Alkaline surface modification of sugar cane bagasse

Lpez, R.; Poblano, V. M.; Licea-Clavere, A.; Ávalos, Martina; Álvarez-Castillo, A.; Castao, V. M.

doi:10.1163/15685510051029219

Cited by 35 publications

(22 citation statements)

References 8 publications

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“…The minimum transmittance peaks of B at 3411, 1427, 1323, 1163, 1053 and 1037 cm À1 were shifted to 3448,1421,1315,1159,1063 and 1022 cm À1 , respectively, for MMB (Figure not shown) (Gurgel et al, 2008a). Besides these changes observed, the treatment of the sugarcane bagasse with NaOH 5 mol/L caused the dissolution of part of the lignin (López et al, 2000) and the polyoses, which justified the observed mass loss. FTIR (Figure not shown) showed the disappearance of the characteristic band of lignin at 1604 cm À1 , which corresponds to the aromatic skeletal modes, along with other characteristic bands of lignin and polyoses at 1736, 1514 and 1254 cm À1 , which correspond to the carbonyl stretching of ketone, skeletal modes and C-O-C stretching, respectively (Bilba & Ouensanga, 1996).…”

Section: Characterization Of C Mc B Mb and Mmb By Ftirmentioning

confidence: 58%

Adsorption of Cu(II), Cd(II), and Pb(II) from aqueous single metal solutions by mercerized cellulose and mercerized sugarcane bagasse chemically modified with EDTA dianhydride (EDTAD)

Júnior

Gurgel

Freitas

et al. 2009

Carbohydrate Polymers

216

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a b s t r a c tThis work describes the preparation of new chelating materials derived from cellulose and sugarcane bagasse for adsorption of Cu 2+ , Cd 2+ , and Pb 2+ ions from aqueous solutions. The first part involved the mercerization treatment of cellulose and sugarcane bagasse with NaOH 5 mol/L. Non-and mercerized cellulose and sugarcane bagasse were then reacted with ethylenediaminetetraacetic dianhydride (EDTAD) in order to prepare different chelating materials. These materials were characterized by mass percent gain, X-ray diffraction, FTIR, and elemental analysis. The second part consisted of evaluating the adsorption capacity of these modified materials for Cu 2+ , Cd 2+ , and Pb 2+ ions from aqueous single metal solutions, whose concentration was determined by atomic absorption spectroscopy. These materials showed maximum adsorption capacities for Cu 2+ , Cd 2+ , and Pb 2+ ions ranging from 38.8 to 92.6 mg/g, 87.7 to 149.0 mg/g, and 192.0 to 333.0 mg/g, respectively. The modified mercerized materials showed larger maximum adsorption capacities than modified non-mercerized materials.

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Section: Characterization Of C Mc B Mb and Mmb By Ftirmentioning

confidence: 58%

Adsorption of Cu(II), Cd(II), and Pb(II) from aqueous single metal solutions by mercerized cellulose and mercerized sugarcane bagasse chemically modified with EDTA dianhydride (EDTAD)

Júnior

Gurgel

Freitas

et al. 2009

Carbohydrate Polymers

216

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“…34 As an alternative explanation, it has been proposed that glucan dissolution is incomplete because CaCO 3 deposits (possibly obtained from CO 2 that results from degradation and reacts with Ca(OH) 2 ) prevent the occurrence of peeling reactions; thus, glucan peeling only occurs to a limited extent. 35 Degradation of slow glucan may also benefit from stopping reactions and salt deposits. The minimum glucan yield for nonoxidative pretreatment was 0.69 g glucan remaining/g glucan in raw biomass for the most aggressive pretreatment (12 weeks at 65 C).…”

Section: Glucan Degradationmentioning

confidence: 99%

Selectivity and delignification kinetics for oxidative and nonoxidative lime pretreatment of poplar wood, part III: Long‐term

Sierra¹,

García

Holtzapple³

2010

Biotechnology Progress

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Lime pretreatment is an effective method for improving lignocellulose digestibility by removing lignin. For several weeks, mixtures of poplar wood, water, and calcium hydroxide (lime) were submitted to temperatures from 25 to 65°C, with and without aeration. Kinetic models for lignin and carbohydrate degradation were obtained as functions of temperature, time, and aeration using first-order kinetics in lignin and carbohydrates. Model 1 considered two reacting moieties (slow and fast), and Model 2 considered three (slow, medium, and fast). Model 1 was statistically better and was employed to determine differential and integral selectivities, which measure the ability of pretreatment to retain carbohydrates while removing lignin. During the first 2 weeks, when lignin content ≥ 0.80 g/g lignin in raw biomass, both glucan and xylan differential and integral selectivities decreased rapidly. Afterwards, selectivities were nearly constant ranging between 0 and 3 g lignin removed/g carbohydrate degraded.

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“…Após a modificação não houve o surgimento considerável de novos grupos funcionais aos que já existiam no material in natura, a não ser uma mudança no formato do pico em 1421 cm -1 , referentes aos grupos carboxilas (Pavan et al, 2006) sugerindo uma possível alteração química no resíduo. Além disso, ocorreu o desaparecimento da banda em 1250 cm -1 , fato que pode ser atribuído à lignina que pode ter sido extraída pela adição de NaOH (M-S, E-S) (López et al, 2000). Quanto à modificação com NaOH e ácido cítrico (M-SAC, E-SAC) observou-se alteração no pico em 1740 cm -1 , sugerindo uma esterificação dos resíduos.…”

Section: Methodsunclassified

Biossorção de cobre utilizando-se o mesocarpo e o endocarpo da macadâmia natural e quimicamente tratados

Boas

Casarin

Caetano

et al. 2012

Rev. bras. eng. agríc. ambient.

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2+). The chemical changes in the biosorbent with sodium hydroxide (NaOH) and with NaOH and citric acid were evidenced by infrared spectroscopy by the appearance of peaks in 1710 and 1420 cm -1 and by scanning electron microscopy, observed an increase of roughness on the surface. The best results of the adsorption were observed in mesocarp modified with NaOH, in pH equal to 5. An equilibrium time adsorbent -adsorbate was 140 min, in addition, the system followed a kinetic model of pseudo-second order and the maximum adsorption capacity was 28.82 mg g -1 . The isotherms for the residues modified with NaOH followed the Langmuir model and the modified with acid were adjusted to the Freundlich model. It was found that the adsorption process was energetically spontaneous due to negative values for the Gibbs energy and the adsorbent has a high capacity of desorption, so this material can be reused. Therefore, this residue is an excellent material to equip future filters for removal of copper II.

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Alkaline surface modification of sugar cane bagasse

Cited by 35 publications

References 8 publications

Adsorption of Cu(II), Cd(II), and Pb(II) from aqueous single metal solutions by mercerized cellulose and mercerized sugarcane bagasse chemically modified with EDTA dianhydride (EDTAD)

Adsorption of Cu(II), Cd(II), and Pb(II) from aqueous single metal solutions by mercerized cellulose and mercerized sugarcane bagasse chemically modified with EDTA dianhydride (EDTAD)

Selectivity and delignification kinetics for oxidative and nonoxidative lime pretreatment of poplar wood, part III: Long‐term

Biossorção de cobre utilizando-se o mesocarpo e o endocarpo da macadâmia natural e quimicamente tratados

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