Synchronous removal of Cr(VI) and phosphates by a novel crayfish shell biochar-Fe composite from aqueous solution: Reactivity and mechanism

Liu, Yan; Dong, Fu-Xin; Yu, Li; Guo, Pengran; Kong, Lingjun; Chu, Wei; Diao, Zeng-Hui

doi:10.1016/j.jece.2022.107396

Cited by 33 publications

(3 citation statements)

References 55 publications

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“…The adsorption capacity increased rapidly at the first 5 h and almost reached saturation at 18 h. The findings demonstrated that the kinetic data had a superior fit with the Elovich model (R 2 = 0.99). Moreover, the value of α was higher than β, indicating that the phosphate adsorption mainly depended on the early surface adsorption [ 41 ]. In addition, the high R 2 values (R 2 > 0.8) of the pseudo-second-order kinetic model suggested that chemisorption played an important role in adsorption process.…”

Section: Resultsmentioning

confidence: 99%

Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar

Ding

Long

Zeng

et al. 2023

IJERPH

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The excessive application of phosphate fertilizers easily causes water eutrophication. Phosphorus recovery by adsorption is regarded as an effective and simple intervention to control water bodies’ eutrophication. In this work, a series of new adsorbents, layered double hydroxides (LDHs)-modified biochar (BC) with different molar ratios of Mg2+ and Fe3+, were synthesized based on waste jute stalk and used for recycling phosphate from wastewater. The prepared LDHs-BC4 (the molar ratio of Mg/Fe is 4:1) has significantly high adsorption performance, and the recovery rate of phosphate is about 10 times higher than that of the pristine jute stalk BC. The maximum adsorption capacity of LDHs-BC4 for phosphate was 10.64 mg-P/g. The main mechanism of phosphate adsorption mainly includes electrostatic attraction, ion exchange, ligand exchange, and intragranular diffusion. Moreover, the phosphate-adsorbed LDHs-BC4 could promote mung bean growth, which indicated the recovery phosphate from wastewater could be used as a fertilizer.

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Section: Resultsmentioning

confidence: 99%

Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar

Ding

Long

Zeng

et al. 2023

IJERPH

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“…Under acidic conditions, these groups consume protons (H + ) from the solution, partially reducing Cr(VI) to Cr(III). As the solution becomes less acidic, the availability of H + diminishes, adversely affecting the adsorbent's performance [22]. (3) With increasing pH, the concentration of -OH groups increases, leading to competition between the -OH radicals and Cr(VI) ions for adsorption sites on the adsorbent's surface.…”

Section: Phmentioning

confidence: 99%

Preparation of PVA/SA-FMB Microspheres and Their Adsorption of Cr(VI) in Aqueous Solution

Zuo,

Ren,

Jiang

et al. 2024

Processes

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Biochar, a carbon-dense material known for its substantial specific surface area, remarkable porosity, diversity of functional groups, and cost-effective production, has garnered widespread acclaim as a premier adsorbent for the elimination of heavy metal ions and organic contaminants. Nevertheless, the application of powdered biochar is hindered by the challenges associated with its separation from aqueous solutions, and without appropriate management, it risks becoming hazardous waste. To facilitate its use as an immobilization medium, biochar necessitates modification. In this investigation, sodium alginate, celebrated for its superior gelation capabilities, was amalgamated with polyvinyl alcohol to bolster mechanical robustness, thereby embedding biochar to formulate sodium alginate biochar microspheres (PVA/SA-FMB). A meticulously designed response surface methodology experiment was employed to ascertain the optimal synthesis conditions for PVA/SA-FMB. Characterization outcomes unveiled a highly developed surface abundant in functional groups and confirmed the successful incorporation of iron ions. Adsorption trials revealed that at a temperature of 25 °C and a pH of 2, the adsorption capacity of PVA/SA-FMB for Cr(VI) was 13.7 mg/g within the initial 30 min, reaching an equilibrium capacity of 26.03 mg/g after 1440 min. Notably, the material sustained a Cr(VI) removal efficiency exceeding 90% across five cycles, underscoring its rapid and effective Cr(VI) eradication performance. Kinetic and isothermal adsorption analyses suggested that the adsorption of Cr(VI) adheres to a pseudo-second-order kinetic model and the Freundlich isotherm, indicative of monolayer adsorption dominated by reaction mechanisms. X-ray photoelectron spectroscopy (XPS) analysis inferred that the adsorption mechanism predominantly encompasses electrostatic attraction, redox processes, and complex formation.

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“…Additionally, an adsorption–reduction synergistic effect could be achieved by some adsorbents [ 79 , 134 ]. A ternary magnetic composite containing graphene oxide (GO), diethylenetriamine and Fe 3 O 4 nanoparticles was developed, and the maximum adsorption capacity of 123.4 mg/g toward Cr(VI) was much higher than that of magnetic GO.…”

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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Synchronous removal of Cr(VI) and phosphates by a novel crayfish shell biochar-Fe composite from aqueous solution: Reactivity and mechanism

Cited by 33 publications

References 55 publications

Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar

Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar

Preparation of PVA/SA-FMB Microspheres and Their Adsorption of Cr(VI) in Aqueous Solution

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

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