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Journal of colloid and interface science v.512, 2018년, pp.629 - 637   SCI SCIE
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A novel and efficient method on the recovery of nanosized CeO2 in Ce3+ wastewater remediation using modified sawdust as adsorbent

Gao, Shan (Department of Chemistry, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China ) ; Luo, Tiantian (Department of Chemistry, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China ) ; zhou, Qi (School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China ) ; Luo, Wenjun (Department of Chemistry, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China ) ;
  • 초록  

    Abstract In this study, by using heterogeneous esterification reaction and UV photo-induced technology, dendritic polyacrylic acid (PAA) was successfully grafted on to the surface of pinewood sawdust (PSD) particles to be used as an adsorbent and recovery medium for Ce 3+ from wastewater. 18 alkyl acid (stearic acid, SA), as a pre-modifier, was grafted onto the PSD surface. The outcome was the replacement of hydroxyl groups by hydrocarbon chains. Therefore, rich hydrogen atoms of the hydrocarbon chains on the PSD particles became sites whom can be taken away by photosensitizer molecules to form surface radicals. Acrylic molecules can be initiated polymerization by these radicals, PAA chains were grafted on to PSD surface via “grafting from” method, forming dendritic functional polymer layers around the PSD particles. The end product (PSD- g -PAA) have a good adsorption performance for Ce 3+ (adsorption capacity reached 153.90mg/g), can be used as a carrier to recycle the Cerium oxide. And desorption and reusability experiment suggested that the adsorption capacity was virtually unchanged after five cycles and the desorption rate is almost 100% in every cycle. The adsorption achieves equilibrium after about 120min. The kinetic and thermodynamic investigations as well as isotherm analysis were also undertaken. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Sawdust .   Surface grafting modification .   UV irradiation .   Recycle carrier .   Adsorption .   Recycling rare earth ions.  

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