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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (11): 1037-1042.    下一篇

研究论文

Keggin型铁取代杂多阴离子PW11O39Fe(III)(H2O)4－光催化降解硝基苯

王崇太1,2，孙振范1，华英杰*,1，华淑艳1，张大帅1，童叶翔3   

  1. 1海南师范大学化学与化工学院 海口 571158)
    (2海南省热带药用植物化学重点实验室 海口 571158)
    (3中山大学化学与化工学院 广州 510275
  • 投稿日期:2009-09-18 修回日期:2009-12-28 发布日期:2010-01-26
  • 通讯作者: 王崇太 E-mail:wct581@sina.com
  • 基金资助:

    国家自然科学资金项目（No.20963003）;海南省重点科技项目（No.080305; No.090803）;海南省自然科学基金项目（No.509010;No.509009），海南师范大学省重点学科有机化学开放资金资助项目

Photocatalytic Degradation of Nitrobenzene with Keggin-type Fe(III)-Substituted Heteropolyanion PW11O39Fe(III)(H2O)4－

Wang Chongtai1,2 Sun Zhenfan1 Hua Yingjie*,1 Hua Shuyan1 Zhang Dashuai1 Tong Yexiang3   

  1. 1School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158)
    (2Key Lab of Tropical Medicinal Plant Chemistry of Hainan Province, Haikou 571158)
    (3School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275
  • Received:2009-09-18 Revised:2009-12-28 Published:2010-01-26
  • Contact: chongtai wang E-mail:wct581@sina.com

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以Keggin型铁取代杂多阴离子PW11O39Fe(III)(H2O)4－[PW11Fe(III)(H2O)]代替传统光芬顿方法中的Fe3＋作为光催化剂, 构成一个新颖的光催化体系并用于水体生物难降解有机污染物硝基苯(NB)的降解. 详细研究了在紫外光照射和H2O2存在下, PW11Fe(III)(H2O)对NB降解的均相光催化作用. 考察了NB初始浓度、溶液pH、H2O2和PW11Fe(III)(H2O)浓度对光催化降解反应速率的影响. 实验结果表明, 1.0 mmol•L－1 PW11Fe(III)(H2O)＋5.0 mmol•L－1 H2O2＋1.0 mmol•L－1NB的中性溶液在300 W汞灯照射下反应120 min, NB的降解率达93%, 总有机碳(TOC)去除约31%, 显示了该新颖体系对NB光催化降解的高效性和优越性.

关键词: 铁取代杂多阴离子, 均相光催化, 硝基苯降解, TOC

A novel system using the Keggin-type PW11O39Fe(III)(H2O)4－ [PW11Fe(III)(H2O)] to substitute Fe3＋ in conventional photo-Fenton as a photo-catalyst was developed. This novel system was applied to degrade the aqueous biorefractory organic pollutant nitrobenzene (NB). The homogeneous photocatalytic degradation of NB by PW11Fe(III)(H2O) was studied in detail under an artificial UV irradiation and the existence of hydrogen peroxide (H2O2), in which the effects of initial NB concentration, pH, H2O2 and PW11Fe(III)(H2O) concentration on the photocatalytic degradation rate of NB were examined. The experimental results show that ca. 93% NB degradation ratio was obtained in less than 120 min in a pH 6.86 mixed phosphate solution containing 1.0 mmol•L－1 NB＋1.0 mmol•L－1 PW11Fe(III)(H2O)＋5.0 mmol•L－1 H2O2 under irradiation with a 300 W Hg lamp, and a total organic carbon (TOC) removal of ca. 31% was achieved, indicating an excellent efficiency and advantage in photo-catalytic degradation of NB by this novel system.

Key words: iron-substituted heteropolyanion, homogeneous photocatalysis, nitrobenzene degradation, TOC