Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
The widely used rubber antioxidant N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD) and its ozonated product, 6PPD-quinone (6PPD-Q), are highly toxic to aquatic life, yet understanding on their environmental behaviors is limited. This study comprehensively investigated their adsorption and transformation processes on natural Fe-Mn nodules (NFMN), which commonly exist in sediments and soils through a combination of diverse experimental and computational methods. The maximum adsorption capacity of 6PPD-Q (719.2 μg·g) is significantly higher than that of 6PPD (133.8 μg·g) at 293 K, and it is more difficult to desorb. They follow different kinetic and isothermal adsorption models, and environmental conditions (including temperature, pH, and anions) exert distinct influences on the adsorption of the two substances. Adsorption mechanisms involving electrostatic attraction, charge transfer, hydrogen bonding, and Lewis acid-base complexation were unveiled. For 6PPD, electrostatic adsorption and Lewis acid-base complexation contribute significantly to its adsorption. Conversely, for 6PPD-Q, the contribution of Lewis acid-base complexation outweighs that of hydrogen bonding, while the effect of electrostatic adsorption is relatively negligible. The stronger electrostatic attraction, more efficient charge transfer, and a greater number of binding sites for hydrogen bonding and Lewis acid-base complexation with NFMN results in more robust adsorption of 6PPD-Q. Furthermore, 6PPD can transform into 6PPD-Q on NFMN, facilitated by dissolved Mn(III). This study advances understanding of the adsorption behavior and mechanism of 6PPD and 6PPD-Q, and highlights a new pathway for 6PPD-Q formation, which provides valuable reference for assessing the water body exposure risks and formulating environmental remediation strategies for such pollutants. ENVIRONMENTAL IMPLICATION: This study offers the first comprehensive insight into the interactions between 6PPD/6PPD-Q and NFMN, illuminating their environmental behavior in water and soil systems. It reveals the adsorption discrepancy between 6PPD and 6PPD-Q, and elucidates the mechanisms underlying the difference in adsorption. Additionally, it uncovers a novel pathway for 6PPD-Q formation, offering valuable implications for risk assessment and environmental remediation strategies.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.envint.2025.109438 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Photofunctionalization of Light Alkanes by FeO/BCN at 12 °C.
J Am Chem Soc
September 2025
State Key Laboratory of Chemistry for NBC Hazards Protection, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China.
The activation of methane and other gaseous hydrocarbons at low temperature remains a substantial challenge for the chemistry community. Here, we report an anaerobic photosystem based on crystalline borocarbonitride (BCN) supported Fe-O nanoclusters, which can selectively functionalize C-H bonds of methane, ethane, and higher alkanes to value-added organic chemicals at 12 °C. Scanning transmission electron microscopy and X-ray absorption spectroscopy corroborated the ultrafine FeOOH and FeO species in Fe-O clusters, which enhanced the interfacial charge transfer/separation of BCN as well as the chemisorption of methane.
View Article and Find Full Text PDFMultifunctional Binding Interface Drives Near-Unity CO Selectivity in Acidic CO Electrolysis.
Angew Chem Int Ed Engl
September 2025
Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, 21218, USA.
The electrocatalytic carbon dioxide (CO) reduction is challenged by the parasitic hydrogen evolution reaction (HER) especially in acidic media. Here, we elaborate that redox-active isoindigo, acting as a multifunctional co-catalyst, can pre-activate CO-bound intermediates and suppress HER upon the synergistic effects of Lewis acid-base adduct formation, intramolecular hydrogen-bond interaction, and interfacial water structure modulation. Modifying a silver catalyst with isoindigo substantially decreases the energy barrier for CO-to-*COOH conversion, which is regarded as the potential-limiting step of carbon monoxide production.
View Article and Find Full Text PDFSynergistic enhancement of chitosan-diatomite composite in microalgae flocculation: Mechanistic insights into extracellular polymeric substances-mediated harvesting.
Int J Biol Macromol
September 2025
School of Resource and Environmental Sciences, Hubei Key Laboratory of Biomass-Resources Chemistry and Environmental Biotechnology, Wuhan University, Wuhan, 430079, China.
Chitosan is a promising bioflocculant for harvesting microalgae, its practical implementation is constrained by high dosage demands (typically >1 g/L) and suboptimal settling kinetics. And the microalgae harvesting process is susceptible to the significant influence of extracellular polymeric substances (EPS), the mechanism of which is still unclear. This study synthesized amino-functionalized chitosan-diatomite composites (APTES-CTS/DTE) and revealed the action mechanism of EPS in the flocculation of microalgae.
View Article and Find Full Text PDFSodium Alginate Launches MOF Defective Structures to Rapidly Construct Highly AChE-Like Nanozyme for Neuroprotection.
Small Methods
September 2025
CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicines of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, P. R. China.
Organophosphorus (OP) nerve agents cause neurotoxicity through irreversible inhibition of acetylcholinesterase (AChE), while conventional therapeutic strategies are inadequate to fully restore cholinergic function. Artificial enzymes with AChE-like activity are urgently needed to provide sustainable catalytic capacity to address this limitation. Guided by the acid-base synergistic catalytic mechanism of the ester hydrolysis reaction, the 29-ZIF-8/SA composite with excellent AChE-like activity is successfully constructed by a defect engineering strategy with sodium alginate (SA) as a modulator.
View Article and Find Full Text PDFAdjusting Chemical Hardness-Softness Balance of Electrolyte to Enable High-Voltage Reversible Fluoride Ion Batteries.
Angew Chem Int Ed Engl
September 2025
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 585 He Shuo Road, Shanghai, 201899, China.
Fluoride ion batteries (FIBs), as a promising next-generation high-energy-density storage technology, have attracted significant attention. However, developing an ideal fluoride-ion electrolyte that suppresses the β-H abstraction (caused by strong Lewis-basicity F) and electrolyte decomposition remains challenging. To address this bottleneck, we design an electrolyte system based on commercial tetrabutylammonium fluoride (TBAF) salt and 1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF) ionic liquid solvent through anion-cation coordination engineering and hard-soft-acid-base (HSAB) balance modulation, unveiling its multiscale mechanisms for mitigating interfacial parasitic reaction and enhancing metal anode stability.
View Article and Find Full Text PDF