Abstract
The paper aims to present research results obtained at the study of equilibrium and kinetics of U(VI)aq sorption on in situ generated Fe2O3 x nH2O from model solutions. The studied systems represent U(VI) solutions with CU(VI) = 5-30 mg·L-1 for which maximum U(VI) removal efficiencies (%RU(VI) = 95.98) on in situ generated Fe2O3’”nH2O were obtained in the following working conditions: pH = 8.75, tcontact = 30 min, : =1:75 and stirring rate 250 RPM. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were used to study U(VI) sorption equilibrium. Langmuir isotherm with the correlation coefficient R2 (0.9808) suggests that it involves physical interactions. Freundlich (R2 = 0.8349) and Temkin (R2 = 0.8715) models describe well the sorption process suggesting that there also exists a chemical component, complexing and/or co-precipitation. The kinetic modelling according to the pseudo-first and pseudo-second order models, respectively has demonstrated that the U(VI) sorption equilibrium follows the pseudo-second order equation suggesting a chemical component of the process. Keywords: uranium, sorption/precipitate flotation, adsorption isotherms modelling, kinetics
Highlights
[TsgsUooehrln(eupVettpiIrio)oaa]nntpes:edowr[nFFaieteiihnm(2OICIssI3U)i’(t”t]VuonI)=H=gpe12rO5en:7-se35wer0naeamttrneergdde·LosFseb-e1taitf2raoOrrciirn3nhwegxdrherniasicHnuthe2lOttmhs2e5afor0xobfoimtmRallPiounmMwmeod.inUdgaeT(tVlhwtIseh)ooerrLlekuasmitntniuooggdnvmcsya.oulonTeifrdfh,feieiFtcqiriosueetninuulsicndb:idirepeilsuHdicm(h%s=y,RasTn8tUee(.dV7mmI)5k=ks,initnrc9eeo5ntpati.a9crncet8sds=)oeoDfnn3utU0ibUn(imVn(sIViii)ntnIau)q, Radushkevich isotherm models were used to study U(VI) sorption equilibrium
The residual concentration of U(VI) was analyzed to calculate the equilibrium adsorption capacity according to the following equation [31]: (1)
Langmuir model The Langmuir isotherm assumes that uptake of metal ions occurs on a homogenous surface by monolayer adsorption and a constant sorption potential [28, 29]
Summary
[TsgsUooehrln(eupVettpiIrio)oaa]nntpes:edowr[nFFaieteiihnm(2OICIssI3U)i’(t”t]VuonI)=H=gpe12rO5en:7-se35wer0naeamttrneergdde·LosFseb-e1taitf2raoOrrciirn3nhwegxdrherniasicHnuthe2lOttmhs2e5afor0xobfoimtmRallPiounmMwmeod.inUdgaeT(tVlhwtIseh)ooerrLlekuasmitntniuooggdnvmcsya.oulonTeifrdfh,feieiFtcqiriosueetninuulsicndb:idirepeilsuHdicm(h%s=y,RasTn8tUee(.dV7mmI)5k=ks,initnrc9eeo5ntpati.a9crncet8sds=)oeoDfnn3utU0ibUn(imVn(sIViii)ntnIau)q-, Radushkevich isotherm models were used to study U(VI) sorption equilibrium. Uranium mining activity continues to be a major source of radioactive environmental pollution by producing huge amounts of low radioactive wastes heaped around the mining galleries and large quantities of wastewaters [1] It is present in the sea-water and it can contaminate the fish [2]. Uranium contaminated mine water with low content of U(VI) (1-10 mg.L-1) is a challenge for the classic treatment methods such as ion exchange, solvent extraction, adsorption on different supports due to their specific drawbacks [1]. The solution to this problem is sorption/precipitate flotation process [1]. SfritoumgeanesryantethdeFteic2Os3o1l.unHtio2On was chosen as natural to an remove alogue, considering that occurring one and the was system largely inUv(eVsIt)ig-Faete-dH2[O8-1is5]n. atural
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