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Adsorption of Cr(VI) from Aqueous Solutions Using Algerian Pinus Halepensis Tannin Foam
Zeyneb Hamadi,Rabah Chaid,Mohammed Kebir,Siham Amirou,Hisham Essawy,Antonio Pizzi 한국고분자학회 2020 폴리머 Vol.44 No.4
In this study, new adsorbent tannin foam was prepared from Algerian natural pinus halepensis tannin (APTF). The prepared material has been used as an efficient and environmentally friendly adsorbent to remove chromium (Cr(VI)), which is considered as the most toxic pollutant in wastewater. The different features of the adsorbent in terms of the structural and morphological characteristics were studied. The impact of different factors on the adsorption process, such as pH, adsorbent mass, initial Cr(VI) concentration, and temperature, was investigated. The data obtained from the Cr(VI) adsorption revealed an improvement of the removal efficiency with increasing the adsorbent dose, the pH had a notable effect on Cr(VI) adsorption capacity, whereas the effectiveness decreased by rising the initial metal concentration. In addition, it was observed that adsorption efficiency enhanced with increasing temperature, indicating that the adsorption was endothermic and spontaneous in nature. Moreover, the results were best represented by the pseudo-second order kinetic model and the Langmuir isotherm model (qm = 400 mg·g<SUP>-1</SUP>) at 293 °K and pH ~2.
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( Jessica Hendrik ),( Yusuf Sudo Hadi ),( Muh Yusram Massijaya ),( Adi Santoso ),( Antonio Pizzi ) 한국목재공학회 2019 목재공학 Vol.47 No.3
This study characterized the chemical compounds in tannin from mangium (Acacia mangium) bark extract and determined the physical-mechanical properties of glued laminated timber (glulam) made from sengon (Falcataria moluccana), jabon (Anthocephalus cadamba), and mangium wood. The adhesives used to prepare the glulam were based on mangium tannin and phenol resorcinol formaldehyde resin. Five-layer glulam beams measuring 5 cm × 6 cm × 120 cm in thickness, width, and length, respectively, were made with a glue spread of 280 g/m<sup>2</sup> for each glue line, cold pressing at 10.5 kgf/cm<sup>2</sup> for 4 h and clamping for 20 h. Condensed mangium tannin consisted of 49.08% phenolic compounds with an average molecular weight of 4745. The degree of crystallinity was 14.8%. The Stiasny number was 47.22%. The density and the moisture content of the glulams differed from those of the corresponding solid woods with mangium having the lowest moisture content (9.58%) and the highest density (0.66 g/cm<sup>3</sup>). The modulus of rupture for all glulam beams met the JAS 234-2003 standard but the modulus of elasticity and the shear strength values did not. Glulam beams made with tannin had high delamination under dry and wet conditions, but glulam made from sengon and jabon wood met the standard’s requirements. All glulam beams had low formaldehyde emissions and were classified as F**** for formaldehyde emissions according to the JAS 234 (2003) standard.
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