JOURNAL OF FLUORESCENCE
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2025
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IF 3.1
Yao Jie,Chen Hongfang,Yang Xiaohua,Iqbal Muzaffar,Bian Wei
Mercury ions (Hg 2+ ) are categorized as environmental pollutants, which distributed in water, soil, and food systems due to environmental contamination. Hence, designing a sensitive assay for the convenient determination of Hg 2+ is of great importance. Herein, S and O-doped graphite phase nitrogenized carbon quantum dots (S, O-C 3 N 4 QDs) was encapsulated within a europium -based metal-organic framework (Eu-MOF) to construct a novel ratiometric fluorescent nanoprobe for the quantitative detection of Hg 2+ . The native emission of S, O-C 3 N 4 QDs at 445 nm is used as a response signal, while Eu-MOF with fluorescence offers a reference signal at 619 nm. Hg 2+ exhibits high affinity for the surface functional groups of S/O-C 3 N 4 QDs, forming non-fluorescent chelation complexes that induce static quenching. This results in significant attenuation of the fluorescence intensity at 445 nm, while the emission at 619 nm remains invariant. A ratiometric fluorescence sensing platform was established based on the intensity ratio (F 445 /F 619 ) for the selective detection of Hg 2+ . The linear range of S, O-C 3 N 4 QDs/Eu-MOF of Hg 2+ was 0.25–35 µM and with a detection limit of 4.3 nM. The satisfying results demonstrate the effectiveness of the developed S, O-C 3 N 4 QDs/Eu-MOF-based fluorescence probe for Hg 2+ detection, highlighting its promising potential for environmental monitoring applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xi Chen,Xiaoyan Wang,Ziliang Jia,Chao Yang,Zhihong Liu,Yuexing Wei,Mengxue Wang,Meisheng Liang
K-doped Mn–Ce solid solution catalysts were synthesized using a combination of coprecipitation and hydrothermal methods, demonstrating excellent performance in benzene oxidation. The catalyst K 1 Ce 5 Mn 5 exhibited comparable activity to noble metal catalysts, achieving a 90 % benzene conversion at approximately 194 ℃. Durable tests under dry and moist conditions revealed that the catalyst could maintain its activity for 50 h at 218 ℃ and 236 ℃, respectively. Characterization results indicated that the catalyst’s enhanced activity resulted from the weakened Mn–O bonding caused by the introduction of K + , facilitating the activation of oxygen and its involvement in the reaction. CeO x , the main crystalline phase of Mn–Ce solid solutions, provided abundant oxygen vacancies for capturing and activating oxygen molecules for the weakened Mn–O structures. This conclusion was further supported by partial density of state analysis from density functional theory computations, revealing that the introduction of K + weakened the orbital hybridization of Mn3d and O2p. Finally, in situ diffuse reflectance infrared Fourier-transform spectroscopy ( in situ DRIFTS) studies on Ce 5 Mn 5 and K 1 Ce 5 Mn 5 catalysts suggested that the introduction of K + promoted the conversion of adsorbed benzene. Furthermore, intermediate products were transformed more rapidly for K 1 Ce 5 Mn 5 compared to Ce 5 Mn 5 .
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Journal of the American Chemical Society
·
2025
·
IF 15.6
Mingyan Chuai,Hao Tong,Zimin Yang,Siting Deng,Mingqiang Wu,Jidan Xing,Guoliang Chai
An electrolytic Zn–MnO2 battery is highly valued due to its cost-effectiveness, environmental friendliness, and abundant resource availability. However, the battery’s performance is hindered by the slow kinetics at the poorly conductive MnO2 cathode and hydrogen evolution at the Zn anode. Here, a strategy of P–O–M (M = Mn, Zn) d-pπ backbonding design is proposed for phosphorus–oxygen electrolyte additives, which can be realized by tuning the atomic dipole moment-corrected Hirshfeld (ADCH) population charge of the P/O atom. The reversibility of d-pπ backbonding not only leads to the fast kinetics of Mn2+/Zn2+ at electrodes during both charge and discharge processes to suppress the competitive hydrogen evolution reaction but also enhances the electronic conductivity at the electrode–electrolyte interfaces to sustain the high areal capacity of batteries. Hydroxymethyl dimethyl phosphite (HPD) with d-pπ backbonding is a preferred additive with a suitable ADCH charge. The assembled electrolytic Zn–MnO2 (HPD) battery exhibits a high discharge capacity of 14.05 mAh cm–2 at an areal capacity of 15 mAh cm–2 and superior cycling stability over 1500 cycles. The Zn–MnO2 (HPD) soft-pack battery exhibits a discharge capacity of over 1.60 Ah at a discharge rate of 0.5 C and maintains a Coulombic efficiency of ∼80% over 100 cycles. Furthermore, the assembled 50 V 40 Ah commercial Zn–MnO2 (HPD) battery can drive an electric vehicle for 10 km. The ADCH charge regulation provides a feasible and effective method for developing high-performance aqueous batteries by achieving d-pπ backbonding.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huizhen Sun,Xiuhua Chen,Zongdeng Wu,Wenhui Ma,Shaoyuan Li,Chen Li,Dandan Wu,Kaixin Fu,Kexiang Ding
Lead ions (Pb(II)) in industrial wastewater pose a serious threat to the ecological environment and human health due to their toxicity and persistence. Traditional treatment methods often struggle to achieve both efficient capture and sensitive detection of Pb(II). In this study, a novel bifunctional covalent organic framework (BTT-DHBD-COF) with ortho N-S/N-O dual sites was innovatively designed to enable highly selective adsorption and ultrasensitive detection of Pb(II). Adsorption studies revealed that the BTT-DHBD-COF exhibits a high adsorption capacity for Pb(II) (570.7 mg/g at pH 5) and rapid kinetics (equilibrium reached in 10 min). The BTT-DHBD-COF/GCE sensor demonstrated a wide linear detection range (0.0001–0.5 μM) and an ultralow detection limit (0.03 nM). In real water samples (lake water and tap water), it achieved high recovery rates of 96–108 % with relative standard deviations (RSDs) of 2.5–3.45 %. Experimental results and theoretical calculations confirmed that the N-S/N-O dual sites significantly enhance Pb(II) capture and detection through strong coordination (with Pb transferring 0.46 and 0.44 electrons to the N-S and N-O sites, respectively) and efficient electron conduction via the π-conjugated framework. Compared to single binding sites (S: 0.42 e, O: 0.40 e, N: 0.37 e), the significant charge transfer of the dual site highlights its key role. This work presents an innovative bifunctional “adsorption-detection” strategy for the remediation of Pb(II) pollution in industrial wastewater.
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CARBON
·
2025
·
IF 11.6
Sabarinathan Ravichandran,Angappan Kausalya,Xinru Ji,Senthilkumar Lakshmipathi,Huaneng Su,Daifen Chen,Jie Yu
Defect engineering coupled with heteroatom-induced electronic modulation is crucial for developing highly active metal-free carbon electrocatalysts for anion exchange membrane fuel cells (AEMFCs). However, precisely identifying active configurations in dual-heteroatom-doped carbon and controlling the ORR pathway remains challenging. Herein, we present a lignin-based supermolecule-regulated pyrolysis strategy for synthesizing N, O co-doped porous carbon (LNOC) with a large surface area of 549.7 m 2 g −1 and a hierarchical porous structure. The optimized LNOC-900 catalyst demonstrates excellent ORR activity, featuring a half-wave potential (E 1/2 ) of 0.86 V vs. RHE and a high kinetic current density (j k ) of 83.29 mA cm −2 at 0.85 V, surpassing the benchmark commercial Pt/C electrocatalyst. When employed as the cathode in AEMFCs, LNOC-900 achieves a maximum peak power density (1.05 W cm −2 ) and current density (3.30 A cm −2 ) at 0.8 V. Density functional theory (DFT) reveals that N/O co-doping and defect engineering synergistically optimize ORR intermediate adsorption, with pyridinic-N embedded in a defective sp 2 carbon matrix, facilitating O–O bond cleavage via charge density modulation at defect sites. This work presents a sustainable, low-cost path to next-generation energy storage and conversion devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Pengyao Guo,Yuan Qin,Yujie Fang,Lei Ding
This study presents the rational design of a magnetically recoverable CoFe 2 O 4 /BiVO 4 @g-C 3 N 4 (CFO/BVO@CN) ternary heterojunction for highly efficient levofloxacin (LVFX) degradation via peroxymonosulfate (PMS) activation under visible light. The key innovation lies in the synergistic integration of a unique charge transfer pathway with interfacial M-N (M = Co, Fe, Bi, V) chemical bonding, as unequivocally evidenced by XPS. This atomic-level interfacial engineering creates efficient electron channels that not only promote the spatial separation of photogenerated carriers but also dramatically accelerate the dual redox cycles of metal species (Co 2+ /Co 3+ , Fe 2+ /Fe 3+ ).Crucially, the V 4+ /V 5+ pair functions as an efficient electron shuttle, facilitating the rapid regeneration of PMS-active Co 2+ and Fe 2+ sites and sustaining a high-efficiency catalytic process. Consequently, the optimized system achieves an exceptional LVFX removal rate of 98.8% within 30 min, driven predominantly by singlet oxygen ( 1 O₂) and superoxide radicals ( • O 2 − ). The catalyst demonstrates robust stability over multiple cycles, facile magnetic separation, and effective detoxification of LVFX. This work provides a novel paradigm for developing multifunctional photocatalytic systems by marrying heterojunction engineering with atomic-level interface modulation for sustainable water purification.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Hanguang Wang,Xiaoxue He,Shiyuan Tong,Xinyue Dai,Qiqi Wu,Jiayu Hu,Chao Dong,Jingjing Wang,Chengxin Lei,Juhua Feng,Wei Li,Li Zhang,Qianming Huang,Xiang Pu
Rhynchophylline (RIN) and isorhynchophylline (IRN) have been evaluated as the pivotal medicinal ingredients in Uncaria rhynchophylla. They display excellent antihypertensive and neuroprotective effects. But in U. rhynchophylla , the gene elements responsible for the biosynthesis of secologanin, a critical precursor for RIN and IRN, remain unidentified. In this study, one UrLAMT gene and three UrCYP72A genes ( UrCYP72A1177 , UrCYP72A1178 , and UrCYP72A1179 ) are mined and cloned from U. rhynchophylla . Biochemical verification reveals that UrLAMT exhibits C11-carboxy O -methyltransferase activity for loganic acid and UrCYP72A1177–UrCYP72A1179 display C7-C8 bond scission activity for loganin. Evolutionary origin analyses imply that the genes responsible for iridoid biosynthesis cluster in adjacent region in O. pumila and L. japonica , but UrLAMT and UrCYP72A1178 – UrCYP72A1179 distribute scatteredly in U. rhynchophylla . Kinetic parameter analyses reveal that UrCYP72A-catalyzed C7-C8 scission is a rate-limiting step. The enzymatic activities of UrCYP72A1177–UrCYP72A1179 are significantly improved by D396E, F327G + P393V, and L321G + V390I mutation, respectively. Two-step biosynthesis of secologanin is facilitated by co-expression of UrLAMT and UrCYP72As in tobacco. The highest secologanin yield (3.35 μg g −1 ) in tobacco is achieved in UrLAMT and UrCYP72A1177-D396E co-expression group. This study newly uncovers two adjacent biosynthetic steps for secologanin in a RIN-producing plant, proposes a plausible mechanism for UrCYP72A-mediated C C bond cleavage, and boosts the secologanin yield in tobacco. These findings would accelerate the schedule of RIN biomanufacture.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuangjiang He,Junchang Wang,Chong Wang,Xiao Zhang,Sen Liang
The Mn-Fe-Co-Zn-O series is a widely used thermistor material, but its thermal stability is compromised by nitrogen glass encapsulation, limiting its application in electrical devices. To address this issue, La 2 O 3 and Y 2 O 3 were used as rare earth oxide dopants, and xR 2 O 3 -Mn 0.76 Fe 0.87 Co 1.07 Zn 0.3 O 4 (x = 0.0025, 0.005, 0.01, 0.02) negative temperature coefficient (NTC) materials were synthesized via solid-state sintering. The effect of rare earth doping on the electrical properties after high-temperature nitrogen annealing was investigated. After annealing at 750°C for 4 h, the variation in resistivity ( ρ 25 ) and material constant ( B 25/50 ) significantly decreases with increasing La doping. For the La-doped sample (x = 0.01), Δρ 25 decreased to 7.77% and ΔB 25/50 to 0.77% (for the Y-doped sample (x = 0.01), Δρ 25 decreased to 22.76% and ΔB 25/50 to 1.91%), compared to the undoped sample, where Δρ 25 reduced by 168.84% and ΔB 25/5 0 by 5.57%. This improvement was attributed to rare earth accumulation at grain boundaries, filling voids and forming R-O bonds, which inhibited oxygen vacancy migration and significantly reduced grain boundary resistance. Rare earth doping effectively improved the thermal stability and electrical consistency of NTC thermistor ceramics in high-temperature nitrogen atmospheres, offering a new strategy for high-temperature encapsulation applications. (Y-doped samples showed similar results, as detailed in the Supplementary Materials.)
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Nano Energy
·
2025
·
IF 17.1
Zhao Sun,Huicai Wang,Xingxu Wang,Riguang Zhang,Zhiqiang Sun
Sorption-enhanced steam reforming of methanol (SE-SRM) offers a promising route for high-quality hydrogen production with in situ CO 2 capture; however, achieving an optimal balance between catalytic activity and CO 2 uptake capability, while ensuring catalyst stability, remains a significant challenge. In this study, a series of Zr-doped (0 wt%, 5 wt%, 15 wt%, 25 wt%) Cu-MgO catalytic sorbents are synthesized for SE-SRM. At 180℃, the hydrogen concentration and yield reach nearly 100 % and 10.35 μmol·g −1 ·s −1 . Moreover, the catalytic sorbent basically retains its catalytic activity and CO 2 uptake capacity after 30 cycles with merely slight deactivation. Results demonstrate that the doped Zr, presents as tetragonal ZrO 2 , enhances metal-support interactions with the formation of a Cu-O-Zr interfacial structure, promoting Cu nanocluster dispersion and altering the Cu + /Cu 0 distributions. Zr doping also enables the modulation of the medium-strong basic sites. Moreover, the AFM and TEM confirmed the formation of high-roughness MgO surface on the substrate, thereby facilitating CO 2 diffusion and adsorption. DFT calculation results further confirm the advantages of Zr-doped Cu-MgO catalytic sorbents due to its stronger capability on CH 3 OH activation and CO 2 adsorption.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Wenjing Kong,Xueyun Zhong,Ying Yan,Yun Xing,Lei Liu,Chuan Yu,Leneng Yang,Xiaofei Song,Mingli Fu
With the widespread use of waterborne coatings, the treatment of volatile organic compounds (VOCs), which is also easy to produce odor pollution, has become the major concern of the air pollution control in coating industry. Since the deep oxidation of the butyl acetate (BA) molecule requires the involvement of a large amount of reactive oxygen species, the catalytic oxidation of BA was promoted by weakening the Co-O bond strength on the cobalt oxide surface. In this study, we adopted a simple sacrificial template approach to fabricate a series of specifically shaped and uniform Co3O4 catalysts for the catalytic oxidation of BA. The flake CM71-C catalyst showed the most excellent catalytic properties of BA (T50 = 197 °C, T90 = 215 °C). According to the characterization results, flake CM71-C has the largest specific surface area and the weakest Co-O bond, which is more conducive to redox and oxygen activation capabilities of catalyst. The results of In-situ DRIFTS studies showed that the surface reactive oxygen species were continuously recharged during the reaction due to the higher oxygen activation capacity, which accelerated the rapid decomposition of carboxylate, a key reactive intermediate species in the deep oxidation of BA. This study provides a practical and effective way to gain insight into the role of oxygen vacancies in the preparation of efficient catalysts with specific morphology for VOCs oxidation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shihai Cao,Xiang Ma,Yuxin Yang,Yao Lu,Aiwu Sun
The combination of photocatalytic technology and advanced oxidation technology is a promising strategy for degrading recalcitrant antibiotic contaminants. In this study, a novel hybrid Photocatalysis-Self-Fenton (PSF) system that combines photocatalysis with the Fenton reaction was designed and used for sulfamethazine (SMR) antibiotics degradation. Firstly, a highly active oxygen-doped carbon nitride (CNO) nanosheet photocatalyst was synthesized using a simple and environmentally friendly approach. The prepared CNO nanosheets demonstrated increased exposure of active sites and improved separation of photoinduced electron-hole pairs, thus achieving a remarkable H 2 O 2 production rate of 863.8 μmol g −1 under visible light. Under the synergistic effect of a “photo-Fenton cycle” with Fe (II)，the CNO-based PSF system achieved efficient and stable removal of sulfathiazole (STZ) without external hydrogen peroxide addition. Consequently, the degradation efficiency of STZ under visible light increased significantly from 54.8 % to 98.2 % within 60 min, far exceeding the performance of pristine photocatalysts. This approach overcomes the limitations of traditional Fenton oxidation by enabling in-situ production and utilization of H 2 O 2 , and provides valuable insights into the design of photocatalytic self-Fenton processes for wastewater treatment.
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JOURNAL OF FOOD SCIENCE
·
2025
·Vol. 90
·期 12
·e70740
·
IF 3.4
Ge Ge,Li Lin,Jing Li,Jiabao Zheng,Weizheng Sun
This study investigated the impact of tea polyphenol extract (TPE) on soy protein isolate-stabilized emulsions in a simulated gastrointestinal model. Drop shape analysis was utilized to assess the interfacial behavior of the soy protein isolate (SPI) with added TPE in situ during the bile salts displacement and the upper gastrointestinal digestion. The interaction between SPI and TPE led to significantly low surface hydrophobicity (H0) of 781.6 ( p < 0.05), a large particle size of 156.42 nm ( p < 0.05), and a more negative charge of -18.7 mV ( p < 0.05) with the 0.04% TPE addition. A thick interfacial layer of 2.33 mg/m 2 ( p < 0.05) was shown in the SPI-stabilized emulsion with TPE addition. The SPI-TPE layer exhibited enhanced resistance to bile salt displacement only in the simulated intestinal model. Additionally, TPE addition decreased the release rate of free fatty acid (FFA) to 26.8% during simulated gastrointestinal digestion without bile salts. However, bile salts were able to counteract the inhibitory effect of TPE on lipid digestion. A better understanding of the upper gastrointestinal digestion of protein-stabilized emulsion is valuable for food innovation purposes.
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危险品化学品经营许可证（带存储）