Investigation of the adsorption characteristics of natural organic matter from typical Chinese surface waters onto alumina using quartz crystal microbalance with dissipation

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• 作者：Mingquan Yan^a ; ^{yanmq@pku.edu.cn} ; Dongsheng Wang^b ; ^e ; Jiankun Xie^b ; Chunxia Liu^c ; Jixia Cheng^c ; Christopher W.K. Chow^b ; ^d ; ^e ; John van Leeuwen^b ; ^e
• 关键词：Adsorption ; Natural organic matter ; QCM-D ; Adsorbed layer
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 May, 2012
• 卷：215-216
• 期：Complete
• 页码：115-121
• 文件大小：1485 K

摘要

The adsorption of natural organic matter (NOM) from eight typical Chinese surface waters onto alumina was investigated using quartz crystal microbalance with dissipation monitoring (QCM-D). The adsorbed masses of NOM varied between 25 ng cm^鈭? and 64 ng cm^鈭?, and these showed significant correlation with geographical location, and NOM character and concentrations. Adsorbed mass correlated with DOC concentration (slope k = 0.0676, R² = 0.61) and hydrophobic acid (HoA) and weakly hydrophobic acid (WHoA) (k = 0.0342 and 0.0183; R² = 0.49 and 0.52 for HoA and WHoA, respectively) constituents present in the water samples. The process of adsorbed layer formation was investigated from changes in the 螖D/螖f ratio and viscosity of adsorbed layer with injected time. The adsorbed layer viscosity increased exponentially with injected time (R² > 0.99) for most samples. Samples with low DOC concentration (k = 鈭?091.8, R² = 0.55) and low content of HoA and WHoA (k = 鈭?24.33 and 鈭?22.76; R² = 0.41 and 0.64 for HoA and WHoA, respectively), the slope of logarithm viscosity value is steeper, the property of adsorbed layer and NOM is more inconsistent. The QCM-D technique provides a method to view the process of complexation between NOM and coagulant, and can provide useful information to establish a quantitative calculation model of the coagulation process.