Thermodynamic, kinetic and spectroscopic investigation of arsenite adsorption mechanism on pine cone-magnetite composite

Ouma, Linda; Naidoo, Eliazer Bobby; Ofomaja, Augustine E.

doi:10.1016/j.jece.2018.08.035

Cited by 37 publications

(18 citation statements)

References 62 publications

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“…Besides, symmetric and asymmetric stretching modes of the As-O bonds in the FTIR spectrum can be observed at 878 and 907 cm −1 , respectively [33]. Moreover, the bands at 844-855 cm −1 are assigned to the As-O vibration of an inner-sphere Al-O-As complex [33,35,36]. These results indicate that the mechanisms involved on As(V) sorption onto Al-GS biosorbent are those related to the interactions between arsenate ion and aluminum on the surface of the guava seeds, along with the active sites on the lignocellulosic structure of GSs.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 95%

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Ramos-Vargas

Alfaro-Cuevas-Villanueva

Huirache–Acuña

et al. 2018

Applied Sciences

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Featured Application: The adsorbent materials under study could have a potential use for the decontamination of groundwater with high levels of arsenic and fluoride. It could be particularly suitable for application in water treatment for small communities.Abstract: The contamination of groundwater by arsenic and fluoride is a major problem worldwide, causing diseases in the population that uses these waters for their consumption. Therefore, the removal of these types of pollutants from groundwater is a very important issue. In this work, the removal of arsenate and fluoride from aqueous solutions by using aluminum-modified guava seeds (Al-GSs) was evaluated. Batch-type adsorption experiments were carried out with aqueous solutions of As(V) and F − and Al-GSs. The kinetic and equilibrium parameters of adsorption were determined, as well as the effects of adsorbent dose and pH. The adsorbent was characterized by scanning electron microscopy and infrared spectroscopy in order to determine its morphology and the functional groups present in the material. The results showed that hydroxyl and carboxyl are the main groups involved in the adsorption of As(V) and F − . The fluoride adsorption kinetics indicate that the equilibrium time was reached at 150 min and it can be described by the Lagergren model, while for As(V) the equilibrium time was lower (120 min) and the kinetic data were fitted well to the pseudo-second-order model. The Langmuir-Freundlich model can describe the adsorption equilibrium data in all cases. The fluoride adsorption capacity by Al-GS was 0.3445 mg/g, and for As(V) it was 4 mg/g. It can be established that the removal of arsenates and fluoride in Al-GSs is due to chemisorption on a heterogeneous surface.then consumption of these waters may lead to dental fluorosis. From 3 to 6 mg/L of fluoride, skeletal fluorosis may appear, and at higher fluoride levels (>10 mg/L) crippling skeletal fluorosis can be developed [3,4]; these types of fluorosis are irreversible, and no treatment can eliminate symptoms definitively. Keeping fluoride intake within safe levels is the only way to prevent these diseases [5,6]. People in several countries around the world are facing problems of high fluoride levels in drinking water; these problems are more severe and intense depending on different factors, like the geographical and economic status of the affected communities [7]. The World Health Organization (WHO) guidelines for drinking water quality have established that, for areas with a warm climate, fluoride concentration in water should remain below 1 mg/L, while this concentration could be raised up to 1.2 mg/ for areas with a cold climate [3]. In developing countries this problem is more acute, particularly in small urban communities and rural areas [5,8].On the other hand, arsenic content in drinking water is also a worldwide concern, and it represents a great threat to human health. Levels above 10 µg/L of arsenic, which is the maximum level recommended by the WHO, have been reported in drinking water from se...

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Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 95%

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Ramos-Vargas

Alfaro-Cuevas-Villanueva

Huirache–Acuña

et al. 2018

Applied Sciences

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“…The intraparticle diffusion stage was accompanied by an important increase in the boundary layer thickness (C 2 ), whose values were below adsorption at equilibrium ( q e ), so that a third equilibrium stage was actually not observed. Conversely, arsenite adsorption on a pine cone-magnetite composite presented a first stage indicating bulk diffusion with a straight line intercepting the origin, followed by a linear section which represents intraparticle diffusion and lastly a plateau section representing equilibrium [18]. In summary and in agreement with our findings, the adsorption mechanism is determined by three consecutive steps, namely 1.-external or film mass transfer of solute molecules from the solution bulk to the sorbent particle surface, succeeded by 2.-diffusion within the particle internal structure to the sorption sites where 3.-the immeasurable rapid uptake occurs, so that film mass transfer and intraparticle diffusion remain the rate determining steps [33].…”

Section: Intraparticle Diffusion (Ipd) Modelmentioning

confidence: 98%

“…In spite of erratic adsorption rate behavior, the calculated adsorption at equilibrium was found a little lower but much approximated to experimental data than that recorded with the linear model; hence, smaller Chi-square values than Chi square tabular values were obtained. Accordingly, the PFO nonlinear model properly predicted the equilibrium adsorption capacity for adsorption kinetics of arsenate onto magnetic iron-manganese biochar composites [57], arsenic(III/V) on nano-iron ion enrich material [58], arsenite on pine cone-magnetite composite [18], and arsenic(III/V) on magnetic Fe 3 O 4 @CuO nanocomposite assembled on graphene oxide sheets [59]. Hence, the kinetics of As(III) adsorption onto ferrite NPs might be reliably described by the PFO nonlinear model.…”

Section: Pseudo-first-order (Pfo) Modelmentioning

confidence: 99%

“…Even though the PSO model has been advised for low initial solute concentrations [30], the kinetics of [18,59,60]. The PSO expression has been extensively used to describe chemisorption involving valency forces through the sharing or exchange of electrons between the adsorbent and adsorbate as covalent forces and ion exchange [32].…”

Section: Pseudo-second-order (Pso) Modelmentioning

confidence: 99%

“…Accordingly, adsorption is one of the most accepted methods for arsenic removal from water and it has been currently considered as an efficient and economical method for water treatment [8]. Last are statements supported by successful arsenic removal from water using iron oxide NPs such as magnetite [9][10][11], mixed magnetite/maghemite [12], hematite [13,14], manganese/cobalt ferrite [15,16], nickel ferrite [17], and magnetic composites [6,18]. Therein, efforts have been constantly done toward the functionalization of magnetic materials in order to obtain nanocomposites with an enhanced adsorption capacity of aqueous arsenic species [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

et al. 2019

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In the present work, we analyzed the linear and nonlinear model suitabilities for adsorption data from aqueous As(III) removal by manganese ferrite nanoparticles (NPs). Hence, As(III) adsorption onto ferrite NPs was formerly analyzed by the intraparticle diffusion model (IPD). Then, adsorption kinetics was described by the pseudo-first-order (PFO), pseudosecond-order (PSO), and Elovich models, while equilibrium adsorption was fitted to the Freundlich and Langmuir isotherms. Linear and nonlinear kinetic and isotherm models were solved and compared. The nonlinear data fitting was applied through the lsqcurvefit user-defined function (Matlab ver. 7.10.0). The initial adsorption rate was influenced by intraparticle diffusion and surface or film diffusion from the arsenic bulk solution to ferrite NPs, according to the IPD model. Adsorption kinetics of As(III) on manganese ferrite NPs was better described by the PSO model, followed by the Elovich model and then the PFO model. Equilibrium adsorption data were only worthily described by the Freundlich isotherm model. While the PSO, Elovich and Freundlich linear models showed even better fit than the nonlinear models, determinant bias was depicted for the PFO and Langmuir linear models. Thus, to use nonlinear adsorption models is highly advisable, having the Matlab lsqcurvefit function been proven very useful to face such task.

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Environmentally Friendly Adsorbents

Siswoyo

Dai

Mori

et al. 2022

The Handbook of Environmental Chemistry

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Thermodynamic, kinetic and spectroscopic investigation of arsenite adsorption mechanism on pine cone-magnetite composite

Cited by 37 publications

References 62 publications

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

Environmentally Friendly Adsorbents

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