Polyvinyl Alcohol-Alginate Adsorbent Beads for Chromium (VI) Removal

Chuan, Lee Te; Manap, Norpadzlihatun; Abdullah, Hasan Zuhudi; Idris, Maizlinda Izwana

doi:10.14419/ijet.v7i3.20.18988

Cited by 5 publications

(2 citation statements)

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“…This is clearly shown in Figures 11 and 12. Polyvinyl alcohol (PVA) showed mechanical and chemical stability over other polymers and also possessed excellent adsorption capacity for the removal of toxic pollutants [50,65]. Ascorbic acid-coated Fe3O4 nanoparticles 16.56 mg/g pH = 7, 300 K, 60 mg/L adsorbent [60] Starch and Carboxymethyl cellulose (CMC) zerovalent iron 14 mg/g Adsorbent = 100-1000 mg/L, As = 2 mg/L, pH= 7 [61] Zero valent iron reduced graphene 29.04 mg/g 10 mg adsorbent, As(V) = 1-15 ppm, pH = 7.0 [62] Montmorillonite-supported nanoscale zero-valent iron 45.5 mg/g As = 5-250 mg/L, Adsorbent = 1 g/L, pH = 7 [63] Chitosan nanocompositesmagnetic nanoparticles 35.7 mg/g Adsorbent = 1 g/L, pH = 6.8 [24] Plant-synthesized IONPs chitosan hybrid 147 ± 7 mg/g As(V) = 300-8000 µg/L, Adsorbent = 25 g/L [64]…”

Section: Reuse Of Adsorbent and Iron Ion Releasementioning

confidence: 99%

“…This is clearly shown in Figures 11 and 12. Polyvinyl alcohol (PVA) showed mechanical and chemical stability over other polymers and also possessed excellent adsorption capacity for the removal of toxic pollutants [50,65]. The dissolution of ions from metal oxide nanoparticles was considered an important factor, especially when accounting for nanoparticle toxicity.…”

Section: Reuse Of Adsorbent and Iron Ion Releasementioning

confidence: 99%

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Polymeric Nanocomposites of Iron–Oxide Nanoparticles (IONPs) Synthesized Using Terminalia chebula Leaf Extract for Enhanced Adsorption of Arsenic(V) from Water

Saif

Tahir

Asim

et al. 2019

Colloids and Interfaces

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This study demonstrates the ecofriendly synthesis of iron-oxide nanoparticles (IONPs) and their stabilization with polymers, i.e., chitosan (C) and polyvinyl alcohol (PVA)-alginate (PA), along with a further investigation for the removal of arsenic(As(V)) from water. IONPs with an average diameter of less than 100 nm were prepared via a green synthesis process using an aqueous leaf extract of Terminalia chebula. Batch experiments were conducted to compare the removal efficiency of As(V) by these adsorbents. Factors such as pH and adsorbent dosages significantly affected the removal of arsenate As(V) by IONPs and polymer-supported reactive IONPs. Several adsorption kinetic models, such as pseudo first-order, and pseudo second-order Langmuir and Freundlich isotherms, were used to describe the adsorption of As(V). The removal of As(V) by IONPs follows the Langmuir adsorption isotherm. The highest monolayer saturation adsorption capacity as obtained from the Langmuir adsorption isotherm for IONPs was 28.57 mg/g. As(V) adsorption by polymer-supported IONPs best fit the Freundlich model, and maximum adsorption capacities of 34.4 mg/g and 40.3 mg/g were achieved for chitosan-and PVA-alginate-supported IONPs, respectively. However, among these absorbents, PVA-alginate-supported IONPs were found to be more effective than the other adsorbents in terms of adsorption, stability, and reusability.Among the various water treatment technologies, adsorption seems to be a more convenient and effective method for the removal of heavy metals in terms of cost and simplicity of process [10]. Iron and related adsorbents are popular for the remediation of water pollutants [11]. The intervention of nanotechnology opened a new horizon in the field of water purification [12]. Iron nanoparticles (NPs), which possess a high surface area and surface reactivity, are effectively used for water treatment [13,14]. Zero-valent iron nanoparticles (nZVIs) and iron oxide nanoparticles, such as Fe 2 O 3 and Fe 3 O 4 NPs, are among those commonly employed for the remediation of environmental pollution, particularly for the decontamination of water [15][16][17][18]. Magnetic nanoparticles and modified magnetic nanoparticles were found to be very effective for the removal of arsenic because of their strong adsorption activities, and they can be easily separated by employing an external magnetic field [19][20][21]. Evidence of the particle size influence on the ability to remove (adsorb) arsenic from water was observed, as smaller nanoparticles were found to exhibit more adsorption capacity and faster kinetics due to their higher specific surface area, shorter intraparticle diffusion distance, and larger number of surface reaction sites of nanoparticles [22,23]. The nanopowder form of metal oxides/hydroxides provides a high surface area for increased adsorption capacity; however, this small particle size also drives the need for energy-intensive post-treatment filtration to recover the nanoparticles for regeneration and reuse [24]. To overcome this issue,...

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Section: Reuse Of Adsorbent and Iron Ion Releasementioning

confidence: 99%

“…This is clearly shown in Figures 11 and 12. Polyvinyl alcohol (PVA) showed mechanical and chemical stability over other polymers and also possessed excellent adsorption capacity for the removal of toxic pollutants [50,65]. The dissolution of ions from metal oxide nanoparticles was considered an important factor, especially when accounting for nanoparticle toxicity.…”

Section: Reuse Of Adsorbent and Iron Ion Releasementioning

confidence: 99%