ANALYTICA CHIMICA ACTA
·
2012
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IF 4.555
Fangxin Hu,Shihong Chen,Chengyan Wang,Ruo Yuan,Dehua Yuan,Cun Wang
In this paper, the reduced graphene oxide and multiwall carbon nanotubes hybrid materials (RGO–MWNTs) were prepared and a strategy for detecting environmental contaminations was proposed on the basis of RGO–MWNTs modified electrode. The hybrid materials were characterized by the scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and N 2 sorption–desorption isotherms. Due to the excellent catalytic activity, enhanced electrical conductivity and high surface area of the RGO–MWNTs, the simultaneous measurement of hydroquinone (HQ), catechol (CC), p-cresol (PC) and nitrite (NO 2 − ) with four well-separate peaks was achieved at the RGO–MWNTs modified electrode. The linear response ranges for HQ, CC, PC and NO 2 − were 8.0–391.0 μM, 5.5–540.0 μM, 5.0–430.0 μM and 75.0–6060.0 μM, correspondingly, and the detection limits (S/N = 3) were 2.6 μM, 1.8 μM, 1.6 μM and 25.0 μM, respectively. The outstanding film forming ability of RGO–MWNTs hybrid materials endowed the modified electrode enhanced stability. Furthermore, the fabricated sensor was applied for the simultaneous determination of HQ, CC, PC and NO 2 − in the river water sample.
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PubMed
高影响因子
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2017
·Vol. 33
·期 2
·1-9
·
IF 1.658
Zhang Jian-Fen,Chen Wei-Qing,Chen Hong
In this study, we report the cloning and expression of a functional glucoside 3-dehydrogenase (G3DH) gene from Sphingobacterium faecium ZJF-D6. This gene is 1686 bp in length and encodes a peptide of 562 amino acids. The G3DH gene was successfully expressed in E. coli , and the recombinant enzyme could oxidize glucosides, galactosides and analogues at C-3 position. The sequence and multiple alignment analysis showed that the enzyme has highest identity with G3DHs from Paraglaciecola polaris LMG 21857, Aliiglaciecola lipolytica E3 and Halomonas sp. alpha-15. The recombinant G3DH was purified on Ni–NTA column and exhibited the highest activity at pH 7.6 and 30 °C. It was sensitive to acid and alkali, and showed well thermostability. The SfG3DH could oxidize a wild range of sugars. When recombinant E. coli BL21 cells were used as catalyst, a high rate of conversion to N- p -nitrophenyl-3-ketovalidamine was achieved, and no p -nitroaniline was detected. This process offers a promising approach to fulfill substrate of 3-ketovalidoxylamine A C–N lyase production.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Qinqin Luo,Yulin Sun
To leverage strong P/N synergistic effects to impart high flame retardancy to epoxy resin without compromising overall performance, a novel flame retardant, 6-(pyrimidin-2-ylamino)dibenzo[c,e][1,2]oxaphosphinine 6-oxide (DAP), was synthesized by forming a P–N bond between 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) and 2-aminopyrimidine. Its structure was confirmed by NMR and mass spectrometry. Non-isothermal DSC tests demonstrated that DAP acted as a co-curing agent with 4,4′-diaminodiphenylmethane for diglycidyl ether of bisphenol-A and enhanced the curing rate. DAP significantly enhanced the flame retardancy of the epoxy resin at a low loading of 4 wt% (0.40 wt% phosphorus), achieving a limiting oxygen index (LOI) of 32.1% and a UL-94 V-0 rating. It also reduced heat and smoke release. The results from dynamic mechanical analysis (DMA) and mechanical property tests showed that the epoxy resin containing 4 wt% DAP retained a glass transition temperature comparable to the neat resin, along with slight improvements in mechanical properties, including flexural strength and modulus, non-notched impact strength, and tensile strength. The analyses of UL-94, cone calorimetric test (CCT), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis/infrared spectroscopy (TGA/IR), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) revealed that the flame-retardant mechanism involved both a condensed-phase char barrier and gas-phase quenching and dilution effects.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2010
·
IF 2.652
Wan-Zhong Lang,Xun-Wen Liu,Ya-Jun Guo,Bo Su,Lian-Feng Chu,Cui-Xiang Guo
We have demonstrated the synthesis of a novel MCM-41-supported bi-functional catalyst containing organoamine and Rh–P complex. We further characterized the catalysts by state-of-the-art analytical techniques including FTIR, UV–vis, 31 P CP MAS NMR, TGA, XRD, BET, TEM, ICP-AES and elemental analysis. The as-synthesized catalyst was applied to the one-pot synthesis of 2-ethylhexenal using propene as raw materials. FTIR, UV–vis, 31 P CP MAS NMR, and TGA results indicate that the active sites, organoamine and Rh–P complex, are successfully immobilized on the surface of catalyst support. The N and Rh content can be adjusted by adding different amounts of organoamine and Rh–P complex during the process of catalyst preparation. The mesoporous structure of the zeolite support remains intact after immobilization. However, the specific surface area and BJH pore size of the mesoporous zeolite support decrease after being grafted with organoamine and Rh–P complex. The bi-functional catalyst with primary amine has the best catalytic performances for the one-pot synthesis of 2-ethylhexenal since it has better synergistic effect with silanol groups, followed by diamine and then tertiary amine. The Rh content of the catalyst determines the hydroformylation reaction rate of propene, while the self-condensation of n -butanal is determined by the balance between organoamine and silanol groups. The results indicate the hydroformylation reaction is the control step of this tandem reaction when the content of Rh in the catalyst is below 0.19%. In contrast, this tandem reaction is controlled by the self-condensation of n -butanal with further increasing Rh content. We found that the catalyst containing 1.73% of N (primary amine) and 0.19% of Rh is a suitable choice. And we obtained the best yield of 2-ethylhexenal above 77% in the one-pot synthesis from propene.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2026
·
IF 6.4
Yufei Lao,Hongju Zeng,Bingshen Wu,Yuzhao Qi,Yinliang Zhang,Chuigen Guo,Liping Li,Jinmei Xu
Turning waste natural wood into high-performance carboned electrode. • Constructing N/P co-doped 3D network carbon skeleton within wood tracheids. • NPCW electrode exhibited a high specific surface and CO 2 capture capacity. • NPCW exhibits excellent CO Faradaic efficiency. • Pyrrolic N serves as the primary active site for CO 2 RR. Electrochemical CO 2 reduction reaction (CO 2 RR) has emerged as a pivotal strategy for mitigating excessive CO 2 emissions and achieving carbon neutrality. Carbonized wood (CW) possesses an intrinsic hierarchical porous structure and mechanical strength, rendering it a promising self-supporting and binder-free electrode material for electroreduction CO 2 . However, the catalytic activity of CW is limited due to its low specific surface area and insufficient active sites. Herein, we propose an innovative pore-construction strategy to prepare N/P co-doped 3D network carbon skeleton electrode (NPCW) by impregnating polyvinyl alcohol (PVA), phytic acid (PA), and urea into wood tracheids derived from waste natural wood. This strategy not only boosts electroreduction of CO 2 to CO, providing a sustainable and renewable carbon source for the chemical industry, but also solves the accumulation issue of waste wood that aligns with the green and sustainable principles. The optimized NPCW exhibits high specific surface area (972.6 m 2 g −1 ) and active site density. As a result, NPCW exhibits a remarkable CO 2 capture capacity (4.3 mmol g −1 ), an excellent CO Faradaic efficiency (FE CO ) of 96.7%, and a CO partial current density of −28.7 mA cm −2 , while retaining an FE CO above 80% after 48 h operation. This study offers a green and sustainable strategy to convert waste wood into high-performance carbon electrodes, offering a scalable paradigm for next-generation sustainable electrocatalysts. Download: Download high-res image (248KB) Download: Download full-size image This study proposes an innovative pore-construction strategy to fabricate an N/P co-doped 3D network carbon skeleton electrode (NPCW) by impregnating polyvinyl alcohol (PVA), phytic acid (PA), and urea into wood tracheids derived from waste natural wood. The optimized NPCW exhibits high specific surface area and excellent CO Faradaic efficiency.
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高影响因子
ACS ES&T Water
·
2026
·
IF 4.5
Chenglin Liu,Zhong Zhang,Siyuan Xiong,Sheng Wan,Zeyu Chen,Yao Cheng,Bintian Zhang,Xin Yang,Guomao Zheng
Identification of disinfection byproducts (DBPs) precursors remains a longstanding challenge due to the complexity of contaminated source water. Tire wear particles (TWPs) can be an overlooked source of DBPs precursors. To figure out the specific amine additives in tire rubber serving as potential nitrosamine precursors during chlorination, six frequently measured tire-derived amine additives, including N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine (6PPD), N-isopropyl-N′-phenyl-p-phenylenediamine (IPPD), N-cyclohexyl-N′-phenyl-p-phenylenediamine (CPPD), N,N′-dicyclohexylurea (DCU), diphenylamine (DPhA), and N,N′-dicyclohexylamine (DCHA), were selected to simulate their degradation processes, and their DBPs formation potentials were evaluated under various water matrices. IPPD was found to have a high molar yield of N-nitrosodimethylamine (NDMA, up to 8%), while 6PPD exhibited a lower molar yield (∼0.1%) with the molar ratio of chlorine-to-ammonium nitrogen (Cl2:N = 2) and disinfectant-to-precursor (D/P = 10). Suspect and target screening approaches were further applied to identify the transformation products of IPPD, and the formation pathway of NDMA via IPPD was proposed. Furthermore, we assessed NDMA formation from IPPD in simulated TWP leachates through chlorination experiments in the presence of ammonia, which revealed that IPPD contributed up to 24% of the total NDMA formed. This study offers new insights into the previously overlooked source of nitrosamines from tire-derived amine additives.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Jiaqi Geng,Zhichao Tian,Ruiping Wang,Junxiu Liu,Miaojun Xu,Huiying Wen,Mingyang Zhu,Bin Li
Linear low-density polyethylene (LLDPE) is flammable and produces severe molten droplets and toxic smoke, posing a great threat to life and property safety. To address these challenges, ZIF−67-derived nano-carbon-nitrogen-coated Co 3 O 4 (n-Co 3 O 4 @C-N) was synthesized and employed as a synergist for an intumescent flame retardant (IFR) in LLDPE. When IFR/n-Co 3 O 4 @C-N was introduced, LLDPE composites achieved a UL−94 V−0 rating and the limiting oxygen index of 26.8%. Cone calorimeter test results further demonstrated that the total heat release of LLDPE/IFR/n-Co 3 O 4 @C-N−3 decreased by 23.2% compared with pure LLDPE, indicating remarkable suppression of fire intensity. Compared with LLDPE/IFR and LLDPE/commercial-Co 3 O 4 , LLDPE/IFR/n-Co 3 O 4 @C-N−3 exhibited a reduction in total smoke production by 50.3% and 37.2%. The high specific surface area of n-Co 3 O 4 @C-N facilitates sufficient contact with the polymer matrix, enhancing catalytic carbonization and forming a robust graphitized char layer. Furthermore, as a p-type semiconductor, n-Co 3 O 4 @C-N has a narrower band gap, reducing the energy required for electron transition, and its higher hole concentration helps to oxidize more CO to low-toxicity CO 2 , thereby lowering the concentration of toxic gases. This study presents a promising strategy to fabricate flame-retardant, smoke-suppressing, and low-toxic LLDPE composites, thus effectively overcoming the existing technical limitations in wire and cable application fields.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2026
·
IF 8.1
Yu Sun,Keqing Zhou,Di Li,Yongqian Shi,Bin Yu,Sheng Zhang
The flammability of flexible polyurethane foam (FPUF) and the degradation of mechanical properties caused by traditional flame retardants limit its application in scenarios with high safety requirements. To address this, a P/N/Zn complex-functionalized graphene (PPZ@fGO) nanohybrid was synthesized and incorporated into the FPUF matrix. Structural characterization confirmed its successful synthesis and uniform dispersion. Adding 5% PPZ@fGO increased the mechanical strength to 15.17 kPa, a 400.67% improvement over the control FPUF. This enhancement is attributed to synergistic physical entanglement and chemical crosslinking between PPZ@fGO and the matrix. Concurrently, the composites exhibited significant reductions in peak heat release rate (PHRR, 31.6%), total heat release (THR, 28.7%), and total smoke production (TSP, 30.3%) compared to control FPUF. The fire growth rate index (FIGRA) was lowered by 42.3%, with thermogravimetric analysis revealing a higher char residue (11.9%). This was due to the catalytic carbon formation of metal ions, expansion charring of PPZ, the barrier effect of fGO, and the dilution effect of nonflammable gases. Furthermore, a standard room fire model based on Fire Dynamics Simulator (FDS) was constructed to investigate its practical application in real-world scenarios. Simulation results revealed that the modified foam effectively suppresses rapid fire spread and severe thermal escalation. Specifically, the peak ceiling temperature dropped by 600–700 °C, and the steady-state carbon monoxide (CO) concentration was reduced by nearly 50% within 600 s, substantially prolonging the available safe egress time. This work provides a solution for developing FPUF with outstanding flame retardancy, smoke suppression properties, and mechanical strength.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Weitong Wang,Yongdong Tang,Xiaozhe Liu,Bei An,Huijie He,Meijing Cao,Rongzhe Zhao,Yaxuan Chen,Xiaojing Yu,Shengchun Yang,Zhimao Yang,Bin Wang
B N pairs create push-pull coupling to upshift p-band center for optimal *OOH adsorption. • B,N co-doped carbon achieves 99% H 2 O 2 selectivity over wide window in 2e − ORR. • The catalyst yields 788 mmol g cat −1 h −1 H 2 O 2 in H-cell and stable 250 mA cm −2 operation for 14 h. • B N synergy breaks π-conjugation uniformity to enable near-unity 2e − ORR. Selective electrocatalytic two-electron oxygen reduction (2e − ORR) offers a green alternative to the energy-intensive anthraquinone process for hydrogen peroxide (H 2 O 2 ) production. However, the inert π-conjugation of carbon catalysts homogenizes the electronic environment of active sites, making it intrinsically difficult to achieve the optimal *OOH adsorption energy essential for high 2e − selectivity. In this study, we developed B,N co-doped carbon catalysts through a cost-effective pyrolysis method, achieving 99% H 2 O 2 selectivity across a remarkably wide potential window (0.20–0.70 V vs. RHE), an H-cell production rate of 788 mmol g cat −1 h −1 , and sustained operation in a flow cell at 250 mA cm −2 for 14 h with a Faradaic efficiency above 80%. It was demonstrated that engineering adjacent B N pairs within a carbon matrix established a localized push-pull electronic coupling that precisely upshifts the p-band center of active carbon atoms into the theoretically predicted “golden zone” for *OOH adsorption via combined experimental and theoretical analysis. These findings highlight the critical role of heteroatom doping in tailoring electronic structures and provide a scalable strategy for efficient, environmentally friendly H 2 O 2 production using carbon-based catalysts. This work develops B,N co-doped carbon catalysts that achieve 99% H 2 O 2 selectivity and 8 mol g cat −1 h −1 yield via 2e − ORR, leveraging synergistic doping and pyrrolic nitrogen optimization for scalable production. Download: Download high-res image (113KB) Download: Download full-size image
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高影响因子
Chem & Bio Engineering
·
2026
·
IF 8.4
Balamurali Ravichandran,Soujanya Prakash Bammanalli,Muthu Austeria P,Sabarinathan Ravichandran,Huiyuan Liu,Weiqi Zhang,Narayanamoorthy Bhuvanendran,Huaneng Su
Abstract Rechargeable zinc–air batteries (ZABs) require efficient and durable bifunctional oxygen electrocatalysts to accelerate both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, we report a hierarchical N, S, and P co-doped carbon catalyst (CoFe/NSP-HC) featuring CoFe core–shell alloy nanoparticles and Fe–Nx coordination motifs, synthesized through a pyrolysis strategy using heteroatom-enriched g-C3N4 as both template and dopant source. Structural characterization reveals a hierarchical porous architecture with uniformly distributed heteroatoms, strong metal–support interactions, and a well-defined Co-rich core/Fe-rich shell configuration. The synergistic integration of CoFe alloy interfaces, Fe–Nx coordination sites, and a defect-rich carbon framework effectively modulates the electronic structure and optimizes the adsorption/desorption behavior of oxygenated intermediates. Consequently, the optimized CoFe/NSP-HC catalyst exhibits bifunctional activity with an ORR half-wave potential of 0.82 V and an OER overpotential of 260 mV at 10 mA cm–2, delivering a low bifunctional potential gap (ΔE) of 0.67 V. Furthermore, the catalyst demonstrates robust electrochemical durability, maintaining stable ORR/OER performance after prolonged cycling. Density functional theory calculations reveal that Fe–Nx sites and Fe-based interfacial centers provide favorable reaction energetics for oxygen electrocatalysis, while Co species contribute to electronic modulation and kinetic enhancement. When employed as the air cathode in a rechargeable ZAB, CoFe/NSP-HC delivers a peak power density of 158.7 mW cm–2 and long-term cycling stability exceeding 350 h. This work provides an effective strategy for constructing multi-component electrocatalysts with synergistically engineered active sites for advanced metal–air energy storage systems.
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高影响因子
JOURNAL OF CATALYSIS
·
2026
·
IF 6
Long-Gen Hu,Guo-Sheng Zhang,Chen Chen,Pei-Ying Peng,Yong Lu,Xiao-Li Zhao,Ying-Xi Hua,Ye Liu
Hydrocarboxylation of alkynes using formic acid (FA) as carboxyl-source is highly challenging due to the competing decomposition of FA to H 2 /CO 2 and to CO/H 2 O to sacrifice the utilization efficiency of FA as well as to induce the side-reactions. Herein, a series of flexible and steric-bulky bis-P,O-ligands ( L1-L4 ) were synthesized and characterized on purpose to promote this reaction by avoiding unwanted FA-decomposition. It was found that L2 , characteristic with the most electron-rich nature, the bulkiest steric-hindrance, and the convenient P,P-chelation effect, enabled Pd(TFA) 2 highly active and selective for hydrocarboxylation of alkynes with FA under additive-free condition, affording the target α,β -unsaturated branched-carboxylic acids in the yield of 37–85 %. The in situ FT-IR analysis verified that the competing decomposition of FA like dehydrogenation to H 2 /CO 2 and dehydration to CO/H 2 O were completely inhibited, and the labile FA-based hybrid anhydride was the real product generated upon the catalysis of L2 -modifed Pd(TFA) 2 system.
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高影响因子
Materials Advances
·
2022
·Vol. 3
·期 20
·7546-7558
·
IF 0
Hecheng Ma,Jianjun Liu,Yimeng Wang,Shengli Zuo,Yingchun Yu,Baoshan Li
Photocatalytic degradation has been developed as a promising strategy for environmental remediation. Black phosphorus (BP) has attracted much attention in the field of photocatalysis due to the adjustable bandgap and high carrier mobility. In this work, we constructed a flower-like BP nanosheet/P-doped BiOCl (BP/P-BiOCl) S-scheme heterostructure via a simple co-precipitation method. The physicochemical properties such as the crystallinity, morphology, chemical environment, and optical and electronic properties of the as-fabricated materials were analyzed by using different analytical techniques. SEM data indicated the successful formation of a flower-like structure of BP/P-BiOCl composites. X-Ray photoelectron spectroscopy data indicated the formation of P-doped BiOCl. X-Ray diffraction and high resolution-TEM data revealed the formation of a hierarchical BP/P-BiOCl heterostructure. The catalytic activity of the as-synthesized samples (15%-BP/P-BiOCl) was tested towards RhB degradation (96% of 20 ppm RhB solution) and Cr(VI) reduction (90% of 20 ppm Cr(VI) solution) under solar light illumination. We demonstrated the formation mechanism of a flower-like structure in which positively charged BPNs assembled with negatively charged P-BiOCl by electrostatic attraction. Furthermore, we revealed the S-scheme photocatalytic mechanism to prove the enhanced photocatalytic activity of BP/P-BiOCl composites. The photodegradation of phenol, radical species trapping experiments and charge transfer route test were performed to prove the formation of the S-scheme. This work provides a facile route for the construction of a flower-like S-scheme heterostructure photocatalyst for efficient solar light photocatalytic performance.
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