Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Selective adsorption for indium(III) from industrial wastewater using chemically modified sawdust

  • Kwon, Taik-Nam (Department of Biochemical Engineering, Gangneung-Wonju National University) ;
  • Jeon, Choong (Department of Biochemical Engineering, Gangneung-Wonju National University)
  • Received : 2012.02.08
  • Accepted : 2012.05.19
  • Published : 2012.12.01
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Abstract

To selectively adsorb indium(III) in industrial wastewater coexisting with zinc(II), the surface of sawdust was modified into phosphate groups through chemical reaction. Among various manufacturing methods, phosphorylated sawdsust made from using non-grinding sawdust with same ratio (based on volume) of $H_3PO_4$ and distilled water had a very high selectivity to indium(III), which shows removal efficiency of about 90% with 1.0 g at pH 3.5. Meanwhile, in case of zinc(II), there is almost no adsorption onto phosphorylated sawdust. The surface condition and phosphorus content of phosphorylated sawdust were analyzed by scanning electron microscopy (SEM) photograph and energy dispersive x-ray (EDX) spectrum. Also, the effects of loading of adsorbent and time on selective adsorption characteristics of indium(III) were investigated.

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