Sodium cobalt hexacyanoferrate encapsulated in alginate vesicle with CNT for both cesium and strontium removal

Vipin, Adavan Kiliyankil; Sun, Ling; Fugetsu, Bunshi

doi:10.1016/j.carbpol.2014.04.037

Cited by 67 publications

(22 citation statements)

References 38 publications

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“…Nanomaterials have also shown high performance for the removal of contaminants because of their high surface area, large pore volume, high pore sizes and absence of internal diffusion resistance 38 39 . Therefore, when nanomaterials are immobilized with functional organic compounds, it creates a new powerful class of hybrid nanomaterials that can be used for the purpose of the fast and potential remediation process 39 40 41 . To improve the rate and selectivity of Cs adsorption at extremely low concentrations onto adsorbents, adsorbents with specific functional groups containing organic ligand are preferable with extreme selectivity based on the inorganic material supported hybrid adsorbent 27 .…”

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confidence: 99%

A Reliable Hybrid Adsorbent for Efficient Radioactive Cesium Accumulation from Contaminated Wastewater

Awual

Yaita

Miyazaki

et al. 2016

Sci Rep

193

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Cesium (Cs) removal from nuclear liquid wastewater has become an emerging issue for safeguarding public health after the accident at the Fukushima Daiichi Nuclear Power Plant. A novel macrocyclic ligand of o-benzo-p-xylyl-22-crown-6-ether (OBPX22C6) was developed and successfully immobilized onto mesoporous silica for the preparation of hybrid adsorbent. The benzene ring π electron is the part of crown ether of OBPX22C6 for easy orientation of the macrocyclic compound for making the π electron donation with Cs complexation. The potential and feasibility of the hybrid adsorbent as being Cs selective was evaluated in terms of sensitivity, selectivity and reusability. The results clarified that the Cs removal process was rapid and reached saturation within a short time. Considering the effect of competitive ions, sodium (Na) did not markedly affect the Cs adsorption whereas potassium (K) was slightly affected due to the similar ionic radii. However, the oxygen in long ethylene glycol chain in OBPX22C6 was expected to show strong coordination, including Cs-π interaction with Cs even in the presence of the high amount of K and Na. Due to its high selectivity and reusability, significant volume reduction is expected as this promising hybrid adsorbent is used for Cs removal in Fukushima wastewater.

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confidence: 99%

A Reliable Hybrid Adsorbent for Efficient Radioactive Cesium Accumulation from Contaminated Wastewater

Awual

Yaita

Miyazaki

et al. 2016

Sci Rep

193

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“…Comparing the fitting parameters for the two kinetic models (Table 2), it can be seen that the pseudo-second order model provides much better agreement to the measured Sr 2+ adsorption kinetics for all PSA membranes, as shown by the linear plot in Figure 5(D) with the coefficients of determination greater than 0.99. As such, Sr 2+ adsorption by all PSA membranes likely follows a chemisorption process such as ion exchange rather than physisorption [45,46].…”

Section: Pseudo-first Order Equation Lnmentioning

confidence: 99%

A high-strength polyvinyl alcohol hydrogel membrane crosslinked by sulfosuccinic acid for strontium removal via filtration

Yoon

Zhang

Kim

et al. 2019

Journal of Environmental Chemical Engineering

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This study considered the removal of strontium (Sr 2+) from contaminated water using a filtration membrane that exhibits good mechanical strength, high adsorption capacity, and the ability to be regenerated and reused. Polyvinyl alcohol hydrogel membranes were prepared by crosslinking with sulfosuccinic acid in different ratios (2.5, 5, 10 and 20 mol% relative to the PVA monomer), named as PSA2.5, PSA5, PSA10 and PSA20. All PSA membranes showed good Sr 2+ adsorption over a wide pH range (pH 2-12), and maintained rapid removal kinetics (> 95 % Sr 2+ recovered from 5 ppm Sr 2+ within 4 h). Furthermore, the Sr 2+ adsorption capacities of PSA2.5, PSA5, PSA10 and PSA20 were 27.6, 45.8, 56.3, and 55.3 mg/g, respectively, based on the Langmuir adsorption isotherm. From the four PSA membranes, PSA5 was selected for further filtration studies due to its favorable mechanical and adsorption properties. When filtering 5 ppm Sr 2+ and 250 ppm Ca 2+ , corresponding to the Ca 2+ concentration in the wastewater at the Fukushima nuclear plant, 87% Sr 2+ was removed using the PSA5 membrane following multiple cycles of regeneration and reuse. Moreover, the tensile strength of the PSA5 membrane remained high (> 100 MPa) following five consecutive uses.

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“…The advantages of the sodium alginate polymer in terms of low cost, abundance and environmental friendliness cannot be denied. Thus, the other materials can be part of a sodium alginate-based membrane to reduce the drawbacks, as previous studies have reported [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Molecular level studies have been implemented on biopolymer types such as chitosan, as carried out by LópezChávez et al.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of sodium alginate/sulfonated graphene oxide membranes properties

Shaari

Kamarudin

Basri

2018

Heliyon

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The influence of methanol as a solvent on the properties of sodium alginate/sulfonated graphene oxide (SA/SGO) membranes was explored in water-methanol mixed conditions with various methanol concentrations and temperatures through molecular dynamics simulations. The methanol uptake of the membrane showed an isolation phase determined from the simulation results. The distance between the sulfonic acid groups increased in higher methanol concentrations, as observed from S-S RDFs. Furthermore, the distance between the SA-chain RDFs and the solvent molecules was analysed to determine a) the affinity of water towards the sulfonic acid groups and b) the affinity of the aromatic backbone of the SA towards methanol molecules. A decrease in water molecule diffusion led to an increase in methanol diffusion and uptake. SA/SGO membranes exhibited a smaller diffusion coefficient than that for the Nafion membranes, as calculated from simulation results and compared to the experimental work. Additionally, the diffusion ability increased at higher temperatures for all permeants. The interaction information obtained is useful for DMFC applications.

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Sodium cobalt hexacyanoferrate encapsulated in alginate vesicle with CNT for both cesium and strontium removal

Cited by 67 publications

References 38 publications

A Reliable Hybrid Adsorbent for Efficient Radioactive Cesium Accumulation from Contaminated Wastewater

A Reliable Hybrid Adsorbent for Efficient Radioactive Cesium Accumulation from Contaminated Wastewater

A high-strength polyvinyl alcohol hydrogel membrane crosslinked by sulfosuccinic acid for strontium removal via filtration

Molecular dynamics simulations of sodium alginate/sulfonated graphene oxide membranes properties

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