Metal adsorption of tannin based rigid foams

Tondi, Gianluca; Oo, Chuan Wei; Pizzi, A.; Trosa, A.; Thévenon, Marie-France

doi:10.1016/j.indcrop.2008.06.006

Cited by 108 publications

(56 citation statements)

References 15 publications

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“…A second important feature of the flavonoids is their ability to coordinate heavy metal ions (Lotz and Hollaway 1988;Yamaguchi and Okuda 1998;Tondi et al 2009b). The empty orbitals of metals attract the electrons of these compounds and fix them in stable complexes.…”

Section: Introductionmentioning

confidence: 99%

Tannin-boron preservatives for wood buildings: mechanical and fire properties

et al. 2012

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The remarkable biological properties of tanninboron wood preservatives for outdoor applications have been investigated recently (Thevenon et al. in Eur. J. Wood Prod. 67:89, 2009). In the present paper mechanical and fire-proofing attributes of these formulations are determined. Mechanical properties of Scots pine and beech specimens treated with tannin-based formulations were examined in compression and bending strength tests and surface hardness was determined. The tannin-hexamine formulations reticulated into the wood structure improve the strength of the treated specimens. The treated samples which underwent compression, bending, hardness and gluing tests showed improvements of on average 20%.Fire tests have been monitored regarding short and long flame exposure time. Short tests such as ignition, flame and ember time have allowed the ignition of the fire to be simulated, while the weight loss tests have provided a good overview of the behavior of the specimens during prolonged fire. A positive effect on fire-resistance is shown when wood is treated with tannin formulations. The fire-proofing properties of the resin have been upgraded adding boron and phosphorus. The ember time of the pieces treated using this method can be reduced by up to ten times.

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Section: Introductionmentioning

confidence: 99%

Tannin-boron preservatives for wood buildings: mechanical and fire properties

et al. 2012

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“…In absence of water, it showed to be a much more effective method than any of the other exposed above, with the tannin foam being again fire-resistant (Basso et al 2014b,d). Some unusual applications such as using the first-and second-generation foams as filters for the elimination of heavy metals such as Pb and Cu in water were also investigated (Oo et al 2009;Tondi et al 2009b). These were based on the welldocumented ability of the B-ring of flavonoids to form orthodiphenol complexes with heavy metals.…”

Section: Biobased Wood-derived Foamsmentioning

confidence: 99%

Wood products and green chemistry

Pizzi

2016

Annals of Forest Science

163

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& Key message Green chemistry for and from wood has developed numerous industrial products, namely biosourced, green wood adhesives and preservatives, foams, composite matrices, laminates, hard and flexible plastics, flexible films, and abrasive grinding discs, and their number is still growing. & Introduction This review addresses (1) the elimination of toxic aldehydes from the most common wood panel adhesive, the one based on urea, itself a natural product, (2) biosourced adhesives derived from wood or other vegetable matter and used for wood products, and (3) wood and bark tannin-based foams, natural fiber composites using tannin matrices, paper surface laminates and continuous high-pressure paper laminates using tannin-furanics, hard plastics based on tanninfuranic materials and some of their applications, flexible biosourced tannin-furanic films, and biosourced wood preservatives.

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“…Adsorption Various experimental methods have been described for tannin gelation. Most of these involve the use of formaldehyde or other aldehydes in a basic or acidic medium (Nakano et al, 2001;Kim and Nakano, 2005;Tondi et al, 2009), while other researchers have reported on acid gelation (Vázquez et al, 2002(Vázquez et al, , 1994. Recently, we developed a simple and environmentally friendly method for preparing water-insoluble persimmon tannin gels based on commercial kaki-shibu without the use of harmful reagents or catalysts (Kunimoto, 2011).…”

Section: Pt Gel Was Used In All Adsorption Experimentsmentioning

confidence: 99%

Persimmon Tannin Gel: Formation by Autoxidation and Caffeine Adsorption Properties

Ahmad

Linh

Akimoto

et al. 2013

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Water-insoluble gel was prepared from persimmon tannin (PT) solution by the autoxidation process. The gelation reaction proceeded by applying oxygen gas and natural light to the aqueous PT solution, without using harmful reagents or catalysts. Adsorption behavior of the PT gel was assessed using caffeine. Batch adsorption studies were conducted to evaluate the influence of experimental parameters such as contact time, initial concentration of adsorbates, adsorbent dose and temperature. The equilibrium data were analyzed using Freundlich and Langmuir isotherm models. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy changes were also calculated, showing that caffeine adsorption on the PT gel is an exothermic process and feasible at lower temperatures. The present results suggest that the PT gel can be used as an effective adsorbent for removing caffeine from solutions.Keywords: adsorption, autoxidation, caffeine, gel, isotherm, persimmon tannin *To whom correspondence should be addressed. E-mail: loahmad@stu.kanazawa-u.ac.jp (L.O. Ahmad) kunimoto@se.kanazawa-u.ac.jp (K. Kimoto) IntroductionTannins are a group of polyphenol compounds that are distributed widely in many plant species, where they serve as defense mechanisms against predators. Persimmon fruits (Diospyros kaki L.) are rich in soluble and non-soluble condensed tannins (proanthocyanidins). Low molecular weight soluble tannins are believed to be responsible for the astringency of the persimmon fruit (Matsuo and Ito, 1978). Tannins are also known to form complexes and precipitates with macromolecules, such as proteins and polysaccharides, alkaloids, and heavy metals (Haslam, 1989).Chemical characterization of persimmon tannin (PT) has long been hampered because of its heterogeneous character and high molecular weight. Matsuo and Ito (1978) first reported on the composition and structure of persimmon condensed tannin. Their proposed structure consists of coupled flavan-3-ols, catechin, catechin-3-O-gallate, gallocatechin, and gallocatechin-3-O-gallate residues as the repeating units, with a molar ratio of 1:1:2:2, respectively. They also showed that the PTs are large molecular weight (ca. 13.8 kDa) polymers belonging to the proanthocyanidin B group, with carbon-carbon interflavan linkages between C-4 of one unit and C-8 (or C-6) of another. According to Xu et al. (2012), the stereochemistry of the flavan-3-ol unit of the PT is mainly 2,3-cis, which corresponds to epi-type catechins as shown in Fig. 1.Kaki-shibu, a fermented product made from the juice of immature astringent persimmons, is an important source of condensed tannins traditionally used in tanning paper (fiber hardening) and fishing nets (corrosion prevention), and for removing protein during the brewing of rice wine "sake" and soy sauce in Japan (Sugiura and Subhadrabandhu, 1996). PT gel was used in all adsorption experiments.A stock solution of caffeine (1,000 mg/L) was prepared by dissolving the required amount of caffeine in ultrapure water. The stock solution was ...

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Metal adsorption of tannin based rigid foams

Cited by 108 publications

References 15 publications

Tannin-boron preservatives for wood buildings: mechanical and fire properties

Tannin-boron preservatives for wood buildings: mechanical and fire properties

Wood products and green chemistry

Persimmon Tannin Gel: Formation by Autoxidation and Caffeine Adsorption Properties

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