- 作者: Rashid Ahmad* and Munir Ahmed
- 作者服務機構: Chemistry Division, Directorate of Science, Pakistan Institute of Nuclear Science & Technology (PINSTECH), P.O. Nilore, Islamabad, Pakistan
- 中文摘要: Zn(II) ions sorption onto N-Benzoyl-N-Phenylhydroxylamine (BPHA) impregnated polyurethane foam (PUF) has been studied extensively using radiotracer and batch techniques. Maximum sorption (~98%) of Zn(II) ions (8.9 ’ 10-6 M) onto sorbent surface is achieved from a buffer of pH 8 solution in 30 minutes using 7.5 mg/mL of BPHA-impregnated polyurethane foam at 283 K. The sorption data follow Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms. The Langmuir constants Q = 18.01 ± 0.38 μ mole g-1 and b = (5.39 ± 0.98) ’ 103 L mole-1 have been computed. Freundlich constants l/n = 0.29 ± 0.01 and Cm = 111.22 ± 12.3 μ mole g-1 have been estimated. Sorption capacity 31.42 ± 1.62 μmole g-1, b = -0.00269 ± 0.00012 kJ2 mole-2 and energy 13.34 ± 0.03 kJ mole-1 have been evaluated using D-R isotherm. The variation of sorption with temperature yields ΔH = –77.7 ± 2.8 k J mole–1, ΔS = –237.7 ± 9.3 J mole–1 K–1 and ΔG = -661.8 ± 117.5 k J mol–1 at 298 K reflecting the exothermic and spontaneous nature of sorption. Cations like Fe(III), Ce(III), Al(III), Pb(II) and Hg(II) and anions, i.e., oxalate, EDTA and tartrate, reduce the sorption significantly, while iodide and thiocyanate enhanced the sorption of Zn(II) ions onto BPHA-impregnated polyurethane foam.
- 英文摘要: --
- 中文關鍵字: Zn(II) ions; BPHA-impregnated polyurethane foam; Radiotracer techniques; Sorption isotherms; Kinetics and thermodynamics.
- 英文關鍵字: --