Sequestration of Cu(II), Ni(II), and Co(II) by ethyleneimine immobilized on silica

Arakaki LNH; Alves APM; da Silva EC; Fonseca MG; Oliveira SF; Espinola JGP; Airoldi C

Thermochimica Acta, Vol.453, No.1, 72-74, 2007

DOI10.1016/j.tca.2006.10.016 Export Citation

Sequestration of Cu(II), Ni(II), and Co(II) by ethyleneimine immobilized on silica

Arakaki LNH, Alves APM, da Silva EC, Fonseca MG, Oliveira SF, Espinola JGP, Airoldi C

Thermodynamic data on interaction of Cu(II), Ni(II), and Co(II) with silica modified with ethyleneimine are obtained by calorimetric titration. The amount of ethyleneimine anchored on silica surface was estimated to be 0.70 mmol g(-1). The enthalpies of binding Ni(II), Cu(II) and Co(II), are -3.59 +/- 0.001, -4.88 +/- 0.001, and -7.75 +/-0.003 kJ mol(-1), respectively. (c) 2006 Elsevier B.V. All rights reserved.

Keywords:chelating centers;silica gel;adsorption;calorimetry;thermochemical data