Adsorption characteristics of Cu(II) and Pb(II) onto expanded perlite from aqueous solution

Sarı, Ahmet; Tüzen, Mustafa; Çıtak, Demirhan; Soylak, Mustafa

doi:10.1016/j.jhazmat.2007.02.052

Cited by 256 publications

(125 citation statements)

References 40 publications

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“…The E values ranges for 1-8 kJ mol −1 for physical sorption and from 8 to 16 kJ mol −1 for chemical sorption (Sari et al 2007). The calculated E values from D to R isotherm for both derived and thiolfunctional ranges between 1.925 and 5.271 kJ mol −1 (less than 8 kJ mol −1 ), indicating that the type of sorption of Cd(II) is physical sorption and this was also confirmed by the Temkin model.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Derived and thiourea-functionalized silica for cadmium removal: isotherm, kinetic and thermodynamic studies

2018

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The present study explored the feasibility of using derived and thiourea-functionalized silica as adsorbent for the removal of cadmium under different experimental conditions. Effects of various parameters such as function of point of zero charge (pH PZC ), solution pH, sorbent-sorbate resident time and ratio, concentration and temperature were investigated. The sorption of cadmium followed the pseudo-second-order rate kinetics. Thermodynamic studies revealed that the sorption of cadmium was endothermic and spontaneous, with good affinity toward the sorbent. Various isotherm models, viz. Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Harkins-Jura, and Halsey isotherms were used to analyze the equilibrium data at different temperatures. The Freundlich, Halsey, Langmuir, and Temkin models were found to be in good agreement with the experimental data with high R 2 , low RMSE, and low χ 2 values. The results show that the sorption capacity increases with an increase in solution temperature from 28 to 65 °C. The maximum sorption capacity calculated from Langmuir isotherm was 27.55 and 28.41 mg g −1 for derived and thiourea-functionalized silica, respectively, at optimum condition of pH 5 and contact time of 120 min.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Derived and thiourea-functionalized silica for cadmium removal: isotherm, kinetic and thermodynamic studies

2018

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“…[19][20][21] Their unique chemical composition makes these wastes economic and ecofriendly alternatives the removal of chlorophenols. 6,7,22,23 We are interested in bark of Turkish Sweetgum as biosorbent.…”

Section: Introductionmentioning

confidence: 99%

Biosorption of 2,4 dichlorophenol onto Turkish Sweetgum bark in a batch system: equilibrium and kinetic modeling

Yıldız¹,

Keskin²,

Demirak³

2017

ACSi

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In this study, Turkish Sweetgum bark was used as a new biosorbent to investigate the removal of hazardous 2,4 dichlorophenol (2,4-DCP) from aqueous solutions in batch biosoption experiments. The effective usage of Turkish sweetgum bark is a meaningful work for environmental utilization of agricultural residues. The effects of experimental parameters like solution pH, contact time, initial concentration of adsorbate and amount of bisorbent dosage were investigated in a series of batch studies at 25 °C. Taguchi's Orthogonal Array (OA) analysis was used to find the best experimental parameters for the optimum design process in this study. The functional groups and surface properties of biosorbent were characterized by using Fourier transformer infrared (FTIR) and scanning electron microscopy (SEM) techniques. The experimental data were fitted to Langmuir isotherm and Freundlich isotherm models. There is a good agreement between the parameters and this confirms the monolayer adsorption of 2,4-DCP onto sweetgum bark. As a result of kinetic studies, the pseudo-second-order kinetic model was found to be suitable for all the data. Also, the results of the study show that Turkish Sweetgum bark can be potential as a low-cost alternative commercial adsorbents for removal 2,4 dichlorophenol from aqueous solutions.

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“…9,10 Materials prepared by chemical combustion have attracted increasing interest because of their novel properties and potential technological applications (e.g., adsorption, adhesion, surface diffusion, and catalysis). The adsorption process with chemical combustion prepared materials has significant advantages over chemical precipitation, coagulation, chemical oxidation and reduction, ion exchange, reverse osmosis, membrane processes, filtration and other separation technologies reported in the specialized literature, [11][12][13] due to lower operation cost, high selectivity, high efficiency in removing very low levels of heavy metals from dilute solutions and easy handling.…”

Section: Introductionmentioning

confidence: 99%

Influence of Textural Properties and Surface Fractal Dimensions on the Cobalt Adsorption Behavior of Rice Hull Ash Prepared via Solid Combustion

Sánchez‐Flores¹,

Granados-Correa²,

Bulbulian³

2016

J. Braz. Chem. Soc.

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Rice hull ash was prepared via a fast chemical combustion method with ammonium nitrate, urea and milled rice hull. Urea was used as the chemical fuel. The mixture was heated to various temperatures (100 to 1000 °C), and the resulting products were compared with products obtained via calcination, in which samples were heated to the same temperatures for 2 hours. Changes in the structure, morphology, texture and surface fractal dimensions with respect to temperature were examined and found to be highly relevant for adsorption applications. The prepared powders were characterized physicochemically by X-ray diffraction and N 2 -physisorption measurements. The surface fractal dimensions of the prepared materials were calculated from N 2 -adsorptiondesorption isotherms. The results indicate that the fast combustion samples have larger surface fractal dimensions than calcined samples. A correlation between fractal dimensions and Co 2+ ion adsorption was found. The present study demonstrates the importance of textural properties and surface fractal dimensions in the adsorption performance of adsorbents.Keywords: rice hull ash (RHA), cobalt adsorption capacity, combustion process, calcination treatment, surface fractal dimensions IntroductionRice hull (RH) is a low-cost agricultural waste obtained from rice hull mills. RH is used by various industries as a boiler fuel to produce steam. Burning rice hull for long periods generate energy results in the waste product rice hull ash (RHA), which is rich in silica and has a considerable cation exchange capacity due to the polar groups present on its surface. Srivastava et al. 1 and An et al. 2 reported that RHA is an effective adsorbent of metal ions from water. It is well known that the efficiency and cost-effectiveness during a waste water adsorption process is determined by choosing suitable potential adsorbent particles with improved structural and textural characteristics. 3 In the search for materials with appropriate physico-chemical characteristics to be used as efficient and low cost adsorbents many efforts, including the development of chemical processes, have been developed to reduce the hazardous effects of toxic pollutants. 4,5 On the other hand, combustion synthesis is a rapid chemical process based on the explosive decomposition of urea or other organic fuels.6 This decomposition provides heat for calcinations and produces high temperatures. 7 Combustion synthesis has been used to prepare a variety of advanced ceramics, composites, alloys, and nanomaterials.8 Chemical combustion provides an attractive alternative to other complex synthesis methods, requiring minimal use of specialized equipment and allowing for rapid preparation while producing a product with optimal structural and functional properties. It has been shown that the combustion process favors the retention of metallic chemical species on adsorbent solids due to their improved textural characteristics.9,10 Materials prepared by chemical combustion have attracted increasing interest because of their ...

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Adsorption characteristics of Cu(II) and Pb(II) onto expanded perlite from aqueous solution

Cited by 256 publications

References 40 publications

Derived and thiourea-functionalized silica for cadmium removal: isotherm, kinetic and thermodynamic studies

Derived and thiourea-functionalized silica for cadmium removal: isotherm, kinetic and thermodynamic studies

Biosorption of 2,4 dichlorophenol onto Turkish Sweetgum bark in a batch system: equilibrium and kinetic modeling

Influence of Textural Properties and Surface Fractal Dimensions on the Cobalt Adsorption Behavior of Rice Hull Ash Prepared via Solid Combustion

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