Preparation of a biomass adsorbent for gallium(III) based on corn stalk modified by iminodiacetic acid

Add time:07/18/2019    Source:sciencedirect.com

In order to replace extractant or resin prepared from petrochemical products, a series of carboxyl-functionalized materials based on natural corn stalk (x-IDA-EPI-OCS) were prepared. When the mass ratio of the EPI-OCS and iminodiacetic acid (IDA) was 1:3, the uptake capacity of Ga(III) on the modified corn stalk (3-IDA-EPI-OCS) from acidity solution could react 139.56 mg g−1. More importantly, the 3-IDA-EPI-OCS could completely separate Ga(III) from Ga(III)–As(III) or/and Ga(III)–Ge(IV) binary mixtures at pH > 2. By analyzing the results of acidity test as well as that of FTIR and XPS, the adsorption mechanism was deduced as cation exchange between Ga3+, Ga(OH)2+or Ga(OH)2+ and the hydrogen ions of carboxyl groups and/or hydroxyl groups. This study provided an effective and economical method for recovery of gallium ions from aqueous solution.

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