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

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

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

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

更新时间：2025-12-10

- Photocatalytic oxidation of Hg⁰ in flue gas using TiO₂-V₂O₅ nanofibers
- CIESC Journal Issue S2, Pages: 69-75(2012)
- 作者机构：
  
  华中科技大学煤燃烧国家重点实验室,湖北,武汉,430074
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.z2.013
  CLC： 51
- Online First：28 December 2012，
  
  Published：28 December 2012
- 稿件说明：
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YUAN Yuan, ZHANG Junying, LI Xiaolong, et al. Photocatalytic oxidation of Hg⁰ in flue gas using TiO₂-V₂O₅ nanofibers[J]. CIESC Journal, 2012, (S2): 69-75. DOI: 10.3969/j.issn.0438-1157.2012.z2.013.
DOI：

YUAN Yuan, ZHANG Junying, LI Xiaolong, et al. Photocatalytic oxidation of Hg⁰ in flue gas using TiO₂-V₂O₅ nanofibers[J]. CIESC Journal, 2012, (S2): 69-75. DOI: 10.3969/j.issn.0438-1157.2012.z2.013. DOI：

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。

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.

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