Equilibrium studies on removal of lead (II) ions from aqueous solution by adsorption using modified red mud

Narayanan, Saravanan; Venkatesan, G.; Potheher, I. Vetha

doi:10.1007/s13762-017-1513-x

Cited by 36 publications

(6 citation statements)

References 43 publications

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“…However, the CO 3 2+ peak in the MRM shifts and decreases in intensity after loading MnO 2 . The peaks appearing at 996.62 and 992.96 cm −1 are caused by O–Si–O stretching vibrations 35 , 36 . The presence of Al–O stretching vibrations (684.62 cm −1 ), Si–O–Al stretching vibrations (620.98 cm −1 ) and Fe–O stretching vibration (458.98 cm −1 ) existing in RM disappeared in the MRM 37 , while a clear absorption peak at 532.56 cm −1 appeared in the MRM.…”

Section: Resultsmentioning

confidence: 99%

“…The Freundlich model: where q e (mg g −1 ) is the equilibrium Cd 2+ adsorption capacity, c e is the equilibrium Cd 2+ concentration of the solution, n is the Freundlich exponent, and K F (mg 1−1/n L 1/n g −1 ) is Freundlich adsorption constant. 1/n value indicates the strength of the effect of concentration on adsorption, with 1 < n < 10 indicating favourable adsorption 35 , 48 .…”

Section: Resultsmentioning

confidence: 99%

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Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Pang

Zhao

et al. 2022

Sci Rep

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In this study, red mud modified by manganese dioxide(MRM) was utilized as an adsorbent to effectively remove Cd2+ from aqueous solution. The characteristics were analysed by SEM–EDS, XRD, BET, FTIR and XPS. Different factors that affected the Cd2+ removal on MRM, such as dosage, initial pH, initial Cd2+ concentration, were investigated using batch adsorption experiments. Simultaneously, the adsorption kinetics, adsorption isotherms and adsorption thermodynamics of Cd2+ were also investigated using adsorption experiments data. The characterization results showed that MRM had a rougher, larger specific surface area and pore volume (38.91 m2 g−1, 0.02 cm3 g−1) than RM (10.22 m2 g−1, 0.73 cm3 g−1). The adsorption experiments found that the equilibrium adsorption capacity of MRM for Cd2+ was significantly increased to 46.36 mg g−1, which was almost three times that of RM. According to the fitting results, the pseudo-second-order kinetic model described the adsorption process better than the pseudo-first-order kinetic model. The Langmuir model fitted the adsorption isotherms well, indicating that the adsorption process was unimolecular layer adsorption and the maximum capacity was 103.59 mg g−1. The thermodynamic parameters indicated that the adsorption process was heat-trapping and spontaneous. Finally, combined XPS and FTIR studies, it was speculated that the adsorption mechanisms should be electrostatic attachment, specific adsorption (i.e., Cd–O or hydroxyl binding) and ion exchange. Therefore, manganese dioxide modified red mud can be an effective and economical alternative to the removal of Cd2+ in the wastewater treatment process.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Pang

Zhao

et al. 2022

Sci Rep

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“…The adsorption followed the Freundlich isotherm model and quasi-secondorder kinetic model and demonstrated physical, spontaneous, and exothermic nature of adsorption. 172 Similarly, red mud, 173 natural clay and clay/Fe-Mn composite, 174 and iron oxidecoated acid-treated activated red mud 175 have been proven to be effective for the removal of heavy metals ions. Natural and modied zeolites also contribute to the remediation of heavy metals.…”

Section: Inorganic-based Adsorbentsmentioning

confidence: 99%

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Sheraz,

Shah,

Haleem

et al. 2024

RSC Adv.

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“…[ 1 , 2 ]. Most of these solid wastes contain large amounts of alkaline substances and heavy metals due to their production conditions, and can easily cause secondary pollution and threats to human health when handled and used [ 3 , 4 ]. To address the issue of the increasing amount of solid wastes and the need for environmentally-friendly uses, new strategies need to be urgently devised for the utilization of solid wastes.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

Shang

Fan

et al. 2022

Materials

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SiC was chosen as the foaming agent, and river bottom silt, waste oil sludge, paint bucket slag, and fly ash were used as raw materials, to prepare lightweight ceramsite without adding any chemical additives. The effects of SiC dosing and sintering temperature on various properties of the ceramsite were studied, and the pore-forming mechanism of the lightweight ceramsite was clarified by thermal analysis and X-ray diffraction analysis. The results showed that the single ceramsite compressive strength, water absorption, bulk density, and porosity of ceramsite sintered at 1180 °C with 1.0% SiC were 2.15 MPa, 2.02%, 490 kg/m3, and 23.85%, respectively. The major mineralogical compositions were quartz, fayalite, and kyanite, with small amounts of albite-low from 1140 to 1190 °C. Furthermore, the concentration of all tested heavy metals from ceramsite was lower than the maximum allowable concentration of the leaching solution specified in the Chinese national standard (GB 5085.3-2007), which reveals that this solid waste ceramsite will not cause secondary environmental pollution. The prepared ceramsite, exhibiting lower bulk density, high water absorption and porosity, and effective solidification of deleterious elements, can be used to prepare green lightweight aggregate concrete. Importantly, preparation of solid waste ceramsite is an effective way to dispose of hazardous wastes.

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Equilibrium studies on removal of lead (II) ions from aqueous solution by adsorption using modified red mud

Cited by 36 publications

References 43 publications

Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Cadmium adsorption performance and mechanism from aqueous solution using red mud modified with amorphous MnO2

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Preparation of Lightweight Ceramsite from Solid Waste Using SiC as a Foaming Agent

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