Adsorption studies on ground shells of hazelnut and almond

Bulut, Yasemin; Tez, Zeki

doi:10.1016/j.jhazmat.2007.03.044

Cited by 232 publications

(106 citation statements)

References 23 publications

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“…The negative values of ΔG° indicate that the adsorption process is spontaneous However, the ΔG° value changed from negative to positive value on increasing the temperature which means that the adsorption reaction is non-feasible and non-spontaneous at higher temperature indicating that the spontaneous nature of adsorption is inversely proportional to the temperature [114].…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

El-Araby¹,

Ibrahim²,

Mangood³

et al. 2017

GEP

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In this study, the adsorption behavior of copper(II) ions from aqueous solutions onto sesame husk (SH) was investigated. The effect of different parameters such as pH, contact time, adsorbent dosage, adsorbate concentration, temperature and agitation speed was studied. Thermodynamic parameters, equilibrium isotherms and kinetic data have been evaluated. The functional groups and surface morphology of SH adsorbent were characterized by FTIR and SEM. Adsorption equilibrium isotherms were expressed by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) adsorption models and it was found that Langmuir adsorption model fits the experimental data better than Freundlich and D-R models. The adsorption can be best described by the pseudo second-order kinetic model.

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Section: Thermodynamic Parametersmentioning

confidence: 99%

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

El-Araby¹,

Ibrahim²,

Mangood³

et al. 2017

GEP

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“…Adsorption in the natural or uncontrolled situation typically involves a combination of active and passive transport mechanisms starting with the diffusion of the metal ion to the surface of the adsorbent (Donmez et al 1999). A number of plant materials or agricultural residues have been used largely as adsorbents for the removal of Cu(II) from water and wastewater (Bulut and Tez 2007). These include peat (Lodenius et al 1983), bark (Vanquez et al 2002), cellulose (Navarro et al 1996), lignite (Eligwe et al 1999), coconut husks (Hasany et al 2003), rice husk (Khalid et al 1999), vegetables (Ponomarev et al 1997), tea leaves (Kiyohara et al 2003), baggase fly ash (Gupta and Ali 2000), peanut hull carbon (Periasamy and Namasivayam 1996), pine bark (Al-Asheh et al 2003), sphagnum moss peat (McKay 2000) etc.…”

Section: Introductionmentioning

confidence: 99%

Adsorption studies of Cu(II) on Boston fern (Nephrolepis exaltata Schott cv. Bostoniensis) leaves

Rao

Khan

2016

Appl Water Sci

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Adsorption studies were done on Boston fern leaves for the effective removal of Cu(II) ions from aqueous solution. It has been tested for the first time for heavy metal adsorption from aqueous solution. This promising material has shown remarkable adsorption capacity towards Cu(II) ions which confirm its novelty, ease of availability, non-toxic nature, cheapness, etc., and give the main innovation to the present study. The adsorbent was analyzed by FT-IR, SEM and EDS. The effect of pH, contact time, initial metal ion concentration and temperature on the adsorption was investigated using batch process to optimize conditions for maximum adsorption. The adsorption of Cu(II) was maximum (96 %) at pH 4. The experimental data were analyzed by Langmuir, Freundlich and Tempkin isotherms. The kinetic studies of Cu(II)were carried out at room temperature (30°C) in the concentration range 10-100 mg L -1 . The data obtained fitted well with the Langmuir isotherm and pseudo-secondorder kinetics model. The maximum adsorption capacity (q m ) obtained from Langmuir adsorption isotherm was found to be 27.027 mg g -1 at 30°C. The process was found to be exothermic and spontaneous in nature. The breakthrough and exhaustive capacities were found to be 12.5 and 37.5 mg g -1 , respectively. Desorption studies showed that 93.3 % Cu(II) could be desorbed with 0.1 M HCl by continuous mode.

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“…Among the three kinetic models, the pseudo-second-order model gave the best fit of experimental data, having the highest correlation coefficient (R 2 = 0.999), and the lowest normalised root mean square value RMS (0.82%). According to some authors (Ho, 2003;Bulut and Tez, 2007), this result indicates a high prevalence of chemisorption in the overall sorption process.…”

Section: Pseudo Second-order Modelmentioning

confidence: 85%

Removal of copper(II) ion from aqueous solution by high-porosity activated carbon

Djordjević¹,

Milutin²,

Aleksandar³

et al. 2013

WSA

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The removal of copper(II) ion from aqueous solution by the granular activated carbon, obtained from hazelnut shells (ACHS) (Corylus avellana L. var. lunga istriana), was investigated. The ACHS was prepared from ground dried hazelnut shells by specific method carbonisation and water steam activation at 950 o C for 2 h. The granular activated carbon produced from hazelnut shells has a high specific surface area (1 452 ). In batch tests, the influences of solution pH, contact time, initial metal ion concentration and temperature on the sorption of copper(II) ion on ACHS were studied. The results indicate that sorption of copper(II) ion on ACHS strongly depends on pH values. The adsorption data can be well described by the Langmuir isotherm and Redlich-Peterson model. The monolayer adsorption capacity of the ACHS-copper(II) ion, calculated from the Langmuir isotherms, is 3.07 mmol•g -1. The time-dependent adsorption of copper(II) ion could be described by the pseudo second-order and Elovich kinetics, indicating that the rate-limiting step might be a chemical reaction. The intra-particle diffusion model indicates that adsorption of copper(II) ions on ACHS was diffusion controlled.

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Adsorption studies on ground shells of hazelnut and almond

Cited by 232 publications

References 23 publications

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

Sesame Husk as Adsorbent for Copper(II) Ions Removal from Aqueous Solution

Adsorption studies of Cu(II) on Boston fern (Nephrolepis exaltata Schott cv. Bostoniensis) leaves

Removal of copper(II) ion from aqueous solution by high-porosity activated carbon

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