Efficient removal of Pb(II) ions from aqueous solution by modified red mud

Lyu, Fei; Niu, Sulin; Wang, Li; Liu, Runqing; Sun, Wei; He, Dongdong

doi:10.1016/j.jhazmat.2020.124678

Cited by 85 publications

(18 citation statements)

References 65 publications

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“…It can be seen from the figure that the diffraction peaks of each functional group changed significantly after the loading of MnO 2 and new characteristic peaks appeared. A solid and broad absorption band appeared at 3432.58 and 3405.43 cm −1 for RM and MRM, respectively, which corresponds to the O–H stretching vibration of the hydroxyl group on the surface of the samples 30 , 31 . The band of MRM at 1635.13 cm −1 is attributed to the O–H stretching vibrations in Mn-OH 20 , 32 .…”

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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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%

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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“…With the increase in pH, the degree of protonation on the surface of the adsorbent was significantly reduced, which weakened the electrostatic effect and resulted in a sharp decrease in the adsorption capacity of E . coli [ 35 ]. Consequently, with an increase in pH of the bacterial suspension, the adhesive attraction between SiO 2 @NH 2 @COOH@CST and E .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Colistin-Functionalized Silica Materials for Rapid Capture of Bacteria in Water

Qiu

et al. 2022

Molecules

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In this study, a new colistin-functionalized silica gel material (SiO2@NH2@COOH@CST) was synthesized after carboxylation on the surface of amino-modified silica. The main factors affecting the adsorptive properties of the material, such as the types of linkers, the linking methods, the reaction buffers and the particle sizes of carriers, were systematically investigated. The SiO2@NH2@COOH@CST was characterized by means of electron microscopy, Fourier-transform infrared spectroscopy, zeta potential measurements, etc. We demonstrated that the sorbent showed good adsorption of Gram-negative bacteria. The adsorption efficiency of E. coli on SiO2@NH2@COOH@CST was 5.2 × 1011 CFU/g, which was 3.5 times higher than that on SiO2@NH2@COOH, suggesting that electrostatic interactions between SiO2@NH2@COOH@CST and E. coli played a key role. The adsorption was quick, and was reached in 5 min. Both pseudo-first-order and pseudo-second-order kinetic models fit well with the dynamic adsorption process of SiO2@NH2@COOH@CST, indicating that physical adsorption and chemisorption might occur simultaneously during the adsorption process. SiO2@NH2@COOH@CST was successfully applied for the rapid capture of bacteria from water. The synthesized material could be used as a potential means of bacterial isolation and detection.

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“…Observation in Figure 2a, pH PZC is found at pH of 6.1. The research work of Fei Lyu et al reported that the pH PZC for red mud modi ed by colloidal silica and sodium hydroxide was 7.59 (Lyu et al 2021). In contrast, Tianxue Yang et al reported the pH PZC of red mud and heat-modi ed red mud at 900 ℃ to be 9.8 and 9.5, respectively (Yang et al 2020).…”

Section: Effect Of Phmentioning

confidence: 99%

The effective Ni(II) removal of red mud modified chitosan from aqueous solution

Luu

Nguyen

et al. 2023

Environ Monit Assess

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To remove Ni(II) ions from an aqueous solution, researchers used red mud modi ed by chitosan (RM/CS) material as a new adsorbent. According to the ndings, the surface area of red mud is nearly doubled after being treated with chitosan, from 68.6 m 2 /g to 105.7 m 2 /g. The effects of pH solution, contact time, and material dosage on the Ni(II) uptake were examined. In comparison with the pseudo-rst-order and pseudo-second-order models, the intra-diffusion model was the most suitable kinetic model for the Ni(II) removal. Besides, the three-parameter Sips model was used to predict the Ni(II) adsorption of RM/CS from aqueous solution. Furthermore, the Langmuir maximum Ni(II) uptake capacity of this material was 31.66 mg/g at 323K, which was higher than red mud and several other natural materials. Notably, thermodynamic investigations demonstrated that Ni(II) adsorption on RM/CS is both exothermic and physic.

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Efficient removal of Pb(II) ions from aqueous solution by modified red mud

Cited by 85 publications

References 65 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

Synthesis and Characterization of Colistin-Functionalized Silica Materials for Rapid Capture of Bacteria in Water

The effective Ni(II) removal of red mud modified chitosan from aqueous solution

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