Cocoa shells for heavy metal removal from acidic solutions

Meunier, Nathalie; Laroulandie, Jérôme; Blais, Jean-François; Tyagi, Rajeshwar Dayal

doi:10.1016/s0960-8524(03)00129-9

Cited by 223 publications

(89 citation statements)

References 14 publications

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“…The sorption capacity of Indian WBAP for chromium (III) at pH 2.36 and 295 K was found to be 12.07 mg/g. The sorption capacity obtained for WBAP was found to be comparable to and in some cases better than the other sorbents and activated carbons as reported by Hasany and Ahmad (2006) for coconut husk (0.949 mg/g); Gode and Phelivan (2007) for b-DAEGsporopollenin resin (1.23 mg/gm) and CEPsporopollenin resin (133.33 mg/gm); Han et al (2006) for chlorella miniata (14.73 mg/g); Natale et al (2006) for char of South African coal (0.285 mg/g) and granular activated carbon (2.21 mg/g); Entezari et al (2005) for tire rubber (0.85 mg/g); Meunier et al (2003) for cocoa schells (2.52 mg/g); Bessiere et al (2002) for bentonite (4.29 mg/g) and perlite (1.4 mg/g) and Abollino et al (2002) for Na-montmorillonite (5.13 mg/g). The numerical value of mean sorption energy (E) from DKR isotherm in the present system was found to be 12.909 kJ/mol indicating the sorption process to be of ion exchange in nature.…”

Section: Modeling Of the Sorption Isothermsmentioning

confidence: 99%

Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material

Shah

Shah²,

Singh

2008

Int. J. Environ. Sci. Technol.

107

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Chromium (VI) which exists in many industrial wastewater is considered highly toxic. The aim of the present investigation was to study the reduction of chromium (VI) to chromium (III) and then removing it with the help of weathered basalt andesite products. Reduction of the chromium (VI) to chromium (III) by hydrazinium sulfate was investigated. The influence of hydronium ion concentration, contact time, hydrazinium sulphate dosage and temperature has been tested in batch runs. The process was found to be acid, temperature and concentration dependent. The suitability of weathered basalt andesite products as a potential sorbent was assessed for the removal of chromium (III) following batch mode of operation. The effect of various parameters such as hydronium ion concentration, shaking time, sorbent dose, initial metal ion concentration and temperature on the removal of chromium (III) from aqueous solution was studied. Thermodynamic parameters (∆H°, ∆S° and ∆G°) for the sorption process were evaluated. Analysis of sorption obtained results showed that the sorption pattern followed the Freundlich, Langmuir and Dubinin-KaganerRadushkevich isotherms. The process follows pseudo second order rate and surface diffusion is identified as the predominating mechanism. The sorption process was shown to be reversible by the recovery of sorbed chromium (III) upon extraction with 0.5 M nitric acid. The sorbent, before and after sorption, was characterized by fourier transform infrared spectrometer, X-ray diffraction, scanning electron microscope, transmision electron microscope and thermogravimetric analyse methodes. An increase in crystallanity after sorption of chromium was observed. An industrial effluent was successfully treated with the same sorbent with convincing results.

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Section: Modeling Of the Sorption Isothermsmentioning

confidence: 99%

Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material

Shah

Shah²,

Singh

2008

Int. J. Environ. Sci. Technol.

107

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“…These include mungbean husk [5], hazelnut shell [6], almond shell [6], pine [7], lignin [8], tea leaves [9], tree ferm [10], groundnut husks [11], sphagnum moss peat [12], sawdust [13], rice hulls [14], chitosan [14], sugarcane bagasse [15], cocoa shell [16], and rice husk [17]. However, some major limitations of these biosorptions are that some of them have not yielded satisfactory results (high metal adsorption capacity) and others that yielded good results may not locally be available.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Olu-Owolabi

Diagboya

Ebaddan

2012

Chemical Engineering Journal

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. a b s t r a c tBiosorption of lead (II) ions onto raw biomass of the moss plant Barbula lambarenensis has been studied using the batch equilibrium adsorption method. Equilibrium isotherms, kinetics and thermodynamic parameters have been evaluated. The FT-IR analysis showed that likely functional groups responsible for the adsorption are carboxyl, carbonyl, amides and hydroxyl groups. The pH for optimum adsorption is 5.0. Equilibrium data fit well to the Langmuir isotherm. The estimated maximum adsorption capacity was found to be 62.50 mg/g at 298 K and 90.91 mg/g at 323 K. The kinetic data obeyed the pseudo-second-order model. The free energy changes (DG o ) are positive and the reaction is exothermic with decreased randomness at the sorbent/solution interface. Taking into account its good adsorption capacity, ease of sample treatment, as well as availability, the biomass of B. lambarenensis is a promising cost-effective biosorbent for Pb 2+ removal from aqueous environment.

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“…It is used in mining, smelting, refining, battery manufacturing, soldering, electrical wiring, home demolition and construction, painting, ceramic glazing, and the making of stained glass. The increasing presence of lead is very problematic to surface water and underground water due to their mobility and great toxicity (Meunier et al, 2003;Yan and Viraraghavan, 2003). The heavy metal lead is among the most common pollutant found in industrial effluents.…”

mentioning

confidence: 99%

Ion Flotation of Copper(II) and Lead(II) from Environmental Water Samples

Ghazy¹,

El-Morsy²,

Ragab³

2010

Journal of Applied Sciences and Environmental Management

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ABSTRACT:The present study aims to develop a simple, rapid and economic procedure for copper(II) and lead(II) removal under the optimum conditions investigated. It is based on the complex formation between Cu 2+ and Pb 2+ ions and diphenylcarbazone (HDPC) followed by flotation with oleic acid (HOL) surfactant. The different parameters (namely: solution pH, HDPC, HOL, copper and lead concentrations, ionic strength, temperature and the presence of foreign ions) influencing the flotation process were examined. Nearly, 100% of Cu 2+ and Pb 2+ ions were removed from aqueous solutions at pHs 6 and 7, respectively at room temperature (~25 o

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Cocoa shells for heavy metal removal from acidic solutions

Cited by 223 publications

References 14 publications

Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material

Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Ion Flotation of Copper(II) and Lead(II) from Environmental Water Samples

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