Effect of adsorbents and chemical treatments on the removal of strontium from aqueous solutions

Ahmadpour, Ali; Zabihi, Mohammad; Tahmasbi, M.; Bastami, Tahereh Rohani

doi:10.1016/j.jhazmat.2010.06.067

Cited by 117 publications

(45 citation statements)

References 27 publications

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“…In a third set of experiments, the effect of metal ion concentration on the adsorption behavior of allophanes was investigated at pH 8.5 ± 0.1 for 2 h using 0.1 g of the adsorbent and 50 mL of solution containing Ba, Co, Sr and Zn in different concentrations (1,10,20,50 and 100 mg/L). The suspensions were prepared in analogy to those from the second set of experiments.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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Abstract:The capacity and the mechanism of the adsorption of aqueous barium (Ba), cobalt (Co), strontium (Sr) and zinc (Zn) by Ecuadorian (NatAllo) and synthetic (SynAllo-1 and SynAllo-2) allophanes were studied as a function of contact time, pH and metal ion concentration using kinetic and equilibrium experiments. The mineralogy, nano-structure and chemical composition of the allophanes were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and specific surface area analyses. The evolution of adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium between aqueous metal ions and allophane was reached within < 10 min. The metal ion removal efficiencies varied from 0.7 to 99.7 % at pH 4.0 to 8.5. At equilibrium, the adsorption behavior is better described by the Langmuir model than by the Dubinin-Radushkevich model, yielding sorption capacities of 10.6, 17.2 and 38.6 mg/g for Ba , 12.4, 19.3 and 29.0 mg/g for HCoO , 7.2, 15.9 and 34.4 mg/g for Sr and 20.9, 26.9 and 36.9 mg/g for Zn , respectively, by NatAllo, SynAllo-2 and SynAllo-1. The uptake mechanism is based on a physical adsorption process. Allophane holds great potential to remove aqueous metal ions and could be used instead of zeolites, montmorillonite, carbonates and phosphates for wastewater treatment.

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Section: Adsorption Experimentsmentioning

confidence: 99%

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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show abstract

“…The decrease in adsorption at high pH values may be due to the competitiveness of the oxyanion of chromium and OH -ions in the bulk. These results suggest that pH affects the solubility of metals and the ionization state of the functional groups like carboxylate, phosphate and amino groups of the cell walls of the biosorbent [34][35][36][37]. …”

Section: Batch Biosorption Experiments 321 Effect Of Ph On Cr (Vi) mentioning

confidence: 89%

Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel

Mandina¹

2013

IOSR-JAC

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of Cr (VI) ions increased with increase in contact time and remained constant after an equilibrium time of 180 min. The removal of Cr (VI) ions increased with increase in biosorbent concentration with the optimal adsorbent dosage at 4.0 mg/L. The increase in initial Cr (VI) ion concentration led to an increase in the percentage removal of Cr (VI). The adsorption data fitted well with the Freundlich isotherm model with

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“…Maybe it is because adsorption sites reach saturation. In general, the adsorption capacity of Sr 2+ increases with the increase of initial concentration [21,22]. However, compared to the selected concentration range in this paper, the concentration ranges they choose are narrow.…”

Section: Effect Of Initial Concentrationmentioning

confidence: 91%

Facile Synthesis of Fe3O4-N-[(3-Trimethoxysilyl)propyl]ethylenediamine Triacetic-acid Trisodium Salt and Adsorption of Sr 2+

Hu¹,

Quan²

2016

JRST

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Effect of adsorbents and chemical treatments on the removal of strontium from aqueous solutions

Cited by 117 publications

References 27 publications

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel

Facile Synthesis of Fe3O4-N-[(3-Trimethoxysilyl)propyl]ethylenediamine Triacetic-acid Trisodium Salt and Adsorption of Sr 2+

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