiO₂-V₂O₅, nanofiber, photocatalytic, mercury removal

摘要： 对静电纺丝法制备的TiO₂和TiO₂-V₂O₅纳米纤维进行光催化脱除模拟烟气中Hg⁰的研究。对纳米纤维进行了SEM、TEM、XRD、BET和UV-Vis检测。结果表明TiO₂-V₂O₅纳米纤维为锐钛矿,V₂O₅高度分散在TiO₂中。纤维直径在200 nm左右,由粒径为10 nm左右的微粒组成。掺杂V₂O₅后,纤维的吸光范围扩大,在可见光范围内的吸光度比纯TiO₂时有了很大提高。实验研究了不同光照条件、V₂O₅的掺杂量和循环次数对脱汞的影响,分析了TiO₂-V₂O₅催化脱汞的机理。当V₂O₅的质量含量为3%时,TiO₂-V₂O₅在可见光下的脱汞率可达到66%,比纯TiO₂时的7%有了显著提高;纤维的脱汞性能稳定,多次循环后紫外光和可见光下的脱汞率仍分别保持在80%和65%左右。电子的跃迁和电子、空穴的快速分离是TiO₂-V₂O₅在可见光下脱汞率提高的主要原因。

关键词: 静电纺丝, TiO₂-V₂O₅, 纳米纤维, 光催化, 脱汞

CLC Number:

YUAN Yuan, ZHANG Junying, LI Xiaolong, ZHAO Yongchun, ZHENG Chuguang. Photocatalytic oxidation of Hg⁰ in flue gas using TiO₂-V₂O₅ nanofibers[J]. CIESC Journal, 2012, 63(S2): 69-75.

袁媛, 张军营, 李小龙, 赵永椿, 郑楚光. TiO₂-V₂O₅纳米纤维光催化氧化烟气中的Hg⁰[J]. 化工学报, 2012, 63(S2): 69-75.

References 22

[1]	Lopez-Anton M A,Diaz-Somoano M,Martincz-Tarazona M R.Retention of elemental mercury in fly ashes in different atmospheres[J].Energy Fuels,2007,21:99
[2]	Zhao Y C,Zhang J Y,Liu J,Díaz-Somoano M,Abad-Valle P,Martínez M R,Zheng C G.Experimental study on fly ash capture mercury in flue gas[J].Sci. China Ser. E-Tech. Sci.,2002,45:40
[3]	Hassett D J,Eylands K E.Mercury capture on coal combustion fly ash[J].Fuel,1999,78:243
[4]	Pitoniak E,Wu C Y,Londeree D,Mazyck D,Bonzongo J,Powers K,Sigmund W.Nanostructured silica-gel doped with TiO2 for mercury vapor control[J].J. Nanopart. Res.,2003,5:281
[5]	Streets D G,Hao J,Wu Y.Anthropogenic mercury emissions in China[J].Atmos. Environ.,2005,39:7789
[6]	Milford J,Pienciak A.After the clean air mercury rule:prospects for reducing mercury emissions from coal-fired power plants[J].Environ. Sci. Technol.,2009,43:2669
[7]	Luo G Q,Yao H,Xu M H,Cui X W,Chen W X,Gupta R,Xu Z H.Carbon nanotube-silver composite for mercury capture and analysis[J].Energy Fuels,2010,24:419
[8]	Romero C E,Li Y,Bilirgen H,Sarunac N,Levy E. Modification of boiler operating conditions for mercury emissions reductions in coal-fired utility boilers[J].Fuel,2006,85:204
[9]	Galbreath K C,Zygarlicke C J.Mercury transformations in coal combustion flue gas[J].Fuel Process Technol.,2000,65:289
[10]	Senior C L,Helble J J,Sarofim A F.Emissions of mercury,trace elements,and fine particles from stationary combustion sources[J].Fuel Process Technol.,2000,65:263
[11]	Chen X,Mao S S.Titanium dioxide nanomaterials:synthesis,properties,modifications,and applications[J].Chem. Rev.,2007,107:2891
[12]	Chen S F,Zhang S J,Liu W,Zhao W.Preparation and activity evaluation of p-n junction photocatalyst NiO/TiO2[J].J. Hazard Mater.,2008,155:320
[13]	Chen Qifeng(陈其凤),Shi Weimei(史卫梅),Jiang Dong(姜东),Xu Yao(徐耀),Wu Dong(吴东),Sun Yuhan(孙予罕).Visible-light-activated Ni-Si co-doped TiO2 with photocatalytic performance[J].Chimica Sinica(化学学报),2010,68:301
[14]	Li H L,Wu C Y,Li Y,Zhang J Y.CeO2-TiO2 catalysts for catalytic oxidation of elemental mercury in low-rank coal combustion flue gas[J].Environ. Sci. Technol.,2011,45:7394
[15]	Wan Q,Duan L,He K B,Li J H.Removal of gaseous elemental mercury over a CeO2-WO3/TiO2 nanocomposite in simulated coal-fired flue gas[J].Chem. Eng. J.,2011,170:512
[16]	Jiang Hongquan(姜洪泉),Wang Peng(王鹏),Lu Dandan(卢丹丹),Wu Lanying(吴兰英).Crystallite size,surface properties and photocatalytic activity of Gd3+-doped TiO2 nano-powder[J].Journal of Chemical Industry and Engineering(China)(化工学报),2006,57:2194-2200
[17]	Li S J,Ma Z C,Wang L,Liu J Z.Influence of MnO2 on the photocatalytic activity of P-25 TiO2 in the degradation of methyl orange[J].Sci. China Ser. B-Chem.,2008,51:179
[18]	Yuan Yuan(袁媛),Zhao Yongchun(赵永椿),Zhang Junying(张军营),Wang Yuxiang(王宇翔),Chen Yumin(陈玉民),Zheng Chuguang(郑楚光).Study on photocatalytic experiments of desulfurization,denitrification and mercury removal using a TiO2-aluminum silicate fiber nanocomposite[J].Proceeding of the CSEE(中国电机工程学报),2011,31:79
[19]	Yan B,Lei L,You Y M,Xu X J,Zheng Z,Shen Z X,Ma J,Tong L M,Yu T.Single-crystalline V2O5 ultralong nanoribbon waveguides[J].Adv. Mater.,2009,21:1
[20]	Liu J H,Yang R,Li S M.Preparation and characterization of the TiO2-V2O5 photocatalyst with visible-light activity[J].Rare Metals,2006,25:636
[21]	Wang Y,Su Y R,Qiao L,Liu L X,Su Q,Zhu C Q,Liu X Q.Synthesis of one-dimensional TiO2/V2O5 branched heterostructures and their visible light photocatalytic activity towards Rhodamine B[J].Nanotechnology,2011,22:225702
[22]	Xu B L,Fan Y N,Liu L,Lin M,Chen Y.Dispersion state and catalytic properties of vanadia species on the surface of V2O5/TiO2 catalysts[J].Sci. China Ser. B-Chem.,2002,45:407

Photocatalytic oxidation of Hg⁰ in flue gas using TiO₂-V₂O₅ nanofibers

TiO₂-V₂O₅纳米纤维光催化氧化烟气中的Hg⁰

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References 22

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	Yanpeng WU, Xiaoyu LI, Qiaoyang ZHONG. Experimental analysis on filtration performance of electrospun nanofibers with amphiphobic membrane of oily fine particles [J]. CIESC Journal, 2023, 74(S1): 259-264.
[2]	Xingzhi HU, Haoyan ZHANG, Jingkun ZHUANG, Yuqing FAN, Kaiyin ZHANG, Jun XIANG. Preparation and microwave absorption properties of carbon nanofibers embedded with ultra-small CeO₂ nanoparticles [J]. CIESC Journal, 2023, 74(8): 3584-3596.
[3]	Feng WANG, Shunxin ZHANG, Fangbo YU, Ya LIU, Liejin GUO. Optimization strategy for producing carbon based fuels by photocatalytic CO₂ reduction [J]. CIESC Journal, 2023, 74(1): 29-44.
[4]	Chunjie XIE, Ran HE, Xinlin TUO, Wantai YANG. Preparation and performance of para-aramid aerogel powders [J]. CIESC Journal, 2021, 72(12): 6361-6370.
[5]	Ding DING, Wenduo LU, Lu HOU, Anhui LU. Preparation of fibrous BPO₄/SiO₂ catalyst for oxidative dehydrogenation of propane [J]. CIESC Journal, 2021, 72(11): 5590-5597.
[6]	ZHU Xiao, FENG Shasha, ZHONG Zhaoxiang, XING Weihong. Preparation and research progress of amphiphobic membrane for air purification [J]. CIESC Journal, 2021, 72(1): 71-85.
[7]	Yanpeng WU, Wei ZHAO, Fengjun CHEN. Experimental study on air filtration performance of nanofiber membrane with hydrophilic and hydrophobic function at different relative humidity [J]. CIESC Journal, 2020, 71(S1): 471-478.
[8]	Junyuan WU, Weizhi HUO, Zhiqiang LI, Jiaheng ZENG, Yanbin JIANG. Preparation of coaxial electrospun zein nanofiber film embedding sodium lignosulfonate for enhanced adsorption of heavy metal ions [J]. CIESC Journal, 2020, 71(S1): 252-260.
[9]	Lijun GAO, Silin BAI, Sucen LIANG, Ye MU, Qiang DONG, Chao HU. ZIF-derived porous carbon nanofibers for high-efficiency capacitive deionization [J]. CIESC Journal, 2020, 71(6): 2760-2767.
[10]	Jinman YANG, Xingwang ZHU, Guli ZHOU, Hui XU, Huaming LI. Preparation of MOFs-derived hollow Co₃O₄/CdIn₂S₄ heterojunction with enhanced photocatalytic carbon dioxide reduction activity [J]. CIESC Journal, 2020, 71(6): 2780-2787.
[11]	Ailian XUE, Shouyong ZHOU, Jianjian CAI, Meisheng LI, Yan ZHANG, Yijiang ZHAO. Preparation and properties of temperature-responsive PVDF/PGS-g-PNIPAM nanocomposite ultrafiltration membrane [J]. CIESC Journal, 2020, 71(3): 1380-1389.
[12]	LIU Shuai,LI Xuelei,LI Qimeng,WANG Yanjuan,ZHANG Jian,FENG Ruijiang,HU Shaozheng. Kapok fiber modified carbon nitride photocatalytic degradation of organic pollutants [J]. CIESC Journal, 2020, 71(12): 5530-5540.
[13]	Luming HE,Zhong XIN,Wenli GAO,Jia GU,Xin MENG. Highly efficient porous Ni/SiO₂ catalysts prepared by electrospinning method for CO methanation [J]. CIESC Journal, 2020, 71(11): 5007-5015.
[14]	LIU Xuejiao, YANG Lin, TANG Lan, ZHANG Liping. Preparation and characterization of polylactic acid-based cellulose nanofibers/graphene conductive composite membranes [J]. CIESC Journal, 2017, 68(12): 4833-4840.
[15]	TENG Xuegang, YANG Renchun, REN Chao, LIU Lulu, WANG Mingxing. Preparation of C/TiO₂-SO₄^2- and their water splitting performance [J]. CIESC Journal, 2017, 68(11): 4414-4422.