Removal of Malachite Green from aqueous solution using degreased coffee bean

Baek, Mi-Hwa; Ijagbemi, Christianah Olakitan; Se-Jin, O; Kim, Dong–Su

doi:10.1016/j.jhazmat.2009.11.110

Cited by 333 publications

(141 citation statements)

References 43 publications

(52 reference statements)

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“…33 The Gibbs free energy change (ΔG°) was calculated from equations (3) and (4), while the change of enthalpy (ΔH°) and enthropy (ΔS°) were obtained using Van't Hoff equation (5):…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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The adsorption of malachite green (MG) from aqueous solution by waste green tea (WGT) biomass was investigated. A series of experiments in batch conditions were conducted in order to assess the MG removal on WGT, following adsorbent quantity and temperature influences. Maximum removal efficiency for untreated WGT was 89% (4 g biomass, 100 mL solution of 94 mg/L, 316 K). It was found that the adsorption of MG increased by increasing temperature from 296 to 316 K. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) were calculated, and indicated that dye adsorption onto the studied biomass was endothermic and non-spontaneous. Six chemical treatments were tested (four acidic -H 3 PO 4 , H 2 SO 4 , HCl, and tartaric acid, one oxidant -H 2 O 2 , and one basic -NaOH) in order to study the chemical groups responsible for MG adsorption onto WGT biomass. The alkali and acidic treatments led to an increase of adsorption efficiency up to 92% and 95% (H 2 SO 4 ) respectively. The FTIR spectroscopy results emphasized the modifications of the biomass surface and how these are influencing the adsorption process.

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“…33 The Gibbs free energy change (ΔG°) was calculated from equations (3) and (4), while the change of enthalpy (ΔH°) and enthropy (ΔS°) were obtained using Van't Hoff equation (5):…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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“…Furthermore, the equilibrium adsorption capacity increased with increase in initial dye concentration (figure not shown). This is attributed to the fact that increasing dye concentration increases the driving force to overcome all mass transfer resistances of the CV and CR between the aqueous and solid phase, leading to an increase in equilibrium adsorption capacity [19,20]. …”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Adsorption of Basic and Acidic Dyes onto Agricultural Wastes

Okorocha

Okoji

Osuji

2016

ILCPA

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Abstract. The potential of almond leaves powder, (ALP) for the removal of Crystal violet (CV) and Congo red (CR) dyes from aqueous solution was investigated. The adsorbent (ALP) was characterized by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dyes adsorption process. The optimum conditions for the adsorption of CV and CR dyes onto the adsorbent (ALP) were found to be: contact time (100mins), pH (10.0), temperature (343K) for an initial CV dye concentration of 50 mg/L using adsorbent dose of 1.0 g and contact time (100mins), pH (2.0), temperature (333K) for an initial CR dye concentration of 50 mg/L using adsorbent dose 1.0 g respectively. The experimental equilibrium adsorption data fitted best and well to the Freundlich isotherm model for both CV and CR dyes adsorption. The maximum adsorption capacity of ALP was found to be 22.96 mg/g and 7.77 mg/g for the adsorption of CV and CR dyes respectively. The kinetic data conformed to the pseudosecond-order kinetic model. Thermodynamic quantities such as Gibbs free energy (G 0 ), enthalpy (H 0 ) and entropy (S 0 ) were evaluated and the negative values of G 0 obtained for both dyes indicate the spontaneous nature of the adsorption process while the positive values of H 0 and S 0 obtained indicated the endothermic nature of the adsorption and increased randomness during the adsorption process respectively for the adsorption of CV and CR onto ALP. Based on the results obtained such as good adsorption capacity, rapid kinetics, and its low cost, ALP appears to be a promising adsorbent material for the removal of CV and CR dye stuff from aqueous media.

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“…But it is costly, and therefore, it is very important to develop an alternative low-cost adsorbent. A variety of low-cost adsorbents are clay materials, zeolites, siliceous materials, coffee husk-based activated carbon, decreased coffee bean, marine algae, chitosan and ion exchange resin have been used for the removal of dyes from aqueous solution (Kyzas 2012;Ahmad and Rahman 2011;Baek et al 2010). In the present study, eggshell powder is used as an adsorbent for the removal of dyes from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Calcined eggshell as a cost effective material for removal of dyes from aqueous solution

Borhade¹,

Kale²

2017

Appl Water Sci

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The removal of Rhodamine B, Eriochrome black T and Murexide dyes from aqueous solutions using calcined eggshell powder were investigated. In this study, calcined eggshell powder was applied for its potential use as an adsorbent for the removal of Rhodamine B, Eriochrome black T and Murexide dyes from their aqueous solutions. The calcined eggshell powder obtained was characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The various parameters such as initial concentration, pH, adsorbent dose and contact time were studied. Various isotherms including Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were applied for the equilibrium adsorption data. The kinetic study of Rhodamine B, Eriochrome black T and Murexide dyes on calcined eggshell powder follows pseudo-second order kinetics.

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Removal of Malachite Green from aqueous solution using degreased coffee bean

Cited by 333 publications

References 43 publications

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Adsorption of Basic and Acidic Dyes onto Agricultural Wastes

Calcined eggshell as a cost effective material for removal of dyes from aqueous solution

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