title: Investigation of the adsorption characteristics of natural organic matter from typical Chinese surface waters onto alumina using quartz crystal microbalance with dissipation.
abstract: 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 25ngcm(-2) and 64ngcm(-2), and these showed significant correlation with geographical location, and NOM character and concentrations. Adsorbed mass correlated with DOC concentration (slope k=0.0676, R(2)=0.61) and hydrophobic acid (HoA) and weakly hydrophobic acid (WHoA) (k=0.0342 and 0.0183; R(2)=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 ΔD/Δf ratio and viscosity of adsorbed layer with injected time. The adsorbed layer viscosity increased exponentially with injected time (R(2)>0.99) for most samples. Samples with low DOC concentration (k=-1091.8, R(2)=0.55) and low content of HoA and WHoA (k=-524.33 and -322.76; R(2)=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.
authors.affiliation: Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China. yanmq@pku.edu.cn
authors.forename: Mingquan
authors.initials: M
authors.lastname: Yan
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Wang
authors.forename: Jiankun
authors.initials: J
authors.lastname: Xie
authors.forename: Chunxia
authors.initials: C
authors.lastname: Liu
authors.forename: Jixia
authors.initials: J
authors.lastname: Cheng
authors.forename: Christopher W K
authors.initials: CW
authors.lastname: Chow
authors.forename: John
authors.initials: J
authors.lastname: van Leeuwen
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D002681:China; D002850:Chromatography, Gel; D057927:Hydrophobic and Hydrophilic Interactions; D058525:Quartz Crystal Microbalance Techniques; D045483:Rivers; D014873:Water Pollutants / Q000737:chemistry*
chemical_list: D014873:Water Pollutants; D002244:Carbon; D000537:Aluminum Oxide