Membrane-less single-medium sediment microbial fuel cells (single-SMFC) can remove Cu from sediment through electromigration. However, the high mass transfer resistance of the sediment and amount of oxygen at the cathode of the SMFC limit its Cu removal ability. Therefore, this study used an oxygen-releasing bead (ORB) for slow oxygen release to increase oxygen at the SMFC cathode and improve the mass transfer property of the sediment. Resultantly, the copper removal efficiency of SMFC increased significantly. Response surface methodology was used to optimize the nano zero-valent iron (nZVI)-modified biochar as the catalyst to enhance the ability of the modified ORB (ORB) to remove Cu and slow release of O. The maximum Cu removal (95 %) and the slowest O release rate (0.41 mg O/d·g ORB) were obtained when the CaO content and ratio of nZVI-modified biochar to unmodified biochar were 0.99 g and 4.95, respectively. When the optimized ORB was placed at the single-SMFC cathode, the voltage output and copper removal increased by 4.6 and 2.1 times, respectively, compared with the system without ORB. This shows that the ORB can improve the migration of Cu in the sediment, providing a promising remediation method for Cu-contaminated sediments.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.bioelechem.2024.108699 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Synthesis and Characterization of Metal Particles Using Malic Acid-Derived Polyamides, Polyhydrazides, and Hydrazides.
Molecules
December 2024
School of Life Science, Shanxi University, Taiyuan 030006, China.
Malic acid-derived polyamides, polyhydrazides, and hydrazides exhibit strong potential for a variety of biological applications. This study demonstrates the synthesis of cobalt, silver, copper, zinc, and iron particles by a facile chemical reduction approach utilizing malic acid-derived polyamides, polyhydrazides, and hydrazides as stabilizing and reducing agents. Comprehensive characterization of the particles was performed using UV-Vis spectroscopy, FTIR, XRD, SEM, and EDX analysis.
View Article and Find Full Text PDFEfficient activation of persulfate by copper-coated nano zero-valent iron for degradation of nitrogenous disinfection by-products: The key role of Cu.
J Colloid Interface Sci
January 2025
College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou, Fujian 350118, China. Electronic address:
The essential shortcoming of rapid passivation deactivation limits the efficient application of nano zero-valent iron (nZVI) in eliminating disinfection byproducts from drinking water. Copper-coated nano zero-valent iron (Cu-nZVI) bimetallic composites were synthesized to efficiently activate persulfate (PS) to remove nitrosopyrrolidine (NPYR). By introducing Cu-coated coatings, nZVI is protected from direct contact with PS; thus, Cu-nZVI appears to activate PS efficiently and stably without rapid deactivation.
View Article and Find Full Text PDFThe morphology and structure of zero-valent iron nanosheets promote the activation of persulfate for degradation of ciprofloxacin.
Environ Res
January 2025
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin 300457, P.R. China.
Herein, a biochar-supported zero-valent iron (ZVI) nanosheet catalyst (Fe@BC) for the activation of persulfate to degrade ciprofloxacin (CIP) was prepared using industrial kraft lignin and Fenton sludge as carbon and iron sources, respectively. Fe@BC showed considerably better CIP degradation efficiency (96.9% at 20 mg·L) than traditional catalysts.
View Article and Find Full Text PDFIntegrated removal of chromium, lead, and cadmium using nano-zero-valent iron-supported biochar: Mechanistic insights and eco-toxicity assessment.
Ecotoxicol Environ Saf
January 2025
College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, PR China; Gansu Provincial Key Laboratory of Arid land Crop Science, Gansu Agricultural University, Lanzhou 730070, PR China. Electronic address:
The contamination of water and soil by heavy metals (HMs) is a global issue that should be given much more concern. Modified nano-zero-valent iron (nZVI) composites offer an effective strategy for HMs remediation, but few studies have focused on removing coexisting HMs and the eco-toxicity of the composite. In this study, corn straw biochar-supported nZVI composites (nZVI-BC) were synthesized, characterized and used for the removal of Cr, Pb, and Cd in single and multi-system at different composites dosages, metal concentrations, and solution pH.
View Article and Find Full Text PDFNano zero-valent iron with a self-forming Co-catalytic surface for enhanced Fenton-like reactions.
Environ Res
December 2024
School of Chemistry and Chemical Engineering, Hainan University, Haikou, 570228, China. Electronic address:
Fenton reactions, commonly employed in environmental remediation, decompose H₂O₂ using Fe⁺ to generate free radicals. However, the efficiency is often limited by the slow conversion of Fe³⁺ to Fe⁺. In this study, we synthesize zero-valent iron nanoparticles (nZVI) via a green, plant extract-mediated reduction method, resulting in nZVI coated with a reductive polyphenolic layer that enhances Fe³⁺/Fe⁺ cycling.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!