Controlled preparation of cerium oxide loaded slag-based geopolymer microspheres (CeO2@SGMs) for the adsorptive removal and solidification of F− from acidic waste-water

Wang, Kaituo; Lei, Huiye; Muhammad, Yaseen; Chen, Fan; Gao, Feng; Wei, Yuezhou; Fujita, Toyohisa

doi:10.1016/j.jhazmat.2020.123199

Cited by 51 publications

(8 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…45 In addition, the entropy change (∆S) of the process was 0.191 kJ/mol K (MB) and 0.122 kJ/mol K (Cu 2+ ), indicating that the molecular rearrangement occurred at the solid-liquid interface during the adsorption process and the degree of the disorder increased. 46 Since there were different ions in the actual sewage, here, different dyes and ions in the sewage were also simulated, as shown in Figure 11. With the addition of 2 g/L G20 samples, the adsorption capacities of other dyes, such as crystal violet (CV), malachite green (MG), and congo red (CR) were 38.82, 48.28, and 35.88 mg/g, respectively.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

Yan

Feng

Huang

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

In order to realize the value-added resource utilization of solid waste, geopolymer particle adsorbents were prepared at low temperatures using silica-aluminumrich fly ash and steel slag powders as raw materials. In order to investigate the mechanism of their adsorption of dyes and heavy metal ions from wastewater, the effects of steel slag/fly ash ratio, adsorbent dosage, initial concentration of methylene blue (MB) and Cu 2+ solution, adsorption time and temperature on the adsorption performance of the fly ash/steel slag-based geopolymer adsorbents were investigated, systematically. Results presented that the adsorption capacities of MB and Cu 2+ were 33.30 and 24.15 mg/g, and the removal efficiencies were 99.90% and 96.59% with the dosages of 3 and 4 g/L geopolymer adsorbents (steel slag/fly ash ratio of 20 wt.%), respectively. The adsorption processes of MB and Cu 2+ on the adsorbents were in accordance with the proposed pseudo-second-order and Langmuir isotherm models, which mainly included physical and chemical adsorption mechanisms. The adsorption was a spontaneous endothermic process. The fly ash/steel slag-based geopolymer had good removal ability for dyes and heavy metal ions, and it could maintain good adsorption performance after three cycles of regeneration. It had potential application in wastewater treatment.

show abstract

Section: Adsorption Mechanismmentioning

confidence: 99%

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

Yan

Feng

Huang

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…There are always geopolymer-based adsorbents developed for the removal of anions, such as I − [ 181 ], F – [ 182 , 183 ], Se oxyanions [ 128 , 184 ], As oxyanion [ 185 ], P oxyanion [ 186 ], S oxyanion [ 187 ], Sb oxyanion [ 188 ], etc. In most cases, geopolymers are adopted as the matrix, and sorption active sites are loaded through ion exchange, precipitation, etc., Compared to cationic metals, there are few studies reported about the S/S of anionic species using geopolymers, except for the above-mentioned elements in detail.…”

Section: Geopolymer-based S/s Processmentioning

confidence: 99%

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

et al. 2022

View full text Add to dashboard Cite

Geopolymers, as a kind of inorganic polymer, possess excellent properties and have been broadly studied for the stabilization/solidification (S/S) of hazardous pollutants. Even though many reviews about geopolymers have been published, the summary of geopolymer-based S/S for various contaminants has not been well conducted. Therefore, the S/S of hazardous pollutants using geopolymers are comprehensively summarized in this review. Geopolymer-based S/S of typical cations, including Pb, Zn, Cd, Cs, Cu, Sr, Ni, etc., were involved and elucidated. The S/S mechanisms for cationic heavy metals were concluded, mainly including physical encapsulation, sorption, precipitation, and bonding with a silicate structure. In addition, compared to cationic ions, geopolymers have a poor immobilization ability on anions due to the repulsive effect between them, presenting a high leaching percentage. However, some anions, such as Se or As oxyanions, have been proved to exist in geopolymers through electrostatic interaction, which provides a direction to enhance the geopolymer-based S/S for anions. Besides, few reports about geopolymer-based S/S of organic pollutants have been published. Furthermore, the adsorbents of geopolymer-based composites designed and studied for the removal of hazardous pollutants from aqueous conditions are also briefly discussed. On the whole, this review will offer insights into geopolymer-based S/S technology. Furthermore, the challenges to geopolymer-based S/S technology outlined in this work are expected to be of direct relevance to the focus of future research.

show abstract

“…For this end, composite or functionalized materials are designed. Removal of F ̶ was demonstrated by slag-based GP microspheres modified with CeO [138], Fe 2 O 3 [136], and bivalent metallic species [41] with capacities towards the contaminant 127.7 mg/g, 59.8 mg/g, and 60 mg/g (zinc impregnated BOFS-GP), respectively. A metakaolin-based GP functionalized by surfactant was developed for efficient removal of radioactive iodide [97].…”

Section: Properties and Performance Of Gps/aams Towards Various Contamentioning

confidence: 99%

Geopolymers and Alkali-Activated Materials for Wastewater Treatment Applications and Valorization of Industrial Side Streams

Samarina¹,

Takaluoma²,

Laatikainen³

2021

Advances in Geopolymer-Zeolite Composites - Synthesis and Characterization

View full text Add to dashboard Cite

The EU has the ambitious goal to transition from linear to circular economy. In circular economy, the old saying of “one’s waste is the other’s treasure” is being implemented. In this chapter, valorisation of industrial side streams, traditionally branded as waste, is discussed with respect to their applications as raw materials for new adsorptive products – geopolymers (GP) and alkali-activated materials (AAM) – as adsorbents in wastewater treatment. The chemical nature and structure of materials generally have great influence on GP/AAM adsorption capability. The approaches used for the raw materials preparation (chemical or physical) prior geopolymerization to increase the adsorption capacity of the final products will be discussed. Adsorption properties and performance of GPs/AAMs towards various contaminants are described, and the latest research on testing those materials as water remediation are reviewed. Special attention is paid to regeneration of exhausted materials and available resource recovery options that the regeneration approach opens. New forms of geopolymer adsorbent such as foams or core-shell structures are described and in the last part of the chapter, a short economic evaluation of resource recovery models is provided.

show abstract

Controlled preparation of cerium oxide loaded slag-based geopolymer microspheres (CeO2@SGMs) for the adsorptive removal and solidification of F− from acidic waste-water

Cited by 51 publications

References 59 publications

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

Geopolymers and Alkali-Activated Materials for Wastewater Treatment Applications and Valorization of Industrial Side Streams

Contact Info

Product

Resources

About