Structure of PVA/gelatin hydrogel beads and adsorption mechanism for advanced Pb(II) removal

Hui, Bing; Zhang, Yi; Ye, Lin

doi:10.1016/j.jiec.2014.04.025

Cited by 82 publications

(29 citation statements)

References 29 publications

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“…Alginate is nontoxic, non-immunogenic, and biodegradable and when connected with multivalent metals, e.g., calcium, forms structures of large specific areas (Bartkowiak and Hunkeler 1999; Hill and Khan 2008). The sorption properties of natural polysaccharide in the form of hydrogel capsules, for instance, calcium alginate have been confirmed, among others in the research concerning the purification of water from radionuclides (Mimura et al 2001) and heavy metals (Nayak and Lahiri 2006; Hui et al 2015). …”

Section: Introductionmentioning

confidence: 80%

Removal of Phosphate from Aqueous Solution Using Alginate/Iron (III) Chloride Capsules: a Laboratory Study

Siwek

Bartkowiak

Włodarczyk

et al. 2016

Water Air Soil Pollut

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Binding phosphate at participation of alginate/FeCl3 capsules was studied with laboratory experiments. The hydrogel microcapsules were obtained with the dropping-in method, by gelation of sodium alginate water solution by iron (III) chloride solution. Phosphate adsorption characteristics were studied in a static batch system with respect to changes in contact time, initial phosphates concentration, pH of solution, and temperature. After 24 h of the tests, average 87.5% of phosphate ions were removed from the natural water solutions; after 48 h, an equilibrium was reached. The adsorption data were well fit by the Freundlich isotherm model. Parameter k of the isotherms amounted from 43.4 to 104.7, whereas parameter n amounted from 0.362 to 0.476. The course of processes of phosphate adsorption and iron desorption to aquatic phase, as well as changes in pH, suggests that phosphate adsorption is a major mechanism of phosphate removal, whereas simultaneously, but at a much lower degree, a process of precipitation of phosphate by iron (III) ions released from the capsules to the solution takes its place. Parameters calculated in the Freundlich isotherm equation show that by using several times smaller amounts of iron, it is possible to remove similar or bigger amounts of phosphorus than with other adsorbents containing iron. The alginate/FeCl3 adsorbent removes phosphate in a wide pH spectrum—from 4 to 10. Results suggest that the proposed adsorbent has potential in remediation of contaminated waters by phosphate.

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Section: Introductionmentioning

confidence: 80%

Removal of Phosphate from Aqueous Solution Using Alginate/Iron (III) Chloride Capsules: a Laboratory Study

Siwek

Bartkowiak

Włodarczyk

et al. 2016

Water Air Soil Pollut

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“…Among these technologies, the adsorption process is attractive because of its low cost and high efficiency. Widely used adsorbents include carbonaceous materials, clays, zeolites, composite materials, biomass, nanomaterials, and polymeric materials [ 6 , 7 , 8 ]. The efficiency of adsorbents depends on their specific surface areas and their chemical stabilities [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cu(II) and Zn(II) Ions from Aqueous Solution by Gel/PVA-Modified Super-Paramagnetic Iron Oxide Nanoparticles

Anudari

Yin

et al. 2018

Molecules

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Super-paramagnetic iron oxide nanoparticles (SPIONs)/gelatin (gel)/polyvinyl alcohol (PVA) nanoparticles were designed and synthesized by the co-precipitation method and further modified with gel and PVA. These nanoparticles were used for the removal of Cu(II) and Zn(II) from aqueous solutions. The adsorbents were rich in different functional groups for chemisorption and showed effective adsorption properties. The adsorption of Cu(II) and Zn(II) on the SPIONs/gel and SPIONs/gel/PVA materials were investigated with respect to pH, adsorption kinetics, and adsorption isotherms. The adsorption data was fitted to the Langmuir, Freundlich, and Sips models at the optimum pH 5.2 (±0.2) over 60 min; SPIONs/gel showed maximum adsorption capacities of 47.594 mg/g and 40.559 mg/g for Cu(II) and Zn(II); SPIONs/gel/PVA showed those of 56.051 mg/g and 40.865 mg/g, respectively. The experimental data fitted the pseudo-second-order model, indicating that the process followed chemical monolayer adsorption. In addition, the SPIONs/gel/PVA showed better stability and Cu(II) adsorption efficiency than SPIONs/gel.

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“…Nevertheless, PVA is soluble in water. This property could be disadvantageous for some 10 applications; however, PVA has been widely used in applications such as articular cartilage and pancreas regeneration (Baker et al (2011);Paradossi (2013)), drug-eluting contact lenses (Carreira et al (2014)), sensors for biological variables (Tou et al (2014); Carmona et al (2015)) and even for capturing organic dyes and metallic ions (Li et al (2014); Hui et al (2015)). 15 Natural hydrogels such as collagen, gelatin, alginate, agarose and chitosan (CS) are very attractive and are commonly used for biological applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of natural and synthetic crosslinking reagents on the structural and mechanical properties of chitosan-based hybrid hydrogels

Garnica-Palafox

Sánchez-Arévalo

2016

Carbohydrate Polymers

102

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Structure of PVA/gelatin hydrogel beads and adsorption mechanism for advanced Pb(II) removal

Cited by 82 publications

References 29 publications

Removal of Phosphate from Aqueous Solution Using Alginate/Iron (III) Chloride Capsules: a Laboratory Study

Removal of Phosphate from Aqueous Solution Using Alginate/Iron (III) Chloride Capsules: a Laboratory Study

Adsorption of Cu(II) and Zn(II) Ions from Aqueous Solution by Gel/PVA-Modified Super-Paramagnetic Iron Oxide Nanoparticles

Influence of natural and synthetic crosslinking reagents on the structural and mechanical properties of chitosan-based hybrid hydrogels

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