Determination of the optimal conditions for the adsorption of cadmium ions and phenol on chestnut(Castanea sativa) shell

Vazques, G.; Golzalez-Alvarez, J.; Freire, M. Sonia; Calvo, M.; Antorrena, G.

doi:10.30955/gnj.000587

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…In addition, K a values did not differ remarkably which means that there are not substantial changes between the binding capacity of the dyes with the bark surface. In fact, the value of the separation factor, R L (Equation 10), a characteristic of this isotherm (Vázquez et al 2009), indicated a favorable adsorption for both dyes for all initial concentration essayed (0 < R L < 1):…”

Section: Equilibrium Studies For Single Systemsmentioning

confidence: 97%

Biosorption of methylene blue and malachite green from single and binary solutions by Pinus pinaster bark

Litefti,

Freire,

Stitou

et al. 2023

Maderas-Cienc Tecnol

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Aiming to develop a sustainable separation process reducing the water pollution, in this work Pinus pinaster (cluster pine) bark from a wood veneer industry was used for methylene blue and malachite green removal from aqueous systems. For single adsorption, the influence of time (up 8 h), adsorbent dose (2,5 - 5 - 10 g·L-1), temperature (25 ºC - 40 ºC - 60 ºC), pH (2 - 4 - 6) and particle size (0,1 mm - 0,5 mm, 0,5 mm - 1 mm and 1,6 mm - 2 mm) on adsorption was investigated. To study the initial concentration effect on binary adsorption, different concentrations (0 - 5 - 25 - 50 mg·L-1) were used at 25 ºC, natural pH and a dose of 5 g·L-1. High efficiency was obtained at pH = 4 (natural pH), dose of 5 g·L-1 and particle size of 0,5 - 1 mm. Adsorption percentages higher than 70 % were reached in less than one hour, with removal almost complete at equilibrium in single systems, without temperature influence. Methylene blue was slightly better adsorbed by bark. In binary systems, dyes exhibited competitive adsorption, decreasing their removal, especially increasing the initial concentration of the other dye. Dyes adsorption followed the pseudo-second order kinetic model, whereas the Langmuir isotherm explained adsorption equilibria in mono-component systems. High adsorption capacities (41,7 mg·g-1 for malachite green and 50,0 mg·g-1 for methylene blue) were obtained at 40 ºC and natural pH indicating that pine bark can be effectively used as biosorbent.

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Section: Equilibrium Studies For Single Systemsmentioning

confidence: 97%

Biosorption of methylene blue and malachite green from single and binary solutions by Pinus pinaster bark

Litefti,

Freire,

Stitou

et al. 2023

Maderas-Cienc Tecnol

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Removal of cadmium (Cd-II) from aqueous solution using gas industry-based adsorbent

Kumar

2019

SN Appl. Sci.

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The present study is to determine the potential of gas industry sludge as a low-cost adsorbent for the removal of cadmium from aqueous solution. The batch experiments were conducted to optimize pH, contact time, adsorbent dose and initial metal ion concentration. The experiments were optimized at pH 5, contact time 60 min and an adsorbent dose of 0.75 g/100 ml with constant agitation at the room temperature. The result of batch experiment was further discussed for the removal of cadmium from adsorbent. The adsorption data were correlated with Freundlich and Langmuir isotherms to know the interaction of sludge adsorbent with cadmium. High value of regression coefficient (R 2 > 0.95) indicated that the adsorption data are fitted well with both Langmuir and Freundlich isotherms. The adsorption capacity of 25 mg/g was found to be quite good for removal of the cadmium from aqueous solution. Desorption efficiency showed highest removal with HCl (42.83%); followed by HNO 3 (38.26%), EDTA (37.73%) and H 2 SO 4 (36.83%). The removal and desorption efficiency of the gas industry-based adsorbent was found to be comparable and even more suitable than the chemically modified adsorbents. The present study provides a low-cost and environmentally friendly adsorbent, which can be used as an alternative for the treatment of wastewater.

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Influence of pre-treatment methods on the adsorption of cadmium ions by chestnut shell

Vázquez

Mosquera

Freire

et al. 2010

WIT Transactions on Ecology and the Environment

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In this work the use of chestnut shell as an adsorbent of the cadmium ions present in some industrial wastewaters was studied. Various pre-treatments were performed to increase the sorption capacity of the material and simultaneously avoid the coloration of the water due to soluble polyphenols. The effect of the pre-treatments was evaluated using the pre-treated material to adsorb Cd 2+ ions under specified conditions. The influence of the pre-treatment agent (water, sodium hydroxide, sulphuric acid, formaldehyde and sodium chloride) and of the operating conditions (temperature and time) on the sorption capacity of the pre-treated material was analysed using the pseudo-second order kinetic model. Equilibrium sorption capacities from 2.50 to 7.11 mg Cd 2+ /g oven-dried shell were achieved. The optimal results were obtained by pre-treating the shell with a 4% NaOH aqueous solution for 24 h at room temperature. Under these conditions an adsorption percentage of 98.6% was obtained and 80% of the maximum sorption capacity was reached in less than 1 h. X-ray photoelectron spectrometry (XPS) surface measurements were performed to compare the chemical composition of the pre-treated materials. Additionally, FTIR and XPS were used to analyze the functional groups involved in Cd binding.

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Determination of the optimal conditions for the adsorption of cadmium ions and phenol on chestnut(Castanea sativa) shell

Cited by 4 publications

References 23 publications

Biosorption of methylene blue and malachite green from single and binary solutions by Pinus pinaster bark

Biosorption of methylene blue and malachite green from single and binary solutions by Pinus pinaster bark

Removal of cadmium (Cd-II) from aqueous solution using gas industry-based adsorbent

Influence of pre-treatment methods on the adsorption of cadmium ions by chestnut shell

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