Hyperbranched grafting enabling simultaneous enhancement of the boric acid uptake and the adsorption rate of a complexing membrane

Meng, Jianqiang; Cao, Jingjing; Xu, Ruisong; Wang, Zhe; Sun, Rongbo

doi:10.1039/c6ta02348g

Cited by 59 publications

(28 citation statements)

References 49 publications

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“…Boric acid -carbohydrate interactions are well known [32]; although a stronger complex is formed at basic pH than at acidic pH, equilibrium between the boric acid and the borate ester is present. While such experimental evaluation was not performed in this work, it has recently been well documented, including for membranes [33,34]. The residence time of boron on each binding site may be a reasonable explanation for the boron rejection.…”

Section: Boron Rejectionmentioning

confidence: 94%

Polyol-functionalized thin-film composite membranes with improved transport properties and boron removal in reverse osmosis

Vincenzo

Barboiu

Tiraferri

et al. 2017

Journal of Membrane Science

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Thin-film composite membranes comprising modified polyamide layers were cast on an ultrafiltration polysulfone support using sequential interfacial polymerization, thus obtaining bilayer membranes with a final layer of polyols at the surface. A traditional polyamide layer made by interfacial polymerization of trimesoyl chloride and m-phenylene diamine, as well as a reference bilayer membrane with a topmost layer of m-phenylenediamine, were compared with novel bilayer membranes containing N-Methyl-D-glucamine, (±) 3-amino-1,2propanediol, or serinol functionalizations. Filtration experiments performed with pure water, or with solutions containing 2000 mg/L NaCl and 5 mg/L boric acid, indicated that the water permeance of the modified membranes was improved with no associated loss of salt rejection compared to reference membranes. In particular, functionalization using (±)-3-amino-1,2propanediol allowed achievement of the highest water flux and the best rejection (NaCl permeance, B, of 0.18 L m-2 h-1) with 40% reduction in salt passage compared to the reference membranes (B of 0.26 L m-2 h-1). Bilayer membranes also showed enhancement in boron removal, performing about 90% observed boron rejection at pH 5.2, condition under which boron is mostly present as neutral boric acid. The strategy employed in the present work allows for robust design of TFC membrane consisting of active layers with improved water permeance and boron rejection performances.

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Section: Boron Rejectionmentioning

confidence: 94%

Polyol-functionalized thin-film composite membranes with improved transport properties and boron removal in reverse osmosis

Vincenzo

Barboiu

Tiraferri

et al. 2017

Journal of Membrane Science

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“…The boric acid could reversibly adsorb and desorb from the surface of the chitosantannic acid functional paper by formation and dissociation of borate with catechol at pH = 10 and pH = 4, respectively (Scheme 1). The adsorption ability was superior to most other studies (Erdem et al 2013;Meng et al 2016;Zhang et al 2017).…”

Section: Introductionmentioning

confidence: 56%

“…Adsorbents have been reported for the selective adsorption of boric acid after complexing with the hydroxyl of boric acid; these are resistant to interference by the coexisting salts during adsorption (Meng et al 2016;Lyu et al 2017;Sun et al 2018) However, most of these adsorbents mainly focus on the use of anion-exchange resin, activated carbon, and magnetic sorbents as carriers, and these carriers usually involve sophisticated preparation processes, complicated structures, and are expensive. This limits their application in the removal of boric acid.…”

Section: Introductionmentioning

confidence: 99%

Efficient and reversible removal of boric acid by chitosan/tannic acid functional paper

Sun

Xia

et al. 2019

BioRes

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It is important to remove excessive concentrations of boric acid from water because it can lead to environmental problems. However, current adsorbents are limited in separating boric acid from water due to their low desorption capability and poor selectivity for boric acid. In this study, the authors developed a functional cellulosic paper via crosslinking cellulose and tannic acid with chitosan to efficiently and reversibly remove boric acid from water. The adsorption capacity reached 769 mg/m2 according to the Langmuir model. The corresponding desorption rate of the chitosan/tannic acid-modified paper exceeded 80% in the whole flow rate region ranging from 15 to 250 mL/h. The reversible adsorption and desorption of boric acid were attributed to the formation and dissociation of the borate bond between the tannic acid and boric acid, respectively, at different pH values. This study improved the selectivity, batch adsorption, expensive carriers, and desorption difficulties of existing boric acid adsorption materials. This approach offers a new way to design highly efficient adsorption/desorption materials by constructing reversible chemical bonds for removal of other pollutants.

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“…As it is known, the adsorption kinetics of boric acid on the affinity membrane is mainly affected by boron diffusion between layers of the polyhydroxy copolymer on the surface of the affinity film and the interaction between boric acid and hydroxyl functional groups. Meng et al [19] pointed out that the hyperbranched polymer scaffold is beneficial to superior boron-uptake performance.…”

Section: Resultsmentioning

confidence: 99%

“…By comparing the ligand structures of polyhydroxy polymers, Du et al [18] found that the presence of the amino group and the branched chain structure are beneficial to improve the complexing efficiency. Recently, hyperbranched-polyol-tethered membranes were proved to be highly effective and fast adsorbent, but their preparation conditions are more demanding [19,20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Negatively Charged Polyol-Functional PSF Membranes with Good Hydrophilic and Efficient Boron Removal Properties

Jin

et al. 2019

Polymers

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Boron removal remains a major barrier to water purification, it is important to develop a specialized adsorption membrane for boron removal. By means of a simple and effective method, a hydrophilic membrane for boron removal with a polyhydroxy functional group on the surface was prepared. Firstly, a polysulfone (PSF) membrane was modified by co-depositing polyethyleneimine (PEI) with dopamine (DA) in one-step to produce amine-rich surfaces, then the DA/PEI-functionalized membranes were reacted with glycidol, with the prepared membranes corresponding to PSF-PDA/PEI membranes and PSF-diol membranes. The prepared membranes were characterized by water-uptake, FTIR, (X-ray photoelectron spectroscopy) XPS, (Field emission scanning electron microscope) FESEM, and zeta potential measurements. The hydrophilicity of the membrane was characterized by the static water contact angle (WCA) test. In addition, we systematically studied the impact of initial boron concentration, chelating time, and pH value on boron removal performance. The results showed that the PSF-diol membrane had strong hydrophilicity with a WCA of about 38°. The maximum adsorption capacity of boron appeared to be 1.61 mmol/g within 10 min at a boron concentration of 300 mg/L. Adsorption kinetics showed that saturation adsorption can be achieved in minutes at the initial concentration of 5 mg/L, which is beneficial to a rapid filtration process.

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Hyperbranched grafting enabling simultaneous enhancement of the boric acid uptake and the adsorption rate of a complexing membrane

Abstract: Hyperbranched polyols were grafted onto a PAN membrane via a two-step process for boron removal. The grafted hyperbranched scaffold was utilized to optimize the ligand distribution so that a complexing membrane with both high capacity and high adsorption rate was obtained.

Cited by 59 publications

References 49 publications

Polyol-functionalized thin-film composite membranes with improved transport properties and boron removal in reverse osmosis

Polyol-functionalized thin-film composite membranes with improved transport properties and boron removal in reverse osmosis

Efficient and reversible removal of boric acid by chitosan/tannic acid functional paper

Synthesis of Negatively Charged Polyol-Functional PSF Membranes with Good Hydrophilic and Efficient Boron Removal Properties

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