Polyacrylic acid-based and chitosan-based hydrogels for adsorption of cadmium: Equilibrium isotherm, kinetic and thermodynamic studies

Vilela, Pâmela Becalli; Matias, Caroline Aparecida; Dalalibera, Amanda; Becegato, Valter Antônio; Paulino, Alexandre Tadeu

doi:10.1016/j.jece.2019.103327

Cited by 133 publications

(43 citation statements)

References 52 publications

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“…Cadmium has been identified as a major heavy metal pollutant, with a proven high degree of toxicity at very low exposure levels, which can result in acute disorders and various chronic diseases by accumulation in living organisms [2]. This metal is discharged from central industries, like the mining, oil refineries, metal plating, batteries, alloy industries, smelting, phosphate fertilisers and pigments [3][4][5], resulting in cadmium contaminated water courses.…”

Section: Introductionmentioning

confidence: 99%

Non-linear adsorption characteristics of modified pine wood sawdust optimised for adsorption of Cd(II) from aqueous systems

Hashem

Badawy

Farag

et al. 2020

Journal of Environmental Chemical Engineering

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The facile modification of pinewood sawdust, with maleic acid, to produce a sorbent aimed at metal ion adsorption, was tested via the batch adsorption of Cd(II) ions from aqueous solution. The sorbent was characterized for the pH of zero point charge (pHZPC), spectroscopic evaluation of the surface functionalization, structural and morphological features. Factors affecting adsorption behavior, such as adsorbent dose, pH of solution, contact time and Cd(II) ion concentration were investigated. Results obtained show the adsorption rate to be comparatively fast, with equilibrium achieved after 35 min. Subsequent analysis, showed Langmuirian behavior and a monolayer adsorption capacity of 180.4 mg g -1 , at pH 6; while data derived from two-parameter and three-parameter isotherm models was evaluated using non-linear regression methods, with error analysis, to determine the most appropriate model and allow prediction of optimum parameters. The Sips isotherm model proved the most appropriate in describing the experimental data obtained in the study; with a low level of heterogeneity in the adsorption sites occupied suggesting the interaction of the metal ions

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Section: Introductionmentioning

confidence: 99%

Non-linear adsorption characteristics of modified pine wood sawdust optimised for adsorption of Cd(II) from aqueous systems

Hashem

Badawy

Farag

et al. 2020

Journal of Environmental Chemical Engineering

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“…The effect of temperature on adsorption processes is determined through the following relations (Eq. 12 ) 65 , 66 : and the van’t Hoff equation, given as Eq. ( 13 ): where K (L/mol) is from the Langmuir equation and has units of liters per mole.…”

Section: Adsorption Studiesmentioning

confidence: 99%

Enhanced heavy metal removal from an aqueous environment using an eco-friendly and sustainable adsorbent

Zhang

et al. 2020

Sci Rep

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Thiol-lignocellulose sodium bentonite (TLSB) nanocomposites can effectively remove heavy metals from aqueous solutions. TLSB was formed by using –SH group-modified lignocellulose as a raw material, which was intercalated into the interlayers of hierarchical sodium bentonite. Characterization of TLSB was then performed with BET, FTIR, XRD, TGA, PZC, SEM, and TEM analyses. The results indicated that thiol-lignocellulose molecules may have different influences on the physicochemical properties of sodium bentonite, and an intercalated–exfoliated structure was successfully formed. The TLSB nanocomposite was subsequently investigated to validate its adsorption and desorption capacities for the zinc subgroup ions Zn(II), Cd(II) and Hg(II). The optimum adsorption parameters were determined based on the TLSB nanocomposite dosage, concentration of zinc subgroup ions, solution pH, adsorption temperature and adsorption time. The results revealed that the maximum adsorption capacity onto TLSB was 357.29 mg/g for Zn(II), 458.32 mg/g for Cd(II) and 208.12 mg/g for Hg(II). The adsorption kinetics were explained by the pseudo-second-order model, and the adsorption isotherm conformed to the Langmuir model, implying that the dominant chemical adsorption mechanism on TLSB is monolayer coverage. Thermodynamic studies suggested that the adsorption is spontaneous and endothermic. Desorption and regeneration experiments revealed that TLSB could be desorbed with HCl to recover Zn(II) and Cd(II) and with HNO3 to recover Hg(II) after several consecutive adsorption/desorption cycles. The adsorption mechanism was investigated through FTIR, EDX and SEM, which demonstrated that the introduction of thiol groups improved the adsorption capacity. All of these results suggested that TLSB is an eco-friendly and sustainable adsorbent for the extraction of Zn(II), Cd(II) and Hg(II) ions in aqueous media.

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“…62 The value of E calculated by D-R model is higher than 8 kJ/mol (8.99 kJ/mol) representative of the chemisorption of cadmium on NH 2 /SBA-15/NTAA. 6,64 The results of some researches for Cd(II) adsorption on E. prolifera biochar modified with different chemical reagents 63 and cadmium uptake on polyacrylic acid-based and chitosan-based hydrogels 65 proved that the chemical adsorption is the controlling step for the cadmium adsorption process.…”

Section: Effect Of Temperature and Thermodynamic Studymentioning

confidence: 99%

Cadmium cation uptake through amine and acid post‐functionalized Santa Barbara Amorphous materials; comprehensive adsorption studies

Binaeian

Esfandyari

Valipour

et al. 2020

Env Prog and Sustain Energy

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In this research, a novel adsorbent, nitrilotriacetic acid anhydride (NTAA) and 3‐aminopropyltriethoxysilane (APTES) modified Santa Barbara Amorphous materials (SBA‐15) as a mesoporous silica was synthesized and applied for the adsorption of cadmium solution. X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, nitrogen adsorption–desorption isotherms and Fourier transform infrared analysis were used. The adsorption experiments were performed during batch system containing different concentrations of cadmium solution (60–120 mg/L) in pH range of 2–10, adsorbent dosage of 100–600 mg/L with contact time interval of 15–120 min. The maximum cadmium removal was achieved at pH 6 with 250 mg/L of adsorbent after 60 min. The proposed mechanisms for the removal and capture of Cd+2 ions by adsorbent are electrostatic interactions and chelation. The equilibrium studies prove that the experimental data are compatible with the Langmuir isotherm model well with the maximum adsorption capacity of 500 mg/g. Kinetic and thermodynamic studies also indicate that pseudo‐second order kinetic model is the predominant model and the adsorption process is exothermic. This study reveals a high capability of novel nano‐adsorbent for the efficient removal of hazardous heavy metal cations and anions from wastewater.

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Polyacrylic acid-based and chitosan-based hydrogels for adsorption of cadmium: Equilibrium isotherm, kinetic and thermodynamic studies

Cited by 133 publications

References 52 publications

Non-linear adsorption characteristics of modified pine wood sawdust optimised for adsorption of Cd(II) from aqueous systems

Non-linear adsorption characteristics of modified pine wood sawdust optimised for adsorption of Cd(II) from aqueous systems

Enhanced heavy metal removal from an aqueous environment using an eco-friendly and sustainable adsorbent

Cadmium cation uptake through amine and acid post‐functionalized Santa Barbara Amorphous materials; comprehensive adsorption studies

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