Adsorption of U(VI) from sulfate solution using montmorillonite/polyamide and nano-titanium oxide/polyamide nanocomposites

Cheira, Mohamed F.; Kouraim, Mohamed N.; Zidan, Ibrahim H.; Mohamed, Wael S.; Hassanein, Taha F.

doi:10.1016/j.jece.2020.104427

Cited by 69 publications

(17 citation statements)

References 52 publications

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“…Xia et al characterized the effect of experimental procedures on the average pore size of different n-HAp materials from 6 to 69 nm; the present material shows an intermediary value for pore size (i.e., 36.4 nm). Similar trends were recorded for PA6/montmorillonite materials [42]. The pore volume of n-HAp being close to 0.33 cm 3 g − 1 is much lower than the value reported by Xia et al for their specific productions (~1.31 cm 3 g − 1 ) but in the middle range of commercial n-HAp substrates (0.15− 0.96 cm 3 g − 1 ) [72].…”

Section: Textural Properties -Bet Analysissupporting

confidence: 85%

“…However, the sorption capacities were usually low (in the range 0.5− 0.62 mmol g − 1 for Er(III), Tb(III) and Dy(III)) with optimum sorption close to pH 5, or about 0.08 mmol U g − 1 at pH 7 [39]. These materials have been also frequently designed as composite by incorporation of silica [40], clays [41,42], carbon [43] or biomass [44] to (a) improve specific surface area, (b) change hydrophilic/hydrophobic characteristics and (c) enhance sorption performance. The functionalization of polyamide-based materials has been also used for improving metal sorption [45][46][47][48].…”

Section: Characterization Of Materialsmentioning

confidence: 99%

“…In the case of REEs and PA6, the PFORE allows getting higher values for both R 2 and AIC while for PA6/n-HAp the PSORE is more efficient for Nd(III); for Er (III), both the PSORE and the RIDE give good fits. Cheira et al concluded that U(VI) sorption onto PA6 and PA6/montmorillonite is preferentially described by the PSORE [42]. Comparing experimental values of the sorption capacity at equilibrium (q eq ) with calculated values (q eq,1 or pH augmentation, until reaching pH eq ~ 3 for the same reason (decrease in repulsion effects); however, at higher pH the formation of large size polynuclear hydrolyzed species limits the accessibility to internal reactive groups for uranyl species.…”

Section: Uptake Kinetics -Mass Transfer Limitationsmentioning

confidence: 99%

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Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Hassanein

Masoud

Mohamed

et al. 2021

Journal of Environmental Chemical Engineering

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Polyamide (PA6) and hydroxyapatite (n-HAp) have intrinsic sorption properties for metal ions. Their association by melt compounding allows manufacturing a composite material (PA6/n-HAp) efficient for the binding of uranyl and rare earth metal ions (REEs) in acidic solution (in the pH range 2-2.5). The composite shows enhanced sorption capacities (5-7 times) compared with single PA6 material. The structuration of the material slightly improves textural properties but contributes to improve the accessibility and availability of reactive groups (including by size distribution). Metal sorption proceeds mainly through complexation of amide reactive groups as shown by FTIR characterization (modification of the environment of C --O and NH groups) rather than ionexchange/electrostatic attraction. Maximum sorption capacities approach 0.34 mmol U g − 1 , 0.49 mmol Er g − 1 and 0.70 mmol Nd g − 1 : the preference may be correlated to the covalent rather than ionic character of these metal ions. Uptake kinetics are relatively slow (requiring up to 6− 8 h, under selected experimental conditions): the textural properties of the composite (pore size: 2.6 nm) limit the mass transfer properties (though slightly enhanced compared with PA6 precursor). The resistance to intraparticle diffusion constitutes the major con-trolling step for uptake kinetics. Nitric acid is the most efficient eluent for the desorption of loaded metals (ef-ficiency exceeds 94 %); noticeably U(VI) elution is optimal at 1 M HNO 3 concentration, contrary to REEs that require lower concentration (i.e., 0.1 M). Preliminary tests on sulfuric acid leachates of Egyptian ores demon-strate that the sorbent maintains good sorption properties for REEs and U despite the complexity of the solution. The sorbent has a marked preference for REEs, U and Th against base and alkali metals.

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Section: Textural Properties -Bet Analysissupporting

confidence: 85%

Section: Characterization Of Materialsmentioning

confidence: 99%

Section: Uptake Kinetics -Mass Transfer Limitationsmentioning

confidence: 99%

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Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Hassanein

Masoud

Mohamed

et al. 2021

Journal of Environmental Chemical Engineering

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“…Besides, there was an aggregation in the NPs, which was probably induced by the presence of starch [63,64]. It is found in our study that the average particle size measured by TEM (23 nm) is lower than the one reported by DLS (68.43 nm).…”

Section: Tem Analysiscontrasting

confidence: 60%

Optimized Synthesis of Biopolymer-Based Zinc Oxide Nanoparticles and Evaluation of Their Antibacterial Activity

et al. 2021

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Owing to their unique properties, zinc oxide nanoparticles (ZnO NPs) have a broad range of exciting applications. However, the problem of nanoparticles aggregation remains challenging. So, biopolymers of polysaccharides can provide green and promising stabilizers as alternatives to the current toxic chemical stabilizers during ZnO NPs synthesis. The main idea in this investigation is to tune ZnO NPs with an appropriate texture, shape, and size for antibacterial application. So, this work compares the use of three different eco-friendly stabilizers namely starch, carboxymethyl cellulose, and hydroxyethyl cellulose as alternatives capping agents in the fabrication of ZnO NPs at various times. The optimized ZnO NPs sample was obtained using starch as the optimum stabilizer at reaction conditions of 0.5 h, room temperature (25 °C), 1:2 )MZn:MNaOH) ratio and 1% (w/v) starch concentration. The optical, texture, and structural properties of prepared ZnO NPs were characterized by UV-Vis, DLS, zeta potential, FT-IR, and TEM techniques. ZnO NPs showed a mean zeta potential of −21.6 mV, explaining that they are moderately stable. The analysis by TEM confirmed that the NPs were spherical and have an average size of 23 nm. The antibacterial properties of ZnO NPs against Gram-positive (Bacillus subtilis and Staphylococcus epidermidis) and Gramnegative (Enterobacter cloacae and Escherichia coli) bacteria were evaluated based on the zone of inhibition (ZOI) values expressed in mm. The results showed promising performances for their antibacterial activity against the tested bacteria which indicated a strong antibacterial activity of ZnO NPs against B. subtilis, S. epidermidis, and E. cloacae with ZOI values of 17, 14 and 16 mm, respectively, and it showed moderate activity against E. coli (ZOI = 10 mm). The synthesis of biopolymer stabilized ZnO NPs by this approach could be eco-friendly and cost-effective and synthesized ZnO NPs can serve as promising antibacterial agents.

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“…After adsorption, the -OH, -NH, C-O, and C=N stretching peaks for CS moved to redshift by 5-10 cm -1 , which might attitude to U(VI) pickup at CS surface. Moreover, the new peaks of O=U=O were 974 and 894 cm -1 [39,40] of U/CS. Additionally, two weak peaks of U-O were near the ≈ 465 and ≈ 425 cm −1 [41].…”

Section: Thementioning

confidence: 93%

Peculiarities of u(vi) adsorption from acidic solution using chitin-derived chitosan as a low-priced bio-adsorbent

El-Rahem

Taher

Cheira

2021

Al-Azhar Bulletin of Science

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Chitosan (CS) as an inexpensive bio-adsorbent was set by chitin deacetylation using sodium hydroxide. The prepared bio-adsorbent was distinguished via Scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy dispersive spectroscopy (EDX), Brunner-Emmett-Teller surface area (BET) analyzer, and Fourier transform infrared spectroscopy (FTIR). Chitosan implemented for U(VI) adsorption, and the studied parameters that are pH, time of contact, initial concentration, and temperature, were determined by batch technique. The maximum uptake of CS adsorbent is 88.0 mg/g at 200 mg/L initial U(VI) concentration, pH 3.5, and 25 °C. The kinetic information agreed with the pseudo-second-order model, which considered the attendance of chemisorption. The equilibrium of adsorption reaction gained within 50 min, and equilibrium information well satisfaction for Langmuir model confirmed that U(VI) adsorbed at chitosan monolayer coverage area. Also, the chitosan bio-adsorbent was indeed regenerated by 1M H2SO4 and 1/50 S/L ratio for 75 min of contact. Seven rounds of adsorption-desorption investigations attended to scrutinize the working applicability and renewed application of the bio-adsorbent.

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Adsorption of U(VI) from sulfate solution using montmorillonite/polyamide and nano-titanium oxide/polyamide nanocomposites

Cited by 69 publications

References 52 publications

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Synthesis of polyamide 6/nano-hydroxyapatite hybrid (PA6/n-HAp) for the sorption of rare earth elements and uranium

Optimized Synthesis of Biopolymer-Based Zinc Oxide Nanoparticles and Evaluation of Their Antibacterial Activity

Peculiarities of u(vi) adsorption from acidic solution using chitin-derived chitosan as a low-priced bio-adsorbent

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