Thermodynamics Approach in the Adsorption of Heavy Metals

Al-Anber, Mohammed A.

doi:10.5772/21326

Cited by 22 publications

(12 citation statements)

References 39 publications

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“…In addition, the magnitude of ∆H, the binding for Cu 2+ indicates that a reaction occurs thorough ion exchange whereas Pb 2+ binding occurs via chemisorption. According to the literature, the sorption processes with ∆H ranging from 8.0 to 16.0 kJ/mol correspond to ion exchange whereas ∆H values greater than 40 kJ/mol are attributed to chemisorption which supports the formation of a PbS compound after sorption, [44]. For chemisorption, the formation of a chemical bond occurs between the adsorbate and adsorbent, which is shown in Figure 6 B the formation of the PbS after reaction between Pb 2+ with the TiS2.…”

Section: Capacitance and Thermodynamics Studymentioning

confidence: 78%

Investigation into the thermodynamics and kinetics of the binding of Cu2+ and Pb2+ to TiS2 nanoparticles synthesized using a solvothermal process

Cantu

Valle

Flores

et al. 2019

Journal of Environmental Chemical Engineering

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Section: Capacitance and Thermodynamics Studymentioning

confidence: 78%

Investigation into the thermodynamics and kinetics of the binding of Cu2+ and Pb2+ to TiS2 nanoparticles synthesized using a solvothermal process

Cantu

Valle

Flores

et al. 2019

Journal of Environmental Chemical Engineering

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“…Thermodynamic parameters such as changes in free energy change (∆G), enthalpy (∆H) and entropy (∆S) were estimated from the data using the Eqns. 9-12 (Boparai et al, 2011, Al-Anber 2011: In Eqn. 12, M is the molecular weight of the adsorbed species, and C is the concentration of the solution (Omer et al (2018)).…”

Section: ) Thermodynamic Studiesmentioning

confidence: 99%

Enhancing adsorption capacity of a kaolinite mineral through acid activation and manual blending with a 2:1 clay

Abu,

Adegoke,

Odebunmi

et al. 2024

Nig. J. Technol. Dev.

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The efficiencies of raw and modified kaolinite mineral in removing selected heavy metal ions from their respective aqueous solutions were investigated. The mineral was modified through two different methods; i) activation with HNO3, H2SO4, H3PO4, CH3COOH and C2H2O4 acids to form NK, SK, PK, AK and OK acid activated clays respectively and ii) preparations of 3:1 and 1:1 Kaolinite: Bentonite blends to form UBK and EBK composites respectively through manual blending. The adsorbents were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infra-Red Spectroscopy (FTIR) and Brunauer Emmett Teller (BET) analysis for surface area determination. The surface area increased in some of the modified clays from 114.9457 m2/g (RK) to 288.685 m2/g (EBK), 205.92 m2/g (UBK), 162.227 m2/g (NK), 151.335 m2/g (SK), and 115.837 m2/g (OK) but reduced to 113.872 m2/g (PK) and 112.865 m2/g (AK) after modification. Adsorption studies were subsequently conducted out to remove Pb2+, Cd2+ and Ni2+ ions from synthetic solutions. Pb2+ was found to be most removed (383.5 mg g-1 (RK), 591.13 mg g-1 (EBK), 576.61 mg g-1 (UBK), 475 mg g-1 (NK), 450 mg g-1 (SK), and 425 mg g-1 (PK), 375 mg g-1 (OK) and 375 mg g-1 (AK)) with highest removals on the composites.

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“…This observation is analyzed in more detail in the next section dealing with the thermodynamics of the adsorption process. The experimental data were interpolated by using Freundlich and Langmuir isotherm equations (Equations ( 4) and (5), respectively), which are the most frequently used models in this sense [46][47][48][49][50]:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Thus, the Langmuir approach only considers the formation of a monolayer of adsorbate onto the outer surface of the adsorbent. In turn, the Freundlich isotherm considers both the initial adsorption onto the heterogeneous surface as well as the condensation effect occurring due to adsorbate-adsorbate interaction [50]. Previous research has shown that the non-linear regression methods were more precise in estimating the model parameters compared to the linear regression techniques employed for the same purpose [45].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Oxidized Biomass and Its Usage as Adsorbent for Removal of Heavy Metal Ions from Aqueous Solutions

Condurache¹,

Cojocaru²,

Samoilă³

et al. 2022

Molecules

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Nowadays, very coarse wool fibers are considered waste biomass and are discarded at random or burned. Therefore, it is of actual interest to valorize coarse wool fibers as utile products. In this sense, we report herein an environmentally-friendly process for the preparation of a new material based on oxidized wool fibers and designed for efficient adsorption of heavy metals from wastewater. The morphology and the structure of the obtained product were characterized by scanning electron microscopy (SEM) coupled with an X-ray energy-dispersive module (EDX) and by Fourier-transform infrared spectroscopy (FTIR). Likewise, the performances of the oxidized wool fibers for the adsorption of heavy metal cations (Cu2+, Cd2+, Pb2+) from aqueous solutions were tested. The adsorption kinetics data were analyzed by applying the pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models. The equilibrium of the adsorption process was investigated by using the Freundlich and Langmuir isotherm models. According to the Langmuir isotherms registered at 300 K, the maximum adsorption capacities of the oxidized wool were found to increase from Cu2+ (9.41 mg/g) and Cd2+ (10.42 mg/g) to Pb2+ (30.71 mg/g). Consequently, the removal efficiency of metal ions was found to vary in the range of 96.8–99.7%. The thermodynamic parameters (e.g., enthalpy, entropy, and Gibbs free energy) were calculated and discussed.

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Thermodynamics Approach in the Adsorption of Heavy Metals

Cited by 22 publications

References 39 publications

Investigation into the thermodynamics and kinetics of the binding of Cu2+ and Pb2+ to TiS2 nanoparticles synthesized using a solvothermal process

Investigation into the thermodynamics and kinetics of the binding of Cu2+ and Pb2+ to TiS2 nanoparticles synthesized using a solvothermal process

Enhancing adsorption capacity of a kaolinite mineral through acid activation and manual blending with a 2:1 clay

Oxidized Biomass and Its Usage as Adsorbent for Removal of Heavy Metal Ions from Aqueous Solutions

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