Nanomaterials
·
2025
·Vol. 15
·期 13
·976
·
IF 4.3
Jingjing Jia,Xue Liu,Wenjing Wang
Nitrogen-doped carbon dots (NCDs) exhibiting superior fluorescence characteristics were synthesized employing o-phenylenediamine and 2-methylimidazole as precursors. The synthesized NCDs exhibited yellow photoluminescence with an excitation/emission maxima of 410/554 nm with a quantum yield of 28.41%. The presence of pyridinic N, pyrrolic N, graphitic N, and amino N functionalities on the NCDs’ surface provided strong evidence for the successful nitrogen doping of the carbon dots. Upon exposure to hydrogen peroxide (H2O2), the NCDs exhibited a significant reduction in fluorescence intensity, which could be restored by the addition of ascorbic acid (AA), demonstrating a quantitative relationship between ascorbic acid and fluorescence efficiency. A novel fluorescence “off–on” system utilizing these NCDs was developed for the quantification of AA. The sensing mechanism relies on H2O2-induced fluorescence quenching via the selective oxidation of the NCDs’ surface, followed by fluorescence restoration upon AA addition due to the reduction in surface defects. Meanwhile, further experiments confirmed that the quenching mechanism was static quenching. The NCDs demonstrated a limit of detection (LOD) of 0.605 μM for AA detection. The use of NCDs for AA sensing was validated through the analysis of commercially available beverages. This study aimed to establish a simplified method for ascorbic acid detection. The experimental findings indicated that the developed technique exhibited high accuracy in quantifying ascorbic acid. These findings suggest that the developed NCDs possess considerable potential as a multifunctional sensing tool for various analytical applications.
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DOI
PubMed
高影响因子
Water Cycle
·
2025
·
IF 8.7
Rui Miao,Yanfei Li,Xin Zhang,Haoxue Ran,Yifan Yang,Jinwen Wang,Lei Wang,Xiaorong Meng,Danxi Huang
Efficient and cost-effective removal of emerging contaminants from water bodies has become a global priority. This study assessed the degradation efficiency of bisphenol-A (BPA) at varying Fe 2+ &H 2 O 2 (molar ratio 1:1) concentrations. In addition, the degradation mechanism of BPA by Fe 2+ &H 2 O 2 and the evolution of toxicity in intermediates were examined. The results indicated that, no additional acid is needed, with a Fe 2+ &H 2 O 2 concentration at 0.15 mM and a reaction time of 20 min, and the degradation efficiency of BPA exceeded 90%; this is primarily because the oxidation still occurred when Fe 2+ &H 2 O 2 was added to neutral BPA solutions, possibly leading to the conversion of the active functional groups of BPA into carboxyl groups. The deprotonation of these carboxyl groups provided the acidic conditions necessary for Fenton oxidation, thereby possibly facilitating further degradation of BPA and the formation of more carboxyl-rich intermediates, replenishing acidity for Fenton reactions and promoting continuous oxidation. Moreover, highly toxic intermediates are likely to form during the degradation of BPA at a 0.05-0.1 mM Fe 2+ &H 2 O 2 concentrations, but this tendency decreases substantially with increasing Fe 2+ &H 2 O 2 concentrations. At a Fe 2+ &H 2 O 2 concentration of 0.2 mM, the intermediates were predominantly low-toxicity or even nontoxic. These findings highlight the importance of monitoring toxicity evolution and the conditions favorable for the formation of low-toxic or nontoxic intermediates in the removal of emerging contaminants. To further validate the applicability of this method, p-chloroxylenol (PCMX) and paracetamol (PAM) were also tested under identical conditions, and both showed high degradation efficiencies under neutral pH.
研究领域:
环境科学
·
化学
·
毒理学
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高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Abdul Qadir,Adeel Ahmed,Pervaiz Ahmad,Aisha H. Albalawi,Zahrah Alqahtani,Haia H. Aldosari,Raza Ullah,A. Timoumi,Awais Khalid
Metal–organic frameworks (MOFs) have currently attracted interest as effective self-sacrificial templates for the fabrication of hierarchical porous metal–nanoparticle materials. This study involved the synthesis of Cu-based MOF-loaded polyacrylonitrile (MOF/PAN) fibers using electrospinning, subsequently subjected to calcination in a nitrogen environment to yield Cu nanoparticle-loaded carbon nanorods (Cu@CNRs) as heterogeneous catalysts. The catalytic performance of prepared Cu@CNRs was investigated via hydrogen peroxide (H 2 O 2 ), peroxydisulfate (S 2 O 8 2− ), and peroxymonosulfate (HSO 5 − ) activated degradation of sulfamethoxazole (SMX). The activation performance of Cu@CNRs followed the sequence: HSO 5 − > S 2 O 8 2− > H 2 O 2 , indicating that HSO 5 − was the most effective oxidant under identical conditions. The Cu@CNR-I/HSO 5 − system demonstrated exceptional efficacy, attaining 99.99 % SMX removal in 30 min and a significant rate constant of 0.2312 min −1 . The improved activity is due to the hierarchical porous structure, elevated surface area, plentiful active sites, and robust Cu-N-C/HSO 5 − synergy. The carbonization created a polarization disparity in Cu N coordination, thereby promoting PMS activation by Cu(I/II) species. Radical quenching and EPR tests revealed that SO₄ •- and OH • radicals predominated the degradation route. The primary operating factors, such as catalyst and oxidant dose, solution pH, SMX concentration, coexisting anions, and humic acid, were carefully examined. The catalyst Cu@CNR-I exhibited remarkable catalytic stability and reusability over five cycles, indicating significant potential as a sustainable heterogeneous catalyst for wastewater treatment applications.
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高影响因子
MATERIALS TECHNOLOGY
·
2015
·
IF 1.227
F.-B. Meng,H. Xu,W. Li,Q.-W. Liu,S.-M. Gao,X.-C. Ji,Q. Xu,Y. Kong
In this paper, a simple, one-step chemical synthesis of Au@poly(m-phenylenediamine) (PMPD) core-shell nanoparticles by direct dropping aqueous chloroauric acid aqueous solution to m-phenylenediamine aqueous solution was reported, which is a facile and green method. We further evaluate the use of the obtained Au@PMPD to modify glassy carbon electrode and for H2O2 electrocatalytic biosensing. The results indicate that the aggregated small Au nanoparticles in the inner part of PMPD could be an ideal sensing platform for H2O2 detection.
研究领域:
材料科学
·
分析化学
·
生物传感
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高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Sang Zhiyuan,Qiao Yuqian,Chen Rui,Yin Lichang,Hou Feng,Liang Ji
Tailoring the electronic structure of electrocatalysts for oxygen reduction reaction (ORR) has been widely adopted to optimize their performance. However, the steric effect originating from the layered or crystal structure of a catalyst is often neglected. Herein, we demonstrate the importance of such steric effect in a one-dimensional π-d conjugated metal-organic framework with Ni-(NH) 4 nodes (Ni-BTA) for optimizing its electrocatalytic performance, where the activity and selectivity towards two-electron ORR for H 2 O 2 production are largely enhanced. Theoretical simulation and in-situ characterization demonstrate the formation of inter-layer H-bonds between *OOH intermediates and -N-H groups in the adjacent top layers of the Ni-sites, enhancing the *OOH binding energy to an optimum value. Thus, the as-prepared Ni-BTA catalyst exhibits an outstanding electrocatalytic 2e − -ORR performances under neutral and alkaline conditions (e.g., >85% H 2 O 2 selectivity from −0.1-0.4 V vs. RHE and >13.5 mol g −1 h −1 H 2 O 2 yield in neutral electrolytes), also showing great potential on water treatment and disinfection. Here, we highlight the alternative avenues for utilizing the non-coordinated structure to regulate the catalytic performance, thus providing opportunities for the design of catalysts and beyond.
研究领域:
材料科学
·
电化学
·
催化
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PubMed
高影响因子
ACS ES&T Engineering
·
2025
·
IF 6.7
Yaqiong Luo,Jiacheng Bao,Xin Yan,Lei Shi,Fei Wang,Xin Sun,Kai Li,Ping Ning
Wet flue gas denitrification offers a new route for converting industrial nitrogen oxides (NOx) into highly concentrated nitrate wastewater. This study presents a novel H2O2-based advanced oxidation process that utilizes the composite calcined phosphate rock to activate H2O2 for efficient NOx removal. The calcination treatment for composite phosphate rocks was found to enhance de-NOx efficiency and capacity by varying the CaMg(CO3)2 and Ca5(PO4)3OH contents and creating oxygen vacancies. A systematic investigation of the phase structural evolution under alkaline H2O2 conditions identified CaMg(CO3)2 and Ca5(PO4)3OH as the primary active components, with CaMg(CO3)2 preferentially participating in the reaction. Radical quenching experiments and time-resolved electron paramagnetic resonance (EPR) analysis confirmed the predominant roles of superoxide radicals (O2•–) and surface-bound hydroxyl radicals (•OHsurface) in NOx oxidation. A mechanistic pathway was proposed, highlighting the synergistic effects of reactive oxygen species (ROS) and mineral phase transitions on NOx removal. The proposed NOx purification method offers a promising option for nitrogen recovery and NOx pollution control.
研究领域:
环境科学
·
化学工程
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高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Xu Jing,Gu Kaiye,Wang Peifang,Cheng Pengfei,Che Huinan,Tang Chunmei,Zhang Kan,Ao Yanhui
Hydroxyl radicals (·OH) is one of the most important reactive oxygen species (ROSs) for organic pollution controlling in advanced oxidation processes, while its production suffers from numerous H 2 O 2 addition and narrow pH range in generally used Fenton reaction. Herein, we demonstrate a BiOIO 3 (BIO) piezo-catalyst loaded with γ-FeOOH nanoparticles (FNPs) (BF) that can convert O 2 to ·OH in a wide pH condition without external H 2 O 2 addition under ultrasonication. It is found that the robust interfacial interaction facilitates rapid electron migration from BIO to FNPs, enabling two-electron O 2 reduction into H 2 O 2 at the FNPs site, while the leaving behind piezo-holes to perform two-electron water oxidative H 2 O 2 generation on BIO. Because the electron-rich nature of FNPs favors the H + adsorption that contributes a surface acidic micro-environment, the produced H 2 O 2 can be in-situ catalyzed into ·OH in either neutral or even alkaline conditions with a great stability. Finally, the optimal BF can achieve either an impressive ·OH yield of 38.1 µM h −1 or a high H 2 O 2 yield of 522.0 µM h −1 by regulating the FNPs loading mass, which enables dual capabilities of rapid organic pollutants degradation and H 2 O 2 production in a wide pH condition.
研究领域:
环境科学
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催化
·
高级氧化工艺
·
材料科学
·
化学工程
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2026
·
IF 0
Zhou Baochang,Li Guifang,Pan Zhangbin,Dong Bin,Du Zhenqi,Zhang Baiqiang,Li Mei,Wang Yonglei,Jia Ruibao
At present, the most commonly used advanced oxidation technology for drinking water treatment has the disadvantage of low utilization rate of oxidant. After research and comparison, the UV/H 2 O 2 /Fe(III) combined process selected in this study can effectively degrade sulfamethoxazole (SMX) in water and improve the utilization rate of hydrogen peroxide. The results showed that the removal rate of SMX by UV/H 2 O 2 /Fe(III) process was 96.7%, and the utilization rate of H 2 O 2 was increased by 25%; the UV/H 2 O 2 /Fe(III) combined process also had a good effect on the degradation of fluorescent components and other organic matter in water; the presence of nitrite ion and humic acid significantly reduced the degradation efficiency of SMX, under the condition of nitrite ion concentration of 5 mg/L or humic acid concentration of 10 mg/L, the removal rate of SMX by UV/H 2 O 2 /Fe(III) combined process decreased by 10.68% or 11.92%, respectively. In terms of mechanism research, the reactivity of SMX molecules was theoretically calculated by density functional theory (DFT), and the atoms with higher contribution rate were calculated, and the degradation products and four degradation pathways of SMX were identified and analyzed by mass spectrometry. Finally, the potential ecological toxicity of SMX and its degradation products was predicted by ECOSAR software and luminescent bacteria experiments; it was found that the toxicity of SMX and its degradation products was relatively high at 15 min.
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PubMed
DESALINATION
·
2026
·
IF 9.8
Huazhen Rong,Jiashun Mao,Yue Ma,Xiaohui Yan,Min Luo,Handan Wen,Tao Liu,Yihui Yuan,Ning Wang
Uranium-contaminated water streams associated with nuclear fuel cycle operations represent an emerging challenge in water purification, combining radiological risk with the opportunity for resource recovery. Developing sustainable uranium removal technologies that operate under mild conditions while minimizing chemical inputs remains a critical task, particularly for integration into advanced water treatment systems. Herein, we report a donor-acceptor covalent organic framework (DANT-TFPT) featuring an in-framework coupled H 2 O 2 production and consumption (IFC-HPC) architecture for photocatalytic uranium removal. By co-localizing oxygen reduction reaction catalytic sites and uranyl-binding pockets within a single scaffold, photogenerated H 2 O 2 is produced and consumed in-situ, minimizing diffusion losses and nonproductive decomposition. Together with strong donor-acceptor coupling and abundant N/O-rich coordination domains, the DANT-TFPT exhibits a high H 2 O 2 evolution rate under ambient air to achieve an exceptional U(VI) uptake capacity of 745.7 mg g −1 with a fast removal rate of 67.8 mg g −1 h −1 without sacrificial reagents in uranium-contaminated wastewater. This study demonstrates a chemical-efficient and environmentally benign strategy for the removal and recovery of uranium from contaminated waters, highlighting the potential of integrated photocatalytic-sorptive materials for emerging contaminant control and resource recovery in water purification and desalination-related treatment processes.
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高影响因子
SURFACE REVIEW AND LETTERS
·
2015
·
IF 0.38
MINGSHU XIAO,YUHUA YAN,KAI FENG,YANPING TIAN,YUQING MIAO
A new electrochemical technique to detect hydrogen peroxide ( H 2 O 2 ) was developed. The Pt nanoparticles and Bi III were subsequently assembled on agmatine sulfate (AS) modified glassy carbon electrode (GCE) and the prepared GCE–AS- Pt – Bi III was characterized by scanning electron microscopy (SEM) with result showing that the flower-like nanostructure of Pt – Bi III was yielded. Compared with Pt nanoparticles, the flower-like nanostructure of Pt – Bi III greatly enhanced the electrocatalysis of GCE–AS- Pt – Bi III towards H 2 O 2 , which is ascribed to more Pt – OH obtained on GCE–AS- Pt – Bi III surface for the presence of Bi III . Based on its high electrocatalysis, GCE–AS- Pt – Bi III was used to determine the content of H 2 O 2 in the sample of sheet bean curd with standard addition method. Meantime, its electrocatalytic activity also was studied.
研究领域:
电化学
·
纳米材料
·
传感器与生物传感器
·
分析化学
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DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Kaile Tian,Dejian Li,Tingting Tang,Fei Nie,Yang Zhou,Jianxiu Du,Jianbin Zheng
Luminol-nitrogen doped graphene quantum dot (luminol-NGQDs) nanocomposite was synthesized and a novel electrochemiluminescence resonance energy transfer (ECL-RET) process occurred between luminol as the donor and NGQDs as the acceptor in the composite. This ECL-RET effect helped luminol-NGQDs composite produced an anodic ECL signal without coreactants. The ECL-RET mechanism was also studied based on the fluorescence spectra, the ultraviolet–visible absorption spectra and the electrochemiluminescence (ECL) spectra. Based on the significant sensitization effect of hydrogen peroxide on luminol-NGQDs ECL signal, an ECL method for the sensitive determination of hydrogen peroxide was established and then applied to the detection of hydrogen peroxide in water samples.
研究领域:
分析化学
·
纳米材料
·
电分析化学
·
生物传感器
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Fucheng Tang,Chunchuan Xu,Weifeng Yao
Hydrogen peroxide (H2O2) electrosynthesis via the two-electron oxygen reduction reaction (2e– ORR) is a promising alternative to the conventional anthraquinone process, but developing low-cost catalysts that simultaneously achieve high selectivity, productivity, and durability under alkaline conditions remains challenging. Herein, we report an EDTA-assisted coordination–annealing–selenization strategy for constructing NiSe2 nanoparticles confined in a porous N-doped carbon framework (NiSe2@N-C). In this design, EDTA-2Na serves as both a chelating ligand and a carbon/nitrogen source, enabling the formation of a conductive porous carbon scaffold that helps disperse NiSe2 nanoparticles and allows defect-related features to be tuned by annealing. In 0.1 M KOH, the optimized NiSe2@N-C catalyst achieves an H2O2 selectivity of up to 90% at 0.5 V vs RHE, an H2O2 production rate of 596 mmol g–1 h–1 at 0.3 V vs RHE, and a Faradaic efficiency of 85% at 0.3 V vs RHE. The catalyst also retains an H2O2 selectivity above 86% after 10,000 CV cycles under the tested conditions. Combined structural, electrochemical, and theoretical analyses suggest that annealing-governed defect-related features together with improved electrochemical accessibility contribute to the favorable 2e– ORR behavior. In addition, the relatively weak H2O2 reduction response may help suppress further peroxide loss under alkaline conditions. These results provide a useful basis for designing transition-metal selenide/carbon electrocatalysts for selective H2O2 electrosynthesis in alkaline media.
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高影响因子
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