Combination of maghemite and titanium oxide nanoparticles in polyvinyl alcohol-alginate encapsulated beads for cadmium ions removal

Majidnia, Zohreh; Idris, Ani

doi:10.1007/s11814-014-0333-7

Cited by 15 publications

(4 citation statements)

References 33 publications

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“…In contrast, the M s value for the FeGOTi catalyst was estimated around 25 emu g −1 which is quite far from the magnetite values, demonstrating that the synthesis procedure affects the iron-containing phase. This fact allows a much more correct assignation of the phase detected in XRD as maghemite that presents similar magnetic moment values in the bibliography [29,30].…”

Section: Catalystmentioning

confidence: 87%

Checking the Efficiency of a Magnetic Graphene Oxide–Titania Material for Catalytic and Photocatalytic Ozonation Reactions in Water

et al. 2022

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An easily recoverable photo-catalyst in solid form has been synthesized and applied in catalytic ozonation in the presence of primidone. Maghemite, graphene oxide and titania (FeGOTi) constituted the solid. Additionally, titania (TiO2) and graphene oxide–titania (GOTi) catalysts were also tested for comparative reasons. The main characteristics of FeGOTi were 144 m2/g of surface area; a 1.29 Raman D and G band intensity ratio; a 26-emu g−1 magnetic moment; maghemite, anatase and brookite main crystalline forms; and a 1.83 eV band gap so the catalyst can absorb up to the visible red region (677 nm). Single ozonation, photolysis, photolytic ozonation (PhOz), catalytic ozonation (CatOz) and photocatalytic ozonation (PhCatOz) were applied to remove primidone. In the presence of ozone, the complete removal of primidone was experienced in less than 15 min. In terms of mineralization, the best catalyst was GOTi in the PhCatOz processes (100% mineralization in 2 h). Meanwhile, the FeGOTi catalyst was the most efficient in CatOz. FeGOTi led, in all cases, to the highest formation of HO radicals and the lowest ozone demand. The reuse of the FeGOTi catalyst led to some loss of mineralization efficacy after four runs, likely due to C deposition, the small lixiviation of graphene oxide and Fe oxidation.

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Section: Catalystmentioning

confidence: 87%

Checking the Efficiency of a Magnetic Graphene Oxide–Titania Material for Catalytic and Photocatalytic Ozonation Reactions in Water

et al. 2022

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“…The reason for these findings parallel to our study might be related to a more compacted inner structure and diffusional difficulties due to increased mass transfer resistance created by the higher amount of materials captured within the alginate bead. The increased amount of nanomaterial may lead to agglomeration within composite beads and clog the pores that eventually reduce the surface area available for adsorption and diffusion of metals through the pores [20][21][22]. Thus, a bit lower amount of captured materials in beads resulted in higher heavy metal removals.…”

Section: Effect Of Adsorbent/bead Composition On Single Ion Adsorptionmentioning

confidence: 99%

Zinc oxide nanoparticles encapsulated in alginate beads: a promising and recyclable adsorbent for simultaneous uptake of toxic metals

Çevik,

Kivilcimdan Moral

2024

Nanotechnology

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Heavy metal toxicity is a known problem and various methods are used for treatment. Adsorption has some advantages and it would be promising if environmentally friendly and cheap materials were utilized. Alginate and zinc oxide nanoparticles were selected and composite alginate beads were used for the removal of mixed metals from aqueous solutions. Batch and column experiments were conducted to determine some parameters' effects and the adsorbent's real application potential. According to the batch experiments, zinc oxide nanoparticles to alginate ratio of 0.5 g/g, and pH levels nearby to the neutral range led to better metal removals. 0.5 ml/min of flow rate supplied better metal removal efficiencies in columns, with the highest treatment as 86% of Pb2+. Acid treatment can be successfully applied for the regeneration of the adsorbent, at least three times only with a 4% reduction in the adsorption efficiency. Heavy metal uptake was compatible with the Pseudo 2nd order model indicating chemisorption as a dominant mechanism. Also, the intraparticle diffusion model illustrated adsorption might govern more than one step. The Langmuir model had the best fit and suggested monolayer covering for Pb2+, 76.3 mg/g. Alginate-based nanocomposite beads were useful for mixed metal removal and could be used.

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“…6 Low water-soluble barium quantities may be the cause of various diseases including (but not limited to) breathing problems, hypertension, and cardiac rhythm changes. 2,10,11 The semi conductive photo catalyst titanium dioxide (TiO 2 ) presents highly photo catalytic behavior in degrading organic compounds having high chemical stability and low toxicity. Hence, an effective and straightforward procedure needs to be devised to remove these compounds prior to disposing of wastes in an aquatic system.…”

Section: Introductionmentioning

confidence: 99%

“…There is extensive research reporting the adsorption of barium(II) and stransium(II) ions from aqueous solutions onto a variety of inorganic and organic adsorbents. 2,10,11 The semi conductive photo catalyst titanium dioxide (TiO 2 ) presents highly photo catalytic behavior in degrading organic compounds having high chemical stability and low toxicity. Thus, TiO 2 possesses substantially larger potential application for purication of water and air [12][13][14][15] as it is able to photo degrade organic compounds under ultraviolet light conditions however its photo catalytic activity under visible light is reported to be limited.…”

Section: Introductionmentioning

confidence: 99%

Removal of barium from radioactive aqueous solution by PVA–alginate encapsulated titanium oxide using sunlight and other light types

Majidnia

Idris

2015

RSC Adv.

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Barium(II) removal with titania PVA-alginate beads was conducted with sunlight, xenon, black light bulb (BLB) and light emitting diode (LED) lamps. The removal was studied as a function of pH, contact time, temperature and initial concentration. The findings show the removal rate of barium(II) achieved a 98% maximum within 130 min under sunlight. The beads were found to be easily isolated from the aqueous solution and could be reused a minimum of 5 times without losing the original properties. Barium(II) reduction fitted best with the pseudo second-order rate model with a coefficient of determination (R 2 ) of 0.9938.

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Combination of maghemite and titanium oxide nanoparticles in polyvinyl alcohol-alginate encapsulated beads for cadmium ions removal

Cited by 15 publications

References 33 publications

Checking the Efficiency of a Magnetic Graphene Oxide–Titania Material for Catalytic and Photocatalytic Ozonation Reactions in Water

Checking the Efficiency of a Magnetic Graphene Oxide–Titania Material for Catalytic and Photocatalytic Ozonation Reactions in Water

Zinc oxide nanoparticles encapsulated in alginate beads: a promising and recyclable adsorbent for simultaneous uptake of toxic metals

Removal of barium from radioactive aqueous solution by PVA–alginate encapsulated titanium oxide using sunlight and other light types

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