水环境中泥沙颗粒与重金属污染物的微界面作用显著,泥沙颗粒表面形貌特征对污染物的吸附影响较大。通过单一吸附和竞争吸附试验、BET试验,分析了泥沙颗粒吸附铅、铜和镉后,泥沙颗粒孔隙的孔体积和比表面积的结构特征变化,并基于孔隙的孔体积统计方法,定量化铅、铜和镉在泥沙颗粒的竞争和独立吸附点位。结果表明,2~5 nm中孔的孔隙为主要的吸附部位。铅在泥沙颗粒所占据的竞争吸附点位较铜和镉多,为43.69%,铜和镉分别为30.77%、25.54%,铅、铜和镉占据泥沙颗粒的竞争吸附点位能力为铅>铜>镉。研究结果从纳米尺度揭示了吸附量与微观吸附点位的关系,可以为研究竞争吸附点位特征提供新思路。
Abstract
The micro-interfacial interactions between sediment particles and heavy metal pollutants in aquatic environment are significant, with the surface morphological characteristics of sediment particles greatly influencing pollutant adsorption. Through both singular adsorption and competitive adsorption experiments, alongside BET (Brunauer-Emmett-Teller) analysis, we investigated the changes in structural characteristics such as pore volume and specific surface area of sediment particles after adsorbing Pb, Cu, and Cd. Furthermore, utilizing pore volume statistical methods, we quantitatively differentiated between the competitive and individual adsorption sites of Pb, Cu, and Cd on sediment particles. The findings indicate that mesopores ranging from 2 to 5 nm predominantly facilitate adsorption. Pb occupies more competitive adsorption sites on sediment particles than Cu and Cd, accounting for 43.69%, with Cu and Cd occupying 30.77% and 25.54%, respectively. Thus, Pb has the largest capacity of occupying competitive adsorption sites on sediment particles, followed by Cu and Cd in descending order. These results unveil the relationship between adsorption capacity and micro-adsorption sites at the nanoscale, providing new insights into the characteristics of competitive adsorption sites.
关键词
泥沙颗粒 /
铅-铜-镉体系 /
BET实验 /
孔隙特征 /
竞争点位
Key words
sediment particle /
Pb-Cu-Cd system /
BET experiment /
pore characteristics /
competitive sites
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