Equilibrium studies for the sorption of chromium and nickel from aqueous solutions using raw rice bran

Oliveira, E.A.; Montanher, Silvana Fernandes; Andrade, A.D.; Nóbrega, J.A.; Rollemberg, M.C.

doi:10.1016/j.procbio.2005.02.026

Cited by 221 publications

(80 citation statements)

References 24 publications

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“…3 The use of alternative materials in retaining or removing pollutants from aqueous systems has been studied to lower the expenses of materials and to reduce the treatment of some wastes and contaminated solutions. 4 Activities such as electroplating and industries that process materials such as leather, cement, steel, and fertilizer are responsible for releasing toxic heavy metals that can cause severe damages to human health and the environment. 5 One such pollutant, chromium, and its compounds persist in the environment in oxidization states of Cr 3 + and the more toxic Cr 6+ .…”

Section: Introductionmentioning

confidence: 99%

Biosorption and removal of chromium from water by using moringa seed cake (Moringa oleifera Lam.)

et al. 2013

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Recebido em 14/11/12; aceito em 13/5/13; publicado na web em 17/7/13 This study evaluated the adsorption capacity of chromium from contaminated aqueous solutions by using Moringa oleifera Lam. seeds. Parameters such as solution pH, adsorbent mass, contact time between solution and adsorbent, isotherms, thermodynamic, kinetics, and desorption were evaluated. The maximum adsorption capacity (Q m ) calculated to be 3.191 mg g −1 for the biosorbent. Activated carbon was used for comparison purposes in addition to the biosorbent. The best fit was obtained by the Langmuir model for both adsorbents. The average desorption value indicated that both the biosorbent and activated carbon have a strong interaction with the metal. The results showed that the biosorbent has advantages owing to its low cost and efficiency in Cr 3+ removal from contaminated waters.

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Section: Introductionmentioning

confidence: 99%

Biosorption and removal of chromium from water by using moringa seed cake (Moringa oleifera Lam.)

et al. 2013

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“…The chemical activity of these species, with adjacent hydroxyl groups, contributes to the capture of cations, enabling to form chelates. The formation of complex compounds can also occur with the carbonyl or hydroxyl compound polyphenols (Oliveira et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

Chemical characterization of agroforestry solid residues aiming its utilization as adsorbents for metals in water

Luzardo¹,

Velasco²,

Alves³

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TIn this work, a study of the correlation between the functional groups present in the chemical structure of the fibers of coconut shells, cocoa and eucalyptus, and their adsorption capacity of Cd +2 and Cu +2 ions from water was performed. The content of soluble solids and reactive phenols in aqueous extracts were determined. The chemical functional groups present in the fibers were examined using the IR spectra. The adsorption capacity of the peels was determined using atomic absorption spectrophotometer. For Cd +2 , a significant correlation between the adsorption capacity and some specific chemical functional groups present in the fiber was verified. The potential use of these peels, as adsorbent of Cd +2 ions, is based on the presence of OH functional groups such as aryl-OH, aryl-O-CH 2 of phenol carboxylic acids, as well as carbonyl groups derived from carboxylic acid salts, in these fibers.Caracterização química de resíduos sólidos agroflorestais visando à sua utilização como adsorventes de metais em água R E S U M O Neste trabalho foi realizado um estudo da correlação entre os grupos funcionais presentes na estrutura química das fibras de casca de coco, cacau e de eucalipto e sua capacidade de adsorção de íons de Cd +2 e Cu +2 da água. Foram determinados o teor de sólidos solúveis e fenois reativos em extratos aquosos. Os grupos químicos funcionais presentes nas fibras foram analisados utilizando-se os espectros de IV. A capacidade de adsorção das cascas foi determinada através de um espectrofotômetro de absorção atômica. Para os íons de Cd +2 foi encontrada uma correlação significativa entre a capacidade de adsorção e alguns grupos funcionais químicos presentes na fibra. O uso potencial dessas cascas, como adsorvente de íons de Cd +2 , se baseia na presença de grupos funcionais arilo-OH, arilo-O-CH 2 de ácidos carboxílicos fenois, tais como grupos carbonila derivados a partir de sais de ácidos carboxílicos, nessas fibras.

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“…The initial and final concentration of phenol was analyzed on UV-Vis spectrophotometer-Perkin Elmer Lambda 25" at λ max 660 nm. The amount of adsorption at equilibrium (Q e mg/g) and sorption efficiency (%) were calculated according to the expressions; Where C o and C e are the initial and equilibrium concentration (mg/L), V the volume of solution (L), m the weight of almond shells activated carbon (g) and C is the solution concentration at the end of the sorption process (mg/L) 15 . Figure 1 shows the B.E.T isotherms obtained for phenol adsorption on ASAC and F-400 that illustrate the synthesis of microporous structures with a good surface area and micropore volume.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Characterization of Activated Carbon Prepared from Almond Shells for Scavenging Phenolic Pollutants

2013

Chem Sci Trans

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Abstract:The present work comprises study of almond shell activated carbon (ASAC) impregnated by H 3 PO 4 used as adsorbent. The objective of this work was to determine the ability of activated carbon in phenol removal. The activated carbon in the study was of size +1 to -4.75 mm. ASAC is found to be inexpensive and effective adsorbent for removal of phenol from aqueous solution. Prepared activated carbon was characterized by determining Iodine number and methylene blue number to examine the extent and nature of porosity. The higher methylene blue number demonstrates that fairly mesoporous carbon has been developed by the process which can facilitate its applicability as potential dye removal adsorbent. N 2 BET surface area has been found to be quite comparable to commercially available carbon. The FTIR results strongly support significant spectral and chemical changes occurring with the activation of the almond shells for phosphoric acid treatment. The physical morphology clearly shows that the data obtained is consistent to the structural surface as determined by analyzing the SEM micrographs.

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Equilibrium studies for the sorption of chromium and nickel from aqueous solutions using raw rice bran

Cited by 221 publications

References 24 publications

Biosorption and removal of chromium from water by using moringa seed cake (Moringa oleifera Lam.)

Biosorption and removal of chromium from water by using moringa seed cake (Moringa oleifera Lam.)

Chemical characterization of agroforestry solid residues aiming its utilization as adsorbents for metals in water

Characterization of Activated Carbon Prepared from Almond Shells for Scavenging Phenolic Pollutants

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