Synthesis and appraisal of a hydroxyapatite/pectin hybrid material for zinc removal from water

Ni, Pan; Fox, John T.

doi:10.1039/c9ra03710a

Cited by 20 publications

(5 citation statements)

References 53 publications

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“…The semi-quantitative analysis shows that the O/P and O/Ca ratios are much lower (i.e., 2.07 and 1.59, respectively) than expected from theoretical formula Ca 5 (PO 4 ) 3 (OH) (i.e., 4.33 and 2.60, respectively). The Ca/P atomic ratio is close to 1.29; much lower than theoretical 1.67 ratio; Ni and Fox [73] reported even higher Ca/P atomic ratio (close to 2.1). This probably means that the synthesis does not produce pure hydroxyapatite and that several compounds based on calcium phosphate may coexist; this is consistent with further XRD characterizations (see below).…”

Section: Morphology and Chemical Composition -Tem Sem And Sem-edx Analysismentioning

confidence: 54%

“…For uranyl species, the sorption is also slightly increased with hydroxyapatite with pH PZC close to 7.5 while the pH IEP was below 4. Ni and Fox [73] report a pH PZC ~6.0-7.0 for hydroxyapatite. The melt compounding does not change significantly the overall negative charge of the composite: the net charge in demineralized water is closed to − 15 mV, intermediary between those of n-HAp (i.e., − 12 mV) and PA6 (i.e., − 25 mV).…”

Section: Functionalization -Ftir Analysismentioning

confidence: 97%

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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: Morphology and Chemical Composition -Tem Sem And Sem-edx Analysismentioning

confidence: 54%

Section: Functionalization -Ftir Analysismentioning

confidence: 97%

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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“…SEM images were obtained using secondary electron mode. The instrument was equipped with an energy dispersive spectrometer (EDS) system, for the analysis of the X-rays emitted by the samples to determine the elemental composition during SEM observations (Ni and Fox, 2019).…”

Section: Methodsmentioning

confidence: 99%

Granulated biofuel ash as a sustainable source of plant nutrients

et al. 2020

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Recovery of nutrients from biomass combustion ash is of great importance for sustainable bioenergy waste use. In this work, granulated fertilizer materials were engineered from biofuel bottom ash, lime kiln dust and water, analysed for their chemical complexity and tested in pot experiments (2017–2018) for their propensity to release nutrients. The results obtained in this work showed that spring barley yield was observed to be the highest for granulated biomass ash with 30% of ash in the granule. The yield increased 3.99 t ha−1 per 100 kg ha−1 potassium oxide (K2O) in 2017 and 1.23 t ha−1 per 100 kg ha−1 K2O in 2018. Straw yield varied between 1.39–5.08 t ha−1/100 kg ha−1 in 2017 and 0.36–1.23 t ha−1/100 kg ha−1 in 2018. Calcium concentration significantly increased in soil. No significant changes in soil mobile phosphorus (P) were obtained as well as for the heavy metal concentrations in soil. This suggests that biofuel ash can be a significant source of certain major nutrients for crops that can also beneficially affect soil pH. The results of this work can provide policy-makers with the information needed to diversify existing and enable new biomass bottom ash utilization routes which currently vary significantly between the countries.

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“…In addition, the performance efficiency of the evaluated hybrid martials in this work, including ZnO-C and Fe 3 O 4 , was superior compared to that of most of the tabulated adsorbents from the literature. However, a few adsorbent materials exhibited a higher adsorption capacity, such as ZnO nanoparticles [68], a hydroxyapatite/pectin hybrid material [78], and a zinc oxide/graphene oxide composite (ZnO/GO) [81]. Recycling the adsorbent materials serves environmental safety and supports the costeffective wastewater treatment [82,83].…”

Section: Purification Of Wastewater Using Deviled Hybrid Adsorbent Ma...mentioning

confidence: 99%

Synthesis and Characterization of Zinc Oxide Nanoparticle Anchored Carbon as Hybrid Adsorbent Materials for Effective Heavy Metals Uptake from Wastewater

Alanazi,

Habila,

ALOthman

et al. 2024

Crystals

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Hybrid material-derived adsorbents have shown a great applicable efficiency in various fields, including industrial uses and environmental remediation. Herein, zinc oxide nanoparticle modified with carbon (ZnO-C) was fabricated and utilized for wastewater treatment through the adsorption of Zn(II), Cd(II), Co(II), and Mn(II). The surface and structural characteristics were examined using TEM, SEM, XRD, FTIR spectroscopy, EDS, and the BET surface area. Kinetics and equilibrium investigations were applied to optimize the adsorptive removal of Zn(II), Cd(II), Co(II), and Mn(II) onto ZnO-C. The results indicated that the formation of ZnO-C in crystalline sphere-like granules with a nano-size between 16 and 68 nm together with carbon matrix. In addition, the spherical granules of zinc oxide were gathered to form clusters. FTIR spectroscopy indicated that the ZnO-C surface was rich with OH groups and ZnO. The adsorption capacity 215, 213, 206, and 231 mg/g for Zn(II), Cd(II), Co(II), and Mn(II), respectively, at the optimal conditions pH between 5 and 6, a contact time of 180 min, and an adsorbent dose of 0.1 g/L. The adsorptive removal data modeling for the uptake of Zn(II), Cd(II), Co(II), and Mn(II) onto ZnO-C showed agreement with the assumption of the pseudo-second-order kinetic model and the Freundlich isotherm, suggesting a fast adsorption rate and a multilayered mechanism. The achieved adsorption capacity using the prepared ZnO-C was more effective compared to ZnO, carbon, Fe3O4, and Fe3O4-C. Real wastewater samples were applied, including valley water, industrial wastewater, and rain wastewater, and evaluated for the applicable uptake of Zn(II), Cd(II), Co(II), and Mn(II) using ZnO-C and Fe3O4-C with effective removal efficiency.

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Synthesis and appraisal of a hydroxyapatite/pectin hybrid material for zinc removal from water

Abstract: This work investigated a simple method to modify hydroxyapatite and pectin to form an efficient zinc sorbent.

Cited by 20 publications

References 53 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

Granulated biofuel ash as a sustainable source of plant nutrients

Synthesis and Characterization of Zinc Oxide Nanoparticle Anchored Carbon as Hybrid Adsorbent Materials for Effective Heavy Metals Uptake from Wastewater

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