| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 91 === The competitive adsorption of Cu(II), Pb(II), Ni(II), Cd(II), sulfate and oxylate onto Al2O3 was investigated in this research. It involved the effect of background electrolyte concentrations, competitive adsorption and triple-layer model (TLM) simulation to explore the adsorption reaction express.
Result indicated that the effect of background electrolyte on Cu(II) , Pb(II), Ni(II), Cd(II) and oxylate adsorption at a given pH was fairly insignificant, but signify in sulfate. The competitive adsorption ability showed in Pb(II)>Cu(II)>Ni(II)>Cd(II) weather two metal mixing or more. Although Pb(II) adsorptive percentage was more than Cu(II) in acidy pH range, the Ksp of Cu(II) (1.6×10-19) is smaller than Pb(II) (1.2×10-15), therefore, when above pH 5.8, Cu(II) is deposited. According to competitive adsorption, the existence of Pb(II) or Cu(II) might restrain Ni(II) or(and) Cd(II) adsorption. Metal ions simulating inner-sphere adsorption had reasonable results and the intrinsic equilibrium constant LogKeqint were 0.4, 0.5, -2.2, and -2.9 for Cu(II), Pb(II), Ni(II), and Cd(II), however, Sulfate and oxylate were simulated in outer-sphere adsorption and the intrinsic equilibrium constant LogKeqint were 10(SO42-), 15.5(HSO4-), 16(C2O42-), 15(HC2O4-).
This resarch was showed that inner-sphere adsorption species restrain each other, such as Ni(II) and Cd(II) and the same in outer-shpere and TLM predicted well in qualitative analysis.
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