Adsorption removal of boron in aqueous solutions by amine-modified tannin gel

Morisada, Shintaro; Rin, Tetsuzen; Ogata, Takeshi; Kim, Yoen‐Ho; Nakano, Yoshiaki

doi:10.1016/j.watres.2011.05.010

Cited by 64 publications

(30 citation statements)

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“…The proposed adsorption mechanism involves the chelate formation between the tetrahydroxyborate ion and hydroxyl and amino groups on the adsorbent surface. The higher affinity of the amine-treated tannin gel to boron, in comparison to the unmodified tannin gel, is due to the strong coordination bounds between boron and nitrogen [14].…”

Section: Removal Of Heavy Metals and Toxic Metalloidsmentioning

confidence: 99%

“…2 presents schematically several ways to obtain an amine-modified TBA. The simplest procedure involves an ammonia treatment of the tannin resin (after polymerization with formaldehyde) [14,60]. Kim et al [59] optimized ammonia treatment procedure, in terms of ammonia concentration, time and temperature, in order to get a maximum amount of amino groups introduced into tanningels.…”

Section: Modified Tannin Gelsmentioning

confidence: 99%

“…An example of this is the targeting of boron by an amine-modified TBA, prepared by ammonia treatment of the tannin resin [14]. Boron is an element that occurs naturally, but it is also present in wastewaters from several industrial plants and, above certain concentrations, it is harmful for life beings.…”

Section: Removal Of Heavy Metals and Toxic Metalloidsmentioning

confidence: 99%

“…Tannins are inexpensive and ubiquitous natural polymers [14], polyphenolic secondary metabolites of higher plants, mainly present in soft tissues (sheets, needles or bark) [15,16]. After cellulose, hemicellulose, and lignin, tannins are the most abundant compounds extracted from biomass [16], leaves, roots, bark, seeds, wood and fruits [17].…”

Section: Introductionmentioning

confidence: 99%

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Section: Removal Of Heavy Metals and Toxic Metalloidsmentioning

confidence: 99%

Section: Modified Tannin Gelsmentioning

confidence: 99%

Section: Removal Of Heavy Metals and Toxic Metalloidsmentioning

confidence: 99%

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“…The maximum adsorption capacity was 8.87 mg/g, but this kind of resin had great pH dependence which affected its application. Morisada et al [11] used condensed tannin (a kind of cheap natural polymer containing polyphenolic hydroxyl structures extracted from plant leaves) to obtain a tannin gel (TG), and then they got an amino modified tannin gel (ATG) using ammonia. The maximum boron adsorption amounts of these two gels were 11.4 mg/g and Desalination 347 (2014) 138-143 24.3 mg/g respectively in alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

Boron removal using chelating resins with pyrocatechol functional groups

et al. 2014

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Adsorption recovery of rhodium(III) in acidic chloride solutions by amine‐modified tannin gel

Morisada

Rin

Ogata

et al. 2012

J of Applied Polymer Sci

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A tannin gel (TG), synthesized from condensed tannin molecules, has the remarkable ability to adsorb various metal ions in aqueous solutions. In the present study, the adsorption behavior of rhodium ion [Rh(III)] in acidic chloride solutions was investigated using an aminemodified tannin gel (ATG) prepared by the ammonia treatment of a TG. The ATG was able to adsorb Rh(III) in strong hydrochloric acid solutions, whereas the TG failed to adsorb it. This is because the amino group in the ATG can form a stable complex with Rh(III) compared to the hydroxy group. With increasing chloride ion concentration, the adsorption amount of Rh(III) onto the ATG decreased somewhat, while the number of chloride ligands in the Rh(III) complex was expected to increase. This suggests that the Rh(III) complexes with fewer chloride ligands are more favorable for adsorption onto the ATG. Also, the Rh(III) adsorbability of the ATG decreased significantly with decreasing initial pH because of the protonation of the hydroxy and amino groups in the ATG. The results obtained here indicate that in the Rh(III) adsorption onto the ATG, the solution pH is more influential than the chloride ion concentration. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E34-E38, 2012

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Adsorption removal of boron in aqueous solutions by amine-modified tannin gel

Cited by 64 publications

References 50 publications

Tannin-based biosorbents for environmental applications – A review

Tannin-based biosorbents for environmental applications – A review

Boron removal using chelating resins with pyrocatechol functional groups

Adsorption recovery of rhodium(III) in acidic chloride solutions by amine‐modified tannin gel

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