Flexible core-shell/bead-like alginate@PEI with exceptional adsorption capacity, recycling performance toward batch and column sorption of Cr(VI)

Yan, Yong‐Zhu; An, Qingda; Xiao, Zuoyi; Zheng, Wei; Zhai, Shangru

doi:10.1016/j.cej.2016.12.099

Cited by 309 publications

(78 citation statements)

References 39 publications

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“…S1 †). 28,44,48,49 Beads were approximately 2.5 mm in diameter (Fig. S2 †), with no observed size differences between Ca-alginate, Sr-alginate, or Ba-alginate beads.…”

Section: Cell Encapsulationmentioning

confidence: 99%

“…28,[38][39][40] Polyethylenimine (PEI), a polycation, has also been used to coat alginate polymers, achieving even higher stability. 31,[41][42][43][44] A layer-by-layer composite coating of silica gel and PEI has been developed by Lee and coworkers, further increasing the structural rigidity and longevity of encapsulation matrices. 45 In this research we tested the hypothesis that encapsulation could facilitate resource recovery from wastewater in the form of hydrogen production during anaerobic treatment.…”

Section: Introductionmentioning

confidence: 99%

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Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Zhu

Arnold

Sakkos

et al. 2018

Environ. Sci.: Water Res. Technol.

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aIn addition to methane gas, higher-value resources such as hydrogen gas are produced during anaerobic wastewater treatment. They are, however, immediately consumed by other organisms. To recover these high-value resources, not only do the desired phenotypes need to be retained in the anaerobic reactor, but the undesired ones need to be washed out. In this study, a well-established alginate-based polymer gel, with and without a coating layer, was used to selectively encapsulate hydrogen-producing biomass in beads to achieve high-rate recovery of hydrogen during anaerobic wastewater treatment. , as well as a composite coating on the beads, consisting of alternating layers of polyethylenimine and silica hydrogel, were investigated with respect to their performance, specifically, their mass transfer characteristics and their differential ability to retain the encapsulated biomass. Although the coating reduced the escape rate of encapsulated biomass from the beads, all alginate polymer matrices without coating effectively retained biomass. Fast diffusion of dissolved organic carbon (DOC) through the polymer gel was observed in both Ca-alginate and Sr-alginate without coating. The coating, however, decreased either the diffusivity or the permeability of the DOC depending on whether the DOC was from synthetic wastewater (more lipids and proteins) or real brewery wastewater (more sugars). Consequently, the encapsulation system with coating became diffusion limited when brewery wastewater with high chemical oxygen demand was fed, resulting in a lower hydrogen production rate than the uncoated encapsulation systems. In all cases the encapsulated biomass was able to produce hydrogen, even at a hydraulic residence time of 45 min. Although there are limitations to this system, the used of encapsulated biomass for resource recovery from wastewater shows promise, particularly for highrate systems in which the retention of specific phenotypes is desired.

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“…S1 †). 28,44,48,49 Beads were approximately 2.5 mm in diameter (Fig. S2 †), with no observed size differences between Ca-alginate, Sr-alginate, or Ba-alginate beads.…”

Section: Cell Encapsulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Zhu

Arnold

Sakkos

et al. 2018

Environ. Sci.: Water Res. Technol.

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“…As shown in Fig. (a), the C1s spectra of the pristine IIP‐PEI/CM comprise four peaks with the binding energies at 284.3, 285.2, 286.3 and288.0 eV, which can be assigned to CC, CN, CO and CO respectively . After uptake of W(VI) onto IIP‐PEI/CM (Fig.…”

Section: Resultsmentioning

confidence: 98%

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Dong

Zeng

Zhou

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: It is significantly important to develop new technologies and materials for removal of tungstate anions (W(VI)) from aqueous solutions. An ion imprinted membrane not only possesses all virtues of a separation membrane, but also has tailor-made recognition sites. In this work, a novel surface anion-imprinted ceramic membrane (IIP-PEI/CM) was fabricated to remove W(VI) selectively from aqueous solutions. RESULTS: FT-IR, XPS, TGA, SEM, streaming potential, pore size distribution and water flux confirmed the successful fabrication of IIP-PEI/CM. With increasing pH, binding capacities (Q e ) of W(VI) onto IIP-PEI/CM and non-imprinted membrane (NIP-PEI/CM) rapidly decreased. At pH = 2.0, Q e values of IIP-PEI/CM and NIP-PEI/CM were 139.4 and 47.9 mg 100 g −1 , respectively. Binding equilibrium was achieved within 3 min, showing an ultra-fast kinetic process. Compared with NIP-PEI/CM, IIP-PEI/CM had higher selectivity for W(VI) in the presence of Mo(VI) and Cr(VI) ions, and its selectivity coefficients for W(VI)/Mo(VI) and W(VI)/Cr(VI) were 15.47 and 19.74, respectively. During dynamic filtration, IIP-PEI/CM was effective and selective for removal of W(VI), and it had a good reusability. Protonated amine groups within PEI participated the uptake of W(VI) by electrostatic interactions. CONCLUSION: IIP-PEI/CM showed ultrafast and selective binding of W(VI) anions, and has potential application for W(VI) removal/recovery from aqueous solutions.

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“…In addition, the equilibrium binding capacity of M3 is higher than that of CM. The binding data were correlated with the pseudo first‐order (Equation ) and pseudo second‐order (Equation ) kinetic models

Q_{t} = Q_{e} ((), 1 - e^{- k_{1} t}),

Q_{t} = \frac{k_{2} {Q_{normale}}^{2} t}{(1 + k_{2} Q_{normale} t)},

…”

Section: Resultsmentioning

confidence: 99%

Ion‐imprinted poly(methyl methacrylate‐vinyl pyrrolidone)/poly(vinylidene fluoride) blending membranes for selective removal of ruthenium(III) from acidic water solutions

Zeng

Zhang

Zhou

et al. 2019

Polymers for Advanced Techs

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While conventional approaches have been studied for removal of ruthenium(III) ions (Ru(III)), this work focuses on the applicability of ion‐imprinted poly(methyl methacrylate‐vinyl pyrrolidone)/poly(vinylidene fluoride) blending membranes (Ru(III)–ion‐imprinted membrane[IIM]) for selective removal of Ru(III) from acidic water solutions. In order to measure the effectiveness of these imprinted membranes, after fabrication, binding experiments were done with aqueous Ru(III) solutions. The results showed that Ru(III)‐IIMs were fabricated successfully at various blending ratios, and their chemical components, microstructures, hydrophilicity, and water fluxes were measured. In pH range 0.5 to 5.0, binding capacity (Qe) of Ru(III) onto Ru(III)‐IIM increases remarkably with pH and then reaches to a maximum value (53.52 mg/g) at pH 1.5. After that, Qe gradually decreases. Compared with a nonimprinted membrane, Ru(III)‐IIM demonstrates higher selectivity for Ru(III) at pH 1.5 in the presence of Ni(II) and Cu(II) ions, and its selectivity coefficients for Ru(III)/Ni(II) and Ru(III)/Cu(II) are 3.70 and 3.32, respectively. Also, Ru(III)‐IIM shows a good chemical stability and reusability. C─N and C═O bonds within poly(vinyl pyrrolidone) segments of poly(methyl methacrylate‐vinyl pyrrolidone) (P(MMA‐VP)) participate the uptake of Ru(III). Ru(III)‐IIM exhibited excellent hydrophilicity and Ru(III) selective adsorption ability and reusability and has potential to be used for Ru(III) removal from acidic water solutions.

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Flexible core-shell/bead-like alginate@PEI with exceptional adsorption capacity, recycling performance toward batch and column sorption of Cr(VI)

Cited by 309 publications

References 39 publications

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Achieving high-rate hydrogen recovery from wastewater using customizable alginate polymer gel matrices encapsulating biomass

Selective removal of tungstate anions from aqueous solutions by surface anion‐imprinted ceramic membranes

Ion‐imprinted poly(methyl methacrylate‐vinyl pyrrolidone)/poly(vinylidene fluoride) blending membranes for selective removal of ruthenium(III) from acidic water solutions

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