AI Article Synopsis
Article Abstract
In this study, the removal of perchlorate (0.016mM) using Fe(0)-only (325 mesh, 10g L(-1)) and Fe(0) (10g L(-1)) with UV (254nm) reactions were investigated under oxic and anoxic conditions (nitrogen purging). Under anoxic conditions, only 2% and 5.6% of perchlorate was removed in Fe(0)-only and Fe(0)/UV reactions, respectively, in a 12h period. However, under oxic conditions, perchlorate was removed completely in the Fe(0)-only reaction, and reduced by 40% in the Fe(0)/UV reaction, within 9h. The pseudo-first-order rate constant (k(1)) was 1.63×10(-3)h(-1) in Fe(0)-only and 4.94×10(-3)h(-1) in Fe(0)/UV reaction under anoxic conditions. Under oxic conditions, k(1) was 776.9×10(-3)h(-1) in Fe(0)-only reaction and 35.1×10(-3)h(-1) in the Fe(0)/UV reaction, respectively. The chlorine in perchlorate was recovered as chloride ion in Fe(0)-only and Fe(0)/UV reactions, but lower recovery of chloride under oxic conditions might due to the adsorption/co-precipitation of chloride ion with the iron oxides. The removal of perchlorate in Fe(0)/UV reaction under oxic conditions increased in the presence of methanol (73%, 9h), a radical scavenger, indicating that OH radical can inhibit the removal of perchlorate. The removal of perchlorate by Fe(0)-only reaction under oxic condition was highest at neutral pH. Application of the Langmuir-Hinshelwood model indicated that removal of perchlorate was accelerated by adsorption/co-precipitation reactions onto iron oxides and subsequent removal of perchlorate during further oxidation of Fe(0). The results imply that oxic conditions are essential for more efficient removal of perchlorate in Fe(0)/H(2)O system.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jhazmat.2011.05.030 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A simple and cost-effective sample preparation and storage method for stable isotope analysis of atmospheric CO for GasBench II/continuous flow isotope ratio mass spectrometry.
Rapid Commun Mass Spectrom
February 2025
School of Earth, Environment & Society, McMaster University, Hamilton, ON, Canada.
Rationale: The stable isotope compositions of atmospheric CO can provide useful insight into various geochemical processes and carbon cycles on Earth, which is critical for understanding of Earth's changing climate. Here, we present a simple and cost-effective analytical method for the collection and measurement of carbon and oxygen isotope compositions of atmospheric CO.
Methods: Air samples of ~150 mL were collected individually or collectively using our simple active air collection system and then extracted on a vacuum purification line to remove noncondensable gases and atmospheric water vapor.
Combined sorption-biodegradation for removal of energetic compounds from stormwater runoff.
J Hazard Mater
November 2024
University of Delaware, Newark, DE 19716, USA.
Munition constituents (MC) in stormwater runoff have the potential to move these pollutants into receiving bodies at military installations. Here we present further evaluation of a passive and sustainable biofilter technology for removal of dissolved MC from simulated surface runoff by combined sorption-biodegradation processes under dynamic flow conditions. Columns were packed with MC sorbents Sphagnum peat moss and cationized (CAT) pine shavings with and without wood-based biochar.
View Article and Find Full Text PDFBidentate [C,N] and Tridentate [C,N,S] Palladium Cyclometallated Complexes as Pre-Catalysts in Cross-Coupling Reactions.
ChemistryOpen
November 2024
Departamento de Química Inorgánica, Universidad de Santiago de Compostela, E-, 15782, Santiago de Compostela, Spain.
Article Synopsis
- The study focuses on the synthesis of palladacycles (both dinuclear and mononuclear) using halide-substituted Schiff base ligands, which involve C-H activation when treated with palladium(II) compounds.
- Dinuclear complexes formed through metathesis with sodium chloride are converted into μ-chloride dinuclear complexes, which then react with phosphines to yield various phosphine derivatives.
- The synthesized compounds were characterized using techniques like microanalysis, spectroscopy, and X-ray diffraction, and their efficacy as pre-catalysts in the Suzuki-Miyaura cross-coupling reaction was evaluated, highlighting the best-performing complexes.
Combination of electro-oxidation and biological processes for lindane landfill leachate treatment: simultaneous degradation of contaminants and biological reduction of electro-generated chloride-derived by-products.
J Hazard Mater
November 2024
Water Science and Technology group (WaSTe), Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, Fisciano, SA 84084, Italy. Electronic address:
Real lindane landfill leachate (HCH-LL) is characterised by high chlorinated organic compounds concentrations (primarily hexachlorocyclohexane (HCH) isomers and degradation products generated during more than 40 years of ageing), posing environmental and human health risks. In this work, the co-treatment of real HCH-LL (pre-treated via electro-oxidation (EO)) and urban wastewater using an activated sludge process operated in an anoxic/oxic sequencing batch (A/O-SBR) mode was investigated. EO tests were conducted employing either a boron-doped diamond (BDD) anode or a dimensionally stable anode (DSA), resulting in effective HCH isomers removal (>93 % after 20 Ah/L).
View Article and Find Full Text PDFOccurrence and removal technologies of perchlorate in water: A systematic review and bibliometric analysis.
Chemosphere
September 2024
Department of Civil Engineering, Zhejiang University, 866 Yuhangtang Rd., Hangzhou, 310058, China; Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Zhejiang University, 866 Yuhangtang Rd., Hangzhou, 310058, China. Electronic address:
Article Synopsis
- The emergence of perchlorate as a contaminant poses a significant threat to water environments, prompting extensive research into treatment technologies.
- A systematic review of 551 articles (2000-2024) highlighted major contributions from countries like China, the U.S., and India, indicating a global interest in addressing this issue.
- Various remediation methods, along with their strengths and weaknesses, were evaluated, showing that while advanced technologies can improve perchlorate removal, challenges like low concentrations in water and high energy use remain to be resolved.
Want 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!