Batch kinetics and thermodynamics of chromium ions removal from waste solutions using synthetic adsorbents

Gasser, M.S.; Morad, G. A.; Aly, H. F.

doi:10.1016/j.jhazmat.2006.07.065

Cited by 56 publications

(28 citation statements)

References 19 publications

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“…Both q m and b decreased in the order of increasing temperature. While this outcome is contradictory to some of the studies involving Cr(VI) adsorption on various materials such as humic acids [28], sawdust activated carbon [8] magnesia cement [29], groundnut husk carbon [2], Sharma and Weng [30] have reported decreasing Langmuir constants with temperature for adsorption of Cr(VI) on riverbed sand which is an indication that the behavior is adsorbent specific.…”

Section: Equilibrium Isothermsmentioning

confidence: 62%

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Adsorption of chromium on chitosan: Optimization, kinetics and thermodynamics

Aydin¹,

Aksoy²

2009

Chemical Engineering Journal

358

142

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Section: Equilibrium Isothermsmentioning

confidence: 62%

“…(13)), pseudo-second order (Eq. (14)) [3,13,[27][28][29][30], Elovich (Eq. (15)) [30] and intra-particle diffusion (Eq.…”

Section: Kinetic Analysismentioning

confidence: 99%

Adsorption of chromium on chitosan: Optimization, kinetics and thermodynamics

Aydin¹,

Aksoy²

2009

Chemical Engineering Journal

358

142

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“…To determine the isotherms, the initial pH was kept at 7 and the concentration of boron varied over the range 3-7 mg L −1 . The Freundlich isotherm is derived to model multilayer adsorption and the empirical isotherm is defined as follows 33 q e = KC n (13) According to this model the initial amount of adsorbed compound increases rapidly, then slows down with increasing surface coverage. Equation (13) can be linearised and the Freundlich constants determined as follows 34 log q e = log k f + n log C e (14) where k f is the Freundlich constant related to adsorption capacity, n is the energy or intensity of adsorption, C e is the equilibrium concentration of boron (mg L −1 ).…”

Section: Studies On Adsorption Isothermmentioning

confidence: 99%

Optimization of the process parameters for the removal of boron from drinking water by electrocoagulation—a clean technology

Vasudevan

Sheela

Lakshmi

et al. 2010

J of Chemical Tech & Biotech

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BACKGROUND: There are a number of articles related to removal of boron by electrocoagulation using aluminium electrodes, but there are fewer articles describing the use of magnesium as the anode material. The main disadvantage of aluminium electrodes is the residual aluminium present in the treated water due to cathodic dissolution, which can create health problems. In the case of magnesium electrodes, there is no such disadvantage. This paper presents the results of studies on the removal of boron using magnesium and stainless steel as anode and cathode, respectively.

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“…Gasser et al 18) used various synthetic adsorbents and found the Cr(VI) capacity of the adsorbents to vary in the range 18.8-22.4 mg/g. Using amorphous alumina oxide to remove Cr(VI) from electroplating wastewater, Álvarez-Ayuso et al 19) found the Langmuir capacity depended on ionic strength but generally varied in the range 63.1-78.1 mg/g.…”

mentioning

confidence: 99%

Magnetic Fixed-bed Column for Cr(VI) Removal from Aqueous Solution Using Schwertmannite

et al. 2008

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The fine particles of schwertmannite as an iron oxyhydroxide adsorbent has been suggested as a novel and strong Cr(VI) sorbent for treatment of Cr-contaminated industrial wastewater. The removal process was conducted in both batch and continuous trials. As a result of the batch experiments, the maximal adsorption capacity of the schwertmannite was obtained as 178 mg/g which was quite high amount in comparison with the usual applied Cr(VI) sorbents in the literatures. The continuous removal process involved a combination of a fixed bed column with a high gradient magnetic field which was firstly introduced as a novel designation of a fixed bed column to overcome the difficulties accompanied with the application of some especial fine particle adsorbents through the fixed-beds. The experimental results revealed that the magnetization force had a great function in this process to control the shape and the fitness of the bed during the sorption test as well as to simplify the experimental set-up.KEY WORDS: magnetic fixed bed column; Cr removal; high magnetic field; schwertmannite; wastewater treatment; electromagnetic processing of materials.tion, however, has some inherent limitations to be utilized as a continuous filtering system because of time-dependent plugging and saturation of its matrix.The most optimal configuration for continuous-flow sorption is the packed-bed column which gets gradually saturated from the feed to the solution exit end. High-quality fixed-bed column hardware is the subject of several US patents. In our study work, the experimental trials of the process have been conducted for many times by directly packing the column with the fine particle size of schwertmannite as the most strong Cr adsorbents. Extremely fine particles and mud like properties of the adsorbent, however, has caused a verity of problems to the system such as high pressure drop, mass transfer resistance and so on. To solve the problems dealing with the system, a magnetic fixed-bed column, as a novel designation of the fixed-bed columns, has been presented in this study. Moreover, the batch Cr(VI) adsorption data containing equilibrium models using the schwertmannite adsorbent and also the effect of pH on the adsorption to predict the sorption characteristics of the adsorbent have been given. Materials and MethodsAll chemicals used were of high purity and analytical grades. The schwertmannite powder as the chemical adsorbent of Cr(VI) in these experiments was made by homogenous hydrolysis of iron ferric salt (Fe 2 (SO 4 ) 3 · nH 2 O) according to the methods mentioned in our pervious work. 14)Stock solution of 130 mg/L of Cr(VI) for use in the fixed column experiment was prepared by dissolving of a known amount of K 2 Cr 2 O 7 in dionized water. In the batch mode adsorption trials, 50 mL of the solution with desired concentrations of Cr and the adsorbent were mixed in a bottle of 100 mL and shaken for about 5 h to reach to the equilibrium state. Then the yielded solution was filtered through a paper filter and then chromium c...

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Batch kinetics and thermodynamics of chromium ions removal from waste solutions using synthetic adsorbents

Cited by 56 publications

References 19 publications

Adsorption of chromium on chitosan: Optimization, kinetics and thermodynamics

Adsorption of chromium on chitosan: Optimization, kinetics and thermodynamics

Optimization of the process parameters for the removal of boron from drinking water by electrocoagulation—a clean technology

Magnetic Fixed-bed Column for Cr(VI) Removal from Aqueous Solution Using Schwertmannite

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