pH 值对三丁基锡在活性炭和烟尘上吸附的影响。
The pH-dependent adsorption of tributyltin to charcoals and soot.
机构信息
Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
出版信息
Environ Pollut. 2010 Dec;158(12):3642-9. doi: 10.1016/j.envpol.2010.08.003. Epub 2010 Sep 15.
Widespread use of tributyltin (TBT) poses a serious environmental problem. Adsorption by black carbon (BC) may strongly affect its behavior. The adsorption of TBT to well characterized soot and two charcoals with specific surface area in the range of 62-111m(2)g(-1) have been investigated with main focus on pH effects. The charcoals but not soot possess acidic functional groups. TBT adsorption reaches maximum at pH 6-7 for charcoals, and at pH>6 for soot. Soot has between 1.5 and 15 times higher adsorption density (0.09-1.77μmolm(-2)) than charcoals, but charcoals show up to 17 times higher sorption affinities than soot. TBT adsorption is successfully described by a new pH-dependent dual Langmuir model considering electrostatic and hydrophobic adsorption, and pH effects on TBT speciation and BC surface charge. It is inferred that strong sorption of the TBTOH species to BC may affect TBT toxicity.
三丁基锡（TBT）的广泛使用带来了严重的环境问题。黑碳（BC）的吸附可能会强烈影响其行为。本研究采用具有不同比表面积（62-111m(2)g(-1)）的标准烟炱和两种木炭，重点考察了 pH 值对 TBT 吸附的影响。结果表明，木炭而非烟炱具有酸性官能团。对于木炭，TBT 的吸附在 pH 值为 6-7 时达到最大值，而对于烟炱，则在 pH 值大于 6 时达到最大值。烟炱的吸附密度（0.09-1.77μmolm(-2))比木炭高 1.5 至 15 倍，但木炭对 TBT 的吸附亲和力比烟炱高 17 倍。本研究通过一个新的 pH 值依赖的双朗缪尔模型成功描述了 TBT 的吸附，该模型考虑了静电和疏水吸附以及 pH 值对 TBT 形态和 BC 表面电荷的影响。可以推断，TBTOH 物种与 BC 的强吸附可能会影响 TBT 的毒性。
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