Co-pyrolysis of polyester and cotton via thermogravimetric analysis and adsorption mechanism of Cr(VI) removal by carbon in aqueous solution

Zhong, Mengqi; Li, Jinping; Wang, Teng; Liu, Jingxin; Mei, Meng; Chen, Si

doi:10.1016/j.molliq.2022.118902

Cited by 20 publications

(16 citation statements)

References 55 publications

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“…The fluctuation of O α content suggests that BISC offers substantial reactive oxygen species (ROSs) due to biochar induction, which accounts for the chromium adsorption on BISC. Besides, it is observed that the O1s peak of BISC···Cr shifts to higher binding energy compared to BISC and Co–SiO 2 , indicating the strong combination of O and Cr in BISC···Cr, , in agreement with the chemisorption characteristic of Cr obtained from the adsorption kinetics. Therefore, it is inferred that chromium can be trapped by the surface oxygen of BISC, further confirming the potential formation of Cr–O–Co in BISC···Cr.…”

Section: Resultssupporting

confidence: 80%

In Situ Reconstruction of Active Catalysis Sites Triggered by Chromium Immobilization for Sulfite Oxidation

Zhang

et al. 2023

Environ. Sci. Technol.

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Hexavalent chromium (Cr(VI)) is a highly toxic substance in wastewater, triggering grievous detriment to aquatic life and human health. Magnesium sulfite is spawned along with the desulfurization process in coal-fired power plants, which is usually disposed of as solid waste. Here, a “waste control by waste” method was proposed upon the redox of Cr(VI)–sulfite, in which highly toxic Cr(VI) is detoxicated and sequent enriched on a novel biochar-induced cobalt-based silica composite (BISC) due to the forced electron transfer from chromium to surface hydroxyl. The immobilized Cr on BISC gave rise to the reconstruction of catalytic active sites “Cr–O–Co”, which further enhance its performance in sulfite oxidation by elevating O2 adsorption. As a result, the sulfite oxidation rate increased by 10 times compared with the non-catalysis benchmark together with the maximum chromium adsorption capacity being 120.3 mg/g. Therefore, this study provides a promising strategy to simultaneously control highly toxic Cr(VI) and sulfite, achieving high-grade sulfur resource recovery for wet magnesia desulfurization.

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Section: Resultssupporting

confidence: 80%

In Situ Reconstruction of Active Catalysis Sites Triggered by Chromium Immobilization for Sulfite Oxidation

Zhang

et al. 2023

Environ. Sci. Technol.

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“…Extending the width of the mesh surfaces to 8 and 10 mm allows to increase the ability to remove fine pollution in the cotton content to 99.94% and 100% in terms of the number of pollution, respectively, compared to the experimental options [13,14]. This can be seen in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The third and fourth group pollutions will be located within the elemental pieces of cotton and within the single-fiber seeds, respectively. According to the author, it is possible to clean the cotton from the dirt inside the elemental part by separating the cotton pieces into maximum single-fiber seeds [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…If the level of study of the influencing factors is analyzed, the design and geometric parameters of the cleaners and the optimal parameters of the factors included in the block of technological indicators are sufficiently studied.The factors that characterize cotton as an object of purification have been partially studied. An indicator characterizing the composition of the cotton structure was proposed, which was later found to be insufficient in studies [13,14].The effect of volumetric contamination of cotton on cleaning performance has been virtually unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the proportions of pollutions in cotton by weight and number

2023

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The article provides an analysis of the proportions of different selections and industrial varieties, harvest type in terms of size and number of pollutions in the cotton. The problem of the formation of the force of binding of pollutions with the fiber was analyzed, and it was suggested that the main reason was the adhesion of the fiber to the bumps formed along the perimeter of the pollution. The experiments are based on the fact that the contamination and the contamination of cotton determined on the basis of cotton weights are the same, but their proportions are different in size. The possibility of separating fine pollutions in the cotton from the pile drums used in ginning plants was studied, and it was found that they can extract up to 93% of the total fine pollutions. Based on the comparative analysis, it was found that there is a significant difference in the weight and number fractions of pollutants by size. The effects of cotton selection and industrial variety, initial contamination, harvest type on the proportions of pollution by size. It was noted that the determination of cotton pollution by their weight ratio does not fully characterize cotton as an object of ginning, and on this basis there is a need to reconsider the issue of determining the plan of ginning of cotton based on the initial pollution.

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“…A polypyrrole (PPy)-modified natural core of corncob (PPy-NCC) was rationally fabricated for Cr(VI) removal from aqueous solution, and the adsorption capacity of PPy-NCC was several times higher than other bulk-style PPy composites due to its unique macroporous spongeous microstructure [ 169 ]. The co-pyrolysis and decomposition of cotton and polyester could obtain new biochar for the adsorption of Cr(VI), and the synergy effect contributed a lot to the efficient removal [ 170 ].…”

Section: Cr Removal: the Developed Adsorbentsmentioning

confidence: 99%

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

et al. 2023

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Emerging chromium (Cr) species have attracted increasing concern. A majority of Cr species, especially hexavalent chromium (Cr(VI)), could lead to lethal effects on human beings, animals, and aquatic lives even at low concentrations. One of the conventional water-treatment methodologies, adsorption, could remove these toxic Cr species efficiently. Additionally, adsorption possesses many advantages, such as being cost-saving, easy to implement, highly efficient and facile to design. Previous research has shown that the application of different adsorbents, such as carbon nanotubes (carbon nanotubes (CNTs) and graphene oxide (GO) and its derivatives), activated carbons (ACs), biochars (BCs), metal-based composites, polymers and others, is being used for Cr species removal from contaminated water and wastewater. The research progress and application of adsorption for Cr removal in recent years are reviewed, the mechanisms of adsorption are also discussed and the development trend of Cr treatment by adsorption is proposed.

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Co-pyrolysis of polyester and cotton via thermogravimetric analysis and adsorption mechanism of Cr(VI) removal by carbon in aqueous solution

Cited by 20 publications

References 55 publications

In Situ Reconstruction of Active Catalysis Sites Triggered by Chromium Immobilization for Sulfite Oxidation

In Situ Reconstruction of Active Catalysis Sites Triggered by Chromium Immobilization for Sulfite Oxidation

Analysis of the proportions of pollutions in cotton by weight and number

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

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