Kinetics and equilibrium models for the sorption of tributyltin to nZnO, activated carbon and nZnO/activated carbon composite in artificial seawater

Ayanda, Olushola Sunday; Fatoki, Olalekan S; Adekola, Folahan A.; Ximba, Bhekumusa J

doi:10.1016/j.marpolbul.2013.04.001

Cited by 26 publications

(15 citation statements)

References 20 publications

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“…It is well known that temperature plays an important role in adsorption. The results of the effect of adsorption temperature (ranged from 298 to 318 K) are shown in Table , and the thermodynamic parameters were predicted by using the following equations:

K_{c} = \frac{C_{A}}{C_{e}}

Δ G ° = - R T \ln K_{c}

\ln K_{c} = - \frac{Δ H °}{R T} + \frac{Δ S °}{R}

where C A is the concentration of Pb(II) adsorbed on the adsorbent, while C e represent the equilibrium concentration of Pb(II) ions. K c is the thermodynamic equilibrium constant .…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of EDTA‐functionalized chitosan magnetic adsorbent for removal of Pb(II)

Tan

Peng

Liu

et al. 2015

J of Applied Polymer Sci

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A novel magnetic adsorbent (EDTA/chitosan/PMMS) was facilely prepared by reacting chitosan with EDTA anhydride in presence of PEI-coated magnetic microspheres. The as-synthesized EDTA/chitosan/PMMS was characterized by XRD, SEM, TGA, FT-IR, and VSM, and then employed in removal of heavy metals of Pb(II) from aqueous solution. The results of the batch adsorption experiments revealed that the adsorbents had extremely high uptake capacities for Pb(II) in the pH range of 2 to 5.5, and the adsorption kinetics for EDTA/chitosan/PMMS was consistent with the pseudo-second-order kinetic model. Moreover, its equilibrium data were fitted with the Langmuir isothermal model well, which indicated that the adsorption mechanism was a homogeneous monolayer chemisorptions process. The maximum adsorption capacity of EDTA/chitosan/PMMS for Pb(II) was found to be 210 mg g 21 at pH 4 (308C), and further reuse experiments results suggested that EDTA/chitosan/PMMS could be a potential recyclable magnetic adsorbent in the practical wastewater treatment.

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K_{c} = \frac{C_{A}}{C_{e}}

Δ G ° = - R T \ln K_{c}

\ln K_{c} = - \frac{Δ H °}{R T} + \frac{Δ S °}{R}

where C A is the concentration of Pb(II) adsorbed on the adsorbent, while C e represent the equilibrium concentration of Pb(II) ions. K c is the thermodynamic equilibrium constant .…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of EDTA‐functionalized chitosan magnetic adsorbent for removal of Pb(II)

Tan

Peng

Liu

et al. 2015

J of Applied Polymer Sci

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“…The slope and intercept are 1=b and 1=b lnðabÞ, respectively. The 1/b value reflects the number of sites available for adsorption whereas the value of 1/b ln(ab) indicates the adsorption quantity when ln(t) equals to zero (Ayanda et al 2013;Ahmad et al 2014b).…”

Section: The Elovich Modelmentioning

confidence: 99%

“…where q t is the amount of adsorbate per unit mass of sorbent, k is a constant, t is time, and v is a positive constant (\1). The parameters v and k were determined from slope and intercept of a linear plot of log (q t ) versus log (t) (Ayanda et al 2013).…”

Section: The Fractional Powermentioning

confidence: 99%

A novel zerovalent manganese for removal of copper ions: synthesis, characterization and adsorption studies

2015

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Synthesis of nanoscale zerovalent manganese (nZVMn) by chemical reduction was carried out in a single pot system under inert environment. nZVMn was characterized using a combination of analytical techniques: Ultraviolet-Visible Spectroscopy, Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy, Energy Dispersive X-ray, BET surface area and Point of Zero Charge. The adsorption physicochemical factors: pH, contact time, adsorbent dose, agitation speed, initial copper ion concentration and temperature were optimized. The kinetic data fitted better to Pseudo second-order, Elovich, fractional power and intraparticle diffusion models and their validity was tested by three statistical models: sum of square error, Chi-square (v 2) and normalized standard deviation (Dq). Seven of the two-parameter isotherm models [Freundlich, Langmuir, Temkin, Dubinin-Kaganer-Raduskevich (DKR), Halsey, Harkin-Jura and Flory-Huggins] were used to analyse the equilibrium adsorption data. The Langmuir monolayer adsorption capacity (Q max = 181.818 mg/g) obtained is greater than other those of nano-adsorbents utilized in adsorption of copper ions. The equilibrium adsorption data were better described by Langmuir, Freundlich, Temkin, DKR and Halsey isotherm models considering their coefficient of regression (R 2 [ 0.90). The values of the thermodynamic parameters: standard enthalpy change DH°(?50.27848 kJ mol-1), standard entropy change DS°(203.5724 J mol-1 K-1) and the Gibbs free energy change DG°revealed that the adsorption process was feasible, spontaneous, and endothermic in nature. The performance of this novel nanoscale zerovalent manganese (nZVMn) suggested that it has a great potential for effective removal of copper ions from aqueous solution.

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“…ZnO micro/nano materials were also hydrothermally grown on activated carbon cloth and used as electrodes in a flow cell for brackish water desalination by capacitive deionization (Myint et al, 2014). In addition, the nano ZnO/activated carbon composite has been used for tributyltin removal from seawater (Ayanda et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Activated Carbon from Eggshell Membranes Prepared Using Sodium Acetate and Zinc Metal Activation

Mopoung¹,

Jitchaijaroenkul²

2017

American Journal of Applied Sciences

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The eggshell membranes of ducks and hens were carbonized or activated with 4 wt% sodium acetate or zinc at 400-600°C. The carbonized or activated products were characterized by SEM-EDS, TEM, FTIR and XRD. It was found that the suitable activation temperature for eggshell membranes is 500°C with 30.03-35.26% yield. The activation performance of CH 3 COONa for eggshell membrane activated carbon production was higher than that of Zn metal. The CO 3 2-, Ca-O, C=C, Na-O and C-O functional groups have been formed on the surface of eggshell membrane activated carbon materials during both CH 3 COONa and Zn activation. Furthermore, CaO, MgO, Na 2 O and ZnO have also accumulated on eggshell membrane activated carbon materials with high content and regular dispersion. It was shown that the particles on the duck eggshell membrane activated carbon formed with Zn had weaker attachment on the surface than for duck eggshell membrane activated carbon formed with CH 3 COONa at same temperature. The XRD and TEM results revealed that the eggshell membrane activated carbons consist of an amorphous carbon matrix with some disordered graphite carbon matrix, spherical particles and nanofiber.

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Kinetics and equilibrium models for the sorption of tributyltin to nZnO, activated carbon and nZnO/activated carbon composite in artificial seawater

Cited by 26 publications

References 20 publications

Facile preparation of EDTA‐functionalized chitosan magnetic adsorbent for removal of Pb(II)

Facile preparation of EDTA‐functionalized chitosan magnetic adsorbent for removal of Pb(II)

A novel zerovalent manganese for removal of copper ions: synthesis, characterization and adsorption studies

Characterization of Activated Carbon from Eggshell Membranes Prepared Using Sodium Acetate and Zinc Metal Activation

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