Adsorption of heavy metals on conventional and nanostructured materials for wastewater treatment purposes: A review

Burakov, Alexander E.; Galunin, Evgeny; Burakova, I. V.; Kucherova, A. E.; Agarwal, Shilpi; Ткачев, А. Г.; Gupta, Vinod Kumar

doi:10.1016/j.ecoenv.2017.11.034

Cited by 1,238 publications

(420 citation statements)

References 201 publications

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“…In a third set of experiments, the effect of metal ion concentration on the adsorption behavior of allophanes was investigated at pH 8.5 ± 0.1 for 2 h using 0.1 g of the adsorbent and 50 mL of solution containing Ba, Co, Sr and Zn in different concentrations (1,10,20,50 and 100 mg/L). The suspensions were prepared in analogy to those from the second set of experiments.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Recently, agricultural and industrial waste products, activated carbon nanotubes, cellulose, carbonates, Feand Al-oxyhydroxides, zeolites, phosphates and clay minerals are used in the remediation of water that is severely polluted with persistent and hazardous components such as heavy metal ions, dyes, antibiotics, biocide compounds and other organic chemicals [12][13][14][15][16]. The use of clay minerals for wastewater treatment can be advantageous over other sorbents due to their worldwide occurrence, low mining and processing costs and outstanding physicochemical and surface properties, making clayey materials suitable for selective ion exchange, adsorption and catalyst uses [1,17,18].…”

Section: Introductionmentioning

confidence: 99%

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Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

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Abstract:The capacity and the mechanism of the adsorption of aqueous barium (Ba), cobalt (Co), strontium (Sr) and zinc (Zn) by Ecuadorian (NatAllo) and synthetic (SynAllo-1 and SynAllo-2) allophanes were studied as a function of contact time, pH and metal ion concentration using kinetic and equilibrium experiments. The mineralogy, nano-structure and chemical composition of the allophanes were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy and specific surface area analyses. The evolution of adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium between aqueous metal ions and allophane was reached within < 10 min. The metal ion removal efficiencies varied from 0.7 to 99.7 % at pH 4.0 to 8.5. At equilibrium, the adsorption behavior is better described by the Langmuir model than by the Dubinin-Radushkevich model, yielding sorption capacities of 10.6, 17.2 and 38.6 mg/g for Ba , 12.4, 19.3 and 29.0 mg/g for HCoO , 7.2, 15.9 and 34.4 mg/g for Sr and 20.9, 26.9 and 36.9 mg/g for Zn , respectively, by NatAllo, SynAllo-2 and SynAllo-1. The uptake mechanism is based on a physical adsorption process. Allophane holds great potential to remove aqueous metal ions and could be used instead of zeolites, montmorillonite, carbonates and phosphates for wastewater treatment.

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Section: Adsorption Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Baldermann¹,

Grießbacher²,

Baldermann³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Heavy metals are typically released by the weathering of rocks and minerals and from a wide range of human activities such as agriculture, energy production, manufacturing, transportation, mining, and waste disposal [1]. They often cause deleterious effects on aquatic life and to the terrestrial environment [2,3].…”

Section: Introductionmentioning

confidence: 99%

Removal of Barium, Cobalt, Strontium, and Zinc from Solution by Natural and Synthetic Allophane Adsorbents

et al. 2018

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Abstract:The capacity and mechanism of the adsorption of aqueous barium (Ba), cobalt (Co), strontium (Sr), and zinc (Zn) by Ecuadorian (NatAllo) and synthetic (SynAllo-1 and SynAllo-2) allophanes were studied as a function of contact time, pH, and metal ion concentration using kinetic and equilibrium experiments. The mineralogy, nano-structure, and chemical composition of the allophanes were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and specific surface area analyses. The evolution of adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium between aqueous metal ions and allophane was reached within <10 min. The metal ion removal efficiencies varied from 0.7 to 99.7% at pH 4.0 to 8.5. At equilibrium, the adsorption behavior is better described by the Langmuir model than by the Dubinin-Radushkevich model, yielding sorption capacities of 10.6, 17.2, and 38.6 mg/g for Ba 2+ , 12.4, 19.3, and 29.0 mg/g for HCoO − 2 ; 7.2, 15.9, and 34.4 mg/g for Sr 2+ ; and 20.9, 26.9, and 36.9 mg/g for Zn 2+ , by NatAllo, SynAllo-2, and SynAllo-1, respectively. The uptake mechanism is based on a physical adsorption process rather than chemical ion exchange. Allophane holds great potential to effectively remove aqueous metal ions over a wide pH range and could be used instead of other commercially available sorbent materials such as zeolites, montmorillonite, carbonates, and phosphates for special wastewater treatment applications.

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“…Clay as an adsorbent is widely used for the removal of heavy metals and has great applicability due to its being economical and having an environment-friendly nature, a high adsorption capacity, and a wide pH range [12,13]. In recent years, many kinds of clay, i.e., bentonite, kaolin, and montmorillonite, have been reported for the removal of high-concentration heavy metals from water [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effective Removal of Lead Ions from Aqueous Solution Using Nano Illite/Smectite Clay: Isotherm, Kinetic, and Thermodynamic Modeling of Adsorption

Yin

Deng

et al. 2018

Water

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Illite-smectite clay is a new mixed mineral of illite and montmorillonite. The ability of nano illite/smectite clay to remove Pb(II) from slightly polluted aqueous solutions has been investigated. The effects of pH, contact time, initial concentration of Pb(II), nano illite/smectite clay dosage, and temperature on the adsorption process were studied. The nano illite/smectite clay was characterized by X-Ray Diffraction (XRD), Fourier transform infrared spectrometry (FTIR), and Scanning electron microscopy (SEM). The results showed that Pb(II) was adsorbed efficiently by nano illite/smectite clay in aqueous solution. The pseudo-second-order kinetic model best described the kinetic of the adsorption, and the adsorption capacity of nano illite/smectite (I-S m ) clay was found to be 256.41 µg·g −1 for Pb(II). The adsorption patterns followed the Langmuir isotherm model. Thermodynamic parameters, including the Gibbs free energy (∆G), enthalpy (∆H), and entropy (∆S) changes, indicated that the present adsorption process was feasible, spontaneous, and endothermic in the temperature range of 298-333 K.

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Adsorption of heavy metals on conventional and nanostructured materials for wastewater treatment purposes: A review

Cited by 1,238 publications

References 201 publications

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Removal of barium, cobalt, strontium and zinc from solution by natural and synthetic allophane adsorbents

Removal of Barium, Cobalt, Strontium, and Zinc from Solution by Natural and Synthetic Allophane Adsorbents

Effective Removal of Lead Ions from Aqueous Solution Using Nano Illite/Smectite Clay: Isotherm, Kinetic, and Thermodynamic Modeling of Adsorption

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