Hexavalent chromium (Cr(VI)) removal by ball-milled iron-sulfur @biochar based on P-recovery: Enhancement effect and synergy mechanism. (March 2023)

• Record Type: Journal Article
• Authors: Ai, Dan; Tang, Yani; Yang, Ruiming; Meng, Yang; Wei, Taiqing; Wang, Bo
• Is Part Of: Bioresource technology. Volume 371(2023)
• Publication Date: 2023-03
• Subjects: Ball-milled biochar -- Phosphorus recovery -- Cr(VI) removal -- Enhancement effect -- Synergy; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2023.128598
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The iron-sulfur biochar and its recovered phosphate act synergistically on Cr(VI) adsorption. Recovered phosphorus influenced the pore structure of iron-sulfur biochar significantly. The uptake mechanisms included physical adsorption, electrostatic attraction and precipitation. Sustainable strategies to prevent eutrophication, mitigate P crisis and enhance Cr(VI) removal. Abstract: After the biochar recovery of phosphorus (P), its role in eliminating Cr(VI) is uncertain. In this study, the iron-sulfur biochar (Fe/S@BC) was made by grinding Fe 0, S 0, and biochar with a ball mill. P-loaded iron-sulfur biochar (P-Fe/S@BC) was produced after recovering P from simulated wastewater and then used to remove Cr(VI) contamination in waterbodies. P-Fe/S@BC got a rich pore structure and more reactive sites through P-recovery. The experiments revealed that P-Fe/S@BC had an enhancement effect on Cr(VI) pollution with removal efficiencies of 76.9 % ∼ 99.4 %, all greater than Fe/S@BC (58.2 %). In particular, 25P-Fe/S@BC (with 6.55 mg P/g) had the most significant advantage. The combination of physical adsorption, electrostatic attraction, and precipitation contributed to Cr(VI) removal. This is an efficient strategy for reusing Fe/S@BC followed by P-recovery, intending to improve the Cr(VI) removal effect and achieve the sustainable use of P resources and wastes.