We are currently developing porous materials for the effective removal of mixtures of heavy metal compounds from aqueous solutions, both as normal adsorbents and as electrosorbents. An electrochemical cell with a fixed bed of adsorbent as one of the electrodes has been constructed in order to investigate the electrochemical behavior of adsorbents with various adsorbates. Here we present our initial results from chronoamperometry experiments of the electrosorption of arsenic on DARCO lignite char. We also report on the adsorption of arsenic and chromium solutions and their mixtures on Davankov-type hypercrosslinked resins (1,120m2g-1). It was found that the equilibration time for 500 ml of an As solution with an initial concentration of 100 ppb on 62 mg of resin was greater than 24h. At this point, the non–equilibrium adsorption was 0.00015 g As/g. It was observed that for co-adsorption of arsenic and chromium, the rate of chromium uptake is more rapid than that of arsenic and the presence of chromium decreases total arsenic adsorption.
|Publication status||Published - Aug 2007|
|Event||234th ACS National Meeting - Boston, United States|
Duration: 19 Aug 2007 → 23 Aug 2007
|Conference||234th ACS National Meeting|
|Period||19/08/07 → 23/08/07|