Removal of Silver (I) from Aqueous Solutions by Natural Bentonite

Hefne, J.; Mekhemer, W. K.; Alandis, Naser M.; Aldayel, Omar; Alajyan, T.

doi:10.4197/sci.22-1.11

Cited by 52 publications

(50 citation statements)

References 37 publications

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“…This means that chemical interaction between adsorbent sites and aqueous metal ions could be the sole rate determining step. The values of the second order rate constant (k 2,ad ), equilibrium adsorption capacity (q e ) and the initial sorption rate (h o ) were such as found in the literature [4,18,27].…”

Section: Adsorption Kineticsmentioning

confidence: 83%

“…2) Lagergren models and the Morris-Weber intraparticle diffusion (Eq. 3) model [4,6]. The Cu(II) adsorption process was found to follow Lagergren pseudo-second order kinetics complimented by intra-particle diffusion kinetics at prolonged periods of equilibration.…”

Section: Adsorption Kineticsmentioning

confidence: 95%

“…Exploitations have therefore; recently focused on the use of non-conventional agricultural by-products and other naturally derived waste geo-material adsorbents because they are easily obtainable, relatively low-priced and can easily be incorporated in the ecosystems if they are appropriately cleansed of the adsorbates. Examples of low cost adsorbents which have been used in the adsorptive removal of heavy metals from aqueous solutions in the recent past include dried pine fruits [2], magnetite [3], natural and treated bentonites [4], diaspore [5], and modified and unmodified coconut fiber [6].…”

Section: Introductionmentioning

confidence: 99%

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<b>Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth</b>

Wambu

Muthakia

wa-Thiong’o

et al. 2011

Bull. Chem. Soc. Eth.

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CT. This study investigated the kinetics and thermodynamics of copper(II) removal from aqueous solutions using spent bleaching earth (SBE). The spent bleaching earth, a waste material from edible oil processing industries, was reactivated by heat treatment at 370 o C after residual oil extraction in excess methylethyl ketone. Copper adsorption tests were carried out at room temperature (22±3 ºC) using 5.4 x 10 -3 M metal concentrations. More than 70% metal removal was recorded in the first four hours although adsorption continued to rise to within 90% at 42 hours. The pH, adsorbent dosage and initial concentrations were master variables affecting RSBE adsorption of Cu(II) ions. The adsorption equilibrium was adequately described by the DubininRadushkevich (D-R) and the Temkin isotherms and the maximum sorption capacity derived from the D-R isotherm was compared with those of some other low cost adsorbents. The adsorption process was found to follow Lagergren Pseudo-second order kinetics complimented by intra-particle diffusion kinetics at prolonged periods of equilibration. Based on the D-R isotherm adsorption energy and the thermodynamic adsorption free energy ∆G, it was suggested that the process is spontaneous and based on electrostatic interactions between the metal ions and exposed active sites in the adsorbent surface. KEY WORDS KEY WORDS KEY WORDS

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Section: Adsorption Kineticsmentioning

confidence: 83%

Section: Adsorption Kineticsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

<b>Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth</b>

Wambu

Muthakia

wa-Thiong’o

et al. 2011

Bull. Chem. Soc. Eth.

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“…6. This might be the overlapping of particles resulting in overcrowding of the adsorption sites (Hefne et al, 2010). Figure 6 showed the lead adsorbed amount reached equilibrium around 0.3 g as well.…”

Section: Dose Effectmentioning

confidence: 95%

Synthesis and Characterization of Marine Clay-Supported Nano Zero Valent Iron

How¹,

Yaacob²

2015

American Journal of Environmental Sciences

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This study reports the preparation and characterization of marine clay nano zero valent iron (MC+nZVI) where marine clay acts as the composite material. Marine clay was air dried and pulverized before used. Basically, MC+nZVI was synthesized by chemical reduction method. The materials synthesized were left oven dried overnight at 50°C. The obtained materials were characterized by Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR). FESEM images show that the nZVI particles dispersed well on the surface of marine clay thus reducing aggregation of nZVI. TEM images show that the particles have the shell-core structure and the particles sizes were around 29.92-57.11 nm for MC+nZVI. XPS spectrums indicate the existence of Fe 0 on the synthesized MC+nZVI. Other than that, XRD and FTIR results also show that there exists the formation of iron oxides on the surface of MC+nZVI. The adsorption capability of MC+nZVI is increased by 15% compared to marine clay. Therefore, increment of MC+nZVI adsorption capacity might be due to the welldispersed nZVI thus enhancing the performance of MC+nZVI.

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“…1) shows the presence of the characteristic peaks of montmorillonite (2Ɵ = 22° and 62°) and quartz (2Ɵ = 27°) [25] as the main components of Saudi bentonite [26]. Figure 2 depicts the nitrogen adsorptiondesorption isotherm of the bentonite.…”

Section: Xrdmentioning

confidence: 99%

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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Removal of Silver (I) from Aqueous Solutions by Natural Bentonite

Cited by 52 publications

References 37 publications

<b>Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth</b>

<b>Kinetics and thermodynamics of aqueous Cu(II) adsorption on heat regenerated spent bleaching earth</b>

Synthesis and Characterization of Marine Clay-Supported Nano Zero Valent Iron

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

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