Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution

Xia, Baolin; Shi, Ruohan; Wang, Wei; Peng, Weijun; Cao, Yijun; Huang, Yukun; Fan, Guixia

doi:10.1016/j.conbuildmat.2024.134888

Cited by 3 publications

(2 citation statements)

References 46 publications

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“…As can be seen from the FTIR patterns in Figure 8b, the peak at 3446 cm −1 indicates the presence of hydroxyl groups on the surface of the MGPs [43][44][45]. The stretching vibration at 1609 cm −1 is caused by the aromatic ring of methylene blue, and the bending vibration of methyl at 1339 cm −1 is also evidence of MB adsorption on the MGPs.…”

Section: Adsorption Mechanism Analysismentioning

confidence: 90%

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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Section: Adsorption Mechanism Analysismentioning

confidence: 90%

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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“…The recrystallization method can fully release the impurities incorporated into the gypsum lattice through PG's dissolution-recrystallization process, transforming into α-CaSO 4 •0.5H 2 O or CaSO 4 in a solution system [85,86]. Meanwhile, a specific type of regulator is added to control the form of released impurities to inhibit them from entering the recrystallized product again, ultimately achieving efficient separation of impurities.…”

Section: Recrystallization Methodsmentioning

confidence: 99%

The Impurity Removal and Comprehensive Utilization of Phosphogypsum: A Review

Guan,

Wang,

Zhou

et al. 2024

Materials

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Phosphogypsum (PG), a byproduct during the phosphoric acid production process, also known as the wet process, contains complex and diverse impurities, resulting in low utilization and considerable accumulation. This leads to a massive waste of land resources and a series of environmental pollution problems. Given the current urgent ecological and environmental situation, developing impurity removal processes with low energy consumption and high efficiency, exploring valuable resource recovery, preparing high value-added PG products, and broadening the comprehensive utilization ways of PG are significant strategies to promote the sustainable consumption of PG and sustainable development of the phosphorus chemical industry. This review comprehensively summarizes the advantages and disadvantages of existing PG impurity removal and utilization technologies and probes into the future development direction, which provides references and ideas for subsequent PG research.

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Removal of fluoride ions from wastewater via simple low-temperature thermal decomposition-modified phosphogypsum

Wu,

Chen,

Liu

et al. 2024

Journal of Saudi Chemical Society

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Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure nitrate solution

Cited by 3 publications

References 46 publications

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

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

The Impurity Removal and Comprehensive Utilization of Phosphogypsum: A Review

Removal of fluoride ions from wastewater via simple low-temperature thermal decomposition-modified phosphogypsum

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