Adsorption kinetics and isotherm parameters of naphthalene onto natural- and chemically modified bentonite from aqueous solutions

Kaya, Ertuğrul; Gök, Özer; Özcan, Adnan

doi:10.1007/s10450-013-9542-3

Cited by 55 publications

(31 citation statements)

References 44 publications

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“…These may be the reasons that the Freudlich isotherm model gives good simulation. The value of k f is the Freundlich constant related to the bonding energy and adsorption capacity, and the larger the value of k f , the greater the affinity of adsorbate to adsorbent [33,48]. Table 2 demonstrates that the value of k f increases from 4.3051 to 7.3239 with an increase in temperature from 293 to 313 K, showing that higher temperature favors the TA adsorbed on MIEX resin.…”

Section: Adsorption Equilibriummentioning

confidence: 99%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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Tannic acid (TA) is a component of natural organic matter (NOM) and is ubiquitously present in most surface and groundwater due to the decomposition of plant biomass [1][2]. Previous research has demonstrated that TA is toxic for aquatic organisms such as algae, phytoplankton, fish, and invertebrates, which can cause serious environment problems [3]. Particularly, TA can react with chlorine and form carcinogenic disinfection by-products (DBPs) during the conventional chlorination disinfection process of drinking water [4][5]. Therefore, it is necessary to seek effective methods for reducing and removing TA from raw water. [12,16] have been utilized to remove TA from water and wastewater. Among different adsorbents, the anion ion-exchange resin is considered one of the most effective methods due to its high removal efficiency [17]. As a novel anion ionexchange resin, magnetic ion exchange (MIEX) resin can be a potential candidate for TA removal with its promising technology for NOM removal from drinking water [18].Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) This study evaluated the removal characteristics of tanic acid (TA) adsorbed on MIEX resin by batch experiments. MIEX resin can effectively remove TA from raw water at pH 6-9. Chloride and sulfate have adverse effect on the removal of TA. Conversely, bicarbonate can further the removal of TA. The Elovich model is the most suitable for depicting the kinetic process, and liquid film diffusion dominates the adsorption rate. The Freundlich model is reliable for describing the adsorption equilibrium. Adsorption is an endothermic, entropy-driving, and thermodynamically spontaneous process. The energy changes confirm the physical adsorption and dominate adsorption behavior. The sodium chloride solution (0.5%) can effectively regenerate the MIEX resin saturated TA, and the regenerated resin can be used circularly. Therefore, MIEX resin is a promising adsorbent for the removal of TA from raw water.

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Section: Adsorption Equilibriummentioning

confidence: 99%

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Ding¹,

Zhu²,

Du³

et al. 2017

Pol. J. Environ. Stud.

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“…At lower initial concentrations, active adsorption sites on the bentonite surface are not fully occupied, resulting in unsaturated loading [19]. The chitosan loading increased with the stirring speed used during the reaction, reaching a plateau value of 118.10 mg/g at 200 rpm (Figure 4).…”

Section: Chitosan Loading Parametersmentioning

confidence: 99%

“…Effects of microwave radiation times used for activation on the loading of chitosan (Radiation power: 800 W) enhanced the interlayer structure of bentonite. The largest interlayer distance was observed in the chitosan-loaded activated bentonite, indicating that chitosan molecules could become intercalated between the bentonite layers [13,19,25].…”

Section: Materials Characterizationmentioning

confidence: 99%

Effects of Bentonite Activation Methods on Chitosan Loading Capacity

Fan

et al. 2017

Bull. Chem. React. Eng. Catal.

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The adsorption capacity of bentonite clay for heavy metal removal from wastewater can be significantly enhanced by a high loading of chitosan on the surface. In order to enhance the chitosan loading, we tested activating bentonite clay by three methods prior to chitosan loading: sulfuric acid, calcination, and microwave treatments. Meanwhile, several parameters during chitosan loading, namely the initial chitosan concentration, stirring speed, reaction time, temperature, and pH value were investigated. Our results indicate that chitosan is attached to bentonite clay through intercalation and surface adsorption according to X-ray Diffraction (XRD), Scanning Eelectron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR) analyses. The maximum chitosan loading on 200-mesh raw bentonite clay (126.30 mg/L) was achieved under the following conditions: the initial chitosan concentration of 1000 mg/L, the stirring speed of 200 rpm, pH of 4.9, 60 min of reaction time, and temperature of 30 °C. The chitosan loading was further increased to 256.30, 233.70, and 208.83 mg/g, when using bentonite clay activated through 6 min of microwave irradiation (800 W), 10 % sulfuric acid treatment, and calcinations at 600 °C, respectively. When the chitosan loading was increased from 34.76 to 233.7 mg/g, the removal percentages of Cu(II), Cr(VI), and Pb(II) were improved, respectively from 78.90 to 95.5 %, from 82.22 to 98.74 %, from 60.09 to 86.18 %.

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“…[40][41][42] It has some drawbacks that can limit its application, such as flammability, ease of desorption of highly volatile adsorbates, ineffectiveness for removal of oil, grease, and organic contaminants. [43][44] …”

Section: World Journal Of Pharmaceutical Researchmentioning

confidence: 99%

Removal of Dye Crystal Violet From Waste Water by Low Cost Natural Adsorbent (Ccns)

Borhade¹

2017

WJPR

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Adsorption study was conducted with dye crystal violet on natural low cost adsorbent charcoal of cashew nut shell. Adsorption of crystal violet dye was studied with the initial dye concentration at pH 6.0 at 298K, 303K, 308 K & 313 K. The adsorption study were carried out isothermally at four different temperatures. Freudlich isotherm and Langmuir isotherm were used to describe the equilibrium data and the result were discussed in details. The thermodynamic parameters such as standard free energy change, entropy change and enthalpy change were studied for charcoal of cashew nut shell. This values showed that the adsorption of crystal violet on charcoal of cashew nut shell was a spontaneous and endothermic process.

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Adsorption kinetics and isotherm parameters of naphthalene onto natural- and chemically modified bentonite from aqueous solutions

Cited by 55 publications

References 44 publications

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Removal Characteristics of Tanic Acid Adsorbed on MIEX Resin

Effects of Bentonite Activation Methods on Chitosan Loading Capacity

Removal of Dye Crystal Violet From Waste Water by Low Cost Natural Adsorbent (Ccns)

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