RP1 Environmental Changes in Response to China's Economic Expansion
Thursday, 17 November 2005: 8:00 AM - 6:30 PM in Exhibit Hall

(LIU-1117-678973) Biosorption of copper on the surface of Ulva pertusa.

Liu, C.-F.¹, Jiang, L.², Zhang, J.³, Wei, H.-F.⁴, He, J.⁵, ¹ Dalian Fisheries University, Dalian, Liaoning, China² Dalian Fisheries University, Dalian, Liaoning, China³ Dalian Fisheries University, Dalian, Liaoning, China⁴ Dalian Fisheries University, Dalian, Liaoning, China⁵ Dalian Fisheries University, Dalian, Liaoning, China

ABSTRACT- Biosorption of copper(II) has been investigated on the surface of Ulva pertusa, a macroalgae, with respect to adsorption temperature using differential pulse anodic stripping voltammetry (DPASV). The grade adsorption isotherm was found to fit the experimental results well for the adsorption of copper(II) up to concentration 7 mmol/L by U. pertusa. Both of first-order and second-order adsorption can describe as "saturation type". At temperature 7.5°C, 15.0°C, 22.5 °C, the pK₁ and pK₂ according to grade adsorption isotherm were 1.074, 3.197; 1.277, 3.087; and 1.451, 3.032, respectively. The equilibrium constant may be expressed in terms of enthalpy change of biosorption. The first-order and second-order biosorption indicate exothermic and endothermic reaction, respectively.

Key words: Biosorption, Copper, Ulva pertusa