게껍질에 의한 수중의 납 이온 제거

Abstract

Several effects on Pb<TEX>$^{2+}$</TEX> removal by crab shell from aqueous solution were investigated. As the increase of initial Pb<TEX>$^{2+}$</TEX> concentration and decrease of initial crab shell concentration, the time required to reach an equilibrium state and the residual Pb<TEX>$^{2+}$</TEX> concentration increased. In our experimental ranges, the optimum initial Pb<TEX>$^{2+}$</TEX> concentration and crab shell concentration were below 103 mg/<TEX>$\ell$</TEX> and over 0.5 mg/<TEX>$\ell$</TEX>, respectively. Also, in order to investigate the mechanism of Pb<TEX>$^{2+}$</TEX> removal by crab shell in aqueous solution, the crab shell was compared with chitosan and chitin on aspects of Pb<TEX>$^{2+}$</TEX> removal capacity and Pb<TEX>$^{2+}$</TEX> removal rate. The Pb<TEX>$^{2+}$</TEX> removal by crab shell was greater than that by chitin and chitosan. The role of chitin was not so great in Pb<TEX>$^{2+}$</TEX> removal by crab shell. The Pb<TEX>$^{2+}$</TEX> removal by chitosan was not exactly correlated to the molecular weight of chitosan. weight of chitosan.