Fuel Cells
·
2022
·
IF 2.948
Yanqi Hao,Lin Ge,Siew Hwa Chan
Looking for non-noble metal catalysts with low cost, high activity, and high stability to replace platinum in oxygen reduction reaction (ORR) has aroused great concern. According to previous studies, Fe-N x /C material is one of the most promising non-noble metal catalysts for ORR. In this study, new Fe-N x /C material was synthesized by introducing CeO 2 and Fe 3 O 4 nanoparticles into a Fe-N x /C material derived from ZIF-8 as precursors. The new material was called CeO 2 -Fe 3 O 4 @Fe-N/C catalyst and the activity of the catalyst was found to be significantly improved in 0.1 mol L −1 KOH. The half-wave potential of CeO 2 -Fe 3 O 4 @Fe-N/C (0.892 V) is higher than that of Pt/C by 67 mV. In the stability test, the half-wave potential of CeO 2 -Fe 3 O 4 @Fe-N/C was only reduced by 4 mV after 5,000 cycles. The high performance is attributed to the introduction of CeO 2 and Fe 3 O 4 , which gives CeO 2 -Fe 3 O 4 @Fe-N/C enhanced electrocatalytic activity and long-term stability. This approach makes CeO 2 -Fe 3 O 4 @Fe-N/C a promising candidate for cathode catalysts in renewable energy conversion devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Jianyu Dong,Shaofeng Wu,Furong Geng,Yani Yan,Long Liu,Yongbo Zhou
A metal-free and selective oxidative methyl C–H functionalization of BHT with aniline compounds has been developed. This innovative method enables the facile and efficient synthesis of a diverse array of BHT-functionalized N-containing skeletons, including arylamines, benzoxazoles, benzothiazoles, benzimidazoles, quinazolines, and quinazolinones, all of which are challenging to access. The control experiment involving TEMP18O suggests that the radical adduct of TEMPO with the benzyl radical of BHT may serve as an intermediate.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2015
·
IF 1.648
Yu Jiang,Yanye Wu,Yinlei Huo
Series of thermo-sensitive hydrogels (PNAs) based on N-isopropylacrylamide/acrylamide interpenetrating polymer networks were synthesized via in situ free-radical polymerization. Poly (ethylene glycol diacrylate) and poly (ε-caprolactone diacrylate) were synthesized as macro-cross-linkers due to their excellent biocompatibilities. The macro-cross-linkers and hydrogels were characterized by 1H NMR and FT-IR, respectively. The interior morphology of the hydrogels was observed by scanning electron microscopy. The swelling ratios at different temperatures and the swelling/deswelling kinetics of the hydrogels were studied. Their volume phase transition temperatures were also measured by differential scanning calorimetry characterization. The results indicated that the PNA hydrogels had uniform macroporous structures, and they not only had considerable swelling ratios, but also exhibited rapid swelling/deswelling kinetics and response sensitivities. In addition, the weight ratio of AAm/NIPAAm also affected the swelling performance and phase transition temperature of hydrogels, and its value less than 5% was the optimal proportion to achieve excellent comprehensive properties. Levofloxacin lactate and Naproxen were selected as drugs and simulated in vitro condition release, and the drug release results showed that the PNA hydrogels behaved fast release performance.
研究领域:
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Yangyang Wang,Qiang Ren,Wenhao Zhan,Kaixuan Zheng,Qi Liao,Zhihui Yang,Yansong Wang,Xinling Ruan
A previous isolated Gordonia sp. (Lff) was used to degrade di-n-octyl phthalate (DOP) contamination in both aqueous solution and soil. The influence of temperature, pH, inoculum size, salt content and initial concentration of DOP on DOP degradation by Lff were analysed. The response of soil bacterial community to DOP and Lff was also analysed by Illumina MiSeq sequence method. Results showed that the optimal temperature, pH, inoculum size and salt content were 35oC, 8.0, 5% and <5%, respectively. Under the optimal condition, more than 91.25% of DOP with different initial concentrations (100–2000 mg/L) could be degraded by Lff. Kinetics analysis indicated that biodegradation of DOP by Lff could be described by first-order kinetics (R2 > 0.917) with the half-life (t1/2) changing irregularly between 0.58 and 0.83 d. In addition, Lff enhanced the removal of DOP in soil and alleviated the toxicity of DOP on soil microorganisms. Furthermore, its influence on soil bacterial community is not obvious. These results suggested that Lff was effective in remediating DOP contamination in different environments.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
Heliyon
·
2022
·
IF 3.776
Xiang Liu,Yongliang Wang,Li Xiao,Licheng Ma,Peiwei Han,Shufeng Ye
Gold is a valued, critical element whose chemical activation or extraction is challenging. Non-cyanide extraction of gold is now the focus, and N-bromosuccinimide(NBS) is attracting attention. Herein, new insights into the possible mechanism are deeply revealed through comprehensive analysis and detection of the reaction by using elementary gold and gold bearing ore. Experiments on gold foil indicate that Au can be activated in NBS solution to perform a satisfactory dissolution. Application of NBS in gold extraction from ore show a high yield of 86.24% under optimal conditions of NBS dosage 0.05 M, liquid-solid ratio 4:1, stirring speed 400 rpm, pH 8, 25 °C and leaching for 20 h, while yields of other coexisting metals are nearly negligible. The process leads to direct, efficient, one-pot conversion of gold, into simple water-soluble salts. Characterizations show that the framework of NBS are not destroyed, only bromine separates from the framework. The oxidation of neutral gold atom to trivalent Au (III) occurs in a mild, clean and room-temperature chemistry, which converts gold to [AuBr 4 ] - , and the framework to succinimide. The active bromine and radical Br (Br•) generated from in-situ autocatalysis of NBS are responsible for this. The systematic results herald a green procedure for preparation of gold derivatives and gold extraction industry.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Sustainability
·
2025
·Vol. 17
·期 10
·4358
·
IF 3.3
Yuantao Han,Yuchuan Ye,Wanjin Yu,Shaohong Zang,Lili Ji,Shijie Li,Liuye Mo
The synthesis of high performance catalysts for the catalytic wet oxidation (CWO) of N-methyldiethanolamine (MDEA) in water remains a challenge, and is a topic of considerable importance in relation to sustainability. In this paper, a Ru-CNx/CeO2catalyst was synthesized through a modified impregnation process for the CWO of MDEA, exhibiting a high activity of 80% COD removal at 180 °C and 2.5 MPa. EPR, Raman, and XPS characterizations revealed that the CNxspecies facilitated the reduction in Ru4+to Ru0species and enhanced the Ru–Ce interaction to form a high-density Ru-O-Ce structure with Ce3+sites, which strongly correlate to the generation of oxygen vacancies. The oxygen vacancies enabled the adsorption and activation of the oxygen, generating active species (h+, ·O2−, and ·OH) that effectively oxidized the MDEA during the catalytic reaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Md Manik Mian,Guijian Liu,Biao Fu,Yu Song
Sewage sludge (SS), the inevitable byproduct of wastewater treatment plants, is facing numerous challenges of environmentally safe and cost-effective disposal. Thus, exploration of efficient SS valorization technique is highly desired. In this study, a sludge derived carbon-supported MnO x as a catalyst (ASMn-Nb) was synthesized through NH 4 OH activation and pyrolysis (800 °C) to enhance peroxymonosulfate (PMS) decomposition and subsequent degradation of acid orange 7 and rhodamine B. The sample characterization indicated that MnCl 2 conditioning produces mixed valent Mn oxides on ASMn-Nb, while NH 4 OH activation significantly enhances N-heteroatoms, surface area, and microporosity. The as-synthesized hybrid catalyst exhibited excellent PMS decomposition ability in a wide range of pH, which enhances AO7 removal efficiency 16%–100% in 40 min compared with that treated with raw sludge biochar. Moreover, the catalyst is recyclable, chemically stable, and produce negligible metal leaching during catalysis. Further investigation of catalytic mechanisms revealed that both radicle and non-radicle processes governing PMS decomposition, whereas mediated electron transfer as the primary and 1 O 2 , SO 4 − , and OH radicals induced catalysis as the secondary mechanisms of PMS activation and subsequent AO7 degradation. Finally, a probable mechanism of PMS decomposition over ASMn-Nb and AO7 degradation path is proposed. This study concurrently provides a facile route of improving the catalytic performance of sludge derived-biochar and a probable SS valorization technique.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hongtao Wang,Yueyue Li,Chenchang Wang,Yuan Li,Jihao Bai,Yueying liu,Linsheng Zhou,Fengmin Liu,Kengo Shimanoe,Geyu Lu
As one of the most promising “next generation” alcohol fuels, n-pentanol brings convenience to our lives as well as challenges. Realizing real-time monitoring of n-pentanol is important to the health of workers in chemical plants. In this work, a series of Au nanoparticles functionalized ZnO nanorods were prepared by a facile one-step solvothermal method. The electronic sensitization and chemical sensitization of Au nanoparticles regulate the thickness of initial depletion layer of ZnO nanorods and increase the amount of adsorbed oxygen species on the surface. The gas-sensing results showed that 2 mol% Au nanoparticles functionalized ZnO nanorods exhibited the highest response of 71.8 to 4 ppm n-pentanol at 260 °C, and showed much higher response than other various saturated monohydric alcohols with different carbon chain lengths. Moreover, the sensor possessed ultra-fast response speed (1 s), excellent stability, and a certain ability of moisture resistance. The sensor was heated at 350 °C to promote the desorption of n-pentanol. The surface depletion layer model and energy band theory were used to explain the enhanced gas-sensing performance. This work provides a suitable candidate for real-time monitoring of n-pentanol in chemical plants.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
环境监测
·
职业健康
✓ 已验证
DOI
高影响因子
BIOORGANIC CHEMISTRY
·
2025
·
IF 4.7
Ruobin Sun,Qipeng Yan,Wenhao Deng,Pengcheng Chen,Dan Wu,Pu Zheng
Achieving enzyme catalysis at high substrate concentrations is a substantial challenge in industrial biocatalysis, and the role of glycosylation in post-translational modifications that modulate enzyme substrate inhibition remains poorly understood. This study provides insights into the role of N -glycosylation in substrate inhibition by comparing the catalytic properties of d -lactonohydrolase ( d -Lac) derived from Fusarium moniliforme expressed in prokaryotic and eukaryotic hosts. Experimental evidence indicates that recombinant d -Lac expressed in Pichia pastoris ( Pp Lac-WT) exhibits higher hydrolysis rates at a substrate concentration of 400 g/L, with reduced substrate inhibition and enhanced stability compared to the recombinant d -Lac expressed in Escherichia coli ( Ec Lac-WT). Mutant Pp Lac-M1 achieves a conversion rate of 40 % at a substrate concentration of 400 g/L, with a space–time yield of d -pantoic acid reaching 91.1 g/L/h. Proteomics analysis reveals that residues N29 and N278, located approximately 10–20 Å from the active site undergo N -glycosylation in Pp Lac-WT. Using microsecond-scale molecular dynamics simulations and Markov state models, we elucidate the effects of glycosylation on the conformational flexibility of two key loops at the entrance of the binding pocket. Specifically, the loops in Pp Lac-WT can transition between open and closed states, whereas those in Ec Lac-WT tend to remain open. In high substrate concentration conditions, the open state causes congestion, leading to substrate inhibition. Shortest-path map analysis confirms that substrate entry is dynamically controlled by residue N29 on the loops surrounding the active site. Our findings enhance the understanding of the effects of glycosylation on enzyme conformational dynamics and provide insights into mitigating inhibition at high substrate concentrations.
研究领域:
生物化学
·
酶工程
·
结构生物学
✓ 已验证
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 8
·1743-1751
·
IF 7.779
Hao Wang,Yuruo Qi,Fangyuan Xiao,Pan Liu,Yi Li,Shu-juan Bao,Maowen Xu
The construction of highly conductive structures with excellent adsorption–catalytic properties to accelerate electron transfer and suppress polysulfide shuttle is considered as an effective strategy to achieve well-performing sodium–sulfur batteries. Herein, a self-supported tessellated N-doped carbon/CoSe2 (NCCS) is developed as a sulfur host for sodium–sulfur batteries by a simple deposition–selenization of lyophilized bacterial cellulose (BC), where NC acts as a conductive network to ensure the rapid initiation of efficient catalytic reactions at the tessellated CoSe2 interface and maintain good structural stability. The CoSe2 nanoparticles provide strong ability in anchoring, trapping and catalyzing polysulfides. As a result, the prepared tessellated NCCS@S cathode demonstrates a high initial discharge specific capacity of 871.3 mA h g−1 at a current rate of 0.1C and good electrochemical stability for up to 500 cycles at 1C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Dong Yan,Dong Chen,Jia Tan,Liping Yuan,Zizhi Huang,Dongfang Zou,Penghao Sun,Qiang Tao,Jiyong Deng,Yunchu Hu
A new and efficient flame retardant consisting of Ammonium tris (2-hydroxyethyl) isocyanurate triphosphate (ATITP) was prepared by a solvent-free synthesis method for improving the flame retardancy of poplar wood density boards. The flame retardant mechanism was probed, and the mechanism of capturing combustion radicals, synergistically promoting charring and inhibiting heat was summarized. The density board treated with 20% ATITP had an ultimate oxygen index (LOI) of was up to 65.1%. In the experiment of cone calorimetry (CONE), the total heat release (THR) of flame retardant density board was reduced by 73.9% compared with the pure density board sample, while the heat release rate (HRR), CO and CO 2 production were significantly reduced. In addition, the analysis with a thermogravimetric infrared coupler (TG-FTIR) and thermal cracking gas mass spectrometer (Py-GC–MS) revealed that the flame retardant exerted a gas-phase and condensed-phase flame retardant during the thermal decomposition process to alter the thermal cracking pathway of wood powder. It was demonstrated that the poplar density board treated with ATITP has good flame retardancy, which provides a simple and efficient method for flame retardant density board for building materials.
研究领域:
材料科学
·
林业工程
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2021
·Vol. 7
·期 3
·2001003
·
IF 7.295
Zuoxiang Xie,Kai Feng,Yan Xiong,Xu Chen,Yudong Liang,Kamran Abid,Ling Xu
In recent years, organic–inorganic hybrid halide perovskite materials have been found to have low thermal conductivity and a large Seebeck effect, giving them great potential for thermoelectric applications. More stable single crystals make this possible. In this work, high-quality MAPbI 3 single crystals are prepared using a modified solvent engineering method, and their trap density is as low as 2.5 × 10 9 cm −3 . It is noticed that the reaction between the crystal a metal electrode causes different degrees of doping effect along the vertical direction, leading to an increase in the intrinsic P-type with Au metal, and forming N-type semiconductor characteristics with Ag metal. A high Seebeck voltage thermoelectric module is obtained by combining the perovskite single crystal with different conductive characteristics. After device optimization, the thermoelectric potential of the champion module reaches a high voltage of 337 mV at 115 °C, the maximum output power with load reaches about 30 nW, and the theoretical maximum power reaches 65 nW. It is hoped that this research can promote the development of low thermal conductivity perovskite materials in the thermoelectric field.
研究领域:
材料科学
·
能源技术
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）