title: Effect of copper on the adsorption of p-nitrophenol onto soils.
abstract: The effect of copper on adsorption of p-nitrophenol on two typical Chinese soils was investigated using a batch-equilibration method. Adsorption experiments were carried out when both copper and p-nitrophenol were adsorbed simultaneously, and when copper was previously adsorbed on soils. It was observed that adsorption of p-nitrophenol decreased with increasing copper concentrations thereby indicating a competition between copper and p-nitrophenol for occupying the adsorption sites on soils. Moisture increased the hydrated sphere and the acidity of water surrounding the cation, which further reduced the adsorption of p-nitrophenol. Fourier transform infrared spectroscopy study provided the direct evidence for the coordination of p-nitrophenol sorbed by soils with metal cation in n-hexane system. It was observed that the perturbations included a red shift of the nu(asym) (NO) band, a concomitant blue-shift of the nu(sym) (NO) band and a blue-shift of C-N band when compared with the infrared spectra obtained from water solution.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
authors.forename: Zhi-guo
authors.initials: ZG
authors.lastname: Pei
authors.forename: Xiao-quan
authors.initials: XQ
authors.lastname: Shan
authors.forename: Bei
authors.initials: B
authors.lastname: Wen
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Zhang
authors.forename: Liangguo
authors.initials: L
authors.lastname: Yan
authors.forename: Shahamat U
authors.initials: SU
authors.lastname: Khan
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry*; D006586:Hexanes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009596:Nitrophenols / Q000737:chemistry*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods
chemical_list: D006586:Hexanes; D009596:Nitrophenols; D012987:Soil; D012989:Soil Pollutants; D003300:Copper; C024836:4-nitrophenol