A comparative study of the mass transfer kinetics of metal biosorption by microbial biomass

Puranik, Pravin R.; Modak, Jayant M.; Paknikar, Kishore M.

doi:10.1016/s0304-386x(99)00017-1

Cited by 120 publications

(64 citation statements)

References 7 publications

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“…This indicates that the smaller particle size have higher surface area and mass transfer coefficient, and hence, lower external mass transfer resistance. However, the values of a K L were in the same magnitude to that reported (0.03 to 0.1 min -1 ) by Puranik et al (1999). In addition, nickel uptake was higher at pH values of 6 and 7, and indicates that at the higher pH AWBS possesses more anionic charge and favors higher adsorption uptake.…”

Section: Mass Transfer Modelingsupporting

confidence: 67%

“…Mass transfer modeling has been performed based on the assumption that the external mass transfer is the rate limiting step for the nickel ion and AWBS system (Loukidou et al 2004;Koumanova et al 2002;Puranik et al 1999). In this work, the volumetric mass transfer (Table 5.3) when the AWBS particles were decreased from 1.18-3.35 mm to less than 0.425 mm; the a K L was the same magnitude as that reported (0.03 to 0.1 min -1 ) by Puranik et al (1999). This indicates that the smaller particle size have higher surface area and mass transfer coefficient, and hence, lower external mass transfer resistance.…”

Section: Mass Transfer Modelingmentioning

confidence: 99%

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Biosorption of nickel with barley straw

Thevannan

Mungroo

Niu

2010

Bioresource Technology

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Nickel contaminated wastewater from plating industries is a major environmental concern. Current treatment methods are often expensive and can also create additional problems. Biosorption is an alternative treatment method that uses inexpensive biomaterials to sequester metals from aqueous solutions. In this study, acid washed barley straw (AWBS) was used for adsorbing nickel ions (Ni 2+ ) from simulated nickel plating wastewater. The adsorption process was rapid and the equilibrium was reached in about anhour. An increase in the initial nickel concentration increased the equilibrium nickel uptake, and the maximum uptake was found to be 8.45 mg/g of AWBS when the initial nickel concentration was1000 mg/L at pH 5. Nickel adsorption was favorable at room temperature than 5 o C and 40 o C, better adsorption rate and equilibrium uptake was observed at 23 o C. Increasing the pH from 3 to 7 increased the equilibrium nickel uptake and the maximum uptake was observed at pH 7, whilst the initial nickel ion concentration was 100 mg/L. The Freundlich isotherm model exhibited better fit with the equilibrium data than the Langmuir equation. Nickel was desorbed using hydrochloric acid solution at pH 2 and the desorption efficiency was 86%. LIST OF TABLES

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Section: Mass Transfer Modelingsupporting

confidence: 67%

Section: Mass Transfer Modelingmentioning

confidence: 99%

Biosorption of nickel with barley straw

Thevannan

Mungroo

Niu

2010

Bioresource Technology

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“…Table 1, it can be observed that the External Film Model describes better the system based on its higher regression coefficient. This model considers that the limiting step is the diffusion from the solution to a tiny liquid film formed on the adsorbent particle (Puranik et al, 1999). It may indicate that the operating parameters such as agitation speed could have important effects on the adsorption efficiency.…”

Section: Kinetic Studiesmentioning

confidence: 99%

Adsorption of Copper in Expanded Vermiculite: Kinetics and Equilibrium

Nishikawa¹,

Neto²,

Vieira³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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-The aim of this work was to evaluate copper adsorption on expanded vermiculite through kinetic and equilibrium studies. The kinetics of adsorption of copper into vermiculite was assessed by kinetic phenomenological models of pseudofirst order, pseudo-second-order and intra-particle diffusion models as well as a mass transfer model in the external film. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were fitted to equilibrium data. The adsorption process follows kinetic External Film Mass Transfer and Intraparticle Diffusion models, and Freundlich model describes better the system in the equilibrium. It was also verified that the process is spontaneous, endothermic and favorable. D-R model indicated that the adsorption of copper on vermiculite is a physical process.

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“…[5][6][7] Entretanto, a remoção de íons metálicos presentes em baixas concentrações, bem como de outras substâncias poluentes, como corantes industriais e agrotóxicos, demanda o desenvolvimento de novos materiais e processos, com destaque para o emprego de materiais absorventes de baixo custo, principalmente aqueles presentes na biomassa. [6][7][8][9] A desacetilação de quitina, um polissacarídeo que ocorre abundantemente na natureza e que é extraído comercialmente de rejeitos da indústria pesqueira, tais como carapaças de caranguejos e cascas de camarões, resulta em quitosana, um polímero que possui boas propriedades de adsorção de íons metálicos devido às interações que estes estabelecem com grupos amino, presentes em grande número nas cadeias de quitosana.10 O uso de quitosana também tem sido sugerido para a adsorção de corantes 11 e de ácidos húmicos, 12 na separação de metais pesados, 13-16 na descontaminação de efluentes contendo Escherichia coli e pesticidas, 17,18 entre outras aplicações. No caso da interação com cátions, a elevada capacidade de adsorção da quitosana é devida à formação de complexos entre os cátions e o…”

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Estudo das interações entre o complexo polieletrolítico trimetilquitosana/carboximetilcelulose e Cu+2, ácido húmico e atrazina em solução aquosa

Filho¹,

Britto²

2009

Quím. Nova

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Recebido em 3/7/08; aceito em 4/2/09; publicado na web em 3/7/09 STUDY OF THE INTERACTIONS BETWEEN THE POLYELECTROLYTE COMPLEX TRIMETHYLCHITOSAN/ CARBOXYMETHYLCELLULOSE AND Cu +2, HUMIC ACID AND ATRAZINE IN AQUEOUS SOLUTION. The polyelectrolyte complex (PEC) resulting from the reaction of sodium carboxymethylcellulose (CMC) and N,N,N-trimethylchitosan hydrochloride (TMQ) was prepared and then characterized by infrared spectroscopy and energy dispersive X rays analysis. The interactions involving the PEC and Cu 2+ ions, humic acid and atrazine in aqueous medium were studied. From the adsorption isotherms the maximum amount adsorbed (X max ) was determined as 61 mg Cu 2+ /g PEC, 171 mg humic acid/g PEC and 5 mg atrazine/g PEC. The results show that the CMC/TMQ complex has a high affinity for the studied species, indicating its potential application to remove them from aqueous media.Keywords: N,N,N-trimethylchitosan; carboxymethylcellulose; polyelectrolyte complex. INTRODUÇÃOAs reservas de água doce correspondem a apenas 0,8% do total existente no planeta (aproximadamente 1,36x10 18 m 3 ), e somente 3% destas reservas são águas superficiais, mais facilmente disponíveis para a exploração visando o abastecimento público.1 A distribuição destas reservas está muito distante de ser minimamente uniforme e sua concentração em umas poucas regiões do globo estabelece, e também acentua, grandes desigualdades e desequilíbrios em nível mundial. De fato, a água é considerada por muitos analistas como o mais importante bem material da humanidade no século XXI. Apesar de dispor de reservas limitadas de água, a civilização contemporânea não aplica critérios suficientemente restritivos e reguladores para o seu uso. Isto resulta, por um lado, em desperdício e facilita, por outro lado, a contaminação e a poluição de enormes volumes de água. A interferência do homem, gerando despejos domésticos e industriais, ocupando e usando o solo para atividades extrativistas, agrícolas e de mineração, é particularmente importante, pois contribui para a introdução de substâncias estranhas, e por vezes de elevada toxicidade, nos mananciais de água, comprometendo significativamente a sua qualidade, limitando e até impedindo a sua utilização. Os principais poluentes presentes na água, gerados pela interferência das atividades humanas, são os sólidos em suspensão, a matéria orgânica biodegradável, os nutrientes e organismos patogênicos provenientes, principalmente, do esgoto doméstico, a matéria orgânica lentamente biodegradável ou relativamente refratária à biodegradação, na forma de agrotóxicos, como herbicidas, inseticidas e pesticidas, e detergentes, os compostos inorgânicos hidrossolúveis e íons de metais pesados.O descarte de efluentes industriais contendo íons metálicos, especialmente aqueles dos denominados metais pesados, constitui grave ameaça a uma grande variedade de seres vivos, incluindo o homem, pois estes poluentes não são biodegradáveis, se acumulam nos tecidos vivos e têm, assim, a sua concentração aumentada ao longo da cadeia alime...

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A comparative study of the mass transfer kinetics of metal biosorption by microbial biomass

Cited by 120 publications

References 7 publications

Biosorption of nickel with barley straw

Biosorption of nickel with barley straw

Adsorption of Copper in Expanded Vermiculite: Kinetics and Equilibrium

Estudo das interações entre o complexo polieletrolítico trimetilquitosana/carboximetilcelulose e Cu+2, ácido húmico e atrazina em solução aquosa

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