MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jie Cao,Jingge Niu,Yizhuo Pang,Tianshu Luo,Jiayi Peng,Xiaohong Hou
Nitrite is a kind of frequently detected inorganic pollutants in water. In order to sensitively and conveniently monitor the nitrite anytime and anywhere, colorimetric sensing method-based nanoenzymes and portably immediate detection devices become urgent. Herein, we utilized L-arginine as a catalyst and a linker to mediate the synthesis of CeO 2 on bimetallic MOFs (CeO 2 @Mn/ZIF-67), with Co and Mn were set as the central metals. Its enzyme-activated performance ( K m : 0.054 mM and V max : 64.00 μMs −1 ) was superior to most reported materials. Nitrite can diazotize with oxTMB, causing a change in the ratio of absorbance at 652 nm to absorbance at 450 nm (A 652 /A 450 ). Thus, a rapid and sensitive platform for the colourimetric detection of nitrite was established. A portable glass tube hydrogel sensor was designed inspired by the principle of disposable alcohol swabs for the first time to achieve the nitrite monitoring. When the glass tube was cut to introduce TMB and nitrite into the nanoenzymes, a noticeable colour change occurred. Attributed to the high activity of the nanoenzymes and the clever design of the detection device, the proposed method overcame the shortcomings of the traditional sensing methods such as long detection time and poor portability.
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高影响因子
LANGMUIR
·
2023
·
IF 3.9
Feng Chen,Weilong Dai,Xinqi Zhu,Congcong Yao,Junchao Qian,Zhigang Chen,Cheng-bao Liu
Mn-based cathode material Li1.20Mn0.52Ni0.20Co0.08O2 was proposed and ameliorated by surface-coating poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and doping Ga3+. X-ray diffraction and high-resolution transmission electron microscopy studies revealed that part of Ga3+ replacing the Ni site could reduce the Li+/Ni2+ mixing by forming a well-ordered layered structure and a homogeneous coating layer of PEDOT:PSS is covered on the surface of Li1.20Mn0.52Ni0.19Co0.08Ga0.01O2. The results of the electrochemical studies demonstrated the higher initial charging–discharging Coulombic efficiency, and outstanding rate capabilities and cyclic performance were obtained for the PEDOT:PSS-covered and Ga3+-doped samples. Especially, 2 wt % PEDOT:PSS-coated Li1.20Mn0.52Ni0.19Co0.08Ga0.01O2 delivered 38.3 mAh g–1, which is larger than the pristine cathode at a 5C high rate. Meanwhile, it could retain 189.6 mAh g–1 (90.3% of its initial discharge capacity at 45 °C) after 300 cycles with a 1C rate, while the pristine cathode only delivered 149.7 mAh g–1 with 80.7% cycling retention left. The results strongly suggested that such PEDOT:PSS-coated and Ga3+-doped Mn-based layered structure materials demonstrated high potential as a cathode candidate especially for high-energy applications.
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高影响因子
Food Analytical Methods
·
2026
·Vol. 19
·期 10
·295
·
IF 3
Su Kaiyue,Peng Xinli,Zheng Yuze,Qiao Xuguang,Waterhouse Geoffrey I.N.,Xu Zhixiang
In this paper, a molecularly imprinted polymer with good benzopyrene adsorption performance and a PDA@Mn-ZIF-8 nanozyme with high catalytic activity were synthesized. The molecularly imprinted polymer was used as the biomimetic antibody, while the PDA@Mn-ZIF-8 was used as the marker. A novel direct competitive biomimetic enzyme-linked immunosorbent assay (BELISA) method was established for the sensitive detection of benzopyrene. Under the optimal conditions, the detection limit (LOD and IC 15 ) and sensitivity (IC 50 ) of the BELISA method for benzopyrene were 0.52 µg L −1 and 65.64 µg L −1 , respectively. This method was successfully used to detect benzopyrene in chicken and pork samples, with recovery rates ranging from 89.12 to 105.26% for chicken and 92.83 to 112.31% for pork. The contents of benzopyrene in sausages and grilled lamb samples were determined by BELISA and HPLC, and no significant differences found between the results of the two methods. This work offers a new, rapid, and accurate method for the detection of benzopyrene in foods.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 20
·9528-9538
·
IF 9.931
Yali Weng,Zhenzhang Weng,Zhiyu Liang,Haixia Lyu,Zanyong Zhuang,Yan Yu
Intricate Fenton-like catalysts composed of mixed transition metal oxides (TMOs) frequently outperform simple TMOs in scavenging organic contaminants in wastewater. Nonetheless, their activity and/or reusability may sharply decline when abundant heavy metal ions in wastewater adsorb on the catalytic surface and passivate it. This study shows that mesoporous Ca–Mn mixed oxides prepared from a facile combination of Mn and an alkaline earth metal (i.e., Ca) (denoted as CaMnx) can readily overcome this problem. CaMnx without any additive (e.g., H2O2) was able to degrade organic contaminants (e.g., indigo carmine as a model contaminant) fast within 10 seconds, outperforming many other reported heterogeneous Fenton catalysts. Besides organics, the coexisting heavy metal ions (e.g., Cu2+ and Pb2+ as indicators) were also rapidly extracted. The outstanding performance was attributed to the synergy of Ca and Mn. CaO in CaMnx efficiently extracted metal ions via an ion exchange process, and MnOx generated abundant H2O2 and degraded the organics through an uncommon Fenton-like reaction. Therein, Cu species extracted by CaO catalyzed the decomposition of H2O2 into HO˙ radicals, speeding up the degradation reaction of the organics by 81 times. Benefiting from the gradual exposure of fresh Mn-sites protected by unreacted CaO, CaMnx without regeneration treatment maintained high efficiency in scavenging organics and heavy metal ions in cycling tests. CaMnx also showed great promise in treating complex water samples containing various heavy metal ions (e.g., Pb2+, Cu2+, Cd2+, Ag+, Zn2+ and Cr3+) and organic pollutants. The findings of this work enrich the rational design of related functional nanomaterials.
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高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000684
·
IF 4.948
Wenyan Chen,Donghui Xu,Yuancheng Chen,Tang Tang,Shaojie Kuang,Haikuo Fu,Wuyi Zhou,Xiaoyuan Yu
Using polyvinyl alcohol and N-rich polyacrylonitrile as carbon sources, uniform MFe 1– x Mn x PO 4 (M = Li, Na)/N-doped C nanofibers are synthesized by sol–gel pretreatment and an electrospinning method followed by calcination. The as-prepared nanofibers exhibit a 3D homogenous network with uniform distribution of MFe 1− x Mn x PO 4 nanoparticles. The lattice distorts after Mn-doping without altering the original crystalline structure, increasing conductivity and enhancing the efficiency of Li + /Na + diffusion. When applied for lithium ion batteries, the optimized LiFe 0.8 Mn 0.2 PO 4 /C nanofibers deliver a considerable initial capacity of 169.9 mAh g −1 with coulombic efficiency of 92.4%. It also displays the excellent cycling stability with reversible capacity of 160 mAh g −1 after 200 cycles at 0.1 C and high rate performances with the specific capacity of 93 mAh g −1 at 5 C. Furthermore, NaFe x Mn 1− x PO 4 /N-doped C nanofibers are also synthesized by the same method for sodium-ion batteries, which exhibit an initial capacity of 134 mAh g −1 and specific capacity of 106 mAh g −1 at 0.1 C and 90 mAh g −1 at 1 C after 200 cycles. Owing to the facile fabrication process, these nanofibers are promising cathodes for lithium/sodium ion batteries with excellent electrochemical performances.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 36
·28762-28768
·
IF 3.84
Yuan Su,Xiaoyu Mu,Li Qi
L-Alanine (L-Ala) derived amino acid ionic liquids (AAILs) were synthesized successfully and applied as new chiral ligands in a chiral ligand exchange capillary electrophoresis (CLE-CE) system. With Mn(II)–AAIL complexes and β-cyclodextrin (β-CD) as the dual chiral selectors, a CLE-CE system was further developed for enantioseparation of dansyl D,L-amino acids (Dns-D,L-AAs). The influence of different separation parameters in CLE-CE, including the different kinds of AAILs, pH of the running buffer, the ratio of Mn(II) to AAILs, the concentration of complexes and β-CD were investigated and the optimum buffer was obtained: 100.0 mM boric acid, 5.0 mM ammonium acetate, 2.5 mM Mn(II), 5.0 mM [1-butyl-3-methylimidazolium][L-Ala] and 5.0 mM β-CD at pH 8.3. Under the optimum conditions, twelve pairs of Dns-D,L-AAs could be baseline separated and six pairs were partly separated. Additionally, a control study between the performance of Mn(II)–L-Ala and Mn(II)–[1-butyl-3-methylimidazolium][L-Ala] complexes was conducted to prove the unique behavior of AAILs in CLE-CE. Moreover, the proposed CLE-CE method was applied in screening tyrosinase inhibitors with benzoic acid and its derivatives as the typical compounds. The results illustrated that the CDs acting synergistically with the CLE-CE system could produce better performance on enantioseparation, and the novel CLE-CE method has great application potential in enzyme analysis.
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高影响因子
FIRE SAFETY JOURNAL
·
2025
·
IF 3.3
Haoran Jiang,Yong Hu,Yong Jiang,Rong Qiu,Hui Huang
Due to the increased risk of phosphate depletion, there is an increasing demand for low-phosphorus or bio-based phosphorus flame inhibitors. Therefore, two novel composites with biologically-based phosphorus sources that chelate transition metal ions were synthesized via assembly method, i.e., Mn-PMC and Ni-PMC, the structure and binding states of the composites were examined by SEM, TEM, FTIR, XRD, XPS, BET and TGA. The results indicated that Mn-PMC and Ni-PMC (ⅰ) are nanoscale materials with well dispersed, (ⅱ) have an amorphous structure and have sites that bind to other substances, (ⅲ) contain no halogen elements. Then the combustion inhibition experiments of downward flame spread and TG-IR-MS analysis revealed (ⅰ) that the inhibition efficiency of the two prepared inhibitors was higher than that of commercial phosphate-containing inhibitor ADP. Among them, Ni-PMC had the best suppression effect, and the flame of cellulose sample containing it would automatically extinguish after igniting with a smallest dosage, (ⅱ) two inhibitors reduced the laminar flame velocity and flame temperature. (ⅲ) their flame suppression mechanism was indicated as that the pyrolysis releases inert gas to dilute the free radical concentration. This work is helpful for the development of efficient transition metal fire extinguishing agents to replace traditional phosphorus resources.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
S. Jafari,A.R. Faraji,A. Gil,F. Ashouri
Valorizing single-use plastic waste as an effective activator in environmental protection has gained great interest from policymakers, legislators, and scientific research communities. Herein, low-cost and highly porous alkali Fe/Mn-doped carbon nanomaterials derived from polyethylene terephthalate (PET) waste (MF/ c PET- x ) were fabricated via facile pyrolysis and alkali-metal impregnation methods. Detailed characterizations of MF- c PET- x demonstrated that the ratio of alkaline impregnation and pyrolysis temperature affects the porous characteristics, content, and size of active sites, specific surface area, and yield of carbon residue/nanocomposite. The main aim of this study was to evaluate and optimize the MF/ c PET- x applied for the detoxification of various kinds of pharmaceutical drugs ( tetracycline , naproxen , paracetamol , and levofloxacin ) and various dyestuff in their single, binary, ternary, and quaternary solutions. The magnetic porous MF/ c PET-1 was found to show a most effective PMS activation for single/multiple toxic pollutants removal attaining levels >91.0 % in a wide range of temperatures (5–35 °C) and pH (3.0–9.0), without significant detectable metal leaching (>0.16 mg L −1 ). The outstanding catalytic performance in complex water environments was mainly attributed to the deposition of Mn/Fe nanoparticles with small grain size on a polymeric scaffold, bimetal synergistic effect, high specific surface area, high stability, and excellent anti-interference capability against coexisting substances. Physicochemical properties of the recycled composite, masking, and EPR analyses confirmed that the dominant reactive species in the following order: 1 O 2 > OH > SO 4 − > O 2 − . This work offers a new and straightforward approach for preparing porous alloy composite from plastic waste for pollutant degradation in various water matrices.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Jun Lu,Zhipan Wen,Yalei Zhang,Gang Cheng,Rui Xu,Xiaohu Gong,Xin Wang,Rong Chen
A series of ordered mesoporous Fe Mn bimetal oxides (OMFMs) were fabricated by using a novel inverse micelle method, and the texture, nanostructure and interface chemistry properties of OMFMs were closely correlated to the calcination temperature. Due to the amorphous regular inner-connected nanostructure and bimetallic synergistic effect, the obtained OMFMs exhibited superior arsenic sequestration performance than pure mesoporous Fe oxides (PMF) and Mn oxides (PMM). The optimum ratio of Fe/Mn and calcination temperature for arsenic removal was 3/1 and 350 °C (OMFM-3), and the maximum As(III) and As(V) adsorption capacities of OMFM-3 were 174.59 and 134.58 mg/g, respectively. Solution pH value negligibly affected the uptake of arsenic (ranged from 3.0 to 7.0), while SiO 3 2− /PO 4 3− ions and humic acid (HA) displayed significant inhibitory effect on arsenic removal by OMFM-3. According to the mechanism of arsenic removal, which simultaneously analyzed the arsenic redox transformation in aqueous phase and on solid phase interface, it was concluded that manganese oxides in OMFM-3 mainly played the role as a remarkable As(III) oxidant in water, whereas iron oxides dominantly acted as an excellent arsenic species adsorbent. Finally, the prominent arsenic sequestration behavior and performance in surface water suggested that OMFM-3 could be a promising and hopeful candidate for arsenic-contaminated (especially As(III)) surface water and groundwater remediation and treatment.
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PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Huang-gen Yang,Mang Lu,Xue-jiao Wu,Rui-ting Dong,Tao-peng Luo,Hui-hua Zhong
Persulfate non-radical oxidation have excellent catalytic capability for degrading specific contaminants in complicated water environments. Nevertheless, the preparation of high-performance activators and their application in actual water treatment in continuous flow mode are still scarce and unsatisfactory. In this work, copper-, manganese-, and copper/manganese-doped ceramsites (Cu–C, Mn–C and Cu/Mn–C), successfully fabricated through a facile impregnation-calcination approach, were characterized and evaluated for their performance to activate potassium peroxydisulfate (PDS) and degrade oxytetracycline (OTC) under different pH, ceramsite dosages, and PDS dosages. Compared with Cu–C and Mn–C, Cu/Mn–C showed the highest OTC degradation rate (0.0264 min −1 ) via activating PDS with an OTC removal efficiency of 98.2% in 240 min at an initial OTC concentration of 40 mg/L. The removal efficiency of OTC by Cu/Mn–C only decreased to 92.8% after 5 cycles; the activating ability of the used Cu/Mn–C was almost completely recovered through 2 h of calcination at 500 °C. The results of electron paramagnetic resonance and radical quenching suggest that singlet oxygen ( 1 O 2 ) was unveiled to be the dominant reactive oxygen species (ROS) for contaminant degradation, originating from the regrouping of superoxide ions or reduction of active Cu/Mn sites. Synergies between Cu and Mn species to enhance ROS yield were the primary activating mechanisms. Six possible routes of OTC decomposition were inferred. Additionally, Cu/Mn–C behaved excellently in treating an actual wastewater using a continuous flow fixed-bed reactor. It is believed that this novel Cu/Mn–C/PDS system may create a fresh path to design effective and cheap metal-ceramsite hybrid activators for degrading recalcitrant contaminants in the actual application process.
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PubMed
高影响因子
Chem & Bio Engineering
·
2026
·Vol. 3
·期 4
·470-477
·
IF 8.4
Shao Y,Hao S,Liu F,Kong Y,Ji H,Xie Z,Liao Y,Liu W,Huang Y,Yuan L.
The widespread deployment of lithium-ion batteries (LIBs) is driving a steep rise in end-of-life batteries, heightening resource and environmental burdens and underscoring the need for efficient recycling. Direct regeneration, with its simplified processing, offers a practical alternative to conventional pyrometallurgical and hydrometallurgical routes. Herein, we directly regenerate spent polycrystalline LiNi 0.8 Co 0.1 Mn 0.1 O 2 (S-NCM811) into single-crystal cathodes with uniformly distributed Ce through mechanical deagglomeration-assisted eutectic molten salt regeneration. Lithium is replenished through fast ionic transport in the molten salt, while the surface NiO rock salt phase is relithiated and reconstructed into the layered structure. Notably, Ce doping expands the interlayer spacing and enhances the structural stability of regenerated LiNi 0.8 Co 0.1 Mn 0.1 O 2 (R-NCM811). In situ X-ray diffraction and electrochemical impedance spectroscopy confirm that Ce-doped single-crystal R-NCM811 alleviates H2→H3 lattice distortion and maintains lower charge-transfer resistance. As a result, R-NCM811 exhibits improved electrochemical performance, delivering 159.5 mAh g -1 at 5 C and retaining 88.17% of its capacity after 300 cycles at 1 C. This work establishes a viable upcycling strategy for regenerating single-crystal cathodes and provides a practical pathway toward more sustainable battery recycling.
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PubMed
高影响因子
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