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Study on velocity and interference of copper binding

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Document pages: 14 pages

Abstract: The Cu (II) binding capacity of humic acid biomass immobilized on silica was determined by batch and column experiments. For the column study, 500 bed volumes of 0.1 mm Cu (II) solution were passed through the humin packed column at flow rates of 1, 1.5, 2 and 3 ml min. The average Cu binding capacity of biopolymer was 12 ± 1.5 mg g, and the Cu recovery was about 96.5 ± 1.5 . At the flow rates of 1, 1.5, 2 and 3 ml min, the breakthrough points of Cu (II) alone are about 420, 390, 385 and 300 bed volumes, respectively. Interference studies show that at low concentrations, hard cations Ca (II) and Mg (II) do not seem to represent the main interference on the binding of Cu (II) to humic acid biopolymers. The selectivity of the biopolymer is Cu (II) > Ca (II) > Mg (II). Onthe other hand, batch experiments showed that Ca(II) + Mg(II) at 100mM each reduced the Cu(II) binding to 73 . However, 1000 mM concentrations of Ca(II) and Mg(II), separately and in mixture, reduced the Cu(II) binding to 47 , 44 and 31 , respectively. The results of this study showed that immobilized humin in a silica matrix could represent an inexpensive bio-source for Cu removal from contaminated water, even in the presence of low concentrations of the hard cations Ca(II) and Mg(II).

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