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应用生态学报 ›› 2005, Vol. 16 ›› Issue (4): 688-692.

• 研究论文 • 上一篇    下一篇

2,4-二氯苯酚的矿物表面化学行为研究

林琦, 吴坚阳, 陈英旭, 金海峰   

  1. 浙江大学环境与资源学院环境保护研究所, 杭州 310029
  • 收稿日期:2004-05-02 修回日期:2004-11-17 出版日期:2005-04-15 发布日期:2005-04-15
  • 通讯作者: 林琦,女,1970年生,博士,副教授.主要从事环境污染模拟与控制方面的研究,发表论文30余篇.E-mail:linqi@zju.edu.cn;Tel:0571-86971424
  • 基金资助:
    浙江省重大科技攻关资助项目(021102538).

Surface chemical behavior of 2,4-dichlorophenol in presence of metal oxides

LIN Qi, WU Jianyang, CHEN Yingxu, JIN Haifeng   

  1. Institute of Environmental Protection, Zhejiang University, Hangzhou 310029, China
  • Received:2004-05-02 Revised:2004-11-17 Online:2005-04-15 Published:2005-04-15

摘要: 矿物质是土壤中的重要组成成分,本实验采用动态反应和平衡反应研究氧化物矿物表面2,4-二氯苯酚(2,4-DCP)的化学行为.结果表明,无定形铁氧化物、针铁矿、α-MnO2、δ-MnO2对自然的或外源的有机化合物有较强的氧化能力,其中对2,4二氯苯酚的氧化能力是:δ-MnO2αMnO2>无定形铁氧化物、针铁矿.采用分段法估算反应系统的速率,发现氧化锰氧化2,4-二氯苯酚的反应速率是氧化铁的3~50倍,δ-MnO2氧化2,4-二氯苯酚的速率是α-MnO2的1.5~3.2倍.根系分泌物由于参与氧化物表面化学反应,对系统2,4-二氯苯酚的氧化过程产生一定影响,α-MnO2加入根系分泌物后,2,4-二氯苯酚在溶液中的消减速率明显减慢,δ-MnO2则相反,在根系分泌物共存下溶液中的2,4-二氯苯酚的转化率增加.Cu复合共存可能影响2,4二氯苯酚在矿物表面的键合氧化过程,其中δ-MnO2对铜吸附能力大于αMnO2,Cu复合共存对δMnO2表面2,4-二氯苯酚的氧化影响较大.

关键词: 氧化物矿物, 根系分泌物, 有机污染物, 表面化学

Abstract: To understand the surface chemistry of phenolic pollutants in the presence of metal oxides,this paper studied the reactions of 2,4-dichlorophenol with metal oxides in a kinetic and batch experiment.The results showed that amorphous ferric oxyhydroxide,goethite,δ-MnO2 and α-MnO2 were the potential oxidizing agents of natural and xenobiotic organic compounds.The oxidation rate of 2,4-DCP on the surface of these metal oxides was in order of δ-MnO2 α-MnO2 > iron oxides.It was observed from the pseudo-first-order kinetics that the reaction rates of manganese oxides were 3~50 times higher than those of iron oxides,and δ-MnO2 had a1. 5~3.2 times higher reaction rate than α-MnO2.Root exudates had a significant effect on the oxidation ability of metal oxides through changing the surface characteristics or involving in the reaction process.Upon the addition of ryegrass root exudates,the oxidation of 2,4-DCP was decreased in the suspension of α-MnO2 while increased in that of δ-MnO2.The coexistence of Cu probably influenced the oxidation process of 2,4-DCP on the surface of metal oxides.A greater negative effect of Cu on the oxidation of 2,4-DCP was also observed in the suspension of δ-MnO2 due to its strong adsorption toward Cu,as compared with that of α-MnO2.

Key words: Metal oxide, Root exudates, Organic pollutant, Surface chemistry

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