Hexavalent Chromium Removal and Reduction to Cr (III) by Polystyrene Tris(2-aminoethyl)amine

Odeh, Lina; Odeh, Imad; Khamis, Mustafa; Khatib, M. F. Al; Qurie, Mohannad; Shakhsher, Ziad; Qutob, Mutaz

doi:10.4236/ajac.2015.61003

Cited by 14 publications

(9 citation statements)

References 19 publications

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“…Thus the FTIR spectra of both BGWM and BGWM‐Cr confirmed that under the experimental condition, the peaks either displayed at the same wave number or shifted a certain extent from their original position. These changes in peaks confirmed Cr (VI) binding on adsorbent surface and also in agreement with the findings of other studies .…”

Section: Resultssupporting

confidence: 92%

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Narayan

Meena

Patel

et al. 2015

Env Prog and Sustain Energy

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This study was performed to investigate the latent potential of biomass gasifier waste material (BGWM) as an adsorbent for removal of Cr (VI) from aqueous solution. The present work also proposes an alternate use of gasifier refuge BGWM with great economic feasibility. The effects of initial pH, BGWM concentration, Cr(VI) concentration, temperature and contact time were investigated on the removal of Cr (VI) from aqueous solution. The maximum removal of Cr (VI) was found to be 99.67% at optimum condition of initial pH 2, contact time 80 min, initial Cr (VI) concentration 10 mg L−1, adsorbent dose 5 g L−1, agitation speed 120 rpm, and temperature 35°C. The adsorbent was characterised by SEM, EDX, XRD, BET and FTIR analysis to get important information about its effective application for Cr (VI) removal. The BET surface area of 165.287 m2 g−1 for BGWM was found comparable to that of commercial silica. Batch adsorption experiments showed that pseudo‐second‐order kinetics model and Langmuir isotherm model fitted the adsorption data very well. Thermodynamic parameters revealed the feasibility, spontaneity and endothermic nature of Cr (VI) adsorption onto BGWM. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 95–102, 2016

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Section: Resultssupporting

confidence: 92%

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Narayan

Meena

Patel

et al. 2015

Env Prog and Sustain Energy

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“…In general, anion adsorption is strongly dependent on the pH of the medium, exhibiting the greatest removal in acidic to neutral solution. As has been demonstrated in previous studies, optimal Cr (VI) adsorption occurs at a pH lower than 4 for various sorbents, such as some metallic (oxy)hydroxides [32][33][34] and natural bio-sorbents, for example, larch bark [35], cooked tea dust [36], papaya seeds [37], raw Bagasse [38], and activated carbon [39]. In the case where iron and aluminum oxides are used as adsorbents, an adsorption efficiency of higher than 80% was reached at a pH of 4 to 6.…”

Section: Effect Of Ph On Chromium Adsorptionmentioning

confidence: 95%

Adsorption of Chromium (VI) on Calcium Phosphate: Mechanisms and Stability Constants of Surface Complexes

El-Yahyaoui¹,

Ellouzi²,

Zabadi

et al. 2017

Applied Sciences

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Abstract:The adsorption of chromate on octacalcium phosphate (OCP) was investigated as a function of contact time, surface coverage, and solution pH. The ion exchange method was adapted to establish the interaction mechanism. Stoichiometry exchange of H + /OH − was evaluated at a pH range of 3-10, and obtained values ranged between 0.0 and 1.0. The surface complexes formed between chromate and OCP were found to be > S(HCrO 4 ) and > S(CrO 4 ). The logarithmic stability constant logK 1-1 , and the logK 10 values of the complexes, were 6.0 in acidic medium and 0.1 in alkaline medium, respectively. At low pH and low surface coverage, the bidentate species > S(HCrO 4 ) 2 with logK 10.5 of about 2.9, was favored at a hydration time of less than 150 min. The contribution of an electrostatic effect to the chromium uptake by the OCP sorbent, was also evaluated. The results indicate that the adsorption of chromate on OCP is of an electrostatic nature at a pH ≤ 5.6, and of a chemical nature at a pH > 5.6.

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“…3310, 3115-3020, 2928-2840 and 1509-1511 cm −1 are characteristic of ν(OH), ν(CH) arom , ν(CH) aliph , and ν(C-C) arom . ring, respectively [39,40]. An imine band was observed ca.…”

Section: Characterization Of (Aeps-salbr) Nss and (Aeps-salbr-pd) Nssmentioning

confidence: 99%

New Nanospheres to Use in the Determination of Imidan Phosmet and Vantex Pesticides

Karmaz

Özkan

Yetim

et al. 2021

J Inorg Organomet Polym

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In this study, the usability of AChE immobilized nanospheres (NSs) was investigated to identify Imidan Phosmet and Vantex pesticides. Accordingly, (2AEPS-SalBr) coded nanosphere was synthesized in result of condensation of (Tris (2 aminoethyl) amine polymer and 5-bromine-2-hydroxy benzaldehyde. Then, new nanosphere coded 2AEPS-SalBr-Pd was synthesized using the template method. The structures of the synthesized nanospheres were characterized by the FT-IR, GPC, SEM/EDX and elemental analysis. Acetylcholinesterase (AChE) enzyme was immobilized to these nanospheres for the determination of Imidan and Vantex. The optimum conditions of the immobilized-AChE enzyme, the number of reuse, storage stability, and the kinetic parameters were determined. The immobilized AChE optimum pH was 8 for both supports, and the optimum temperature was 50 °C and 70 °C, respectively. Km and Vmax values were calculated as 1.443 mM and 0.251 mM/min for (2AEPS-SalBr)-AChE (pH 8, at 50 °C), and 0.680 mM and 0.157 mM/min for (2AEPS-SalBr-Pd)-AChE (pH 8, at 70 °C). Then the analyses of Imidan Phosmet and Vantex pesticides were carried out with immobilized AChE on nanospheres. As a result of the research, it was seen that Imidan Phosmet pesticide can be determined at a lower concentration than Vantex pesticide.

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Hexavalent Chromium Removal and Reduction to Cr (III) by Polystyrene Tris(2-aminoethyl)amine

Cited by 14 publications

References 19 publications

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Adsorption of Chromium (VI) on Calcium Phosphate: Mechanisms and Stability Constants of Surface Complexes

New Nanospheres to Use in the Determination of Imidan Phosmet and Vantex Pesticides

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