These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Different modes of adsorptions of arsenate on silica grafted with Fe3+-coordinated silanes.
    Author: Otsuka R, Yoshitake H.
    Journal: J Colloid Interface Sci; 2014 Feb 01; 415():143-50. PubMed ID: 24267341.
    Abstract:
    In order to optimize the adsorption of arsenate, we prepared silica based adsorbents by grafting Fe(3+)-coordinated N-(2-aminoethyl)-3-aminopropyltriethoxysilanes (aeaptes) in various Fe:aeaptes ratios (mixing ratios). Two kinds of mesoporous silica (MCM-41 and SBA-15) and fumed silica (Cab-O-sil M7D) were used as substrates. The adsorption of arsenate saturated at As/Fe=1, 2 and 3 on mesoporous silica based adsorbents from with Fe:aeaptes ratios of 1:1, 1:2 and 1:3, respectively. On the other hand, saturation occurred at As/Fe=1 on Cab-O-sil M7D-based adsorbents for all three Fe:aeaptes ratios. In addition to this dependence of the adsorption on the coordination conditions, two different modes were clearly distinguished in the adsorption isotherm for the MCM-41 based adsorbent prepared with a Fe:aeaptes ratio of 1:1. These two distinct adsorptions are likely to be due to the induction of well-defined coordination structures by this method. This result is significantly different from that found in a previous study where adsorbents were prepared by the grafting of aeaptes followed by the coordination of Fe(3+), where a single mode of adsorption was observed. The adsorptions were further analyzed using the Langmuir equation and by X-ray adsorption spectroscopy.
    [Abstract] [Full Text] [Related] [New Search]