Adsorption of heavy metals on natural zeolites: A review

Velarde, Lisbania; Nabavi, Mohammad Sadegh; Escalera, Edwin; Antti, Marta‐Lena; Akhtar, Farid

doi:10.1016/j.chemosphere.2023.138508

Cited by 179 publications

(61 citation statements)

References 187 publications

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“…The occurrence of lead in wastewater underscores a significant environmental and public health concern, given its high toxicity, bioaccumulation, and persistence in natural aquatic ecosystems. − Predominantly, lead-enriched wastewater mainly comes from metallurgical processes, particularly in the extraction of ores, where lead often coexists with zinc. Intriguingly, these lead–zinc ore bodies occasionally contain copper ion inclusions .…”

Section: Introductionmentioning

confidence: 99%

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Wang,

Wu,

Zhou

et al. 2024

Langmuir

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The coexistence of lead, zinc, and copper ions in wastewater constitutes an environmental challenge of pressing concern. This research delves into the preparation of innovative oxidation-doped conjugated microporous poly(aniline) frameworks, exploring their prospective efficacy in regulating lead ion adsorption from aqueous solutions. H 2 SO 4 −CMPTA demonstrates the capability to reach adsorption equilibrium within 15 min at a lead concentration of 50 ppm. Even at a lead concentration of 20 ppm, it still efficaciously attenuates these levels to sub-10 ppb, a value surpassing extant standard. H 2 SO 4 − CMPTA retains over 78.8% adsorption efficiency after six cycles. Analytical characterization coupled with computational calculations suggests that sulfate-coordinated nitrogen cationic structure plays a crucial role in adsorption. A deeper investigation reveals the cardinal role of electrostatic attraction and exclusive chelation adsorption underpinning the efficient capture of lead ions by doped sulfate ions. Intriguingly, in a mixed heavy metal solution containing lead, zinc, and copper ions, H 2 SO 4 −CMPTA exhibits an initial predilection toward zinc ions, yet an eventual ion-exchange adsorption gravitating toward lead ions was discerned, governed by the latter's superior binding energy. Our study elucidates a promising material as an efficacious tool for the remediation of aquatic environments tainted with lead contaminants.

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Section: Introductionmentioning

confidence: 99%

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Wang,

Wu,

Zhou

et al. 2024

Langmuir

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“…Chemical pollution of water bodies, together with the ensuing negative consequences for people’s wellness and environmental systems, are critical challenges that constitute an urgent risk to humanity’s future well-being. , The main causes and contributing aspects to the current issue of polluted water supply and its related environmental side effects are the uncontrolled, broadly distributed, and continuous discharge of polluted effluents that result from mining, agriculture, and manufacturing activities. , The potential existence of hazardous metals within aquatic environments, whether in the form of soluble ions or chemical compounds bound to additional chemicals, displays a substantial threat to both the aquatic ecosystem and the health of humans. , The aforementioned chemicals have been categorized as highly toxic, nonbiodegradable, and carcinogenic agents with a propensity for bioaccumulation in humans as well as animal organisms. − …”

Section: Introductionmentioning

confidence: 99%

Enhanced Retention of Cd(II) by Exfoliated Bentonite and Its Methoxy Form: Steric and Energetic Studies

Abukhadra,

Nasser,

El-Sherbeeny

et al. 2024

ACS Omega

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Synergistic studies were conducted to evaluate the retention potentiality of exfoliating bentonite (EXBEN) as well as its methanol hybridization derivative (Mth/EXBEN) toward Cd(II) ions to be able to verify the effects of the transformation processes. The adsorption characteristics were established by considering the steric and energetic aspects of the implemented advanced equilibrium simulation, specifically the monolayer model with a single energy level. Throughout the full saturation states, the adsorption characteristics of Cd(II) increased substantially to 363.7 mg/g following the methanol hybridized treatment in comparison to EXBEN (293.2 mg/g) as well as raw bentonite (BEN) (187.3 mg/g). The steric analysis indicated a significant rise in the levels of the active sites following the exfoliation procedure [retention site density (N m ) = 162.96 mg/g] and the chemical modification with methanol [retention site density (N m ) = 157.1 mg/g]. These findings clarify the improvement in the potential of Mth/EXBEN to eliminate Cd(II). Furthermore, each open site of Mth/EXBEN has the capacity to bind approximately three ions of Cd(II) in a vertically aligned manner. The energetic investigations, encompassing the Gaussian energy (less than 8 kJ/mol) plus the adsorption energy (less than 40 kJ/mol), provide evidence of the physical sequestration of Cd(II). This process may involve the collaborative impacts of dipole binding forces (ranging from 2 to 29 kJ/mol) and hydrogen binding (less than 30 kJ/mol). The measurable thermodynamic functions, particularly entropy, internal energy, and free enthalpy, corroborate the exothermic and spontaneous nature of Cd(II) retention by Mth/ EXBEN, as opposed to those by EXBEN and BE.

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“…1 Heavy-metal pollution, in particular, offers a significant concern to organism health because of its high toxicity, carcinogenicity, bioconcentration, and refractory decomposition, and human activities have been found to be the main reason for the increase of heavy-metal content in aquatic environments. [2][3][4] Heavymetal Pb is one of the three major heavy-metal pollutants, which is a heavy-metal element that seriously endangers human health, and will cause irreversible damage to the kidneys, heart and nerve center of the human body. 5,6 Traditional treatment methods include chemical precipitation, electrochemical removal, and so on, but there are drawbacks such as incomplete removal and toxic sludge; thus, new water pollution treatment technologies involve adsorption or catalytic degradation.…”

Section: Introductionmentioning

confidence: 99%

“…With modern economic and industrial technology breakthroughs, urban sprawl and water pollution have become worldwide issues that humanity must confront in the 21st century 1 . Heavy‐metal pollution, in particular, offers a significant concern to organism health because of its high toxicity, carcinogenicity, bioconcentration, and refractory decomposition, and human activities have been found to be the main reason for the increase of heavy‐metal content in aquatic environments 2–4 . Heavy‐metal Pb is one of the three major heavy‐metal pollutants, which is a heavy‐metal element that seriously endangers human health, and will cause irreversible damage to the kidneys, heart and nerve center of the human body 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of modified zeolite/chitosan composites and study on the adsorption performance of Pb²⁺

Du,

Sun,

Zhang

2023

Polymer Engineering & Sci

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As one of the most common pollutants in wastewater, heavy metals seriously threaten human health and survival, and among the current removal methods, the adsorption method has attracted the most attention because of its simple and safe operation. Zeolite is a substance with a unique spatial structure, cheap cost, and environmental friendliness. Zeolite is a substance with a unique spatial structure, cheap cost, and environmental friendliness. Due to its size and high surface area‐to‐volume ratio, zeolite exhibits excellent adsorption and ion exchange properties and is a promising adsorbent. In this paper, the modified zeolite chitosan composite film was prepared by solution method by dissolving chitosan in acetic acid solution as the solvent, and the effects of zeolite content, modifier type, initial pH, pore‐making agent, adsorption time, adsorption temperature, initial concentration, and feeding amount were studied. The optimal conditions for Pb2+ adsorption were 40% modified zeolite content, 293 K in 100 mg/L solution, a feeding amount of 1 g/L, pH = 5.5, and a removal rate of 96.6% in 24 h. The isotherm is consistent with the Langmuir adsorption model, which is manifested as single‐molecule chemical adsorption, and the highest saturated adsorption capacity is 139.6 mg/g. After five cycles, it still has a greater than 90% initial adsorption effect.Highlights Chitosan‐modified zeolite composite membranes are inexpensive. After adsorption, the sorbent is easy to recover.

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Adsorption of heavy metals on natural zeolites: A review

Cited by 179 publications

References 187 publications

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Enhanced Retention of Cd(II) by Exfoliated Bentonite and Its Methoxy Form: Steric and Energetic Studies

Preparation of modified zeolite/chitosan composites and study on the adsorption performance of Pb²⁺

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Adsorption of heavy metals on natural zeolites: A review

Cited by 179 publications

References 187 publications

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Selective Adsorption Behavior of Sulfuric Acid Oxidized and Doped Conjugated Microporous Poly(aniline)s toward Lead Ions in an Aqueous Environment

Enhanced Retention of Cd(II) by Exfoliated Bentonite and Its Methoxy Form: Steric and Energetic Studies

Preparation of modified zeolite/chitosan composites and study on the adsorption performance of Pb2+

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Product

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Preparation of modified zeolite/chitosan composites and study on the adsorption performance of Pb²⁺