Removal of pollutants from aqueous product of Co-hydrothermal liquefaction: Adsorption and isotherm studies

Adedeji, Oluwayinka M.; Jahan, Kauser

doi:10.1016/j.chemosphere.2023.138165

“…The Temkin adsorption isotherm model considers the interaction between the adsorbent and adsorbate, regardless of the analyte concentration being high or low. However, the model is only valid for an intermediate concentration range . The linear form of the isotherm is expressed by eq : q e 0.25em = 0.25em R T b 0.25em ln .25em K t 0.25em + 0.25em R T b 0.25em ln .25em C e where K t is the equilibrium binding constant (L/g), which represents the maximum binding energy, b is the heat of adsorption (J/mol), T is the temperature in Kelvin, while R is the universal gas constant (8.314 J/K/mol).…”

Section: Resultsmentioning

confidence: 99%

“…However, the model is only valid for an intermediate concentration range . The linear form of the isotherm is expressed by eq : q e 0.25em = 0.25em R T b 0.25em ln .25em K t 0.25em + 0.25em R T b 0.25em ln .25em C e where K t is the equilibrium binding constant (L/g), which represents the maximum binding energy, b is the heat of adsorption (J/mol), T is the temperature in Kelvin, while R is the universal gas constant (8.314 J/K/mol). The plot of q e vs In C e produces a slope and an intercept for the derivation of b and K t , respectively.…”

Section: Resultsmentioning

confidence: 99%

Mechanistic Understanding of Sieving Lithium Ions Using a Biobased Sorbent Technology for Sustainable Lithium Reclamation and Cleansing Brines

Adrah,

Dawood,

Rathnayake

2024

ACS Omega

0

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Low-cost environmentally benign materials that can be produced in a large scale to extract lithium from brine resources could drive the lithium market toward a clean technology with high lithium recovery and production. Herein, we have investigated the utilization of a novel, environmentally benign, and low-cost biobased sorbent for the extraction of lithium from lithium-rich solutions. This biobased molecular sieving sorbent, iron(III)-tannate (Fe(III)-TA), belongs to a novel class of coordination polymer frameworks derived from a natural polyphenol�tannic acid (TA)�coordinated with iron(III) metal cations. Its lithium adsorption and kinetic isotherm studies conducted using lithium-rich aqueous solutions confirm the sorbent's dual function for lithium sieving via physisorption, chemisorption, and mass transfer diffusion processes. The adsorption equilibrium and kinetic isotherm models combined with the external and internal mass transfer diffusion models reveal a mechanistic pathway for lithium-ion adsorption. Aiding by forming a fluid film for external mass transfer diffusion of lithium ions, analytes adsorb onto the sorbent surface via physisorption and chemisorption followed by the internal mass transfer diffusion, occupying lithium ions in the sorbent's pores. The lithium adsorption efficiency studies conducted for brines with different concentrations of interference alkali and alkaline cations evidence that the sorbent's affinity for lithium ions strongly depends on the analyte concentration. The results evidence that the sorbent has the ability to lower the brine's salinity and significantly reduces the ratios of Mg/Li and Ca/Li by 4fold and 10-fold, respectively, yielding lithium-rich solutions. Thus, implementing this innovative biobased sorbent technology as an add-in step into traditional lithium extraction and refining processes, one can design a cost-effective pathway to yield lithium-rich leachate by reducing the Mg/Li and Ca/Li ratio. Nonetheless, the present work demonstrates that Fe(III)-tannate is an effective multifunctional sorbent for sieving lithium from lithium-rich aqueous solutions as well as for desalinating brine resources to recover usable water. Thus, this biobased sorbent offers the possibility of effective application of lithium reclamation and remediation of brine, mitigating the environmental impact of brine discharge and large volume of freshwater usage for lithium extraction and refining.

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“…The adsorption of MB onto magnetic Mg 0.4 Co 0.5 Zn 0.1 Fe 2 O 4 nanoparticles was a monolayer and multilayer chemical adsorption mechanism. Moreover, B of the Temkin model was positive, indicating that the adsorption was an exothermic reaction [64–66].…”

Section: Resultsmentioning

confidence: 99%

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic Mg_xCo_yZn_(1-x-y)Fe₂O₄ Nanoparticles

Lv

¹

,

Yang

²

,

Han

³

et al. 2023

Adsorption Science & Technology

1

0

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Magnetic MgxCoyZn(1-x-y)Fe2O4 nanoparticles were successfully prepared by the rapid combustion approach, and SEM, XRD, VSM, EDX, and FTIR techniques were applied for their characterization. The influence of the element ratios (Mg2+, Co2+, and Zn2+) in magnetic MgxCoyZn(1-x-y)Fe2O4 nanoparticles on their properties was explored. To acquire a larger specific surface area for better adsorption of methyl blue (MB), magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles calcined at 400°C for 2 h with 25 mL anhydrous ethanol were selected, and their average particle size and the saturation magnetization were about 81.3 nm and 13.5 emu·g-1, respectively. Adsorption kinetics models and adsorption isotherm models were applied to research the adsorption characteristics of MB onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles. The pseudo-second-order kinetics model ( R 2 > 0.99 ) and Temkin isotherm model ( R 2 = 0.9887 ) were the most consistent with the data, indicating that the adsorption was the chemical multilayer adsorption mechanism, and the process was an exothermic reaction. The E of the Dubinin-Radushkevich (D-R) isotherm model was 0.2347 KJ·mol-1, indicating the adsorption involved physical adsorption besides chemical adsorption. The Δ G 0 and Δ H 0 ( Δ H 0 = − 10.38 KJ·mol-1) of the adsorption process of MB adsorbed onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles measured through the thermodynamic experiment were both less than 0, which proved that the process was a spontaneous exothermic reaction. The adsorption capacity of MB onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles increased with the pH of MB solution increasing from 2 to 4 at room temperature, and it had no significant change when the pH of MB solution was 4-12, while the relative removal rate was 98.75% of the first one after 2 cycles. The electrochemical impedance spectroscopy (EIS) and the cyclic voltammetry (CV) data further demonstrated that MB was adsorbed onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles.

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“…In the Langmuir isotherm, 1/qe is linearly plotted against vs 1/Ce. Moreover, KL and qm can be obtained from the inverse of the slope and the intercept respectively [46].…”

Section: Calculation Of Batch Experiments and Adsorption Isotherm Modelsmentioning

confidence: 99%

“…( 8), adsorbate is quite difficult to adsorb onto the surface. The Freundlich model describes the physical adsorption or the monolayer adsorption at which about 50% adsorption sites are occupied [44,46,48].…”

Section: Calculation Of Batch Experiments and Adsorption Isotherm Modelsmentioning

confidence: 99%

Experimental study on the electro oxidation-adsorption process for removing chlorate from sewage treatment plant effluent

Park

¹

,

Han

²

,

Oh

³

2023

Preprint

0

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Wastewater treatment plants face the challenge of controlling disinfection by-products, such as carcinogenic trihalomethanes, which are formed when disinfectants react with organic compounds and humic substances in water sources. To ensure the prevention of water pollution, effective control measures must be implemented to mitigate the release of these harmful by-products into water bodies. This study focused on the application of an electrooxidation-adsorption hybrid process for the treatment of chlorate, a prevalent disinfection by-product found in sewage plant effluent. The investigation aimed to evaluate the impact of various parameters including current density, empty bed contact time (EBCT), granular activated carbon (GAC) injection amount, electrode installation spacing, and pH on the treatment efficiency. Optimal operating conditions were determined, including a current density of 75 A/m2 , an EBCT of 5 minutes, a GAC injection amount of 2.0 w/v (%), an electrode installation spacing of 2 cm, and a pH of 2. These conditions demonstrated effective removal of disinfection by-products, even in the presence of coexisting pollutants. The findings highlight the viability of the electrooxidation-adsorption process as a promising approach for the treatment of disinfection by-products in sewage treatment plant effluent. This research contributes to the development of efficient strategies for mitigating the environmental impact of wastewater treatment processes and ensuring the protection of public water resources.

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Removal of pollutants from aqueous product of Co-hydrothermal liquefaction: Adsorption and isotherm studies

Cited by 59 publications

References 38 publications

Mechanistic Understanding of Sieving Lithium Ions Using a Biobased Sorbent Technology for Sustainable Lithium Reclamation and Cleansing Brines

Mechanistic Understanding of Sieving Lithium Ions Using a Biobased Sorbent Technology for Sustainable Lithium Reclamation and Cleansing Brines

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic Mg_xCo_yZn_(1-x-y)Fe₂O₄ Nanoparticles

Experimental study on the electro oxidation-adsorption process for removing chlorate from sewage treatment plant effluent

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Removal of pollutants from aqueous product of Co-hydrothermal liquefaction: Adsorption and isotherm studies

Cited by 59 publications

References 38 publications

Mechanistic Understanding of Sieving Lithium Ions Using a Biobased Sorbent Technology for Sustainable Lithium Reclamation and Cleansing Brines

Mechanistic Understanding of Sieving Lithium Ions Using a Biobased Sorbent Technology for Sustainable Lithium Reclamation and Cleansing Brines

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic MgxCoyZn(1-x-y)Fe2O4 Nanoparticles

Experimental study on the electro oxidation-adsorption process for removing chlorate from sewage treatment plant effluent

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Product

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About

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic Mg_xCo_yZn_(1-x-y)Fe₂O₄ Nanoparticles