Adsorption kinetics of chromium(III) ions on agro-waste materials

García-Reyes, Refugio Bernardo; Rangel-Mendez, J. Rene

doi:10.1016/j.biortech.2010.06.020

Cited by 92 publications

(28 citation statements)

References 35 publications

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“…The uptake rate of the adsorbate can be supposed to be linearly proportional to the driving force, defined as the difference between the liquid bulk and the particle surface concentrations as follows [28,35]:…”

Section: Film Diffusion Modelmentioning

confidence: 99%

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Adsorption kinetics of nitrate ions on ion exchange resin

et al. 2013

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Section: Film Diffusion Modelmentioning

confidence: 99%

“…The model equation (Eq. (14)) was obtained by applying differential mass balance inside the resin particles [26,28,30,31,[35][36][37]. Moreover, the resin particles were assumed to be spherical.…”

Section: Particle Diffusion Modelmentioning

confidence: 99%

Adsorption kinetics of nitrate ions on ion exchange resin

et al. 2013

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“…Among these treatments, biosorption can be considered as an eco-friendly and economical wastewater treatment that has been proven to be highly efficient to remove low metal concentration, and in addition, the biosorbent can be easily regenerated (Chojnacka 2010). Several biosorbents have been tested such as algae, bacteria, fungi, yeast, and agro-waste materials (Romera et al 2006;Ahluwalia and Goyal 2007;Kumar et al 2007;Kumar et al 2008;Sud et al 2008;Basha et al 2009;Garcia-Reyes and Rangel-Mendez 2010;Cerino-Córdova et al 2011a, b). Agro-waste materials can be considered as alternative adsorbents due to their low cost and physicochemical properties (Naiya et al 2009b), besides these materials are widely available as byproducts from industrial processes such as beverage, wood, and food industries, among others.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Cu(II) and Pb(II) from aqueous solutions by chemically modified spent coffee grains

Cerino-Córdova

Diaz‐Flores

García-Reyes

et al. 2013

Int. J. Environ. Sci. Technol.

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In this research, spent coffee grains were modified with citric acid solutions (0.1 and 0.6 M) to increase the quantity of carboxylic groups improving its metal adsorption capacity. Added functional groups on modified and non-modified spent coffee grains were identified and quantified by attenuated total reflection Fourier transform infrared analyses and potentiometric titrations, respectively. These adsorbents were used for the removal of lead (II) and copper (II) from aqueous solutions at 30°C and different pH in batch systems. In addition, adsorptiondesorption experiments were conducted to evaluate the possibility of re-using the modified adsorbent. Potentiometric titrations data reveal that the quantity of carboxylic groups was increased from 0.47 to 2.2 mmol/g when spent coffee grains were modified with 0.1 and 0.6 M citric acid. Spent coffee grains treated with 0.6 M citric acid, achieved a maximum adsorption capacity of 0.77 and 1.53 mmol/g for lead (II) and copper (II), respectively, whereas nonmodified spent coffee grains only reached 0.24 and 0.19 mmol/g for lead (II) and copper (II), respectively. Desorption of lead (II) and copper (II) achieved around 70 % using 0.1 N HCl for non-modified and modified spent coffee grains with 0.6 M citric acid. It is suggested that lead (II) and copper (II) species were adsorbed mainly on the carboxylic groups of modified spent coffee grains and these metals may be exchanged for hydrogen and calcium (II) ions during adsorption on non-modified spent coffee grains. Finally, the adsorption equilibrium was reached after 400 min for modified spent coffee grains with 0.6 M citric acid. Modified spent coffee grains are a promising option for removing metal cations from aqueous solutions due to its low cost and high adsorption capacity (about 10 times higher than the activated carbons).

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“…Heavy metals occur as contaminants of liquid waste discharged from various industries such as electroplating, tanneries, textiles, radiator manufacturing, chloralkali, oil refineries, mining and smelting (Kula et al, 2008;Garcia-Reyes et al, 2010;Kantali and Yanik, 2010). The most common toxic metals found in industrial wastewater are chromium, nickel, manganese, mercury, cadmium, lead, copper and zinc (Kazemipour et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of heavy metals by agroforestry waste derived activated carbons applied to aqueous solutions

Misihairabgwi¹,

Kasiyamhuru²,

Anderson³

et al. 2014

Afr. J. Biotechnol.

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Activated carbons prepared from macadamia nut shells, baobab shells, pigeon pea husks, rice husks, Moringa oleifera husks, and marula stones were investigated for their abilities to adsorb Pb(II), Zn(II), Cu(II), Ni(II), Fe(II), Mn(II), Hg(II), Cr(III), As(III) and Cd(II) from aqueous solutions. Batch adsorption experiments were conducted at pH values of 4, 5 and 6. Metal ion adsorption generally increased as the pH was increased from 4 to 6. Percentage adsorption values were above 60% for adsorption of Hg(II) by all the activated carbons at pH 6. The adsorption of Pb(II) by carbons from Baobab shells, pigeon pea husks, Moringa oleifera husks and Marula stones was at least 22% higher than that of the commercial carbons used for comparison. Carbons derived from pigeon pea husks and baobab shells showed better metal ion adsorption compared to the other carbons and were used to determine the effects of initial metal concentration, contact time and adsorbent quantity on metal adsorption. The metal ion adsorption data fitted the Langmuir adsorption model.

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Adsorption kinetics of chromium(III) ions on agro-waste materials

Cited by 92 publications

References 35 publications

Adsorption kinetics of nitrate ions on ion exchange resin

Adsorption kinetics of nitrate ions on ion exchange resin

Biosorption of Cu(II) and Pb(II) from aqueous solutions by chemically modified spent coffee grains

Adsorption of heavy metals by agroforestry waste derived activated carbons applied to aqueous solutions

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