五氯苯酚在矿物表面吸附——实验、表面反应模式及其环境意义

吴大清 已出版文章查询
吴大清
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1 刁桂仪 已出版文章查询
刁桂仪
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1 袁鹏 已出版文章查询
袁鹏
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1 彭金莲 已出版文章查询
彭金莲
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1中国科学院广州地球化学研究所,中国科学院广州地球化学研究所,中国科学院广州地球化学研究所,中国科学院广州地球化学研究所 广东广州510640,广东广州510640,广东广州510640,广东广州510640


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利用批量平衡技术研究了石英、高岭石、伊利石、蒙脱石和铁氧化物对五氯苯酚(PCP)吸附的pH关系等温线和浓度关系等温线,发现所有矿物的pH关系等温线都表现出典型的峰形曲线特征,峰位在pH=5~6之间,依矿物不同而不同。基于矿物表面羟基位化合态和PCP的化合态考虑,提出一种包含表面络合反应和表面静电吸附反应的模式,对pH关系等温线计算拟合发现有很好的相关性。模式计算还表明,石英和层状硅酸盐矿物对PCP吸附以表面络合反应为主,而氧化铁矿物则包含表面络合反应和表面静电吸附反应,但以后者占主导,其反应平衡常数比前者大1~3个数量级。高岭石和氧化铁矿物的浓度吸附等温线可用Langmuir方程很好拟合,最大吸附量的大小顺序是赤铁矿>纤铁矿>针铁矿>高岭石>石英>蒙脱石≈伊利石,并可以用矿物表面羟基位浓度和反应机制加以解释。PCP在矿物表面可观的吸附量说明矿物表面吸附对憎水性可离解有机化合物(HIOCs)在天然水相体系和沉积中的迁移转化过程起着相当重要的作用。

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语种: 中文   

基金国家自然科学基金资助项目(40373045);广东省自然科学基金资助项目(030461)

关键词五氯苯酚 吸附 表面反应模式 铁氧化物 石英 层状硅酸盐矿物


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