Uranium removal from aqueous solution by coir pith: equilibrium and kinetic studies

Parab, Harshala; Joshi, Shreeram; Shenoy, Niyoti; Verma, Rakesh Kumar; Lali, Arvind; Sudersanan, M.

doi:10.1016/j.biortech.2004.10.016

Cited by 186 publications

(62 citation statements)

References 21 publications

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“…The CP can be converted into good manure after 30 to 40 days, and can be applied to a wide variety of crops, used to prepare potting mixture and used as organic manure in kitchen gardens. The ability of CP to remove uranium from aqueous solutions has been demonstrated (Parab et al 2005). Anion exchangers with different functionalities have been prepared from CP, which are effectively and inexpensively decontaminates wastewaters rich in heavy metals (Anirudhan and Unnithan 2007).…”

Section: Introductionmentioning

confidence: 99%

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

2009

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Coir pith obtained from the coir industry as waste biomass was used to prepare activated carbon by chemical activation using phosphoric acid (H 3 PO 4 ). The influences of activation temperature and lasting time of activation on specific surface areas (SSA) of the activated carbons were observed. Physical characteristics of the activated carbon were investigated using X-ray diffraction (XRD), infrared spectroscopy (IR), surface area analyzer, scanning electron microscopy (SEM), thermal analysis and potentiometric titration. The feasibility of using activated carbon for the removal of phenol (P), p-chlorophenol (PCP) and pnitrophenol (PNP) from water and petroleum refinery industry effluents was investigated. The effects of contact time, adsorbent dose, ionic strength and initial concentration on the adsorption of phenols onto the activated carbon were investigated. The optimum pH for the maximum removal of phenols was 6.0. The equilibrium adsorption data of phenols were correlated to Langmuir and Freundlich isotherm models, the latter being the best fit of the experimental data. Dynamics of the sorption process and mass transfer were investigated using McKay and Urano-Tachikawa models. Adsorption kinetic data fits the Urano-Tachikawa kinetic model. The utility of the adsorbent was tested by using petroleum refinery industry effluent. The adsorbed phenols can be recovered by treatment with 0.1 M NaOH solution.

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Section: Introductionmentioning

confidence: 99%

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

2009

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“…By increasing the pH beyond 4.2, the uranium adsorption efficiency was deceasing from 4.2 to 8. 2 , which increase uranium (VI) adsorption [23,24].…”

Section: Resultsmentioning

confidence: 99%

“…R L value indicate the type of isotherm to be irreversible (R L =0), favorable (0<R L <1), linear (R L =1) and unfavorable (R L >1) [24,32].…”

Section: Langmuir Isothermmentioning

confidence: 99%

Uranium Adsorption from Aqueous Solution Using Sodium Bentonite Activated Clay

Wm¹

2017

J Chem Eng Process Technol

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Due to extensive variety of nuclear applications, the cost efficient adsorbent is extremely needed for radioactive liquid waste solutions treatment. Bentonite which is consists essentially of clay minerals of the smectite group; have a wide range of industrial uses. In this study, a simple approach to adsorb uranium (VI) from aqueous solution by exchangeable cation by sodium bentonite clay is presented. The effects of contact time, pH of the solution, initial uranium (VI) concentration, adsorbent dosage, and solution temperature on the adsorption of uranium (VI) ions from radioactive liquid solution were investigated. Adsorption isotherms were expressed by Langmuir and Freundlich adsorption models. The theoretical capacity of sodium bentonite clay adsorbent is about 12 mg/g. The optimum adsorption conditions were recommended. About 89% of the loaded Uranium (VI) on modified clay adsorbent was eluted by CH 3 COONa as an efficient eluent. The preferred adsorption and elution conditions were applied on real waste sample and the obtained capacity was determined.

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“…The low sorption at lower pH values could be attributed to H ? competition with uranium binding sites [23]. At low pH, the surface of the sorbent would be closely associated with protons (H 3 O ? )…”

Section: Effect Of Ph On Sorptionmentioning

confidence: 99%

Biosorption characteristics of uranium(VI) from aqueous solution by pummelo peel

Liu

Cao

et al. 2012

J Radioanal Nucl Chem

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The biomass pummelo peel was chosen as a biosorbent for removal of uranium(VI) from aqueous solution. The feasibility of adsorption of U(VI) by Pummelo peel was studied with batch adsorption experiments. The effects of contact time, biosorbent dosage and pH on adsorption capacity were investigated in detail. The pummelo peel exhibited the highest U(VI) sorption capacity 270.71 mg/g at an initial pH of 5.5, concentration of 50 lg/ mL, temperature 303 K and contacting time 7 h. The adsorption process of U(VI) was found to follow the pseudo-second-order kinetic equation. The adsorption isotherm study indicated that it followed both the Langmuir adsorption isotherm and the Freundlich adsorption isotherm. The thermodynamic parameters values calculated clearly indicated that the adsorption process was feasible, spontaneous and endothermic in nature. These properties show that the pummelo peel has potential application in the removal of the uranium(VI) from the radioactive waste water.

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Uranium removal from aqueous solution by coir pith: equilibrium and kinetic studies

Cited by 186 publications

References 21 publications

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

Removal of phenols from water and petroleum industry refinery effluents by activated carbon obtained from coconut coir pith

Uranium Adsorption from Aqueous Solution Using Sodium Bentonite Activated Clay

Biosorption characteristics of uranium(VI) from aqueous solution by pummelo peel

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