Adsorption of lead(II) ions from aqueous solutions onto Cr-pillared clays

Georgescu, Ana-Maria; Nardou, Françoise; Zichil, Valentin; Nistor, Ileana Denisa

doi:10.1016/j.clay.2017.10.031

Cited by 90 publications

(27 citation statements)

References 29 publications

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“…Although there is an increase in pH, this competition decreases as the surface becomes more negatively charged, which increases adsorption of all the elements.The pH of the aqueous solution significantly affects the adsorption of metal ion on the surface of adsorbent. The adsorption capacity metal ions onto adsorbent increases with the increasing pH value of aqueous solution [20].…”

Section: Effect Of Phmentioning

confidence: 98%

Using Acid-Activated Azad Kashmir Clays to Remove Cadmium and Lead Ions from Wastewater

Ayub¹,

Ehsan²,

Chaudhry³

2020

Pol. J. Environ. Stud.

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The adsorption of cadmium and lead ions on purified and acid-activated Azad Kashmir clays were investigated in a batch system. Solutions of lead and cadmium having concentrations typically found in industrial wastewater were used to develop a cheap and reliable adsorbent using local clay for removal of heavy metals from wastewater. The raw clay sample was purified and activated by sulphuric acid before being used for adsorption study. It was characterized by X-ray diffraction and chemical analysis according to the International Standards of Testing (ASTM C 323-56, 2016). The effects of factors like pH, adsorbent quantity, concentration of adsorbate and temperature were studied for both metals. The Langmuir and Freundlich models were used for analysis of adsorption equilibrium. Thermodynamic parameters were calculated. Azad Kashmir clay removed lead and cadmium with maximum adsorption capacity of 3.93 mg metal/g and 7.81 mg metal/g of clay (30ºC; pH 7.3). These values were calculated by applying Langmuir and Freundlich adsorption isotherms to the actual experimental results obtained in this study. The thermodynamic data indicated that the adsorption reaction for cadmium is spontaneous and exothermal while it is endothermic for lead. The Freundlich model provided best fit for sorption isotherms for both cadmium and lead.

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Section: Effect Of Phmentioning

confidence: 98%

Using Acid-Activated Azad Kashmir Clays to Remove Cadmium and Lead Ions from Wastewater

Ayub¹,

Ehsan²,

Chaudhry³

2020

Pol. J. Environ. Stud.

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“…Its sources mainly come from exceeding the standard discharge of industrial wastewater containing heavy metals. The emission of heavy metals will cause serious harm to the biological environment and human health because of their toxicity and difficult biodegradability . Heavy metal materials are chemically stable and cannot be decomposed.…”

Section: Introductionmentioning

confidence: 99%

Microstructural modification of organo‐montmorillonite with Gemini surfactant containing four ammonium cations: molecular dynamics (MD) simulations and adsorption capacity for copper ions

Chu

Khan

Xia

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Copper is a heavy metal that is widely available in nature and has attracted people's attention because of its toxicity and difficult biodegradability. Using modified montmorillonite to adsorb copper ions (Cu 2+ ) was widely adopted because of its simple operation, high efficiency, and easy availability. RESULTS: Na-montmorillonite (Na-Mt) was modified through a Gemini surfactant (containing four ammonium cations) to explore the adsorption capacity for Cu 2+ in aqueous media. The resulting product is called G-Mt. FT-IR XRDBET results indicated that Gemini surfactant has significantly intercalated into the montmorillonite interlayers. The results ofbatch adsorption experiments presented that the amount of adsorbed (qe) depend on pH value and qe (G-Mt) can reach to 29.30 mg/g, which was greater than that of Na-Mt (25.30 mg/g) when pH is 6.0 and initial Cu 2+ concentration is 75 mg/L. The experimental data matched well with Langmuir isotherm. The thermodynamic analysis implied that adsorption of Cu 2+ was endothermic and a spontaneous process. Molecular dynamics (MD) models were carried out to investigate the microstructure and kinetic information of Gemini cations in the interlayer of G-Mt. The results elucidated that the distribution and interaction characteristic of ammonium cations of Gemini surfactant including four ammonium cations were completely different from that of the quaternary ammonium salts containing asingle ammonium cation. CONCLUSION: Generally, considering the comprehensive performances, polyamine Gemini surfactant to modify montmorillonite can improve its ability to adsorb Cu 2+ . The micro environment in the interlayer space and adsorption properties of G-Mt on Cu 2+ , which will improve the potential utilization of G-Mt in soil remediation or wastewater treatment. Y Chu et al.with the original clay. 10,11 Luo et al. 12 used butane-1,4-bis(dodecyl dimethyl ammonium bromide) (gBDDA)-and dodecyl trimethyl ammonium bromide (DTMA)-modified montmorillonite (Mt) to adsorb chromate and phenol. The study revealed that using a Gemini surfactant such as gBDDA to modify Mt would significantly reduce or even have the potential to eradicate the secondary pollution by modifier release during the adsorption process. Li et al. 13 used propyl bis(hexadecyl dimethyl ammonium) chloride (16-3-16)-modified calcium montmorillonite (Ca-Mt) to obtain organo-montmorillonite (G-Mt). The material was used to adsorb a class of emerging contaminants (ECs) such as 1-hydroxybenzotriazole (HOBT), 1H-benzotriazole (BTA) and 5-methyl-1H-benzotriazole (TTA) from wastewater. The maximum adsorption capacities at equilibrium were 25.93, 18.31 and 16.24 mg g −1 for HOBT, BTA and TTA respectively, greater than that of Ca-Mt.Recently, dimeric Gemini surfactant-modified organo-Mts have been of interest to researchers for their applications for adsorbing organic pollutants. 14,15 These dimeric Gemini surfactants generally contain two hydrophilic head groups and two hydrophobic chains linked by a spacer and are expected to ex...

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“…The spectra of the coffee grounds exhibited more peaks, including carboxylic groups from 1,640 cm −1 , C=O carbonyl groups from 1,740 cm −1 , and CH stretching from 2,800 to 2,900 cm −1 . Several bands were observed at 3,000–3,500 cm −1 , representing bonded‐O–H groups (Georgescu, Nardou, Zichil, & Nistor, ). The CES exhibited more peaks than the eggshell, sericite, and coffee grounds, with strong vibrations within a range of 400–900 cm −1 , corresponding to N‐containing bioligands, and 950–1,150 cm −1 , indicating

{PO}_{4}^{3 -}

stretching (Choi & Yu, ).…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption process includes four steps: bulk transport, film diffusion, intraparticle diffusion, and adsorption of the material on the adsorbent (Yu & Choi, ). The adsorption rate is determined by two stages of film diffusion and three stages of intraparticle diffusion (Georgescu et al, ). That is, the adsorption rate varies depending on how quickly the adsorbed material passes through the interface and diffuses into the adsorbent (Nag, Mondal, Roy, Bar, & Das, ).…”

Section: Resultsmentioning

confidence: 99%

Assessment of the adsorption kinetics, equilibrium, and thermodynamic for Pb(II) removal using a low‐cost hybrid biowaste adsorbent, eggshell/coffee ground/sericite

Choi

2019

Water Environment Research

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A hybrid adsorbent (CES), coffee grounds, eggshell powder and sericite as a binder, was prepared to remove Pb(II) from aqueous solution. The Fourier‐transform infrared spectroscopy analysis showed that the CES contained a large amount of OH groups and had a favorable structure for adsorbing heavy metals. The value of pHpzc of CES was estimated at 7.08. In the neutral pH region, the surface of CES is negatively charged and favorable for adsorption of Pb(II). The maximum Langmuir adsorption amount was 155.67 mg/g, and the adsorption process of Pb(II) using CES fitted pseudo‐second‐order kinetic model and Langmuir isotherm model. Moreover, the analysis of adsorption energy, free energy, enthalpy, and entropy found that the adsorption of Pb(II) onto CES was physical and a spontaneous exothermic reaction. CES is a hybrid adsorbent using general municipal waste and has great advantages in terms of environmental conservation and sustainable environmental circulation. This allows it to compete with other adsorbents. Practitioner points A hybrid adsorbent, coffee grounds, eggshell, and sericite (CES), was used to remove Pb(II) Adsorption of Pb(II) using CES in an aqueous solution was physical rather than chemical CES contained a large amount of OH groups and had a favorable structure for adsorbing heavy metals The reactivity and strength of the adsorption of Pb(II) onto CES was very good CES has great advantages in terms of environmental conservation and sustainable environmental circulation.

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Adsorption of lead(II) ions from aqueous solutions onto Cr-pillared clays

Cited by 90 publications

References 29 publications

Using Acid-Activated Azad Kashmir Clays to Remove Cadmium and Lead Ions from Wastewater

Using Acid-Activated Azad Kashmir Clays to Remove Cadmium and Lead Ions from Wastewater

Microstructural modification of organo‐montmorillonite with Gemini surfactant containing four ammonium cations: molecular dynamics (MD) simulations and adsorption capacity for copper ions

Assessment of the adsorption kinetics, equilibrium, and thermodynamic for Pb(II) removal using a low‐cost hybrid biowaste adsorbent, eggshell/coffee ground/sericite

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