Rate effected adsorption profile of selenium-thiocyanate complex onto polyurethane foam
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Muhammad M. Saeed
Summary
The sorption of preheated selenium-thiocyanate complexes onto polyurethane (PUR) foam has been studied as a function of equilibration time (1–60 min), concentration of selenium (3.80 × 10−4 −4.39 × 10−3 M) and amount of PUR foam. Maximum sorption (> 98%) has been achieved from 0.5 M hydrochloric acid solution within 20 minutes using 7.25 mg/cm3 PUR foam in the presence of 3.75 × 10−2 M thiocyanate ions. The sorption data have been subjected to Langmuir, Freundlich and Dubinin-Radushkevich (D–R) isotherms. The Freundlich parameters 1/n = 0.25 ± 0.02 and of KF = 1.7 ± 0.2 mmole g−1, Langmuir constants M = 0.23 ± 0.01 mmole g−1 and of b = 23 ± 2 dm3 mmole−1 and of D-R constants, Cm = 0.82 ± 0.04 mmole g−1, β = −0.0032 ± 0.0002 mole2 kJ−2 and of E = 12.5 ± 0.2 kJ mole−1 have been evaluated. The kinetic data have been subjected to Morris-Weber, Lagergren and Reichenberg equations and rate constants of intraparticle transport and first order have been computed. Thermodynamic parameters of enthalpy, entropy and Gibbs free energy suggest the endothermic and spontaneous adsorption of Se(IV)-SCN complex onto PUR foam at higher temperature. The influence of common anions and cations on the accumulation of selenium-thiocyanate onto PUR foam has been carried out. The possible sorption mechanism has also been discussed.
© Oldenbourg Wissenschaftsverlag, München
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Articles in the same Issue
- Excitation functions of proton induced reactions on 68Zn from threshold up to 71 MeV, with specific reference to the production of 67Cu
- X-ray absorption fine structure spectroscopy of plutonium complexes with bacillus sphaericus
- Separation of neptunium and plutonium from acidic medium using 3-phenyl-4-benzoyl-5-isoxazolone
- A statistical study of 238U and 234U/238U distributions in coral samples from the Egyptian shoreline of the north-western Red Sea and in fossil mollusk shells from the Atlantic coast of High Atlas in Morocco: Implications for 230Th/234U dating
- Ion-molecule reactions of Ru+ and Os+ with oxygen in a Penning trap
- Inner-sphere, outer-sphere and ternary surface complexes: a TRLFS study of the sorption process of Eu(III) onto smectite and kaolinite
- Radiochemical neutron activation analysis of total trace tin and determination of its differentiated compounds in aquatic biota
- Rate effected adsorption profile of selenium-thiocyanate complex onto polyurethane foam
- Production and radiochemical separation of rhodium-105 for radiopharmaceutical applications
