中文摘要：

在700，400℃条件下热解碳化杉木制得2种黑碳（BC700和BC400）．研究了海水体系中，pH和盐度影响下2种黑碳（BC）对三丁基锡（TBT）的吸附行为与机理．实验结果表明，BC700的比表面积较大，BCA00的有机质含量较高．盐度的增加（5-35g／kg）使Bc表面净电荷降低，静电作用减弱；但同时导致盐析效应增强，使TBT的有效浓度增大，综合结果导致2种Bc对TBT的吸附增加了1．03-2．12倍．当溶液pH为4．00和6．25时，TBT以离子（TBT＋）和中性（TBT）形态共同存在，而在pH为8．00时几乎全为中性态，分子形态的不同导致TBT与BC间的作用机理发生变化．TBT的最大吸附发生在pH=6．25时，这是静电作用、物理吸附和疏水分配等多种机制共同作用的结果．X射线光电子能谱（XPS）分析结果表明，Sn3d5/2峰结合能随着pH的降低而增加，证明TBT与BC之间存在静电作用．因此可以认为，TBT在BC700上的吸附主要为物理吸附和静电作用，而在BC400上的吸附则由疏水分配、物理吸附和静电吸引共同主导．

英文摘要：

Two BC（black carbon） samples, BC700 and BC400, were prepared from China fir wood by pyro- lytic charring at 700 and 400 ℃, respectively. The sorption behavior and mechanisms of tributyltin（TBT） on the two BC samples were evaluated as a function of seawater pH and salinity. The results indicated that BC700 had a higher specific surface area but lower content of organic matter than BC400. TBT sorption on BCT00 was primarily a physical adsorption process while hydrophobic partitioning also significantly contributed to TBT sorption on BC400. Increasing salinity from 5 to 35 g/kg facilitated TBT sorption by 1.03--2. 12 times as an overall result of the enhancing effective concentration of TBT because of ＇ salting-out＇ and the reducing role of electrostatic interaction because of BC surface charge neutralization. Environmental pH had a significant influ- ence to TBT forms in the solution. It was found that TBT existed in both cationic （TBT＋ ） and uncharged spe- cies at pH=4. 00 and 6.25 but mostly in uncharged species（TBT） at pH=8.00. TBT sorption reached maxi- mum at pH = 6.25, as compared to pH = 4.00 and 8.00, due presumably to multiple mechanisms involving electrostatic interaction, physical adsorption and hydrophobic partitioning between TBT and BC. In addition, XPS spectra showed that the binding energy of Sn3d5/2 peak shifted higher with decreasing pH, confirming the TBT-BC electrostatic interaction. Therefore, sorption of TBT on the BCT00 was mainly physical adsorption and electrostatic interaction while hydrophobic partitioning also significantly contributed to TBT sorption on BC400.