Small
·
2024
·
IF 13
Yaqi Li,Sijie Wan,Weichen Liang,Bei Cheng,Wang Wang,Yao Xiang,Jiaguo Yu,Shaowen Cao
Owing to the improved charge separation and maximized redox capability of the system, Step-scheme (S-scheme) heterojunctions have garnered significant research attention for efficient photocatalysis of H 2 evolution. In this work, an innovative linear donor–acceptor (D–A) conjugated polymer fluorene-alt-(benzo-thiophene-dione) (PFBTD) is coupled with the CdS nanosheets, forming the organic–inorganic S-scheme heterojunction. The CdS/PFBTD (CP) composite exhibits an impressed hydrogen production rate of 7.62 mmol g −1 h −1 without any co-catalysts, which is ≈14 times higher than pristine CdS. It is revealed that the outstanding photocatalytic performance is attributed to the formation of rapid electron transfer channels through the interfacial Cd─O bonding as evidenced by the density functional theory (DFT) calculations and in situ X-ray photoelectron spectroscopy (XPS) analysis. The charge transfer mechanism involved in S-scheme heterojunctions is further investigated through the photo-irradiated Kelvin probe force microscopy (KPFM) analysis. This work provides a new point of view on the mechanism of interfacial charge transfer and points out the direction of designing superior organic–inorganic S-scheme heterojunction photocatalysts.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 12
·F1110
·
IF 3.259
Shumin Wang,Yong Qin,Yang Liu,Fuqiang Chu,Yong Kong,Yongxin Tao
Co,N,S-codoped three-dimensional graphene (Co,N,S/3DG) has been fabricated using Co(SCN)2 as the precursor. It has been found that Co,N,S/3DG is a highly efficient bi-functional electrocatalyst for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). It exhibits the high catalytic activity comparable to the Pt/C catalyst toward ORR, and the low overpotential of 260 mV to afford the current density of 10 mA cm−2 toward HER. The doping of S can promote the electrocatalytic performance of Co,N-codoped graphene due most likely to the defects induced by sulfur atom. The results provide new clues to design multi-functional electrocatalyst in energy storage and conversion.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ying Tian,Changqing He,Lin He,Hong Sui,Xingang Li
The low recovery rate of petroleum and the inevitable formation of large quantities of oil–water emulsions limit the efficiency of petroleum production, transportation, and storage. To address these issues, four nonionic interfacial regulators (PA-1, PA-2, PAMA-1, and PAMA-2) were developed by incorporating oxygen atoms into a polyether substrate via esterification and polymerization reactions. Additionally, PAMA-1 and PAMA-2 were further modified with sulfonyl groups. Experimental results demonstrated that all regulators exhibited high-efficiency cleaning and demulsification performance at 25 °C. These regulators achieved 100 % oil removal from mineral and metal surfaces without causing damage. Furthermore, they could effectively break different kinds of water-in-oil (W/O) emulsions. It is also found that over 95.33 % dewatering rate could be achieved at 20 °C in 15 mins when PAMA-1 (600 mg/L) is added into asphaltene-stabilized emulsion and complete dehydration (100 %) within 40 mins. These interfacial regulators possess high interfacial activity and are rich in polar groups (–COOR, –OH, O = S = O, –C–O–C–). Mechanistic studies revealed that the heteroatomic groups introduced into the regulators serve as active sites for noncovalent interactions reconstruction, forming hydrogen bonds with natural interfacially active substances (e.g., asphaltenes) and water molecules. This promotes oil dispersion on solid surfaces and disrupts the oil–water interfacial film, improving cleaning and demulsification efficiency. Importantly, pre-treatment with these interfacial regulators effectively prevents emulsion formation. These regulators hold significant potential for applications in oil–water and oil–solid separation processes during petroleum exploitation.
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TALANTA
·
2024
·
IF 5.6
Shanshan Lin,Yunsi Zheng,Yanlong Xing,Kun Dou,Rui Wang,Hongwang Cui,Rui Wang,Fabiao Yu
Staphylococcus aureus ( S. aureus ) is the most common pathogen in human purulent infections, which can cause local purulent infections, as well as pneumonia, pseudomembranous enteritis, pericarditis, and even systemic infections. The conventional methods including bacteria colony counting, polymerase chain reaction and enzyme-linked immunosorbent assay can't fully meet the requirement of highly sensitive detection of S. aureus due to their own disadvantages. Therefore, it's an urgent need to develop new platform to detect S. aureus in the early infection stage. In this study, a new surface-enhanced Raman scattering (SERS)-based nanoplatform based on dual-recognition of aptamer (Apt) and vancomycin (Van) was developed for the highly sensitive detection of S. aureus . The SERS nanoplatform consisted of two functional parts: aptamer-conjugated Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 -Apt MNPs) for bacteria enrichment and vancomycin modified-Au nanoparticles (Van-Au NPs) as the SERS probes for S. aureus quantitative detection. Upon the target bacteria enrichment, the SERS signals of the supernatant after magnetic separation could be obtained and analyzed under different concentrations of S. aureus . The limit of detection of the proposed assay was found to be 3.27 CFU/mL. We believe that the proposed SERS-based nanoplatform has great potential as a powerful tool in the early detection of specific bacteria.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 16
·1-12
·
IF 2.8
Wang Huiya,Zhang Kaina,Zhu Yaofeng
Anion-doped induced vacancy engineering is an effective approach to modulate polarization behavior and enhance the microwave absorption property. Herein, bamboo leaf-like polyaniline-mediated nitrogen and sulfur co-doped carbon (N/S–B–C) nanoflakes were demonstrated and successfully prepared by in-situ polymerization method and carbonization process with oxygen limitation. The hollow N/S–B–C nanoflakes are decorated by orderly aligned nanorods on the surface, which effectively balances the intrinsic high conductivity and strong polarization behavior of carbon material. The substitution of heterogeneous atoms disrupts the symmetry of local microstructures, leading to the dipolar resonances and/or vibration for enhancing dielectric loss. The N/S–B–C nanoflakes possess the minimum reflection loss ( RL min ) of − 53.5 dB at 10.2 GHz and corresponding effective absorption band (EAB) of 4.5 GHz at 2.9 mm. When the thickness is only 2.22 mm, the widest EAB is up to 5.15 GHz ranging from 12.30 to 17.40 GHz. This outstanding conductivity loss and interfacial polarization relaxation as well as the improved impedance matching from hollow structure synergistically determine excellent microwave absorption performance. This study provides an effective strategy for exploring the underlying relations between conduction loss and polarization behaviors in graphitized carbon.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Weiping Liu,Zhimin Dong,Jiayu Liu,Zifan Li,Youqun Wang,Xiaohong Cao,Zhibin Zhang,Yunhai Liu
Under xenon lamps, ZnFe2O4 (ZFO) has been shown to be effective in removing uranium through photocatalysis. However, its performance is still inadequate in low-light environments due to low photon utilization and high electron–hole complexation. Herein, S-doped hollow ZnFe2O4 microcubes (Sx-H-ZFO, x = 1, 3, 6, 9) were synthesized using the MOF precursor template method. The hollow morphology improves the utilization of visible light by refracting and reflecting the incident light multiple times within the confined domain. S doping narrows the band gap and shifts the conduction band position negatively, which enhances the separation, migration, and accumulation of photogenerated charges. Additionally, S doping increases the number of adsorption sites, ultimately promoting efficient surface reactions. Consequently, Sx-H-ZFO is capable of removing U(VI) in low-light environments. Under cloudy and rainy weather conditions, the photocatalytic rate of S3-H-ZFO was 100.31 μmol/(g·h), while under LED lamps (5000 Lux) it was 72.70 μmol/(g·h). More interestingly, a systematic mechanistic investigation has revealed that S doping replaces some of the oxygen atoms to enhance electron transfers and adsorption of O2. This process initiates the formation of hydrogen peroxide, which reacts directly with UO22+ to form solid studtite (UO2)O2·2H2O. Additionally, the promising magnetic separation capability of Sx-H-ZFO facilitates the recycling and reusability of the material. This work demonstrates the potential of ZnFe2O4 extraction uranium from nuclear wastewater.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yang Wang,Hui Li,Ji Li,Lina Zhou,Chunkai Feng,Guangwei Liu,Jianzhi Wang,Chen Hou
Perfluorohexane-1,3-dicarboxylic acid (GenX) is now widely used as a substitute for the prohibited perfluorooctanoic acid (PFOA), which has caused growing concerns about its persistence and potential hazards to human health. This study developed a biomass gelatin-derived N and S self-doped porous carbon electrodes (NSGC), for the electro-Fenton (EF) degradation of GenX. To facilitate absorotion, diffusion, and degradation in EF, the NSGC was fluorinated to enhance the selectivit and binding energy between the catalyst and GenX by the “F-F interactions”. The resulted F-NSGC reach 58.8% electroadsorption efficiency to GenX in 60 min, and then degraded 95.8% with a mineralization rate of 63.2% within 180 min. The degradation mechanism was discussed by identifying intermediate products. Moreover, the F-NSGC can maintain a good degradation effect in complex ionic background conditions and actual water samples. These findings extend the applications of biomass-based carbon electrodes and consolidate the effect of F-F interactions on degradation of GenX and other per- and polyfluorinated alkyl substances.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yujie Xiang,Zhengting Wang,Ying Zhang,Rui Gao,Yonggui Tao,Chisheng Deng,Shukang Deng,Jinsong Wang,Kaiyuan Shen
The environmentally friendly and sustainable characteristics of hydrogen generation through water electrolysis have drawn considerable interest. However, the inherently retarded reaction dynamics of the oxygen evolution reaction (OER) limit its efficiency. Consequently, advancing high-performance and cost-effective OER electrocatalysts significantly strengthen the water electrolysis’ performance. A composite nanostructured catalyst is successfully developed by integrating S-doped NiMoO 4 with NiFe-layered double hydroxides (LDH). Characterization results indicate that the NiMoO 4 -decorated NiFe-LDH increases catalytic efficiency by providing additional active sites, while the introduced S further enhances electrical conductivity. Electrochemical tests reveal that the OER capability of S-NiMoO 4 @NiFe-LDH under alkaline conditions is exceptional, achieving a negligible overpotential of 256 mV at 50 mA cm −2 and a minimal Tafel slope of 27.8 mV dec −1 , along with outstanding durability at 10 mA cm −2 (200 h). Furthermore, electrochemical probe experiments and mechanistic analyses reveal the possible potential reaction route of the catalyst during the OER, playing a crucial role in clarifying how the adsorbate evolution mechanism (AEM) and the lattice oxygen mechanism (LOM) synergistically enhance catalytic performance. This study affords a compelling strategy for establishing stable and efficient catalysts for electrochemical water oxidation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhiwei Zhao,Yuan Li,Yanjie Wang,Yating Wang,Yuhao Tang,Mengyue Lu,Xu Yang,Xiaoqing Wang,Feifei Zhang,Jinping Li,Jiangfeng Yang
The enrichment of low-concentration coal-bed methane is beneficial to solving the world’s energy concerns. However, most adsorbents used for CH 4 /N 2 separation from coal-bed methane are hydrophilic and ineffective under humid conditions. In this study, a hydrophobic nickel-based metal–organic framework (TUTQ-1Ni) was developed for efficient CH 4 /N 2 separation under humid conditions. Adsorption results show that, at 298 K and 1 bar, TUTQ-1Ni exhibits the highest CH 4 /N 2 selectivity (11.0) among the reported hydrophobic CH 4 -selective metal–organic frameworks. The results of theoretical calculations reveal that multiple O/S sites provide strong adsorption affinity for CH 4 over N 2 . Further, breakthrough experiments confirm the suitability of the material for CH 4 /N 2 separation, with the separation performance being maintained at even a high relative humidity of 100 %. The pressure swing adsorption simulation results indicate that TUTQ-1Ni is a potential candidate material for the selective capture of methane from coal-bed methane.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Na Xiao,Ping Han,Zhaoqi Chen,Qiuling Chen
Under the spotlight for their potential to reduce over-potential, photo-assisted Li–O 2 batteries still face a key challenge: the rapid recombination of photo-generated electron-hole pairs, which limits their efficiency. In this study, we address this limitation by designing a Li–O 2 battery that integrates both photo and magnetic field assistance, using an S-scheme MXene/In 2 S 3 /CoFe 2 O 4 heterojunction photocathode. This unique combination enhances visible light absorption and generates a strong built-in electric field, facilitating effective charge separation and boosting photocatalytic activity. During discharge, photo-generated electrons participate in the oxygen reduction reaction, while photo-induced holes contribute to the decomposition of discharge products during charging. Furthermore, the introduction of a magnetic field, confirmed through vibrating sample magnetometer, Mössbauer spectroscopy, X-ray absorption near edge structure, and cyclic voltammetry analyses, enhances electron-hole separation via Lorentz forces and spin–orbit coupling, accelerating the formation and decomposition of Li 2 O 2 . With this synergistic approach, the battery achieves a high specific capacity of 26,500 mAh g −1 , ultra-low oxygen reduction/evolution reaction over-potentials of 0.08 V/0.17 V, and a long cycle life of 2000 cycles with energy efficiency of 98.11 %. This work demonstrates the promising potential of combining photo and magnetic field effects to improve the electrochemical performance of Li–O 2 batteries, opening new avenues for high-performance energy storage systems.
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ENERGY & FUELS
·
2024
·
IF 5.2
Wang Ke,Shaobo Cai,Runlin Ma,Jingge Shi,Manman Wu,Menggai Jiao,Yongzheng Fang,Yiyang Liu,Zhen Zhou
With the increasing application of electric vehicles, the surging of lithium-ion batteries (LIBs) may foreshadow potential environmental disruptions stemming from mishandling spent LIBs and greenhouse gas emissions from recycling. Urgent advancements are needed in the current recycling technologies for dead LIBs. Herein, we propose a solution to address the challenge of industrial LIB waste recycling by repurposing it into environmentally friendly functional materials. Specifically, unitary and ternary transition metal organic frameworks (TT-MOFs) were successfully synthesized for use in the separator for high-performance lithium-sulfur (Li-S) batteries. The unique ternary MOFs demonstrate the capability to mitigate the shuttle effect and enhance the adsorption and conversion of lithium polysulfides during cycling. Notably, we achieved an initial discharge capacity of 1008.7 mA h g–1 at 0.5 C, with a decay rate of only 0.054% after 500 cycles. This research reuses waste solutions from the wet metallurgy process of LIB recycling and unveils a promising approach for the development of sustainable energy-storage materials in the future.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Jiangli Sun,Huizhong Wu,Chunhong Fu,Chaohui Zhang,Zhongzheng Hu,Minghua Zhou
A novel photoelectrocatalytic (PEC) system consisting of S-scheme MgO/g-C 3 N 4 photoanode and modified carbon felt (MCF) cathode was designed for efficient degradation of tetracycline , in which photoanode had both efficient photocatalytic performance and activation of H 2 O 2 produced by the MCF cathode. After 30 min of LED irradiation, the PEC system could completely remove tetracycline at cathodic bias of −0.5 V (vs. Ag/AgCl), and the degradation rate constants were 5.3 and 1.5 times that of electrocatalysis and photocatalysis . The charge transfer mechanism of S-scheme MgO/g-C 3 N 4 was verified by experimental studies and DFT calculations. Mg-N coordination was the key to activate H 2 O 2 to produce singlet oxygen ( 1 O 2 ) and hydroxyl radicals ( • OH). The PEC system had excellent degradation performance at pH ranges 4–10, which solved the bottleneck that Fenton system is effective at narrow pH range. This study provides new ideas for preparation of bifunctional photoanodes and new insights into the PEC process.
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