Immobilization, enrichment and recycling of Cr(VI) from wastewater using a red mud/carbon material to produce the valuable chromite (FeCr2O4)

Liu, Changming; Yu, Jian; Li, Wensong; He, Yi; Qiu, Yali; Li, Ping; Wang, Chao; Huang, Fulin; Wang, DeLiang; Gao, Shiqiu

doi:10.1016/j.cej.2018.06.072

Cited by 47 publications

(11 citation statements)

References 44 publications

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“…The Langmuir monolayer capacity of ARM for Cr 6+ is 30.74 mmol/g. The adsorption of competing anions on ARM is in the order of PO [40]. These changes in metal phase enhance the activity of RM in water and heighten the effect of Cr 6+ adsorption [40].…”

Section: Removal Of Chromium (Cr)mentioning

confidence: 97%

“…The adsorption of competing anions on ARM is in the order of PO [40]. These changes in metal phase enhance the activity of RM in water and heighten the effect of Cr 6+ adsorption [40]. The modification of RM-adsorbed Cr 6+ is mainly static gravitational pull.…”

Section: Removal Of Chromium (Cr)mentioning

confidence: 99%

“…Li et al showed that the hydrated garnet (3CaO•Al2O3•SiO2•4H2O) in the original RM decomposes into Ca2Al2SiO7 and Ca3Al2O6 at high temperatures and that CaCO3 is fully decomposed [40]. These changes in metal phase enhance the activity of RM in water and heighten the effect of Cr 6+ adsorption [40]. The modification of RM-adsorbed Cr 6+ is mainly static gravitational pull.…”

Section: Removal Of Chromium (Cr)mentioning

confidence: 99%

“…In conclusion, Cr is recovered and utilized in wastewater, RM solid waste is recycled, and valuable FeCr2O4 is produced. and dissolution rate of Fe over RM/carbon at the constant pH of 3.0 (D) [40,44]. Reproduced with permission from [40], published by Elsevier B.V., 2018.…”

Section: Removal Of Chromium (Cr)mentioning

confidence: 99%

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Application of Red Mud in Wastewater Treatment

Wang

Lyu

et al. 2019

Minerals

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Red mud (RM) is an industrial waste produced in large amounts during alumina extraction from bauxite. Its disposal generates serious environmental pollution due to high alkalinity. Therefore, a strategy for the effective utilization of RM must be developed. For instance, RM may be transformed into useful products, such as adsorbents. Given its high concentrations of aluminum oxides, iron oxides, titanium oxides, silica oxides, and hydroxides, RM may be developed as a cheap adsorbent for the removal of various ions from aqueous solution and soils (e.g., metal and non-metal ions, phenolic compounds, and dyes) and waste gas purification (sulfide and carbide). This review summarizes the background, properties, and applications of RM as an adsorbent. Proper approaches of removing metal and non-metal elements from wastewater are also systematically reviewed and compared. Emphasis is placed on the surface modification of RM to obtain high adsorption. Finally, the scope for future research in this area for RM is discussed in depth.

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Section: Removal Of Chromium (Cr)mentioning

confidence: 97%

Section: Removal Of Chromium (Cr)mentioning

confidence: 99%

Section: Removal Of Chromium (Cr)mentioning

confidence: 99%

Section: Removal Of Chromium (Cr)mentioning

confidence: 99%

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Application of Red Mud in Wastewater Treatment

Wang

Lyu

et al. 2019

Minerals

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“…Recently, RM has been studied in the field of water treatment . Changming Li et al studied the immobilization, enrichment and recovery of chromium in wastewater by a RM/carbon material. Nearly all of the nano zerovalent iron (nZVI; 97.8%) in RM/carbon can be utilized to produce FeCr 2 O 4 with a greater than 45 wt% Cr 2 O 3 content in the final calcined ash.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Xie

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Red mud (RM) is a solid waste generated by the aluminum industry and has demonstrated promising physical adsorption properties for cadmium (Cd) due to its relatively large surface area. To improve the chemisorption performance of RM for Cd(II) ions, a new method utilizing in situ graft polymerization in a reversed-phase suspension system is proposed, and red mud/polyacrylic acid (RM/PAA) composites were synthesized for the first time. RESULTS:The RM/PAA composites were used to adsorb Cd(II) ions from aqueous solutions. Batch equilibrium measurements of RM/PAA were carried out to optimize the parameters. The characteristics were analyzed by scanning electron microscopy, the Brunauer-Emmett-Teller method, X-ray diffraction, Fourier transform infrared and X-ray photon spectroscopy. The maximum adsorption capacity of RM/PAA reached 96.15 mg g −1 , which was much higher than that of the RM (21.70). The Cd(II) adsorption rate increased with increasing solution temperature and followed pseudo-second-order kinetics. The experimental data fitted well with the Langmuir isotherm model, indicating that the adsorption followed the monolayer adsorption model. The thermodynamic parameter values suggested that endothermic and spontaneous adsorption occurred. The surface of RM/PAA possesses abundant oxygen-containing functional groups, and because the specific surface area of the RM/PAA decreased and the amount of adsorption increased compared with those of RM, the surface groups contribute more to Cd(II) retention. Physical adsorption, ion exchange and chelation were possibly the predominant adsorption mechanisms. CONCLUSION: Thus, the RM/PAA composites produced from RM are considered effective and low-cost adsorbents for Cd(II) removal from aqueous solutions. This study is of great significance for waste utilization and environmental protection.

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