Title of article :
Removal of organic polyelectrolytes and their metal complexes by adsorption onto xonotlite
Author/Authors :
Hideyuki Katsumata، نويسنده , , Satoshi Kaneco، نويسنده , , Rika Matsuno، نويسنده , , Kumiko Itoh، نويسنده , , Kazuaki Masuyama، نويسنده , , Tohru Suzuki، نويسنده , , Kunihiro Funasaka، نويسنده , , Kiyohisa Ohta، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
7
From page :
909
To page :
915
Abstract :
Natural organic polyelectrolytes (humic and fulvic acids) and their metal complexes were removed by adsorption onto xonotlite. The removal percentages of humic and fulvic acids by xonotlite were ≈80% and 30%, respectively. Humic acid removal from solution by adsorption onto xonotlite took place more readily than fulvic acid removal. The molecular weight distributions of the humic substances remaining in solution after adsorption with the xonotlite were measured with size exclusion chromatography. A comparison of molecular weight distributions demonstrated conclusively that large molecular weight components were adsorbed preferentially, indicating that adsorption efficiency depends on the number of functional groups of humic substances. Furthermore, the surface topography of the adsorbent was observed before and after adsorption by scanning electron microscopy. The calculated heat of adsorption was of 330 kJ mol−1 which was evaluated from the Clapeyron–Clausius equation. Therefore, the adsorption type can be considered chemical. Since xonotlite can be easily synthesized and obtained at low cost, the adsorption method of humic and fulvic acids is superior to their precipitation.
Keywords :
Humic substances removal , Metal complex , Xonotlite , size exclusion chromatography , Adsorption mechanism
Journal title :
Chemosphere
Serial Year :
2003
Journal title :
Chemosphere
Record number :
736795
Link To Document :
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