摘要
在海水介质中,模拟研究了厦门西港沉积物对Pb吸附过程的热力学和动力学性质,提出相应的定量模式,测定饱和吸附量、吸附速率常数和表观活化能等重要物化参数。结果表明,沉积物-Pb的吸附以化学作用为主,静电作用为辅。其吸附性质与水合氧化铁-Pb的吸附类似。
The adsorption of lead on sediment from effluent in Western Xiamen Harbour was simulated in relative seawater. It is found from the study that: (1) The suspended sediment in Western Xiamen Harbout shows high adsorption potential to lead with X_m≈1.5×10^(-3) and K_d≈3×10~4. The adsorption is closely related to pH. The adsorption efficiency reaches more than 90% at seawater pH. The salinity exerts certain effect on the adsorption efficiency(α), being α=101—0.68S. (2) The adsorption equilibrium is essentially reached within a few hours and the processes can be described by the exchangeadsorption model. The determined E≈29.3 kJ/mol suggests that the adsorption is dominated by chemical action. (3) The adsorption of Pb on sediment is similar to that of Cu and to that of Pb on ferric oxide, implying the importance of ferric oxide in the adsorption of heavy metals on sediment.
出处
《台湾海峡》
CAS
CSCD
1991年第3期240-244,共5页
Journal of Oceanography In Taiwan Strait
基金
国家海洋局海洋科学基金
