Removal of chromium(VI) from wastewater by activated carbon developed from Tamarind wood activated with zinc chloride

Acharya, Jyotikusum; Sahu, J.N.; Sahoo, B.; Mohanty, Chitta Ranjan; Meikap, B.C.

doi:10.1016/j.cej.2008.11.035

Cited by 341 publications

(165 citation statements)

References 28 publications

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“…In the adsorption technique the major concern is the selection of adsorbent material. In the last few years there has been an emphasis to develop waste materials as potential scavengers for the removal of different types of pollutants from water and waste materials such as baker's yeast [18], tamarind wood [19], agricultural waste biomass [20], gypsum [21], and sludge [22,23] have been employed. A significant contribution in the removal of toxic dyes from the wastewater has also been made from our laboratories [24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Mittal

Malviya

et al. 2009

Journal of Colloid and Interface Science

654

210

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a b s t r a c tThe present investigation assesses the applicability of waste materials-bottom ash and deoiled soya-for the removal of the colorant Congo red from wastewaters. The adsorption characteristics and dye removal efficiency of adsorbents have been determined by investigating factors such as effect of pH, effect of concentration of the dye, amount of adsorbents, contact time, and temperature. Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich isotherm models have been used to evaluate the ongoing adsorption. With the help of adsorption isotherm data different thermodynamic parameters such as free energy; enthalpy, and entropy have been calculated. The estimated free energy has been obtained as À21.52 kJ mol À1 for bottom ash and À16.88 kJ mol À1 for deoiled soya. On the basis of pseudo-first-order and pseudo-second-order kinetic equations different kinetic parameters have been obtained. Column operations depicted good adsorptive tendencies for Congo red with 96.95% and 97.14% saturation of dye on bottom ash and deoiled soya, respectively. Regeneration of the saturated columns has been made by eluting NaOH solution and more than 90% dye has been recovered in both cases.

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Section: Introductionmentioning

confidence: 99%

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Mittal

Malviya

et al. 2009

Journal of Colloid and Interface Science

654

210

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“…Woda ta posiadała bardzo dużą ilość związków mineralnych (1837 mg/dm 3 , podczas gdy woda G -592 mg/dm 3 ), ale również znacznie niższe pH (6,2, podczas gdy pozostałe wody miały pH w granicach 7,4÷7,8). W przypadku adsorpcji anionów, w tym chromu(VI), stwierdzono zależność, że im niższe pH, tym wyższa skuteczność adsorpcji [18,19]. Wiąże się to m.in.…”

Section: Wyniki Badańunclassified

Chromium Adsorption from Waters of Different Chemical Composition

Lach

2016

Eng. Prot. Environ.

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The effectiveness of the Cr(VI) anions or Cr(III) cations adsorption depends, among others, on the chemical composition of the solution. The study analyzed the impact of the composition of 8 natural waters (spring, low-, medium-, and highly mineralised) on the effectiveness of the adsorption of Cr(VI) and Cr(III) on WG-12 carbon. The adsorption capacity of carbon against the hexavalent chromium from a single-component solution of 1 mg/dm 3 concentration (the carbon mass to the weight of the solution 1:250) was 240 mg/kg, while from the medium-carbonized water -195 mg/kg. In the case of trivalent chromium, under similar conditions, the effect of the presence of competing ions was much more pronounced (the capacity for a monovalent solution was 140 mg/kg, and for medium-carbonized water only 30 mg/kg). There was a negative correlation observed between the adsorption efficiency of Cr(III) and Cr(VI) (average, or at maximum concentration), and the amount of anions, cations and general mineralization. Analysing the adsorption of solutions of different composition and degree of mineralization, but of similar solution pH values, very high correlations are observed (by the Pearson correlation coefficient).Keywords: chromium, adsorption, activated carbon, the Pearson correlation coefficient WstępWęgle aktywne stosowane są głównie do usuwania z wód związków organicznych [1]. Mogą być również używane w przypadku zanieczyszczenia wód jonami nieorganicznymi. Do najczęściej sorbowanych zanieczyszczeń z tej grupy należą jony metali ciężkich [2][3][4][5][6]. Badania adsorpcji jonów metali ciężkich prowadzone są z roztworów jedno-, jak również wieloskładnikowych [7][8][9]. W związku z obecnoś-cią na powierzchni węgli aktywnych ugrupowań tlenowych o charakterze zarówno kwasowym, jak i zasadowym mogą one adsorbować kationy, a także aniony. Adsorpcja metali ciężkich na węglach aktywnych posiada wiele zalet: -"głębokie" oczyszczenie wody nawet do niewielkich stężeń końcowych, -brak dodatkowych środków chemicznych wprowadzanych do środowiska, -możliwość usuwania równocześnie związków organicznych oraz kationów i anionów metali ciężkich,

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“…5(B). The magnetite prepared by the present coprecipitation method is porous in nature (5) that favors a diffusion controlled process if adsorbed ions through the pores of the nano-magnetite [33,34].…”

Section: Temperature Effectmentioning

confidence: 99%

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

2017

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NANO-MAGNETITE was used as an eco-friendly sorbent (without the usage of surfactants during the synthesis) for removing Pb(II), Cd(II) and Cr(III) from water and wastewater. A single 7 nm cubic phase for magnetite was ascertained by X-Rays diffraction (XRD) and high resolution transmission electron microscope (HRTEM).Field emission scanning electron microscopy (FESEM) image showed the agglomeration of magnetite particles upon adsorption. The Langmuir isotherm was used to estimate the maximum adsorption capacities of 576.4, 144.3 and 301.0 mg/g for Pb(II), Cd(II) and Cr(III), respectively.The adsorption mechanism followed a pseudo-second order kinetics.The studied competing cations and anions showed minor effects on the rate of adsorption.Magnetite with high adsorption ability adsorbed Pb(II), Cd(II) and Cr(III) from a ternary mixture as effectively as from their individual solutions. The presented sorbent can be regenerated by 1% HNO 3 with a recovery percent of 91.4 % and reused with an adsorption efficiency of 84.1 % compared to the freshly prepared magnetite. As an example of application, the nano-magnetite was used to decontaminate river water-samples from lead ions.

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Removal of chromium(VI) from wastewater by activated carbon developed from Tamarind wood activated with zinc chloride

Cited by 341 publications

References 28 publications

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Adsorptive removal of hazardous anionic dye “Congo red” from wastewater using waste materials and recovery by desorption

Chromium Adsorption from Waters of Different Chemical Composition

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

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