Equilibrium and kinetic studies of chromium adsorption from wastewater by functionalized multi-wall carbon nanotubes

Hossini, Hooshyar; Rezaee, Abbas; Rastegar, Seyed Omid; Hashemi, Seyedenayat; Safari, Mahdi

doi:10.1007/s11144-014-0699-x

Cited by 18 publications

(7 citation statements)

References 21 publications

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“…This is in accordance with the reported literature for the optimum pH range for Cr(VI) adsorption. [ 27 ] The effect of adsorbent dosage was then studied by varying the dosage from 1 g/L‐ 3 g/L. It can be observed in Figure 3B that the adsorption efficiency first increased to 2 g/L and then remained almost constant.…”

Section: Resultsmentioning

confidence: 99%

Red mud (aluminum industrial waste): An eco‐friendly treatment of electroplating effluent

Verma

Balomajumder

2020

Can J Chem Eng

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In this work, aluminum industrial waste, red mud (RM), was activated to verify its potential in the management of electroplating wastewater containing hexavalent chromium (Cr(VI)). A comparison between the adsorption capabilities of RM and activated red mud (ARM) towards Cr(VI) from aqueous solutions was made. The effects of several parameters were evaluated. The adsorbents were characterized by field emission scanning electron microscopy (FESEM), Fourier transmission infrared spectroscopy (FTIR), x-ray diffraction (XRD), zeta potential, and thermogravimetric analysis (TGA). The particle size was observed as 23.59 nm. The ARM demonstrated an acceptable adsorption capacity of 25.641 mg/g at a pH of 2, adsorbent dosage of 2 g/L, initial Cr(VI) concentration of 100 mg/L, at 25 C. The experimental data is in good agreement with Langmuir adsorption isotherm. The kinetic study was performed to verify that the adsorption follows pseudo-second-order kinetics. In addition, the ARM showed decent recyclability for adsorbing Cr(VI) as even after three adsorption cycles, and the adsorption capacity was reduced by 30%. The results recommend ARM to be an efficient and cost-effective adsorbent for Cr(VI) removal from industrial wastewater.

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Section: Resultsmentioning

confidence: 99%

Red mud (aluminum industrial waste): An eco‐friendly treatment of electroplating effluent

Verma

Balomajumder

2020

Can J Chem Eng

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“…The higher removal efficiency in the lower pH was due to that in the lower pH the surface of date palm fiber positively charged with H + ions. This caused a significantly strong electrostatic attraction between the bioadsornet surface and anionic hexavalent chromium which resulted in increasing Cr(VI) removal efficiency [23]. In the 2.0 < pH < 6.0, the reduced using the following reaction [24].…”

Section: Resultsmentioning

confidence: 99%

Assessment of Cr(VI) Biosorption from Aqueous Solution by Artificial Intelligence

Beigzadeh

Rastegar

2020

Chem. Methodol.

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This work investigates the efficiency of date palm fiber as a biosorbent to the removal of Cr(VI) from aqueous solution. The effect of four main factors including, the initial pH, initial Cr(VI) concentration, biosorbent dosage, and time were assessed. The results revealed that, the maximum 89% removal of Cr(VI) at time 50 min, initial pH 3.2, initial Cr(VI) 181 ppm, and biosorbent dosage 0.8% (w/v) was obtained. The artificial neural network (ANN) model was developed to predict the Cr(VI) removal as a function of the studied variables. A number of data points were considered as test data to validate the model. The results indicated a high accuracy of the ANN modeling in estimating the target variable.

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“…The comprehensive detail of isotherm model has been reported by Foo and Hameed (2010). The following relations can represent the linear forms of the isotherm models (Hossini et al., 2014; Niri et al., 2015; Wang et al., 2010) …”

Section: Resultsmentioning

confidence: 99%

Equilibrium and kinetics studies of Direct blue 71 adsorption from aqueous solutions using modified zeolite

Mirzaei

Mahvi

Hossini

2017

Adsorption Science & Technology

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This study deals with the application of Iranian zeolite as a low cost adsorbent for the removal of the Direct blue 71 (DB 71) from colored solution. Important parameters including equilibrium and contact time, initial dye concentration, effect of pH, and zeolite dosage were evaluated. Maximum dye removal was obtained at about 99.8% for 25 mg/L at 120 min of equilibrium. Higher adsorption efficiency of direct dye was obtained at higher dose and acidic pH. To analyze the adsorption equilibrium and kinetic, Langmuir, Freundlich, and Temkin isotherms as well as four kinetic models encompassing pseudo first-order, pseudo second-order, intraparticle diffusion, and Elovich were evaluated. The Langmuir isotherm (R 2 ¼ 0.995) and pseudo second-order models, gave the best fit to equilibrium experimental data. In Langmuir analysis, the maximum adsorption capacity (q m) by 13.66 mg/g was determined. Finally, the characteristics of zeolite including both natural and modified, such as compositions, surface morphology by X-ray diffraction technique (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM) were obtained. According to XRF analysis, it was

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Equilibrium and kinetic studies of chromium adsorption from wastewater by functionalized multi-wall carbon nanotubes

Cited by 18 publications

References 21 publications

Red mud (aluminum industrial waste): An eco‐friendly treatment of electroplating effluent

Red mud (aluminum industrial waste): An eco‐friendly treatment of electroplating effluent

Assessment of Cr(VI) Biosorption from Aqueous Solution by Artificial Intelligence

Equilibrium and kinetics studies of Direct blue 71 adsorption from aqueous solutions using modified zeolite

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