The Cu(II)-mediated activation of peroxymonosulfate (PMS) has been studied for the degradation of contaminants due to its ability to produce reactive species.However, the yield of reactive species generated from Cu(II)/PMS is relatively low under acidic conditions due to the slow conversion rate of metal valence states, which limits its application prospects.Herein, we found that the introduction of hydroquinone (HQ) in the Cu(II)/PMS system can accelerate the activation of PMS by promoting the redox cycling of Cu(II)/Cu(I), thereby achieving efficient destruct of sulfonamide antibiotics.The degradation rate constants of six sulfonamide antibiotics by HQ/Cu(II)/PMS system was 5-8 times of that by Cu(II)/PMS system under pH 3.0.Both hydroxyl radical (HO.) and singlet oxygen (1O₂) participated in the degradation of sulfamethoxazole (SMX, a representative sulfonamide antibiotic), and the former played the most important role.HQ improved the reduction of Cu(II) to Cu(I) due to the electron-donating capacity of hydroxyl in HQ, thereby promoting PMS decomposition to produce more HO. under acidic conditions.The presence of humic acid (HA) and low concentration of Cl^- presented the inhibitory effect on SMX degradation, while the degradation of SMX was promoted in the presence of high concentration of Cl^-.The addition of NO₃^- and SO₄^2- has almost no effect on the removal of SMX.The degradation pathways of SMX by HQ/Cu(II)/PMS system mainly involved in the S-N cleavage and amino oxidationThe significant enhancement effects were still observed in actual wastewater treatment by Cu(II)/PMS system after introduction of HQ.

01 Apr 2025·Food Chemistry

Non-targeted and targeted detection of hydrophilic compounds in fu brick tea: A study on samples from major Chinese production regions and different processing stages

Article

Author: Huang, Jianan ; Xu, Junren ; Yuan, Yong ; Yin, Feiyan ; Zhao, Mengmeng ; Li, Na ; Liu, Zhonghua ; Zhu, Mingzhi ; Zhao, Yiqiao ; Wang, Kunbo ; Chao, Jin

Systematic research is still lacking on the content of hydrophilic compounds in Fu Brick Tea (FBT) from major Chinese production regions and their variation patterns during the processing of FBT. This study utilized optimized non-targeted (UHPLC-Q-Exactive Orbitrap-MS) and targeted (UHPLC-QqQ-MS) metabolomics to analyze 73 FBT samples from six regions of China and 30 samples from different stages of FBT processing. 573 and 74 hydrophilic compounds were respectively relatively and absolutely quantified for the first time. Among the 73 FBT samples, alkaloids were the most abundant (26221.76-36701.75 mg/kg), followed by soluble sugars (211372.59-26112.85 mg/kg), organic acids (17014.07-23589.20 mg/kg), amino acids (6664.59-9791.46 mg/kg), nucleotides (1020.33-2175.16 mg/kg), and nucleoside (650.86-1446.26 mg/kg). During the processing of FBT, sugars, acids, nucleotides, and nucleosides increased, while amino acids decreased, and alkaloids slightly increased. This study enhances the understanding of hydrophilic compounds in FBT.

01 Apr 2025·Applied Surface Science

Highly reproducible nanofilms assembled from quaternary ammonium polymer-functionalized graphene oxide and gold nanoparticles for sensitive SERS detection of antibiotics

Author: Xu, Hui ; You, Jinqing ; Rong, Xiaoyi ; Geng, Lin ; Yang, Wenzhong ; Gong, Shaojie

Surface-enhanced Raman scattering (SERS) stands out as a valuable tool for the rapid and precise detection of trace antibiotics.However, preparing SERS substrates with high sensitivity, homogeneity, and good stability remains a great challenge.In this study, we chem. functionalized graphene oxide (GO) with poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) through surface-initiated atom transfer radical polymerization (SI-ATRP) technique.Then, GO-g-qPDMAEMA was obtained by quaternization (the quaternized PDMAEMA is denoted as qPDMAEMA).Using a water/oil interface self-assembly approach, we fabricated GO-g-qPDMAEMA/AuNPs nanofilms by interfacial assembly between GO-g-qPDMAEMA in chloroform and AuNPs in water.The nanofilms exhibited remarkable SERS characteristics, including exceptional sensitivity, good homogeneity, reproducibility, and stability.Addnl., two commonly used antibiotics, i.e., sulfamonomethoxine (SMM) and enrofloxacin (ENR) were rapidly and sensitively detected using the prepared GO-g-qPDMAEMA/AuNPs nanofilms as a SERS platform.The developed GO-g-qPDMAEMA/AuNPs nanofilms hold significant promise for food safety monitoring and environmental anal.

100 Deals associated with Sulfamonomethoxine

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