Sorption of toxic metals on sodium aluminosilicate (NAS)

Bhadoria, R. S.; Singh, B. B.; Tomar, Radha

doi:10.1016/j.desal.2009.11.016

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…If adsorption is exothermic, surroundings will be heated up and we expect higher entropy and a negative free energy change since a negative ∆H is larger than a positive -T∆S term. Increasing adsorptive removal of lead nitrate with increasing temperature shows that adsorption is endothermic 15 . So ∆H can be positive which also signifies low surface coverage and weak adsorbate-adsorbent interaction as evident from low K F and n values.…”

Section: Thermodynamic Equilibrium Constantsmentioning

confidence: 99%

Kinetic Studies of Adsorption Process of Zambian Kapiri Mposhi Zeolites

Xavier¹

2021

Orient. J. Chem

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Batch adsorption studies were done on aqueous solutions of Pb(NO3)2 at varying solute concentration, adsorbent dose, contact time, temperature, calcination temperatures and pH. Residual concentrations of the solute were found out using AAS and optimum conditions were studied. Adsorbent used in this study is locally available silicate rich mineral which closely resembles zeolites. The net negative charge on the framework of hydrated aluminosilicates is responsible for ion exchange property. Freundlich model was used to validate the results obtained from batch experiments plotting lnCe vs lnqe. Objective of this work is to study the kinetics of adsorption considering the interplay of particle diffusion in addition to proving the effectiveness as an adsorbent. A diffusion model also was also applied apart from kinetic model to analyze the experimental results more specifically. For maximizing the efficiency of the adsorption process and minimizing the time involved, variables like temperature, reactants and pH were manipulated using kinetic studies. It establishes the optimum reaction conditions for various experimental parameters in the process of adsorption.

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Section: Thermodynamic Equilibrium Constantsmentioning

confidence: 99%

Kinetic Studies of Adsorption Process of Zambian Kapiri Mposhi Zeolites

Xavier¹

2021

Orient. J. Chem

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“…Other methods used for removing hazardous metals from dissolved solutions include electrodialysis and precipitation [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Aziam,

Stefan,

Nouaa

et al. 2024

Nanomaterials

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The aim of this work is to characterize and evaluate the retention of Cu2+ and Ni2+ from single and binary systems by alginate–−Moroccan clay bio−composite with the utilization of calcium chloride as a cross−linking agent, using the ionotropic gelation method. The bio−nanocomposite was characterized by using a variety of techniques (SEM, EDX, XRD, and pHPZC). The efficiency of the adsorbent was investigated under different experimental conditions by varying parameters such as pH, initial concentration, and contact time. To demonstrate the adsorption kinetics, various kinetic models were tried and assessed, including pseudo−first−order, pseudo−second−order, intraparticle diffusion, and Elovich models. The research results show that the adsorption process of Cu2+ and Ni2+ metal ions follows a pseudo−second−order kinetic model, and the corresponding rate constants were identified. To evaluate the parameters related to the adsorption process in both single and binary systems, different mathematical models of isotherms, such as Langmuir, Freundlich, Temkin, and Dubinin–−Radushkevich, were investigated. The correlation coefficients obtained showed that the most suitable isotherm for describing this adsorption process is the Langmuir model. The process is considered to be physical and endothermic, as suggested by the positive values of ΔH° and ΔS°, indicating increased randomness at the solid/liquid interface during Cu2+ and Ni2+ adsorption. Furthermore, the spontaneity of the process is confirmed by the negative values of ∆G°. The bio−nanocomposite beads demonstrated a maximum adsorption capacity of 370.37 mg/g for Ni2+ and 454.54 mg/g for Cu2+ in the single system. In the binary system, the maximum adsorption capacities were observed to be 357.14 mg/g for Ni2+ and 370.37 mg/g for Cu2+. There is significant evidence for the use of alginate–−Moroccan clay bio−nanocomposite as a cost−effective alternative adsorbent for the efficient removal of metal ions in single and binary systems.

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Preparation of calix[4]arene-based sporopollenin and examination of its dichromate sorption ability

Sayın

Gübbük

2012

J Incl Phenom Macrocycl Chem

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Sorption of toxic metals on sodium aluminosilicate (NAS)

Cited by 11 publications

References 15 publications

Kinetic Studies of Adsorption Process of Zambian Kapiri Mposhi Zeolites

Kinetic Studies of Adsorption Process of Zambian Kapiri Mposhi Zeolites

Adsorption of Metal Ions from Single and Binary Aqueous Systems on Bio-Nanocomposite, Alginate-Clay

Preparation of calix[4]arene-based sporopollenin and examination of its dichromate sorption ability

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