Efficient preparation of red mud-based geopolymer microspheres (RM@GMs) and adsorption of fluoride ions in wastewater

Wang, Kaituo; Wei, Hongyang; Wei, Xuefei; Wei, Binghu; Shao, Lin; Fujita, Toyohisa; Cui, Xuemin

doi:10.1016/j.jhazmat.2022.130027

Cited by 59 publications

(6 citation statements)

References 63 publications

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“…Knowledge of the dependence of the amount of assimilable and nonassimilable P 2 O 5 on the cooling rate makes it possible to determine the optimum conditions for feed phosphate production. Experimental results and infrared spectroscopy data show that abrasion of phosphorite suspension results in defluorination, increase of its reactivity and conversion of tricalcium phosphate from βmodification to assimilable A-modification 18) . These changes are not so much related to the increase in specific surface area as to the increase in defectivity of fluorocarbonapatite crystals.…”

Section: Resultsmentioning

confidence: 97%

Investigation of Production Wastes Upon Roasting Mechanically Activated Phosphorite and Utilisation of Fluorine Compounds

Nurtayeva,

Baisbay,

Issayeva

et al. 2024

Evergreen

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The purpose was to investigate the process of formation and characteristics of fluorine compounds in the production waste upon roasting mechanically activated phosphorite, as well as the development of effective methods and technologies for their utilisation. The present study employed the analytical method, the classification method, the functional method, the statistical method, the synthesis method, structure-functional method, method of deduction. During the study, the composition of waste products from the roasting of mechanically activated phosphorite was analysed. Proper treatment of fluoride compounds is critical to preserving the environment and ensuring general well-being. These substances are toxic and can harm ecosystems and human health. Fluoride compounds generated during firing can have a negative impact on biological systems, and therefore, the effective disposal of these substances is becoming an integral part of the industrial production of phosphate rock and mineral fertilizers. The waste was found to contain significant amounts of fluoride compounds, including gaseous and solid forms. This confirms the need to develop methods and technologies for their utilisation.

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Section: Resultsmentioning

confidence: 97%

Investigation of Production Wastes Upon Roasting Mechanically Activated Phosphorite and Utilisation of Fluorine Compounds

Nurtayeva,

Baisbay,

Issayeva

et al. 2024

Evergreen

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“…As a result, the removal rate of fluoride ions only reached 7.5%. This phenomenon occurred because the PO 4 3− ion carried a higher charge, facilitating its binding with H + ions in the solution, thereby influencing the solution's pH and consequently impacting the active sites of the ternary compound oxides [45,46]. In addition, the presence of PO 4 3− affected the HF species of fluoride, limiting the effective contact between the fluoride ions and the adsorption active site.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Xie,

Xiao,

Huang

et al. 2024

Nanomaterials

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In recent years, fluoride pollution in water is a problem that has attracted much attention from researchers. The removal of fluoride-containing wastewater by adsorption with metal oxide as an adsorbent is the most common treatment method. Based on this, the effect of the doping ratio of La2O3, Fe2O3, and Al2O3 on the fluoride-removal performance was discussed by constructing a phase diagram. In this study, the adsorption mechanism of nanocrystalline lanthanum oxide terpolymer was investigated by density functional theory calculation and experiment. The optimal pH condition selected in the experiment was three, and the adsorption kinetics of fluoride ions were more consistent with the quasi-second-order kinetic model. The adsorption thermodynamics was more consistent with the Langmuir model. When the La-Fe-Al ternary composite oxides achieved the optimal adsorption efficiency for fluoride ions, the mass synthesis ratio was Al2O3:(Fe2O3:La2O3 = 1:2) = 1:100, resulting in a fluoride ion removal rate of up to 99.78%. Density functional calculations revealed that the La-Fe-Al ternary composite oxides had three important adsorption sites for La, Fe, and Al. Among them, the adsorption capacity for HF was Fe2O3 > La2O3 > Al2O3, and for F− was La2O3 > Al2O3 > Fe2O3. This provided good guidance for designing adsorbents to remove fluoride.

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“…More and more scholars are becoming interested in geopolymers due to their wide range of cheap raw materials, simple and normal-temperature synthesis process and great adaptive and adsorption capacities [27][28][29][30][31]. The raw materials for geopolymerization reactions typically consist of aluminosilicates and silicoaluminates [32].…”

Section: Introductionmentioning

confidence: 99%

Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems

Fang,

Yang,

Rao

et al. 2024

Molecules

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Geopolymers show great potential in complex wastewater treatment to improve water quality. In this work, general geopolymers, porous geopolymers and geopolymer microspheres were prepared by the suspension curing method using three solid waste products, coal gangue, fly ash and blast furnace slag. The microstructure, morphology and surface functional groups of the geopolymers were studied by SEM, XRD, XRF, MIP, FTIR and XPS. It was found that the geopolymers possess good adsorption capacities for both organic and inorganic pollutants. With methylene blue and potassium dichromate as the representative pollutants, in order to obtain the best removal rate, the effects of the adsorbent type, dosage of adsorbent, concentration of methylene blue and potassium dichromate and pH on the adsorption process were studied in detail. The results showed that the adsorption efficiency of the geopolymers for methylene blue and potassium dichromate was in the order of general geopolymers < porous geopolymers < geopolymer microspheres, and the removal rates were up to 94.56% and 79.46%, respectively. Additionally, the competitive adsorption of methylene blue and potassium dichromate in a binary system was also studied. The mechanism study showed that the adsorption of methylene blue was mainly through pore diffusion, hydrogen bond formation and electrostatic adsorption, and the adsorption of potassium dichromate was mainly through pore diffusion and redox reaction. These findings demonstrate the potential of geopolymer microspheres in adsorbing organic and inorganic pollutants, and, through five cycles of experiments, it is demonstrated that MGP exhibits excellent recyclability.

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Efficient preparation of red mud-based geopolymer microspheres (RM@GMs) and adsorption of fluoride ions in wastewater

Cited by 59 publications

References 63 publications

Investigation of Production Wastes Upon Roasting Mechanically Activated Phosphorite and Utilisation of Fluorine Compounds

Investigation of Production Wastes Upon Roasting Mechanically Activated Phosphorite and Utilisation of Fluorine Compounds

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Behaviors and Mechanisms of Adsorption of MB and Cr(VI) by Geopolymer Microspheres under Single and Binary Systems

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