Crystal violet dye sorption and transport in/through biobased <scp>PVA</scp> cryogel membranes

Papancea, Adina; Paţachia, Silvia; Dobritoiu, Rodica

doi:10.1002/app.41838

Cited by 13 publications

(9 citation statements)

References 39 publications

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“…The removal of MB by PVA/agar/maltodextrin steadily surged within the first 80 min before reaching the plateau, meaning that the equilibrium between the surface of composites and dye molecules was achieved. At the first stage, the high adsorption rate of MB on the PVA/agar/maltodextrin may be attributed to the more significant number of available active sites on the surface . After 80 min of adsorption, the significant occupation of MB molecules on the external surface may act as a barrier hindering the active sites and other MB molecules leading to slow adsorption rates .…”

Section: Resultsmentioning

confidence: 99%

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Enhanced selective adsorption of cation organic dyes on polyvinyl alcohol/agar/maltodextrin water‐resistance biomembrane

Hoang

Nguyen

Bui

et al. 2019

J of Applied Polymer Sci

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In this study, we designed a novel hydrogel composite membrane based on the combination of polyvinyl alcohol (PVA), agar, and maltodextrin through a facile solution‐casting router. From Fourier‐transform infrared spectroscopy, contact angle, scanning electron microscopy, and swelling analyses, the formation of hydrogen bonds between surface functional groups of PVA, agar, and maltodextrin was confirmed. As a result, the PVA/agar/maltodextrin membranes exhibited a more hydrophobic nature compared with pure PVA. The thermal stability and integrity of such obtained composite membranes were also elucidated by the evaluation of thermogravimetric analysis and mechanical behavior. Besides, the composite membrane exhibited high selective adsorption for cationic dyes, namely 20.2 mg g−1 for methylene blue and 19.17 mg g−1 for crystal violet at initial dye concentration of 100 mg/L, an adsorbent dosage of 0.1 g, contact time of 180 min, and solution pH 7, while anionic dyes such as congo red and methyl orange are approximately zero. The adsorption kinetics and isotherm of the as‐prepared composite membranes were well fitted to the pseudo‐second‐order and Temkin model. The effect of factors, including contact time, solution pH, PVA content, and initial dye concentration on the adsorption capacity of the as‐prepared composite membrane was also investigated in detail. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48904.

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Section: Resultsmentioning

confidence: 99%

“…Papancea et al . reported the fabrication of PVA hydrogel membrane incorporated with bioinsertion, that is, scleroglucan, cellulose, and zein . The resulting membranes exhibited adsorption capacity for MB following the order: PVA/scleroglucan (15.19 mg g −1 ) > PVA/cellulose (6.07 mg g −1 ) > PVA/zein (5.58 mg g −1 ).…”

Section: Introductionmentioning

confidence: 96%

Enhanced selective adsorption of cation organic dyes on polyvinyl alcohol/agar/maltodextrin water‐resistance biomembrane

Hoang

Nguyen

Bui

et al. 2019

J of Applied Polymer Sci

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“…Nanoparticles have also been used for the removal of dyes, including TiO 2 nanoparticles (which have been investigated for their sorption capacity and photocatalytic efficiency [ 22 ]) and hollow zein nanoparticles for the removal of reactive blue [ 23 ]. Polyvinyl alcohol membranes containing scleroglucan, cellulose microfibers, or zein have been used for the removal of crystal violet [ 24 ]. Zein is a degradable, inexpensive, by-product of corn, and it is therefore an attractive material for environmental applications [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Trypan blue removal from water with zein sorbents and laccase

et al. 2021

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Zein-based materials were used to remove Trypan blue from water under flow conditions and in batch tests. In flow tests, zein dissolved at pH = 13 was injected in sand columns and subsequently coagulated with CaCl2, to create an adsorbent filter which removed over 99% of Trypan blue. Batch tests were conducted using zein powder, zein dissolved at pH = 13 and coagulated with CaCl2, Fe2Cl3 or citric acid, and zein dissolved in ethanol and then coagulated with water. The highest Trypan blue removal was achieved with zein powder (4000 mg Trypan blue/kg sorbent, as determined through spectrophotometry), followed by zein coagulated with Fe2Cl3 (500 mg Trypan blue/kg sorbent) and with other salts (140 mg Trypan blue/kg sorbent). Differences in the sorption efficiency are attributed to differences in the surface area. The sorption isotherm of Trypan blue onto zein-based sorbents was a Type II isotherm, suggesting physisorption. Desorption of Trypan blue was limited when zein-based coagulated sorbents were immersed in pure water. Trypan blue could be degraded by free laccase in water, as determined through spectrophotometry and electrospray ionization mass spectroscopy (ESI-MS). Trypan blue could also be degraded by laccase when zein-based laccase-containing sorbents were prepared at pH = 10, using Fe2Cl3 as coagulant. Graphic abstract

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“…Therefore, it is necessary to modify the membranes via physical or chemical crosslinking. Physical crosslinking methods, such as heat treatment and freezing–thawing, can promote the formation of hydrogen bonds among the hydroxyl groups of PVA; this leads to a higher crystallinity content and decreased swelling of the PVA membrane. However, the physical crosslinks are not as strong or stable as chemical crosslinks .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effects of crosslinking processes on the swelling and hygroscopic performances of a poly(vinyl alcohol) membrane

Gao

Wang

et al. 2016

J of Applied Polymer Sci

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Poly(vinyl alcohol) (PVA) membranes crosslinked with L-malic acid were prepared, and the effects of the heat-treatment temperature and crosslinker concentration on their swelling and hygroscopic performances were investigated. Both the swelling and hygroscopic performances of the PVA membranes decreased with increasing heat-treatment temperature; while the former decreased, the latter increased with increasing crosslinker concentration. The PVA membranes were characterized with differential scanning calorimetry (DSC), acid-base titration, and Fourier transform infrared spectrometry. The DSC results indicated that there was freezing and nonfreezing water in the swollen membranes, whereas there was only nonfreezing water in the moistened membranes. In addition, acid-base titration analysis revealed that both increased heat-treatment temperature and increased crosslinker concentration increased the bilateral ester group levels (crosslinking degree) and decreased the content of freezing water. By contrast, the content of hydrophilic groups decreased and increased with increasing heat-treatment temperature and crosslinker concentration, respectively; this resulted in decreased and increased levels of nonfreezing water, respectively.

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Crystal violet dye sorption and transport in/through biobased PVA cryogel membranes

Cited by 13 publications

References 39 publications

Enhanced selective adsorption of cation organic dyes on polyvinyl alcohol/agar/maltodextrin water‐resistance biomembrane

Enhanced selective adsorption of cation organic dyes on polyvinyl alcohol/agar/maltodextrin water‐resistance biomembrane

Trypan blue removal from water with zein sorbents and laccase

Experimental investigation of the effects of crosslinking processes on the swelling and hygroscopic performances of a poly(vinyl alcohol) membrane

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