Treatment of wastewater contaminated with cobalt using Saudi activated bentonite

Al-Shahrani, Saad

doi:10.1016/j.aej.2013.10.006

Cited by 73 publications

(40 citation statements)

References 20 publications

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“…This may be attributed to the saturation of bentonite adsorption sites with the metal ions. A similar trend was reported by AlShahrani [15], where 90 % cobalt removal was observed when the initial concentration was 25 mg l -1 and a prominent decrease to 37 % was observed when the concentration was increased to 200 mg l -1 .…”

Section: Effect Of Initial Concentrationsupporting

confidence: 88%

“…Moreover, the equilibrium data of adsorption was in agreement with Langmuir's model under all operating parameters: temperature, initial Co(II) concentrations and adsorbent dose. The adsorption capacities of the bentonite for Co(II) reported here, was higher than previous data for bentonite samples from Saudi Arabia [15]. Increasing the temperature not only enhanced the rate of adsorption, but also its extent; this finding was supported by the positive value for the enthalpy change of the adsorption reaction.…”

Section: Discussioncontrasting

confidence: 48%

“…The adsorption of Co(II) to bentonite clay displays a strong pH dependence [15]. At highly acidic pH, the H + or H 3 O + ions compete with Co(II) ions for active binding sites on the surface of bentonite and hence reduce Co(II) adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…The negative zeta potential also explains the strong tendency of montmorillonite particles to adsorb cations in order to balance the high negative charge [12,13]. A number of researchers have used Saudi bentonite clay for heavy metal removal: Attia et al [14] succeeded in 100 % removal of Ni +2 from aqueous solutions, while Al-Shahrani [15] reported cobalt removal using bentonite clay.…”

Section: Introductionmentioning

confidence: 99%

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Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

Al-Duaij

Attia

Khezami

et al. 2016

Maced. J. Chem. Chem. Eng.

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Natural bentonite clay from Saudi Arabia was used to remove cobalt from aqueous solution. The clay samples were first characterized for their chemical composition and structure. Batch sorption studies were then conducted to assess their capacity to remove cobalt. The effect of contact time, initial analyte concentration, bentonite dose and temperature on the adsorption was investigated. The results showed that equilibrium was attained in 60 minutes. The metal adsorption was fitted to a Langmuir isotherm model and the maximum monolayer adsorption capacity was found to be 19.85 mg g −1 at 333 K. The pseudosecond-order kinetic model provided the best correlation to the experimental data. The application of an intra-particle diffusion model revealed that the adsorption mechanism of the cobalt ions is a rather complex process and that diffusion is involved in the overall rate of the adsorption process, but it is not the only rate-controlling step. The activation energy, E a , ranged between 4.33 and 9.14 kJ mol −1 , indicating a physical adsorption process.Keywords: bentonite; cobalt; kinetics; equilibrium ОТСТРАНУВАЊЕ НА КОБАЛТ(II) ОД ВОДНИ РАСТВОРИ СО ЛОКАЛЕН САУДИСКИ БЕНТОНИТ: КИНЕТИЧКИ И РАМНОТЕЖНИ ИСТРАЖУВАЊАПриродната бентонитна глина од Саудиска Арабија беше употребена за отстранување на кобалт од водни растврори. Глинените примероци прво беа карактеризирани преку хемиска анализа и структура. Потоа беа спроведени сорпциски истражувања со цел да се процени нивниот капацитет за отстранување на кобалт. За атсорпцијата беа испитувани ефектот на времето на дејството, почетната концентрација на аналитот, бентонитната доза и температурата. Резултатите покажаа дека рамнотежата се постигнува за 60 минути. Атсорпцијата на металот беше усогласена со изотермен модел на Langmuir и беше определено дека максималниот монослоен капацитет изнесува 19,85 mg g −1 на 333 K. Најдобра корелација беше постигната со кинетички модел од псевдо-втор ред. Примената на дифузиски модел на интра-честички откри дека атсорпцискиот механизам на јоните на кобалт е доста сложен процес и дека вклучува дифузија во севкупната брзина на атсорпцискиот процес, но не е чекорот што ја контролира брзината. Активациската енергија, E a , се движи од 4,33 до 9,14 kJ mol −1 што укажува на физички атсорпционен процес.

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Section: Effect Of Initial Concentrationsupporting

confidence: 88%

Section: Discussioncontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

Al-Duaij

Attia

Khezami

et al. 2016

Maced. J. Chem. Chem. Eng.

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“…Different materials were used as adsorbents in the adsorption technique such as activated carbons, natural materials, zeolite, clay, silica, modified silica, alumina and, etc. [14][15][16][17][18][19][20][21][22]. However, the reports clarified low adsorption capacity of these adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of CNTs/MnO₂ composite for adsorption of ⁶⁰Co(II), ⁶⁵Zn(II) and Cd(II) ions from aqueous solutions

et al. 2016

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CNTs/MnO 2 composite was synthesized by a coprecipitation method after preparation of carbon nanotubes (CNTs) using a chemical oxidation method and was characterized using Fourier transformer infrared (FT-IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The synthesized CNTs/MnO 2 composite was used as a sorbent for the removal of some radionuclides ( 60 Co and 65 Zn-radioisotopes) and Cd (II) ions from aqueous solutions. Different parameters affecting the removal process including pH, contact time and metal ion concentration were investigated. Isotherm and kinetic models were studied. Adsorption data was interpreted in terms of both Freundlich and Langmuir isotherms and indicated that the CNTs/MnO 2 composite complied well with both Langmuir and Freundlich models for Zn and Cd(II) ions from loaded samples was studied using different eluents.

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Deproteinized natural rubber‐graft‐polyacrylamide‐graft‐polystyrene (DPNR‐g‐PAM‐g‐PSt): Preparation and performance study of a new water swellable rubber

Yang

Yuan

Tian

et al. 2023

J of Applied Polymer Sci

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In this study, the water swellable rubber DPNR-g-PAM-g-PSt (DPP) was prepared by emulsion polymerization in a tert-butyl hydroperoxide/tetraethylenepentamine initiation system using deproteinized natural rubber (DPNR) as the substrate, acrylamide (AM) and styrene (St) as the monomers, and Brij-35 as the emulsifier. On this basis, the bentonite (BT) was added for coblending. The successful grafting of AM and St was verified by particle size, contact angle, Fourier transform infrared, 1 H-NMR, scanning electron microscope, and differential scanning calorimetry. The effects of blending with different amounts of bentonite on the mechanical properties and water absorption properties were discussed. The water swellable rubber DPP and DPP/BT prepared in this study have good prospects for applications in industry, construction, medical care, environmental protection, soil improvement, and nuclear waste treatment.

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Treatment of wastewater contaminated with cobalt using Saudi activated bentonite

Cited by 73 publications

References 20 publications

Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

Evaluation of CNTs/MnO₂ composite for adsorption of ⁶⁰Co(II), ⁶⁵Zn(II) and Cd(II) ions from aqueous solutions

Deproteinized natural rubber‐graft‐polyacrylamide‐graft‐polystyrene (DPNR‐g‐PAM‐g‐PSt): Preparation and performance study of a new water swellable rubber

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Treatment of wastewater contaminated with cobalt using Saudi activated bentonite

Cited by 73 publications

References 20 publications

Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

Evaluation of CNTs/MnO2 composite for adsorption of 60Co(II), 65Zn(II) and Cd(II) ions from aqueous solutions

Deproteinized natural rubber‐graft‐polyacrylamide‐graft‐polystyrene (DPNR‐g‐PAM‐g‐PSt): Preparation and performance study of a new water swellable rubber

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Product

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Evaluation of CNTs/MnO₂ composite for adsorption of ⁶⁰Co(II), ⁶⁵Zn(II) and Cd(II) ions from aqueous solutions