Current Analytical Chemistry
·
2024
·Vol. 22
·期 1
·84-91
·
IF 1.7
Si Chen,Yiming Nie,Qing Liu,Fang Chen
Background4-n-butylresorcinol (4nBR) was widely used in the treatment of chloasma and skin whitening cosmetics. As a decolorizing agent, it can effectively control the activity of tyrosinase. Market regulatory authorities require truthful labeling of ingredients in cosmetics. Therefore, the quantitative determination of 4nBR is of great practical significance.HypothesisAt present, the main detection method of 4nBR reported in the literature is HPLC. Compared with the HPLC method, optical methods offer several advantages, including low cost, and simplicity, which make them suitable for on-field detection applications. A convenient spectrophotometric method was established for 4nBR detection.MethodsFe3+ can oxidize the common colorless chromogenic substrate 3,3',5,5'-tetramethylbenzidine (TMB) to blue oxTMB. Based on the fact that 4-n-butyl resorcinol (4nBR) can reduce oxTMB, a convenient and rapid spectrophotometric method for the determination of 4nBR was proposed.ResultsUnder the optimum conditions, the absorbance at 652 nm has a good linear relationship with the concentration of 4nBR in the range of 1.2 - 16 μM. The linear equation for the detection of 4nBR was ΔA = 0.0546 c (μM) - 0.0026 (r2=0.9962), and the detection limit was 0.33 μM. The accuracy of this method is comparable to that of HPLC.ConclusionThis method has good selectivity for 4nBR and good anti-interference ability for common additives in cosmetics. The proposed method can be applied to the determination of 4nBR in thereal samples.
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Materials
·
2026
·Vol. 19
·期 10
·2029
·
IF 3.7
Changsheng Ye,Xin Shan
Ionic thermoelectric (i-TE) materials have attracted increasing attention for low-grade heat harvesting owing to their high thermovoltage output under small temperature gradients. However, the development ofn-type i-TE materials remains challenging. Electrode-enabled polarity regulation provides a promising alternative to material-design strategies for developingn-type i-TE devices. In this work, a poly(vinyl alcohol) (PVA)-based ionic hydrogel was prepared with dimethyl sulfoxide (DMSO) and potassium chloride (KCl) through a freeze–thaw process, and its thermoelectric behavior was regulated by electrodes. While the i-TE hydrogel device with typical Cu electrodes exhibitedp-type behavior, replacing the electrodes with graphite paper (GP) electrodes converted the device response fromp-type ton-type. Morphological and spectroscopic analyses suggest that the GP surface selectively adsorbed K+ions through cation–π interactions, suppressing cation thermodiffusion and enabling Cl−-dominated ion migration under a temperature gradient. As a result, the PVA-GP device achieved a maximumSiof −4.36 ± 0.26 mV K−1. In addition, the device exhibited favorable thermoelectric output, with a maximumPFiof 57.668 μW m−1K−2, a room-temperatureZTof 0.0864, and a peak transient power density of 2.33 mW m−2during short-time discharge. Owing to the large interfacial area of the GP electrodes, the device could also function as an ionic thermoelectric supercapacitor with appreciable energy-storage capability. This work demonstrates an effective electrode-engineering strategy for constructingn-type i-TE devices and provides a feasible route for simultaneous low-grade heat harvesting and transient energy storage.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Jiawei Wu,Silin Yang,Yongping Li,Liwei Liu,Junle Qu,Jun Song,Jiaqing Guo
NSCDs show a 180-fold intensity change and an 80 nm polarity-induced red shift. • NSCDs target LDs and enable sustained imaging of individual LDs. • Live-cell imaging captured individual LD metabolic responses and fusion-like remodeling. Lipid droplets (LDs) undergo remodeling of their polarity microenvironment during abnormalities in lipid metabolism, accompanied by changes in LD abundance and size. However, the narrow ranges of polarity response, insufficient targeting specificity, and limited stability of existing probes hinder the dynamic and accurate monitoring of individual LDs. Here, we developed nitrogen and sulfur codoped carbon dots (NSCDs) for monitoring polarity-related microenvironmental responses of individual LDs under metabolic perturbations. NSCDs exhibited a solvent-dependent decrease in fluorescence intensity and an approximately 80 nm red shift in emission. NSCDs were rapidly internalized and preferentially localized in LDs. Nutrient deprivation and inhibition of triacylglycerol synthesis decreased area-normalized NSCDs fluorescence, whereas OA-induced lipid accumulation increased it, reflecting distinct polarity-related microenvironmental responses. Furthermore, time-lapse imaging captured local events resembling LD fusion during SR59230A treatment, accompanied by enhanced local fluorescence during these remodeling events. These results support the use of NSCDs for dynamically monitoring polarity-related microenvironmental responses of individual LDs under metabolic perturbations Download: Download high-res image (127KB) Download: Download full-size image
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Small
·
2026
·
IF 11.8
Ziqi Dong,Feng Niu,Zeqi Wu,Xiaofan Zhou,Junyan Li,Dilshod Nematov,Saidjafar Murodzoda,Huaizhou Jin,Da Chen
The activation of inert C(sp 3 )-H bonds is the rate-determining step in photocatalytic selective oxidation of toluene, and the easy over-oxidation of target products makes it a great challenge in green organic synthesis. Herein, we report a semi-heterogeneous CeCl x -NHPI complex, which is constructed via the coordination of CeCl 3 and N-Hydroxyphthalimide (NHPI) for the efficient visible-light-driven selective oxidation of toluene to benzaldehyde under ambient conditions. Impressively, the catalyst achieved a maximum benzaldehyde formation rate of up to 2 mmol·g −1 ·h −1 in 5 h, with a benzaldehyde selectivity of 80.6%. Mechanistic studies show that the chlorine radicals (Cl·) generated from the coordinated Ce─Cl bond via the ligand-to-metal charge transfer (LMCT) process, and the phthalimide-N-oxyl (PINO) radicals formed from NHPI via single-electron transfer jointly promote the efficient activation of the inert C(sp 3 )-H bond in toluene. In addition, the CeCl x -NHPI complex exhibits good recyclability and broad substrate tolerance for the selective oxidation of various toluene derivatives. This work provides a novel strategy for the design of efficient rare earth-based semi-heterogeneous photocatalysts for the activation of C(sp 3 )-H bonds.
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ENERGY & FUELS
·
2026
·Vol. 40
·期 34
·19056-19065
·
IF 6
Yang Tao,Zhu Xiaofeng,Zhang Shicheng
The large-scale production of sustainable
aviation fuels
(SAFs)
heavily relies on hydrogen supply, while traditional hydrogen storage
and delivery suffer from safety risks and high cost. Hydrogen peroxide
(H 2 O 2 ) is regarded as a promising hydrogen carrier,
which can be produced on-site through a green electrochemical two-electron
oxygen reduction reaction (2e – ORR). Herein, oxygen,
nitrogen co-modulated carbon (O-NC) catalysts were fabricated by doping
N dopants and oxygen-containing functional groups (OFGs). The pyrrolic
N is revealed to jeopardize the electronic structure of the NC catalyst,
and the OFGs can further regulate the NC matrix for 2e – ORR. As a result, the optimized O-NC-5 catalyst exhibits an excellent
H 2 O 2 selectivity of over 80% in both alkaline
and neutral electrolytes. After further optimizing Nafion content,
catalyst loading, and operating conditions of O-NC-5-based gas diffusion
electrodes, the assembled flow cell can deliver a high H 2 O 2 yield of 3.4 mol g cat –1 h –1 and Faradaic efficiency of above 90%, with
robust stability over 12 h. This work reveals the synergistic effects
of N dopants and OFGs toward 2e – ORR performance
and offers a feasible strategy to develop high-performance carbon
electrocatalysts and practical electrode systems for green H 2 O 2 production, which supports the SAF synthesis.
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INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 33
·19601-19611
·
IF 4.6
Zhang Shi-Rui,Wang Xiao-Ming,Xie Zi-Juan,Xia Yuan-Guang,Cheng Zhao-Yi,Yin Wen,Li Jia-Chen,Zhang Hu,Yang Zu-Pei,Kuang Xiao-Jun,Jiao Huan
Mixed-anion defect engineering is
an effective strategy
for tuning
local structures and ion transport in complex oxides. Herein, we report
the Li 3 N-assisted synthesis of the oxynitride La 24 Li 23 Ti 5 O 53 N 3 (LLTON)
and clarify the role of O/N incorporation in defect reconstruction
and Li-ion migration. Structure analyses reveal that nitrogen preferentially
substitutes apical oxygen sites in Li/Ti octahedra, inducing Li-site
redistribution and oxygen-vacancy formation. These coupled defects
reconstruct the local coordination environment and disrupt the ordered
defect arrangement of the parent oxide while retaining the tetragonal
framework. Variable-temperature diffraction further reveals a thermally
driven structural evolution involving Li-site reorganization, enhanced
positional disorder in the fluorite-related lithium sublattice, and
a halving of the crystallographic repeat along the c direction. Ab
initio molecular dynamics (AIMD) and bond valence site energy (BVSE)
calculations show that these defect-induced and thermally activated
rearrangements lower the Li-ion migration barrier and promote preferential
one-dimensional migration along the c direction. Consequently, LLTON
delivers an ionic conductivity of 3.78 mS cm –1 at
400 ° C, with the activation energy reduced from 0.88 to 0.67
eV. This work establishes a structure–defect–evolution–transport
correlation in mixed-anion oxides and highlights O/N defect engineering
as a useful approach for regulating ion migration in complex oxide
materials.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Mengcan Ju,Lili Yan,Zhiwen Cheng,Tiantian Li,Guanghui Li,Pinhua Rao,Qincheng Chen,Benjiao Huo
Persulfate-based advanced oxidation processes catalyzed by heterogeneous Fe-carbon composites represent a promising and competitive technology for the degradation of antibiotics. Herein, an environmentally friendly carbon material derived from tobacco stalk biomass was developed using potassium ferrate as both activator and Fe source, with urea serving as the N precursor. Magnetic N-doped biochar (H-Fe-N@BC) with abundant microporous-mesoporous structures and a high graphitization degree was obtained, and loaded Fe 3 N made the biochar with magnetism and simultaneously improved the ability of potassium persulfate (PS) activation in antibiotic-sulfamethazine (SMT) degradation. SMT (the initial pH≈7) could be degraded to 90.8 % within 15 min in the H-Fe-N@BC/PS system. In addition, H-Fe-N@BC maintained excellent catalytic activation performance under acidic and weakly basic conditions, and Cl - promoted the SMT degradation, while CO 3 2- and HPO 4 2- exerted inhibitory effects. The degradation mechanism by H-Fe-N@BC mainly consists of O 2 · − -dominated radical pathway as well as 1 O 2 and electron transfer-dominated non-radical pathway. Variation in composition of biochar and density functional theory calculation revealed that C O, graphite N, and Fe 3 N sites were crucial for activating PS to degrade SMT. These findings are of great significance by converting tobacco straw waste into high value-added biochar products with multiple active sites and applying them in the remediation of antibiotic-contaminated environment.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Canyang Zhang,Yin Liang,Chao Chen,Wei Zhao,Bolong Li,Jianghao Wang,Zhenyu Zhang,Huiping Ji,Feng Zhou,Kaige Wang,Reinout Meijboom,Jie Fu
The decarbonylation of biomass-derived fatty acids (CnH2n+1COOH) presents a sustainable method for producing high-value alkenes (CnH2n). However, the development of efficient and highly selective catalysts for fatty acid decarbonylation remains challenging. In this work, we prepared a series of CoPhPhen/MWCNT-X catalysts by pyrolyzing a 4,7-diphenyl-1,10-phenanthroline (PhPhen) Co complex immobilized on multi-walled carbon nanotubes. In the model decarbonylation reaction of stearic acid, the optimized CoPhPhen/MWCNT-900 catalyst demonstrated remarkable catalytic efficacy, with 81.6% conversion of stearic acid and 58.3% yield of heptadecene. Characterization and comparative experiments demonstrated that the substantial phenyl groups in the PhPhen ligand engage in strong π-π interactions with the MWCNT, effectively inhibiting the migration and aggregation of cobalt single atoms during pyrolysis and thus maintaining a high density of active Co single-atom sites. Further electronic structure investigation revealed that the local electron density around the cobalt species markedly rises with higher pyrolysis temperatures, and this electronic impact exhibits a distinct positive association with the decarbonylation performance of catalysts. In situ DRIFTS was employed to reveal the adsorption and reaction process of fatty acids on the Co single-atom active sites: The fatty acid molecule first coordinates to the cobalt center via the carbonyl oxygen, followed by successive dehydration and decarbonylation processes, finally yielding H2O, CO, and olefins.
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Nanomaterials
·
2021
·Vol. 11
·期 11
·2798
·
IF 5.076
Huaidong Wang,Chong Qi,Ailing Yang,Xiaoxu Wang,Jie Xu
High fluorescent graphene quantum dots (GQDs) are promising in bioimaging and optoelectronics. In this paper, bright blue fluorescent N-doped GQDs were synthesized using a ultrasonic-assisted hydrothermal method. The morphology, structure, surface chemistry, optical properties, and stability subject to photo-bleaching, temperature, pH and preservation period for the N-GQDs were investigated in detail using various microscopy and spectroscopy techniques. The results showed that the N-GQDs possessed an average size of 2.65 nm, 3.57% N doping, and up to 54% quantum yield (QY). The photoluminescence (PL) spectra of the N-GQDs are excitation dependent when excited in the range of 300–370 nm and excitation independent in the range of 380–500 nm for the core and surface states emission. The N-GQDs showed excellent photo-bleaching resistance and superior photo-stability. At room temperature and in the pH range of 3–8, the fluorescence of the N-GQDs was almost invariable. The N-GQDs can be stably preserved for at least 40 days. The average decay lifetime of the N-GQDs was 2.653 ns, and the radiative and nonradiative decay rate constants were calculated to be 2.04 × 108s−1and 1.73 × 108s−1, respectively. The PL mechanism was qualitatively explained. The N-GQDs was used for cell imaging, and it showed good results, implying great potential applications for bioimaging or biomarking.Keywords:ultrasonic-assisted hydrothermal;nitrogen doped graphene quantum dots;optical properties;photo-stability;cell imaging
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ACS Omega
·
2025
·
IF 4.3
Songya Cui,Jiashuo Wang,Chengxiang Tian,Xiaoyu Xu,Dongxue Han,Guang Chen,Yufeng Yu,Liang Peng
Sodium-ion batteries (SIBs) are restricted in their energy storage capacity primarily because the considerable size of Na+ and inherently slow redox processes limit efficient charge transfer. Transition metal chalcogenides with layered structures have considerable promise as advanced materials of SIBs. Herein, the Ni-doped hollow MoS2/NC spheres with nitrogen-doped carbon are fabricated by a simple water/ethanol system combined with thermal annealing. Nickel doping effectively modifies the electronic properties of MoS2, leading to a substantial improvement in electrical conductivity and an increase in the density of electrochemically active sites. The addition of nitrogen-doped carbon within the composite helps to improve redox kinetics, ensuring improved structural integrity. Consequently, the Ni-MoS2/NC anode demonstrates excellent cycling stability, delivering a capacity of 176 mAh g–1 at 5.0 A g–1 for 10,000 cycles. Moreover, a full battery paired with a Na3V2(PO4)3/C cathode exhibits impressive rate performance, when the current is restored to 0.1 A g–1, and it showed a high specific capacity of 326 mAh g–1, which indicates that the Ni-MoS2/NC||Na3V2(PO4)3/C full battery exhibits robust performance across varying current densities, maintaining high electrochemical reversibility. This effective approach ensures improved electrochemical performance, prolonged cycling life, and higher efficiency, making hollow nanostructures a promising design for next-generation energy storage systems.
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Juguo Dai,Lili Luo,Xiaohong Wang,Long Xia,Hongmei Xie,Chunying Yang,Ruipan Wang,Yiting Xu,Lizong Dai
Nowadays, energy conversion devices have gradually gained attention while vigorously developing clean energy. Carbon materials are promising candidates for supercapacitors , but two issues have plagued the researchers. 1) Does the cation radius in the neutral electrolyte significantly impact the electrochemical performance of carbon materials? 2) How to introduce heteroatoms while constructing hollow structures in carbon spheres. This work proposes a facile template free strategy that uses aniline and pyrrole as nitrogen sources to synthesize carbon sphere precursors. High-temperature carbonization combined with alkali treatment leads to the formation of N-doped hollow porous carbon spheres. Robust wall structure (thickness is about 60–80 nm) and ideal surface structure (the specific surface area is 1079.9 m 2 g −1 ) endow the carbon spheres with excellent electrochemical performance and outstanding cycle stability. The specific capacitance of the carbon spheres in Li 2 SO 4 and Na 2 SO 4 electrolytes under negative working potential (−0.8–0 V) are 378.4 and 367.6 F g −1 , respectively, at a current density of 1 A g −1 . After 5000 cycles, the capacitance retentions are 87.1% and 94.8% in Li 2 SO 4 and Na 2 SO 4 electrolytes. We inferred that the cation radius has a negligible effect on the specific capacitance of carbon materials, but has a more significant effect on the cycling stability and capacitance rate performance. It is hoped that this work can provide a reference for the subsequent construction of N-doped hollow carbon spheres and reasonable selection of electrolytes.
研究领域:
材料科学
·
电化学
·
纳米能源
·
功能材料
·
储能技术
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2014
·Vol. 174
·期 6
·2236-2244
·
IF 1.687
Dai Yong,Shao Rong,Qi Gang,Ding Bin-Bin
In this study, it was the first report that the Brevibacterium lutescens CCZU12-1 was employed as a sulfur removing bacteria. Using dibenzothiophene (DBT) as the sole sulfur source, B. lutescens could selectively degrade DBT into 2-hydroxybiphenyl (2-HBP) via the “4S” pathway. In the basal salt medium (BSM) supplemented with 0.25 mM DBT and 0.5 g/L Tween-80, high desulfurization rate (100 %) was obtained by growth cells after 60 h. Furthermore, the n -octane–water (10:90, v / v ) biphasic system was built for the biodesulfurization by resting cells. Moreover, a combination of magnetic nano Fe 3 O 4 particles with calcium alginate immobilization was used for enhancing biodesulfurization. In this n -octane–water biphasic system, immobilized B. lutescens cells could be reused for not less than four times. Therefore, B. lutescens CCZU12-1 shows high potential in the biodesulfurization.
研究领域:
生物脱硫
·
环境生物技术
·
微生物技术
·
石油生物炼制
·
应用微生物学
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