TALANTA
·
2024
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IF 5.6
Kexin Ren,Mengxia Duan,Tingting Su,Dichen Ying,Shijia Wu,Zhouping Wang,Nuo Duan
Shiga toxin type II (Stx2), the major virulence component of enterohemorrhagic Escherichia coli , is strongly associated with the life-threatening hemolytic uremic syndrome thus posing a substantial risk to food safety and human health. In this work, a dual-mode aptasensor with colorimetric and surface-enhanced Raman scattering was developed for Stx2 specific detection based on noble metal nanoparticles and Raman reporter loaded metal-organic framework (Mn/Fe-MIL(53)@AuNSs-MBA). The Mn/Fe-MIL(53)@AuNSs could catalyze the H 2 O 2 -mediated oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB), thereby enabling visual detection. Meanwhile, the SERS signal from MBA can be enhanced by the decorated AuNSs. Under optimal conditions, a linear range of 0.05–500 ng/mL with limit of detection (LOD) of 26 pg/mL was achieved in colorimetric mode and a linear range of 5–1000 ng/mL with LOD of 0.82 ng/mL in SERS mode, in which the dual-mode results complement each other, widening the linear range, increasing the accuracy and reliability of the detection. The method was further applied to the detection of Stx2 in milk with average recovery of 101.1 %, demonstrating its superior potential for bacterial toxin monitoring.
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高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Xiangyu Ding,Qingbo Zhou,Ziye Wang,Lei Liu,Yusong Wang,Tinglu Song,Feng Wu,Hongcai Gao
Among the potential cathode materials for sodium-ion batteries (SIBs), sodium manganese hexacyanoferrate (NaMHCF) has attracted great interest because of its open 3D framework, cost-effectiveness, and high voltage properties. However, NaMHCF synthesized by the conventional coprecipitation method has the disadvantages of high crystal water and high defects. Herein, through an effective regulation strategy, the strong chelation between organic complex manganese salt and Na4Fe(CN)6 can greatly slow down the nucleation rate of the coprecipitation reaction and prepare low defect, low water content, high crystallization cubic phase NaMHCF. In situ XRD analysis shows that the cubic phase NaMHCF has no phase transformation during repeated charge and discharge, which greatly reduced the deterioration of the cathode caused by Jahn–Teller (J–T) distortion of Mn3+. Moreover, ex situ XPS and time-of-flight secondary ion mass spectrometry (TOF-SIMS) verified that the cubic phase NaMHCF crystal structure has low water content and lattice defects, and shows superior cycle stability with a capacity retention rate of about 90% at 350 mA g−1 over 300 cycles and impressive rate performance, and can still work normally even in low temperature environments (−20 °C). This work has great potential in the research of high-performance cathode materials for sodium-ion batteries.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Hao Meng,Yue Wang,Haiyan Yang,Jinglong Han,Dillirani Nagarajan,Shih-Hsin Ho,Jo-Shu Chang
Advanced oxidation processes, especially those engaging in persulfate activation, are one of the emerging technologies for the degradation of recalcitrant organic pollutants. This study used Fe and Mn-loaded Prussian blue analogs (FeMn-PBA) as precursors to synthesize a nitrogen-doped graphene shell (FeMn@NG) through calcination in a nitrogen atmosphere. This was then employed as a catalyst to initiate the degradation of sulfadiazine (SD) using persulfate. The encapsulated FeMn bimetallic nanoparticles with various oxidation states undergo redox cycling, which promotes the rapid generation of free radicals and maintains the stability of FeMn@NC by sustaining continuous persulfate (PDS) activation. The results showed that nearly 96 % of SD was degraded within 45 min. Experiments involving free radical quenching and electron paramagnetic resonance spectroscopy demonstrated that sulfate radicals (SO 4 ·− ) and superoxide radicals (O 2 ·− ) were primarily responsible for the degradation of SD. The impact of different process parameters on the degradation efficiency of SD was simultaneously investigated. The degradation products of SD were examined, and a degradation pathway was proposed according to the LC-MS findings. XPS analysis indicated the presence of Fe/Mn redox cycling, which played a role in the equilibrium electron transfer during PDS activation. This study provides insights into the rational design of efficient catalysts by combining Prussian blue analogs with FeMn, while also promoting the remediation of polluted water bodies.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Siyu Wu,Xiaojuan Niu,Jiali Chen,Wangni Meng,Han Tao,Jianli Zhou,Yuangen Wu
Kanamycin (KAN) can generate a serious threat to human health due to its tendency to accumulate in food. Current colorimetric strategy for KAN detection still faces some challenges, and nanozyme-based colorimetry is an ideal alternative approach. Herein, a non‑copper-based multivalent laccase mimic named Mn-Car is first synthesized through a self-assembly of manganese ions and the endogenous biomolecule carnosine, which is further used to develop a novel colorimetric method for ultrasensitive and selective detection of KAN. The laccase-like catalytic center is formed through the multidentate chelation bonds between manganese ions and imidazolium groups of histidine as well as carboxyl groups of β-alanine in carnosine. The multivalent oxidation states of manganese dynamically regulate electron transfer pathways through synergistic coordination. The unique Mn-Car architecture drives the efficient generation of superoxide radicals (O 2 · − ) and semiquinone radicals (SQ· − ). Leveraging the excellent laccase-like activity of Mn-Car , a highly sensitive colorimetric method for KAN detection is developed. Mn-Car forms polydentate chelation with the amino and hydroxyl groups in KAN, which can trigger multi-step cascade oxidation reactions that disrupt the structural core of Mn-Car and lead to reduced colorimetric signals. The colorimetric method achieves a limit of detection (LOD) of 0.102 μM and is successfully applied for on-site detection of KAN in water samples and honey, providing a novel platform for antibiotic residue analysis.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xiaoqiang Li,Xin Zhang,Xiaorui Zhang,Hao Lu,Jian Wang,Siyuan He,Xiaoxiao Duan,Yongsheng Ren
2-Mercaptobenzothiazole (MBT), a widely utilized metal corrosion inhibitor in industrial production processes, has become a typical persistent organic pollutant (POP) in the circulating water of coal chemical pipelines. In this study, Fe/Mn bimetallic MOF materials supported on carbon fiber paper (PC) were employed for the first time as an electro-Fenton cathode (Fe/Mn@MPC) in a heterogeneous electro-Fenton system, achieving efficient degradation of MBT. Specifically, this novel cathode enabled 96.35 % removal of MBT within 2 h. The uniformly rough fiber morphology presented by the Fe/Mn@MPC cathode results in an increased electrochemically active surface area and reduced resistance. Remarkably, it maintains a very stable catalytic activity over a wide pH range (3–11) and after 10 h of continuous operation, which confirms that the bimetallic synergistic effect enhances the stability of the system. EPR and quenching experiments identified hydroxyl radicals as the primary active species. Based on HPLC-MS results, MBT degradation pathways involving sulfur oxidation intermediate cleavage and benzothiazole ring detachment were proposed. This work presents a promising cathode design for the treatment of thiol-containing wastewater and offers new insights into the efficient remediation of coal chemical wastewater.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yaqi Wu,Jianhua Qian,Jinjuan Xing,Junhua Li,He Huang,Yanan Wang,Xueming Kang,Lijuan Wang,Jiasheng Xu
Volatile organic compounds (VOCs), as hazardous environmental pollutants emitted from chemical industries, cause significant threats to human health and ecological environment owing to their inherent toxicity and carcinogenicity. Catalytic oxidation has emerged as a promising technology for VOC elimination, enabling complete degradation of pollutants into CO 2 and H 2 O. This study investigates transition metal oxide (TMO x , TM = Mn, Co, Fe, Ni, Cu, Zn)/TiO 2 catalysts for toluene degradation. Since the catalytic efficacy of TiO 2 -based catalysts critically depends on the quantity of surface oxygen vacancy (O v ) in heterogeneous processes, we engineered O v -rich interfaces by breaking atomic periodicity arrangements and generating unsaturated coordination sites. These structural modifications enhanced oxygen migration rates and increased reactive oxygen species availability. Among the synthesized catalysts, CuO/TiO 2 exhibited the highest performance, achieving 90 % toluene conversion (T 90 ) at 286 °C under a weight hourly space velocity (WHSV) of 20,000 mL/(g·h) with an initial toluene concentration of 1000 ppm. The measurement of in-situ DRIFTS suggested that toluene oxidation process abided by the path of toluene → benzaldehyde → benzoic acid → anhydride →CO 2 and H 2 O. Furthermore, the by CuO/TiO 2 catalyst demonstrated great reusability, and long-term stability, highlighting its potential for industrial-scale VOC abatement applications.
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RSC Advances
·
2025
·Vol. 15
·期 28
·22605-22615
·
IF 4.6
Jujiao Zhao,Xianjuan Xu,Qiao Zhang,Feilan Qi,Haoxuan Wei,Quanfeng Wang,Youzhou He,Xiaoxia Bai,Shun Guan,Ming Zhu,Xingmin Wang
Transforming Mn residues into catalysts for activating peroxymonosulfate (PMS) for the degradation of organic pollutants is a promising method that could not only mitigate environmental pollution caused by Mn residues, but could also provide inexpensive catalysts for PMS-based wastewater treatment. Herein, a two-step method involving alkali-reduction treatment is proposed for improving the catalytic activity of Mn residues. The proposed alkali treatment successfully reduced the content of Si from 261.0 mg g−1 to 80.5 mg g−1, leading to relatively increased contents of Fe and Mn. Moreover, alkaline NaBH4 reduction treatment introduced more oxygen vacancies, further enhancing the performance. The sample treated with the two-step method exhibited rhodamine B (RhB) degradation kinetics of 0.034 min−1, which was 2.43 times higher than that of the control sample. Quenching experiments and electron paramagnetic resonance demonstrated the vital role of 1O2 in the degradation of RhB, and the mechanism was investigated. Furthermore, 18 types of degradation intermediates were detected, and the possible degradation pathway for RhB was proposed. Through employing a toxicity estimate software tool, it is indicated that RhB toxicity continuously decreases during RhB degradation. The findings of this work could shed light on the reutilization of Mn residues and the development of inexpensive catalysts for PMS-based wastewater treatment.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Qianqian Qiao,Zerui Liu,Fei Hu,Ziqiang Xu,Ying Kuang,Cao Li
Catalytic medicine, using enzymes or nanozymes, is an emerging method for cancer treatment. However, its applicability is limited by the low catalytic activity in the tumor microenvironment (TME). In this work, a versatile and synthesis-friendly nanozyme, CeO 2 Mn 1.08 O x nanoclusters, is prepared. This novel Ce─Mn heterojunction is formed by oxidation of CeO 2 nanoparticles through H 2 SO 4 /KMnO 4 . CeO 2 Mn 1.08 O x exhibits high multi-enzymatic catalytic activities and acts as a catalase (CAT), peroxidase (POD), and oxidase (OXD) mimics under acidic conditions. It can regulate the TME by relieving hypoxia and consuming endogenous glutathione (GSH). Glucose oxidase (GOx) is then incorporated into CeO 2 Mn 1.08 O x and linked with poly(ethylene glycol) (PEG) to obtain the cascade enzyme system (Ce─Mn)-PEI/GOx-PEG. CeO 2 Mn 1.08 O x exhibits CAT-like properties, which sensitize GOx-based starvation therapy, and POD- and OXD-like properties, which generate highly cytotoxic reactive oxygen species (ROS) in cancer cells. The glucose catabolic product, H 2 O 2 , is also used to generate O 2 and ROS. In addition, the heterojunction structure provides CeO 2 Mn 1.08 O x with near-infrared (NIR) photothermal capability, making it suitable for photothermal therapy (PTT). Density functional theory (DFT) calculations provide possible reasons for the high catalytic activity and photothermal capability of CeO 2 Mn 1.08 O x . When combining mild PTT with catalytic therapy, the cascade enzyme system (Ce─Mn)-PEI/GOx-PEG can efficiently ablate tumors.
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Advanced Sustainable Systems
·
2025
·
IF 6.1
Yu Ren,Youhao Zhang,Zizheng Zhou,Yi Fang,Yuzhuo Wang,Yingjie Li
Ca(OH) 2 can be used in CO 2 uptake from the flue gas in fossil-fired power plants. Compared with indirect method where Ca(OH) 2 is first converted into CaO and then uptakes CO 2 , direct CO 2 uptake by Ca(OH) 2 occurs at lower temperature, leading to slighter sintering. However, the direct CO 2 uptake capacity of Ca(OH) 2 should be further enhanced. In this study, Ca(OH) 2 is doped with Mn to improve its direct CO 2 uptake capacity in carbonation-calcination-hydration cycles. The cyclic tests are conducted in a triple fixed-bed reactor. The mechanism of CO 2 adsorbed on Mn-modified Ca(OH) 2 is determined by density functional theory calculations. In the first cycle, Mn-modified sorbents acquire highest carbonation conversion at 400 °C, which is 40 °C lower than Ca(OH) 2 . The modified Ca(OH) 2 with Ca/Mn molar ratio of 100:0.75 exhibits the best performance, and its carbonation conversions reach 0.76 and 0.59 in the 1st and 20th cycles, respectively, which are 28% and 18% higher than those of Ca(OH) 2 . Furthermore, carbonation conversion of this Mn-modified Ca(OH) 2 decreases by within 1.00% from cycle 5 to 20. Mn addition boots oxygen vacancy, increases the surface area and pore volume, and reduces the energy barrier for carbonation of Ca(OH) 2 . Mn-modified Ca(OH) 2 as CO 2 sorbent appears promising.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Suxing Xue,Huan Zhang,Huan He,Yachao Jin,Li Song,Mingdao Zhang
Due to the exceptional specific capacity, high energy density, and low cost, Li-rich manganese-based cathode materials (LRMCs) have emerged as promising candidates for next-generation lithium-ion batteries. However, their practical applications are hindered by relatively low initial Coulombic efficiency (ICE), continuous voltage fading during cycling, and poor capacity retention. In this study, Polyvinylpyrrolidone (PVP) and melamine are employed to treat the material surface, generating oxygen vacancies and forming a protective nitrogen-doped carbon layer. The presence of oxygen vacancies not only enhances Li + diffusion kinetics but also plays a critical role in suppressing voltage decay by activating stable cationic redox and minimizing irreversible oxygen release, which is key to the enhanced ICE. Additionally, the N-doped carbon coating establishes efficient electron conduction networks, facilitating efficient charge transfer. The modified materials exhibit an initial discharge capacity of 301.65 mAh g −1 at 0.1C (vs. 268.13 mAh g −1 for the pure Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNCO)), with an ICE of 87.88 % (pristine 77.46 %). After 200 cycles, the capacity retention reaches 85.17 % (compared to 45.16 % for the pure materials), and the voltage decay decreases from 0.72 V to 0.51 V. This study provides an important exploration for overcoming the challenges in the development of high-performance Li-rich manganese-based cathode materials.
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Analytical Methods
·
2025
·
IF 2.6
Chuntong Liu,Haiyan Qi,Jiayu Zhang,Jun Li,Tao Jing,Qiuying Li,Lixin Qiu,Xiaochen Zhu
The construction of a ratiometric fluorescent sensor based on nitrogen-doped carbon dots (NS-CDs) and fluorescein was reported to detect Mn(VII) and captopril. The detection mechanism of Mn(VII) and captopril were based on inner filter effect (IFE) and redox reaction, respectively. The sensor showed good linearities in the detection range of 0.12-100 μM for Mn(VII) and 0.52-300 μM for captopril, with limits of detection (LODs) of 0.12 μM and 0.52 μM, respectively. Furthermore, a smartphone-based platform for the detection of Mn(VII) and captopril was developed, based on the dual-signal response of color and fluorescence intensity. The system displayed linear signal changes with increasing Mn(VII) and captopril concentration in the ranges of 0.32-100 μM and 0.52-300 μM, with LODs of 0.32 μM and 0.52 μM, respectively. Finally, the ratiometric sensor was validated for the determination of Mn(VII) and captopril in herb and captopril tablet samples, demonstrating its broad applicability and versatility as a portable, sensitive, and specific detector for Mn(VII) and captopril in various sample types. Overall, our ratiometric fluorescent sensor has potential as a portable, on-site detector for Mn(VII) and captopril analysis.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 10
·2675-2683
·
IF 3.431
Gao Ni,Ling Bo,Gao Zhongling,Wang Lun,Chen Hongqi
An electrochemiluminescence resonance energy transfer (ECL-RET) system that detects prostate-specific antigen (PSA) was created. Near-infrared (NIR)-emitting NaYF 4 :Yb,Tm/Mn upconverting nanoparticles (UCNPs) are used as donors, and gold nanorods (GNRs) are used as acceptors. The ECL was enhanced nearly threefold by Mn 2+ doping, with an emission peak appearing at an NIR wavelength of 808 nm. Anti-PSA 1 (Ab 1 ) was bound to the surfaces of UCNPs after being modified with poly(acrylic acid) (PAA). As for acceptors, cetyltrimethylammonium bromide (CTAB)-capped GNRs were treated with 11-mercaptoundecanoic acid (MUDA) and then conjugated with Anti-PSA 2 (Ab 2 ). When PSA was added, donors and acceptors were brought in close proximity through specific interactions of antibodies and antigens, resulting in high quenching efficiency levels. Under optimal conditions, the linear range of detection was 3.75–938 pg/mL for PSA ( R = 0.999), with a detection limit as low as 3.16 pg/mL. This method can be applied to detect PSA in human serums with satisfactory results.
An electrochemiluminescence resonance energy transfer system was developed for determination of prostate-specific antigen using near-infrared-emitting NaYF 4 :Yb,Tm/Mn upconverting nanoparticles as donors and gold nanorods as acceptors.
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