Study on biosorption kinetics and thermodynamics of uranium by Citrobacter freudii

Xie, Shuguang; Yang, Ji; Chen, Chao; Zhang, Xiaojian; Wang, Qingliang; Zhang, Chun

doi:10.1016/j.jenvrad.2007.07.003

Cited by 165 publications

(44 citation statements)

References 16 publications

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“…The mechanism of biosorption could include physico-chemical adsorption, ion-exchange, coordination, and micro-precipitation. Previous investigations have reported on the application of various nonliving biomass such as rice husk [7], wheat straw [8,9], tea leaves [10], peat [11], fungi [12], yeast [13], bacteria [14] and actinomycetes [15] in uranium-binding.…”

Section: Introductionmentioning

confidence: 99%

Batch study of uranium biosorption by Elodea canadensis biomass

Yao

Zhu

et al. 2016

J Radioanal Nucl Chem

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The adsorption of U(VI) onto Elodea canadensis was studied via a batch equilibrium method. Kinetic investigation indicated that the U(VI) adsorption by E. canadensis reached an equilibrium in 120 min and followed pseudo-second-order kinetics. The solution pH was the most important parameter controlling adsorption of U(VI) and the optimum pH for U(VI) removal is 6.0. The U(VI) biosorption can be well described by Langmuir model. IR spectrum analysis revealed that -NH 2 , -OH, C=O and C-O could bind strongly with U(VI). XPS spectrum analysis implied that ion exchange and coordination mechanism could be involved in the U(VI) biosorption process.

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Section: Introductionmentioning

confidence: 99%

Batch study of uranium biosorption by Elodea canadensis biomass

Yao

Zhu

et al. 2016

J Radioanal Nucl Chem

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“…Inevitably, uranyl can escape into the environment in the processes including uranium ore mining, uranium purification and transformation [1,2]. The uranyl ion is linear and has great potential to complex organic ligands, resulting in water solubility resultants [3,4]. These products easily gets into human ecosystem owning to unique mobility, causing irreversible damage by radioactive and chemical toxicity [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption of HCC-Fe 3 O 4 toward uranium(VI) as functions of contact time, pH, temperature and initial uranium(VI) concentration were investigated. The adsorption kinetics and the possible uranium(VI) removal mechanism (Scheme 1) of HCC-Fe 3 In the atmosphere of argon, acetic solution (80 mL, 5 %) were added into a three-neck rounded bottom flask, followed by addition of FeCl 2 Á4H 2 O (0.0497 g) and FeCl 3 Á6H 2 O (0.2027 g), the mixture was stirred for 10 min, to which 1.5 g chitosan and ammonia solution (80 mL, 5 %) were added. The mixed solution was stirred vigorously for 30 min, transferred into a 100 mL Teflon-lined stainless steel autoclave, heated at 180°C for 12 h, cooled to room temperature, and washed three times with deionized water.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of uranium(VI) from aqueous solution using a novel magnetic hydrothermal cross-linking chitosan

Dai

Cao

et al. 2016

J Radioanal Nucl Chem

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The magnetic hydrothermal cross-linking chitosan (HCC-Fe 3 O 4 ) was prepared by hydrothermal carbonization and was characterized by FT-IR, X-ray diffraction and scanning electron microscopy. The as-prepared HCC-Fe 3 O 4 was used as adsorbent to remove uranium(VI) as functions of contact time, pH, temperature and initial uranium(VI) concentration batch wise. The results indicated that the magnetic HCC-Fe 3 O 4 was favorate for solid-liquid separation and the maximum uranium(VI) adsorption capacity was 263.1 mg/g at pH 7.0 and 25°C. The adsorption isotherm of uranium(VI) was well fitted by the Langmuir model. The adsorption is a chemical reaction in nature proved by the well described with pseudo-secondorder model. The obtained thermodynamics parameters of positive DH, positive DS, and negative DG denoted the adsorption was an endothermic, disorder increasement, and spontaneous process. These results demonstrated that HCC-Fe 3 O 4 was a promising adsorbent for the enrichment of uranium(VI) from aqueous solutions.

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“…Uranium released into the environment through various activities can reach the food chain and be ingested by human. Major uranium toxic effects are caused by its chemical toxicity and can accumulate in different body parts, resulting in blood and kidney problem and increase risk of bone and liver cancer H. N. Bhatti (&) Á S. Hamid Environmental Chemistry Laboratory, Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad, Pakistan e-mail: hnbhatti2005@yahoo.com (Xie et al 2008). The United States Environment Protection Agency (US-EPA) has set the maximum acceptable level of 30 lg/L and World Health Organization (WHO) strictly recommended a 2 lg/L as the maximum contaminant level (MCL) for uranium (Saifuddin and Dinara 2012).…”

Section: Introductionmentioning

confidence: 99%

Removal of uranium(VI) from aqueous solutions using Eucalyptus citriodora distillation sludge

Bhatti

Hamid

2013

Int. J. Environ. Sci. Technol.

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Adsorption and desorption of uranium(VI) from dilute aqueous solutions by Eucalyptus citriodora distillation sludge was studied in a batch mode. The potential of Eucalyptus citriodora distillation sludge to remove uranium(VI) from aqueous solutions has been investigated at different conditions of solution pH, metal ion concentrations, biosorbent dosage, biosorbent particle size, contact time and temperature. The results indicated that biosorption capacity of Eucalyptus citriodora distillation sludge was strongly affected by the medium pH, the biosorbent dose, metal ion concentrations and medium temperature. Reduction in particle size increased the biosorption capacity. Langmuir and Freundlich isotherm models were applied to biosorption data to determine the biosorption characteristics. An optimum biosorption capacity (57.75 mg/g) was achieved with pH 4.0, particle size 0.255 mm, biosorbent dose 0.5 g/100 mL and initial uranium(VI) concentration of 100 mg/L. Uranium(VI) removal by Eucalyptus citriodora distillation sludge was rapid, the equilibrium was established within 60 min and pseudo-second-order model was found to fit with the experimental data. The biosorption process decreased with an increase in the temperature indicating its exothermic nature. Pretreatments of biomass with different reagents affected its biosorption capacity. A significant increase (34 %) in biosorption capacity (83.25 mg/g) was observed with benzene treatment. Fourier-transform infra-red studies showed the involvement of carbonyl, carboxyl and amide groups in the biosorption process. The results indicated that sulfuric acid had the best effects as an eluent showing 93.24 % desorption capacity.

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Study on biosorption kinetics and thermodynamics of uranium by Citrobacter freudii

Cited by 165 publications

References 16 publications

Batch study of uranium biosorption by Elodea canadensis biomass

Batch study of uranium biosorption by Elodea canadensis biomass

Adsorption of uranium(VI) from aqueous solution using a novel magnetic hydrothermal cross-linking chitosan

Removal of uranium(VI) from aqueous solutions using Eucalyptus citriodora distillation sludge

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