Novel red mud/polyacrylic composites synthesized from red mud and its performance on cadmium removal from aqueous solution

Liu, Jing; Xie, Yan; Li, Chen; Fang, Guantao; Chen, Qianlin; Ao, Xianquan

doi:10.1002/jctb.6223

Cited by 14 publications

(9 citation statements)

References 44 publications

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“…The band of MRM at 1635.13 cm −1 is attributed to the O–H stretching vibrations in Mn-OH 20 , 32 . The band at 1418.62 cm −1 appearing in RM is attributed to CO 3 2+ ,proving that RM contains many carbonate compounds 33 , 34 . However, the CO 3 2+ peak in the MRM shifts and decreases in intensity after loading MnO 2 .…”

Section: Resultsmentioning

confidence: 93%

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: 93%

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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“…Subsequently, the experimental data were assessed with Langmuir and Freundlich isotherm models. The Langmuir isotherm (Eqn (6)) holds that monomolecular‐layer adsorption occurs on homogeneous binding sites and the Freundlich isotherm (Eqn (7)) holds that the surface adsorption sites are heterogeneous 44,45 :

\frac{C_{normale}}{q_{e}} = \frac{C_{normale}}{q_{normalm}} + \frac{1}{k_{L} q_{m}}

\ln q_{e} = \ln K_{F} + \frac{1}{n} \ln C_{e}

…”

Section: Resultsmentioning

confidence: 99%

Fabrication of recoverable magnetic composite material based on graphene oxide for fast removal of lead and cadmium ions from aqueous solution

Hou

Qin

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND In this study, a novel magnetic material was applied as an adsorbent for simultaneous removal of Pb(II) and Cd(II) ions from aqueous solutions. The adsorbent was synthesized using functionalized MnFe2O4 magnetic nanoparticles grafted to lamellar graphene oxide surface (MnFe2O4@SiO2‐NH2@GO) and characterized using X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and magnetic measurements. RESULTS The adsorbent exhibited superior adsorption properties for Pb(II) and Cd(II). The maximum uptake capacity of Pb(II) and Cd(II) reached 42.48 and 18.28 mg g−1 within 30 min at 25 °C, respectively. The data for adsorption fitted well with the Langmuir isotherm and pseudo‐second‐order kinetic models, which indicated that the adsorption was via monolayer chemisorption on homogeneous sites. The calculation of thermodynamic parameters revealed spontaneous and endothermic adsorption processes accompanied by randomness increase. X‐ray photoelectron spectroscopy analysis indicated that the coordination between nitrogen atoms of amino groups and the two types of heavy metal ions was a possible adsorption mechanism. CONCLUSIONS MnFe2O4@SiO2‐NH2@GO possesses the properties of high adsorption efficiency, fast separation, high stability and easy regeneration for adsorption of Pb(II) and Cd(II) ions. Thus, the as‐prepared adsorbent is considered as a promising material for the removal of heavy metal ions and this research could offer a new means for water cleanup. © 2020 Society of Chemical Industry

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“…Red mud is composed of a large number of active components (such as Fe 2 O 3 , Al 2 O 3 , and CaO) that show certain adsorption properties for anions (such as phosphorus). The adsorption performance of the anions must be improved by modification, which includes acid treatment, heat treatment, and chemical reagent modification 16,17 . Hu et al .…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption performance of the anions must be improved by modification, which includes acid treatment, heat treatment, and chemical reagent modification. 16,17 Hu et al employed hydrochloric acid to activate red mud particles, which then showed an excellent adsorption capacity for recovering phosphorus in water. 18 Lin et al studied the effects of heat treatment on the adsorption capacity of red mud, and the results showed that the calcium and aluminum of the treated sample adsorbed phosphate and generated secondary adsorption sites.…”

Section: Introductionmentioning

confidence: 99%

Adsorption performance of red mud magnetic composite material modified by Spirit‐based distillers' grains for low‐concentration phosphorus in water

Xie

Meng

et al. 2022

J of Chemical Tech & Biotech

Self Cite

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Background: Research on phosphate removal has focused on high-phosphorus wastewater, which has difficulty meeting the discharge standard through one-step processing. Herein, the rich carbon source of spirit-based distillers' grains was used to reduce and roast red mud (RM) to prepare magnetic adsorption material (MRM), aiming to improve the adsorption performance of RM on low-concentration phosphorus in water and to facilitate the separation and recovery of the adsorbent.Results: The characterization results of MRM indicated that the high-temperature decomposition of macromolecular minerals in RM exposed more active sites of metal ions. Compared with unmodified samples, the specific surface area and saturation magnetization of MRM increased by 3.64 and 9.21 times, respectively;this provided more active sites for phosphorus adsorption by MRM and gave the material magnetic separation ability. The results of adsorption experiments showed that MRM had a wide applicable pH range and good selectivity for phosphorus adsorption, and the phosphorus removal rate was 4.97 times that of RM. The adsorption process of phosphorus by MRM was more in line with the Langmuir isotherm adsorption model and the quasi-second-order kinetic equation, as it was a process of spontaneous endothermic entropy increase. The phosphorus removal mechanism included chemical precipitation, coordination exchange, physical adsorption, and electrostatic attraction.Conclusion: MRM has good adsorption performance for low concentrations of phosphorus in water and provides an effective method for the resource utilization of red mud and spirit-based distillers' grains.

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Novel red mud/polyacrylic composites synthesized from red mud and its performance on cadmium removal from aqueous solution

Cited by 14 publications

References 44 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

Fabrication of recoverable magnetic composite material based on graphene oxide for fast removal of lead and cadmium ions from aqueous solution

Adsorption performance of red mud magnetic composite material modified by Spirit‐based distillers' grains for low‐concentration phosphorus in water

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