Biosorption of aqueous chromium(VI) by Tamarindus indica seeds

Agarwal, Gargi; Bhuptawat, Hitendra; Chaudhari, Sanjeev

doi:10.1016/j.biortech.2005.04.030

Cited by 258 publications

(134 citation statements)

References 26 publications

(37 reference statements)

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“…At this point the total removal of the metal is carried out. The results are coincident for tamarind Shell with 95% of remotion at 58˚C and 3 hours [22], for the adsorption of Cadmium(II) from aqueous solution on natural and oxidized corncob (40˚C and 5 days) [27], but this are different for the mandarin waste [25], Caladium bicolor (wild cocoyam) biomass [28], and Saccharomyces cerevisiae [29]. The increase in temperature increases the rate of removal of Chromium(VI) and decreases the contact time required for complete removal of the metal, to increase the redox reaction rate [22].…”

Section: Effect Of Temperaturesupporting

confidence: 60%

“…Also, we observed the development of a blue-green and a white precipitate, which changes more rapidly at higher temperatures (date not shown). The results are coincident for tamarind Shell [13,22]. With respect to other biomass used, most authors report lower removal efficiencies of metal, for example: 45 mg/L for eucalyptus bark [16] acetate [31].…”

Section: Effect Of Initial Metal Concentrationmentioning

confidence: 56%

“…This was due to the dominant species ( and ) of Cr ions in solution expected to interact more strongly with the ligands carrying positive charges [21]. These results are like for tamarind shell [13], but the most of authors report an optimum pH of 2.0 like Tamarind shell [22], eucalyptus bark [16], bagassa and sugarcane pulp, coconut fibers and wool, [23], for the tamarind shell treated with oxalic acid [24], at pH of 2.0 and 5.0 for the mandarin bagassa [25], and almond green hull [26]. 2 4 CrO  2 2 7 Cr O …”

Section: Determination Of Hexavalent Trivalent and Total Crmentioning

confidence: 85%

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Hexavalent Chromium Removal by Citrus limonium Shell

Vargas-Morales¹,

Bautista-Mata²,

González³

et al. 2012

OJINM

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We studied the Chromium(VI) removal capacity in aqueous solution by the lemon shell, using the diphenylcarbazide method to evaluate the metal concentration. So, the highest biosorption of the metal (50 mg/L) occurs within 100 minutes, at pH of 1.0, and 28˚C. According to temperature, the highest removal was observed at 60˚C, in 11 minutes, when the metal (1 g/L) is completely adsorbed. At the analyzed concentrations of Cr(VI), lemon shell, showed excellent removal capacity, besides it removes efficiently the metal in situ (97.2% removal, 7 days of incubation, 5 g of biomass). After 1 hour of incubation the studied biomass reduces 1.0 g of Cr(VI) with the simultaneous production of Cr(III); so it can be used to eliminate it from industrial wastewater.

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Section: Effect Of Temperaturesupporting

confidence: 60%

Section: Effect Of Initial Metal Concentrationmentioning

confidence: 56%

Section: Determination Of Hexavalent Trivalent and Total Crmentioning

confidence: 85%

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Hexavalent Chromium Removal by Citrus limonium Shell

Vargas-Morales¹,

Bautista-Mata²,

González³

et al. 2012

OJINM

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“…Entretanto, a maioria dos estudos investiga o processo de preparação de bioadsorbente carbonizado visando o emprego no tratamento de efluentes aquosos contaminados por metais pesados 12,13 . Porém, o processo de reciclagem do material carbonizado é bastante oneroso 14 . Por outro lado, poucos pesquisadores têm se dedicado ao estudo de adsorbentes não carbonizados 15 .…”

Section: Introductionunclassified

Uso da casca de coco verde como adsorbente na remoção de metais tóxicos

Sousa¹,

Moreira²,

Oliveira³

et al. 2007

Quím. Nova

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Recebido em 20/6/06; aceito em 24/1/07; publicado na web em 24/7/07 THE USE OF GREEN COCONUT SHELLS AS ADSORBENTS IN THE REMOVAL OF TOXIC METALS. Green coconut shells were treated with acid, base and hydrogen peroxide solutions for 3, 6, 12 and 24 h for removing toxic metals from synthetic wastewater. The removal of ions by the adsorbent treated with 0.1 mol L -1 NaOH/ 3h was 99.5% for Pb 2+ and 97.9% for Cu 2+ . The removal of Cd 2+ , Ni 2+ , Zn 2+ , using adsorbent treated with 1.0 mol L -1 NaOH/3 h, was 98.5, 90.3 and 95.4%, respectively. Particle size, adsorbent concentration and adsorption kinetics were also studied. An adsorbent size of 60-99 mesh and a concentration of 30-40 g/L for 5 min exposure were satisfactory for maximum uptake of Pb 2+ , Ni 2+ , Cd 2+ , Zn 2+ and Cu 2+ and can be considered as promising parameters for treatment the aqueous effluents contaminated with toxic metals.Keywords : green coconut shells; toxic metals; wastewater. INTRODUÇÃOO Brasil é um dos maiores produtores mundiais de coco verde e a região Nordeste destaca-se pela produção e consumo, sendo responsável por 75% da produção nacional 1 . O país produziu uma quantidade de 1,9 bilhões de coco verde em 2004, ficando atrás da Índia, terceiro maior produtor mundial 2 . O agronegócio do produto no Brasil destaca-se principalmente pelo consumo do líquido do fruto in natura 3 , porém são conhecidas mais de 360 modalidades de aproveitamento industrial 1 . Entretanto, o agroresíduo do fruto imaturo do coco verde tem como um de seus principais problemas ambientais a geração de resíduos sólidos. Estima-se que cerca de 2 milhões de toneladas anuais de cascas são geradas em decorrência do consumo de água de coco verde no Brasil 2 .Atualmente têm sido realizados esforços para encontrar novas aplicações economicamente viáveis das cascas de coco verde. Neste contexto, a utilização das cascas de coco verde como adsorbente para tratar efluentes contaminados é um campo de atuação viável, devido à abundância e o baixo custo deste material 4,5 .A literatura relata a utilização de diversos materiais agroindustriais como potenciais adsorbentes na remoção de íons metálicos de águas residuais 6-11 . Entretanto, a maioria dos estudos investiga o processo de preparação de bioadsorbente carbonizado visando o emprego no tratamento de efluentes aquosos contaminados por metais pesados 12,13 . Porém, o processo de reciclagem do material carbonizado é bastante oneroso 14 . Por outro lado, poucos pesquisadores têm se dedicado ao estudo de adsorbentes não carbonizados 15 . Neste contexto, a utilização da casca de coco verde como adsorbente na remoção de metais tóxicos é uma alternativa barata e simples para minimizar os problemas de poluição urbana e ambiental gerados pela disposição destes resíduos, bem como diminuir os custos no tratamento de efluentes provenientes de pequenas indústrias.O objetivo deste trabalho foi investigar a eficiência de diversos tratamentos químicos dados à casca de coco verde, visando emprego no tratamento de efluentes aquosos contam...

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“…Mostly untreated and pretreated lignocellulosic industrial byproducts and agricultural residues have been employed as adsorbents for hexavalent chromium removal from water. These materials include sawdust (Baral et al 2006;Aliabadi et al 2006;Vinodhini and Das 2010), coir pith (Sumathi et al 2005), oil palm fiber (Isa et al 2008), wheat straw carbon (Chand et al 2009), barley straw carbon (Chand et al 2009), leaf mould (Sharma and Forster, 1996), wheat bran (Nameni et al, 2008;Singh et al 2009), cotton stalk peel , maize tassel (Zvinowanda et al 2009), walnut shell (Pehlivan and Altun 2008), walnut hull ), hazelnut shell (Pehlivan and Altun 2008), almond shell (Pehlivan and Altun 2008), rice bran (Oliveira et al 2005), rice husk (Sumathi et al 2005), soybean hulls (Marshall and Wartelle 2004), eucalyptus bark (Sarin and Pant 2006), Tamarindus indica seeds (Agarwal et al 2006), tea factory waste (Vinodhini and Das 2010), spent mushroom modified by cationic surfactant (Jing et al 2011), and olive stone (Blázquez et al 2009). Furthermore, since lignocellulosic materials are used in the bioethanol industry as source of sugars (Mosier et al 2005), the process solid residue can be, also, implemented as adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

Sidiras

Politi

Batzias

et al. 2013

Int. J. Environ. Sci. Technol.

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In this work, a low-cost lignocellulosic adsorbent with high biosorption capacity is proposed, suitable for the efficient removal of hexavalent chromium from water and wastewater media. The adsorbent was produced by autohydrolyzing Scots Pine (Pinus Sylvestris) sawdust. The effect of the autohydrolysis conditions, i.e., pretreatment time and temperature, on hexavalent chromium biosorption was investigated using energy-dispersive X-ray spectroscopy (EDS) and UV-visible spectrophotometry. The Freundlich, Langmuir, Sips, Radke-Prausnitz, Modified Radke-Prausnitz, Tóth, UNILAN, Temkin and DubininRadushkevich adsorption capacities and the rate constant values for pseudo-first-and pseudo-second-order kinetics indicated that the autohydrolyzed material exhibits significantly enhanced hexavalent chromium adsorption properties comparing with the untreated sawdust. The Freundlich's adsorption capacity K F increased from 2.276 to 8.928 (mg g -1 )(L mg -1 ) 1/n , and the amount of hexavalent chromium adsorbed at saturation (Langmuir constant q m ) increased from 87.4 to 345.9 mg g -1 , indicating that autohydrolysis treatment at 240°C for 50 min optimizes the adsorption behavior of the lignocellulosic material.

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Biosorption of aqueous chromium(VI) by Tamarindus indica seeds

Cited by 258 publications

References 26 publications

Hexavalent Chromium Removal by Citrus limonium Shell

Hexavalent Chromium Removal by Citrus limonium Shell

Uso da casca de coco verde como adsorbente na remoção de metais tóxicos

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

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