Investigation of adsorption and ultrasound assisted desorption of lead (II) and copper (II) on local bentonite: A modelling study

Korkut, Özlem; Şayan, Enes; Laçin, Oral; Bayrak, Bahar

doi:10.1016/j.desal.2010.03.045

Cited by 46 publications

(11 citation statements)

References 21 publications

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“…The zeolite -UF system effectively treated wastewater containing 320 mg/l of lead at pH 5 6, resulting in removal efficiencies higher than 99.9%. This combined system performed better than most systems that employed adsorbents for lead removal, while it achieved similar lead removal as that obtained by Korkut et al (2010) who used bentonite, that of Malandrino et al (2006) who utilized vermiculite as adsorbent and that of Mouflih et al (2006) who employed natural phosphate. When the combined system of minerals (zeolite, bentonite or vermiculite) -UF was employed for the treatment of wastewater containing 1000 mg/l of Pb(II) at pH 5 6, the removal efficiencies achieved were higher than 98.5% for all mineral concentrations and reached .99.9% when bentonite was employed.…”

Section: Theorysupporting

confidence: 54%

“…Among these treatment methods, adsorption is an effective method for the removal of metals, provided that low-cost materials are utilized as adsorbents (Bhattacharyya and Gupta, 2008;O'Connell et al, 2008). Materials employed in previous works as adsorbents for lead removal include grape stalk waste, rice husk, sawdust, activated carbon, different types of biomass, wheat bran, natural and modified minerals such as zeolite, bentonite and kaolinite (Martínez et al, 2006;Wong et al, 2003;Taty-Costodes et al, 2003;Abdel-Halim et al, 2003;Zulkali et al, 2006;Lo et al, 1999;Gupta and Rastogi, 2008;Ö zer, 2007;Naseem and Tahir, 2001;Korkut et al, 2010;Gupta and Bhattacharyya, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Pre‐treatment of Industrial Wastewater Polluted with Lead Using Adsorbents and Ultrafiltration or Microfiltration Membranes

Katsou

Malamis

Haralambous

2011

Water Environment Research

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This work investigated the use of ultrafiltration (UF) or microfiltration (MF) membranes combined with natural minerals for the pre-treatment of wastewater containing high amounts of lead. The effects of initial lead concentration, solution pH, membrane pore size, mineral type and concentration and mineral -metal contact time were investigated. Lead removal accomplished by the UF system was higher in wastewater compared to that obtained in aqueous solutions and this was attributed to the formation of insoluble metal precipitates/complexes, which were effectively retained by the membranes. At pH 5 6 the dominant removal mechanism was precipitation/complexation, while mineral adsorption enhanced lead removal. The combined use of minerals and UF/MF membranes can effectively remove lead from wastewater resulting in a final effluent that can be further treated biologically with no biomass inhibition problems or can be safely discharged into municipal sewers. Kinetics investigation revealed a two-stage diffusion process for all minerals employed. The Langmuir isotherm exhibited the best fit to the experimental data. Water Environ. Res., 83, 298 (2011).

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Section: Theorysupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Pre‐treatment of Industrial Wastewater Polluted with Lead Using Adsorbents and Ultrafiltration or Microfiltration Membranes

Katsou

Malamis

Haralambous

2011

Water Environment Research

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“…However, among all the methods adsorption is highly effective and economical. Because of low cost, large quantity, and high specific surface area, bentonite was widely used as an efficient novel adsorbent to adsorb heavy metal ions from waste water [3].…”

Section: Introductionmentioning

confidence: 99%

Notice of Retraction: Application of High Efficiency Inorganic Adsorbent Bentonite on Removal of Ni(II) from Aqueous Solutions

Meng

Zhang

et al. 2011

2011 5th International Conference on Bioinformatics and Biomedical Engineering

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Bentonite, because of high adsorption capacity, can be used as an effective adsorbent to treat waste water contaminated by trace heavy metals. Adsorption behavior of Ni(II) from aqueous solutions on bentonite was investigated as a function of connect time, pH, clay dosage, and temperature using batch technology. The results showed that 2 hours were enough to achieve equilibration and kinetic adsorption process was described by the pseudo-second-order rate equation well. The adsorption of Ni(II) on bentonite was strongly dependent on pH values, and the main control mechanisms were ionic exchange and surface complexation. The adsorption efficiency increased as the clay amount increasing and the removal percentage of Ni(II) achieved 98% with the dosage of 0.5 g/100mL. The amount of adsorption of Ni(II) on bentonite increased with the increasing of temperature. The negative values of ΔG and the positive value of ΔH indicated that adsorption of Ni(II) on bentonite was an endothermic process in nature. The adsorption process followed well by Langmuir model and the Q m was 26.8821 mg/g. Thus, bentonite can be used as an effective adsorbent for removing trace Ni(II) from aqueous solutions.

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“…In the planning and analysis of the experiments, coded values are usually applied instead of absolute values of the factors . The experiments were carried out using the above‐mentioned methodology as also described elsewhere . The parameters, such as pressure ( x 1 ), temperature ( x 2 ) and solid‐liquid ratio ( x 3 ) were chosen as independent variables and their effect on the oxidation stability was investigated using the 2 3 factorial design.…”

Section: Methodsmentioning

confidence: 99%

Improving oxidation stability of sunflower biodiesel by partial hydrogenation using a special catalyst

Korkut

Erentürk

2015

Biofuels Bioprod Bioref

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The aim of this study was to increase the oxidation stability of biodiesel from sunfl ower-oil by partial-hydrogenation. Activated carbon, which was obtained from viscum album L., was used as a new and effective original phase transfer catalyst during partial hydrogenation. Temperature, pressure, and catalyst/biodiesel ratios were selected as the experimental parameters and their effects on the oxidation stability were investigated by using the 2 3 factorial design. A fi rst-order model was obtained using analysis of variance. The physical properties such as density, viscosity, pour point, and cloud point of sunfl ower biodiesel samples were determined using the standard methods. The oxidative stability (induction period, IP) values were found experimentally by the Rancimat method and cis and trans-confi gurations of the biodiesel samples were characterized by Fourier transform infrared (FTIR) spectra before and after hydrogenation. Partially hydrogenated biodiesels were found to have better oxidative stability, and lower pour point and cloud point properties compared to non-hydrogenated sunfl ower biodiesel. It can be stated that kinematic viscosities and the densities of the partial hydrogenated biodiesels did not change signifi cantly.

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Investigation of adsorption and ultrasound assisted desorption of lead (II) and copper (II) on local bentonite: A modelling study

Cited by 46 publications

References 21 publications

Pre‐treatment of Industrial Wastewater Polluted with Lead Using Adsorbents and Ultrafiltration or Microfiltration Membranes

Pre‐treatment of Industrial Wastewater Polluted with Lead Using Adsorbents and Ultrafiltration or Microfiltration Membranes

Notice of Retraction: Application of High Efficiency Inorganic Adsorbent Bentonite on Removal of Ni(II) from Aqueous Solutions

Improving oxidation stability of sunflower biodiesel by partial hydrogenation using a special catalyst

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