Biosorption of Metal Ions by Seaweed Alginate, Polyguluronate, and Polymannuronate

$P_{1/2}$ 값을 참고로 비교한 알긴산, 폴리글루론산 및 폴리만뉴론산의 금속이온들에 대한 상대적인 친화성은 다음과 같다; 1) 알긴산: $Cu^{2+}$ > $Cd^{2+}$ > $Pb^{2+}$ > $Fe^{3+}$ >> $Zn^{2+}$ > $Sr^{2+}$ > $Ca^{2+}$ > $Co^{2+}$ >> $Cr^{6+}$ > $Mn^{2+}$ >> $Hg^{2+}$ , $Mg^{2+}$ , $Rb^+$ , 2) 폴리글루론산: $Cd^{2+}$ > $Cu^{2+}$ > $Pb^{2+}$ > $Fe^{3+}$ >> $Ca^{2+}$ > $Sr^{2+}$ , $Zn^{2+}$ , $Co^{2+}$ >> $Mn^{2+}$ > $Cr^{6+}$ >> $Hg^{2+}$ , $Mg^{2+}$ , $Rb^+$ , 그리고 3) 폴리만뉴론산: $Cd^{2+}$ , $Cu^{2+}$ > $Fe^{3+}$ > $Pb^{2+}$ > $Ca^{2+}$ > $Zn^{2+}$ > $Sr^{2+}$ > $Co^{2+}$ > $Cr^{6+}$ >> $Mn^{2+}$ >> $Hg^{2+}$ , $Mg^{2+}$ , $Rb^+$ . 알기산 1 g에 흡착하는 $Cd^{2+}$ , $Cu^{2+}$ , $Fe^{3+}$ , $Pb^{2+}$ , 및 $Zn^{2+}$ 의 양은 $363.5{\pm}45.0$ , $226.3{\pm}9.2$ , $1,299.4{\pm}$ 81.3, 500.7 ${\pm}$ 27.7 및 165.9 ${\pm}$ 11.4 mg이었으며, 폴리글루론산 1g에 흡착하는 $Cd^{2+}$ , $Cu^{2+}$ , $Fe^{3+}$ , $Pb^{2+}$ , 및 $Zn^{2+}$ 의 양은 354.5 ${\pm}$ 26.5, 177.6 ${\pm}$ 8.7, 1,288.6 ${\pm}$ 60.1, 424.0 ${\pm}$ 7.4 및 140.2 ${\pm}$ 28.5 mg이었으나, 폴리만뉴론산 1 g에 흡착하는 $Cd^{2+}$ , $Cu^{2+}$ , $Fe^{3+}$ , $Pb^{2+}$ , 및 $Zn^{2+}$ 의 양은 329.0 ${\pm}$ 10.3, 226.9 ${\pm}$ 1.9, 1,635.6 ${\pm}$ 11.1, 419.8 ${\pm}$ 12.6 및 251.0 ${\pm}$ 49.1 mg이었다. 폴리만뉴론산은 알긴산보다 높은 용해도와 폴리글루론산보다 높은 금속이온에 대한 친화성 때문에 독성이 높은 중금속이나 경제성이 높은 금속을 선택적으로 분리하는 데 사용할 수 있을 것이다. Based on $P_{1/2}$ values, relative affinities of alginate, polyguluronate, and polymannuronate for metal ions are, in order, as follows; 1) seaweed alginate: $Cu^{2+}$ > $Cd^{2+}$ > $Pb^{2+}$ > $Fe^{3+}$ >> $Zn^{2+}$ > $Sr^{2+}$ > $Ca^{2+}$ > $Co^{2+}$ >> $Cr^{6+}$ > $Mn^{2+}$ >> $Hg^{2+}$ , $Mg^{2+}$ , $Rb^+$ , 2) polyguluronate: $Cd^{2+}$ > $Cu^{2+}$ > $Pb^{2+}$ > $Fe^{3+}$ >> $Ca^{2+}$ > $Sr^{2+}$ , $Zn^{2+}$ , $Co^{2+}$ >> $Mn^{2+}$ > $Cr^{6+}$ >> $Hg^{2+}$ , $Mg^{2+}$ , $Rb^+$ , and 3) polymannuronate: $Cd^{2+}$ , $Cu^{2+}$ > $Fe^{3+}$ > $Pb^{2+}$ > $Ca^{2+}$ > $Zn^{2+}$ > $Sr^{2+}$ > $Co^{2+}$ > $Cr^{6+}$ >> $Mn^{2+}$ >> $Hg^{2+}$ , $Mg^{2+}$ , $Rb^+$ . Amounts of the metal ions, $Cd^{2+}$ , $Cu^{2+}$ , $Fe^{3+}$ , $Pb^{2+}$ , and $Zn^{2+}$ , bound to 1 g of seaweed alginate, were measured as $363.5{\pm}45.0$ , $226.3{\pm}9.2$ , $1,299.4{\pm}$ 81.3, 500.7 ${\pm}$ 27.7, and 165.9 ${\pm}$ 11.4 mg, respectively. Amounts of the metal ions, $Cd^{2+}$ , $Cu^{2+}$ , $Fe^{3+}$ , $Pb^{2+}$ , and $Zn^{2+}$ , bound to 1g of polyguluronate, were 354.5 ${\pm}$ 26.5, 177.6 ${\pm}$ 8.7, 1,288.6 ${\pm}$ 60.1, 424.0 ${\pm}$ 7.4, and 140.2 ${\pm}$ 28.5 mg, respectively, whereas those bound to 1 g of polymannuronate were 329.0 ${\pm}$ 10.3, 206.9 ${\pm}$ 1.9, 1,635.6 ${\pm}$ 11.1, 419.8 ${\pm}$ 12.6, and 251.0 ${\pm}$ 49.1 mg, respectively. Due to its higher solubility than alginate and higher affinity for metal ions than polyguluronate, polymannuronate can be used for bioremediation or biosorption of toxic and/or noble metal ions.