Enhanced sorption capacities for lead and uranium using titanium phosphates; sorption, kinetics, equilibrium studies and mechanism implication

Kapnisti, Maria; Noli, F.; Μisaelides, P.; Vourlias, G.; Karfaridis, Dimitrios; Hatzidimitriou, A.

doi:10.1016/j.cej.2018.02.066

Cited by 85 publications

(27 citation statements)

References 41 publications

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“…The obtained value of k 2 (0.0015 g•mg −1 •min −1 ) for lead was much greater than that obtained by Kapnisti et al [23] for titanium phosphate with Ti 2 O 3 (H 2 PO 4 ) 2 composition (0.000227g•mg −1 •min −1 ). This difference may be due to a lower initial lead concentration in The solution, as well as better pore characteristics of The synthesized sorbent (0.05 cm 3 /g for Ti 2 O 3 (H 2 PO 4 ) 2 and 0.26 cm 3 /g for The studied sorbent).…”

Section: Discussioncontrasting

confidence: 67%

“…A literature review shows that The mass transfer stages, especially external diffusion, are not considered thoroughly when The kinetic properties of titanium phosphates are studied. The authors' attention is usually focused on The study of The fourth stage (sorption) using pseudo-first-or pseudo-second-order reactions models [13,22,23]. At The same time, diffusion can also have a significant effect on The overall rate of The sorption process.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of The Sorption Kinetics of Lead(II) and Zinc(II) on Titanium Phosphate Ion-Exchanger

Маслова

Иваненко

Yanicheva

et al. 2020

IJMS

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The treatment of heavy metal-contaminated wastewater is an important action to reduce The negative impacts of industrial wastes on water bodies. This work focuses on The application of a low-cost titanium (IV) phosphate sorbent of TiO(OH)H2PO42H2O chemical composition toward lead and zinc ions depending on their concentration and The temperature of The solution. The kinetic studies showed that The values of The rate of intraparticle diffusion and The effective diffusion coefficients for Zn2+ were considerably higher than those for Pb2+. To explain The difference between The sorption kinetics rates for Pb2+ and Zn2+, The effective radius and dehydration degree of The adsorbed ions were calculated. The sorbent capability of The lead and zinc ion removal and its excellent efficiency in The presence of a high concentration of calcium ions were demonstrated using simulated mine water. Due to The fast kinetics and The high exchange capacity of titanium phosphate toward divalent ions, this sorbent can be considered as a promising material for The concentration and immobilization of heavy metals into The phosphate matrix.

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Section: Discussioncontrasting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Comparison of The Sorption Kinetics of Lead(II) and Zinc(II) on Titanium Phosphate Ion-Exchanger

Маслова

Иваненко

Yanicheva

et al. 2020

IJMS

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“…We propose that the difference in performance between low and high U systems for 52 The mechanism of uptake was described as a combination of absorption and surface complexation that shifts to surface precipitation; this scenario seems consistent with the likely removal mechanism on HDPA mats. 52 For nanofibers without evidence of surface precipitation, trends in pH-dependent removal lend insight into the mechanism of U binding on the functionalized nanofiber. For example, while HDEHP performs similarly at both high and low initial U concentrations, its sorption capacity is reduced considerably above pH 3.…”

Section: Kinetic Uptakesupporting

confidence: 62%

“…Meanwhile capacities (up to 1250 and 2330 mg per g of sorbent material). 52,53 Comparatively, Aq is expected to undergo anion exchange with the negatively charged uranyl in solution. For example, strong base anion exchangers (similar to Aq) have been used to extract uranium from sulfate, hydrochloric, nitric, and carbonate media.…”

Section: Research Motivation and Objectivesmentioning

confidence: 99%

Development of electrospun polymer nanofiber mats for removal of uranium from aqueous systems

Johns¹

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Uranium contamination in drinking water sources, such as ground or surface water, poses a potential health risk. In areas, such as the Navajo Nation, uranium levels can be found at concentrations ~300 times higher than the maximum concentration limit (MCL) set by the Environmental Protection Agency (EPA) of 30 µg/L. Exposure to these contaminated waters can result in elevated uranium concentrations within the body even after several months of eliminating the source. Inside the body uranium is a nephrotoxin (damages the kidney) and has been linked to cancer among other health problems. Reducing these health risks towards individuals requires methods for cleaning uranium from aqueous systems and sensing it within water and body fluids for biomonitoring. The objective of this work was to synthesize, characterize, and test electrospun polymer nanofiber mats capable of extracting uranium from water with applications in sensing and/or point of use (POU) treatments devices. Materials were synthesized with a suite of functional groups capable of extracting uranium from aqueous systems such as amidoxime, phosphonic acids, and quaternary ammonium salts (QAS) then characterized to evaluate materials physical and chemical traits. Batch uptake studies evaluated materials uptake rates, efficiency at varying pH's, and ability to remove uranium over a range of initial concentrations. Flow through studies assessed materials abilities to be used as a POU treatment technology for removing uranium from drinking water.

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“…Compared with figure 4 c and figure 4 d , the adsorption of U(VI) by BM-SA was more consistent with the pseudo-second-order kinetic model. The R 2 of pseudo-second-order kinetics was 0.99, which was higher than that of pseudo-first-order kinetics (0.85) ( table 1 ) [ 32 ]. Under certain conditions, q e was a constant, and q t increased gradually with time and approached q e .…”

Section: Resultsmentioning

confidence: 99%

U(VI) adsorption in water by sodium alginate modified Bacillus megaterium

Yang

Zhang

et al. 2021

R. Soc. open sci.

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The surface of Bacillus megaterium was modified by coating sodium alginate. The modified B. megaterium before and after adsorption were characterized by SEM, FTIR and XPS. The effects of pH, reaction time, initial U(VI) concentration and adsorbent dosage on the adsorption of U(VI) by the modified B. megaterium were studied by batch adsorption experiments. The adsorption process was studied by pseudo-first-order kinetics and pseudo-second-order kinetic models, Langmuir and Freundlich isotherms. The results showed that the maximum adsorption capacity of U(VI) was 74.61 mg g −1 under the conditions of pH 5.0, adsorbent 0.2 g l −1 , 30°C and initial U(VI) concentration of 15 mg l −1 . The adsorption process accords with pseudo-first-order kinetics and Langmuir isotherm. The adsorption capacity of U(VI) by the modified B. megaterium was still higher than 80% after five times of desorption and reuse experiments. In conclusion, the sodium alginate modified B. megaterium was an ideal material for U(VI) biosorption.

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Enhanced sorption capacities for lead and uranium using titanium phosphates; sorption, kinetics, equilibrium studies and mechanism implication

Cited by 85 publications

References 41 publications

Comparison of The Sorption Kinetics of Lead(II) and Zinc(II) on Titanium Phosphate Ion-Exchanger

Comparison of The Sorption Kinetics of Lead(II) and Zinc(II) on Titanium Phosphate Ion-Exchanger

Development of electrospun polymer nanofiber mats for removal of uranium from aqueous systems

U(VI) adsorption in water by sodium alginate modified Bacillus megaterium

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