APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Kuan Wang,Yi Wang,Dan Wang,Yuan-Xiao Du,Xin-Peng Li,Zhen-Hong He,Huan Wang,Weitao Wang,Yang Yang,Zhao-Tie Liu
The exploration of cost-efficient, environmentally friendly, and high-efficacy photocatalysts for the enhanced selective photooxidation of cyclohexane to KA oil (cyclohexanone (CHA-one) and cyclohexanol (CHA-ol)) is a pivotal challenge in the industrial realm. Herein, the present study focuses on the synthesis of needle-like S-scheme heterojunction photocatalysts with oxygen vacancies, which are achieved by the needle growth integration of nano-sized Nb 2 O 5 particles onto the BiOCl nanosheets. Remarkably, the 40 % Nb 2 O 5 /BiOCl composites exhibited superior performance in the solvent-free photooxidation of cyclohexane at room-temperature and under atmospheric pressure. The production yield of KA oil was 180.3 μmol (CHA-one/CHA-ol molar ratio = 3.5), and exceptional selectivity towards KA oil, reaching up to 99.3 %. The enhanced photocatalytic efficiency in cyclohexane oxidation can be attributed to the unique S-scheme heterogeneous interfaces with specific nanoneedle morphology, which result in the enhanced photonic absorption, effective charge carrier separation, a high density of oxygen vacancies, and the exposure of the highly reactive (001) plane of BiOCl. The excellent interfacial charge separation and transfer pathways of S-scheme heterojunction are disclosed by the in-depth EPR analysis and DFT calculations. These insights highlight the significant potential of the needle-like Bi-based S-scheme heterojunction photocatalysts for the efficient photooxidation of saturated alkanes.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yang Yu,Lichao Xu,Kaiyuan Xu,Yan Li,Hao Chen,Dongxu Zhang,Yuanzi Chen,Yue Liu,Wenyue Qi
The construction of S-scheme heterojunctions has drawn widespread attention within the photocatalysis field due to their capacity for efficient separation of photogenerated carriers, leading to excellent photo-oxidation-reduction performance. Herein, a novel S-scheme loofah biochar/MoS 2 /g-C 3 N 4 (LB/MS/CN) heterojunction was successfully constructed by ultrasonication in 50 % ethyl alcohol and heat treatment in N 2 atmosphere. Degradation experiments showed that the 5 % LB/MS/CN ternary photocatalyst had optimal photocatalytic efficiency (96.4 %) for the degradation of rhodamine B (RhB), and the reaction rate (k) of this photocatalyst (0.05420 min −1 ) was 5.4 times that of unmodified CN (0.01001 min −1 ). Ultraviolet-visible diffuse reflectance spectra, Mott-Schottky, and free radical trapping experiments suggested that the photogenerated carriers in LB/MS/CN were transferred through the S-scheme structure. Consequently, the co-catalytic action of LB and the synergistic impact of the heterojunction structure between CN and MS led to a reduced photogenerated carrier recombination rate. Furthermore, LB/MS/CN had outstanding stability and the capacity to maintain RhB degradation performance under various environmental conditions (H 2 PO 4 − , NO 3 − , SO 4 2− , HCO 3 − , NaCl, humic acid (HA), and real water), showing good promise for practical applications. Thus, this work provides a possible strategy for purifying wastewater under visible light.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 4
·2857-2864
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IF 3.201
Chunxi Zhao,Yang Jiao,Lei Zhang,Yaling Yang
Herein, we report a fast and selective technique for the determination of diethylstilbestrol in milk sample using fluorescent sulfur and boron co-doped carbon dots (S,B co-doped CDs). The S,B co-doped CDs were synthesized by hydrothermal synthesis using poly(sodium-p-styrenesulfonate) and borax as precursors. The as-prepared S,B co-doped CDs possess good stability and fluorescence characteristics and exhibit a fluorescence quantum yield of 25.7%. The fluorescence intensity of the S,B co-doped CDs decreased in the presence of diethylstilbestrol, and a good linear relationship existed between the fluorescence quenching and different concentrations of diethylstilbestrol in the range of 0.1–200 μM with a detection limit of 0.06 μM. Finally, the S,B co-doped CDs were successfully applied in the detection of diethylstilbestrol in milk samples, yielding recoveries between 90.4% and 109.2%.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 13
·1706513
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IF 13.325
Xuyan Ni,Tao Qian,Xuejun Liu,Na Xu,Jie Liu,Chenglin Yan
The “shuttle effect” that stems from the dissolution of polysulfides is the most fatal issue affecting the cycle life of lithium-sulfur (Li–S) batteries. In order to suppress the “shuttle effect,” a new strategy of using a highly lithium ion conductive lithium fluoride/graphene oxide (LiF/GO) solid electrolyte interphase (SEI) to mechanically prevent the lithium dendrite breakthrough is reported. When utilized in Li–S batteries, the LiF/GO SEI coated separator demonstrates significant feature in mitigating the polysulfide shuttling as observed by in situ UV–vis spectroscopy. Moreover, the restrained “shuttle effect” can also be confirmed by analysis of electrochemical impedance spectroscopy and characterization of lithium dendrites, which indicates that no insulating layer of solid Li 2 S 2 /Li 2 S is found on lithium anode surface. Furthermore, the LiF/GO SEI layer puts out good lithium ion conductivity as its lithium ion diffusion coefficient reaches a high value of 1.5 × 10 −7 cm 2 s −1 . These features enable a remarkable cyclic property of 0.043% of capacity decay per cycle during 400 cycles.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xiao-Fei Wang,Gui-Gen Wang,Jia-Bing Li,Zheng Liu,Wen-Feng Zhao,Jie-Cai Han
In this article, a new application of using S, N co-doped graphene quantum dots (S, N-GQDs) as ideal color converters in solid-state white light-emitting diode (WLED) is reported. To this end, the S, N-GQDs with an average diameter of ∼4.46 nm are obtained by a hydrothermal approach using citric acid and thiourea as source materials. The PL spectra of S, N-GQDs show an excitation-independent behavior in the range of 300–380 nm. Under UV illumination, the S, N-GQDs display intense blue-light with the quantum yield of 51.2%. The PL mechanism is also investigated. Then, we fabricate freestanding luminescent composite films in a solution casting method by combining S, N-GQDs with YAG:Ce 3+ phosphors based on a polyvinyl alcohol (PVA) matrix. The luminescent films have superior foldability and photostability and excellent heat resistance, and retain their optical performances in the solid-state. To realize their potential, a high-powered remote WLED has been demonstrated. The results indicate that S, N-GQDs and YAG:Ce 3+ can be homogeneously dispersed in the PVA without aggregation so that uniform white-light emission can be obtained. These composite films containing S, N-GQDs are promising to be used in state-of-the-art UV-pumped remote WLED according to their wide wavelength emission and collapsible illumination device.
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Journal of Energy Chemistry
·
2024
·
IF 14
Yangyang Chen,Yu Liao,Ying Wu,Lei Li,Zhen Zhang,Sha Luo,Yiqiang Wu,Yan Qing
Lithium-sulfur batteries (LSBs) are considered promising candidates for next-generation battery technologies owing to their outstanding theoretical energy density and cost-effectiveness. However, the low conductivity and polysulfide shuttling effect of S cathodes severely hamper the practical performance of LSBs . Herein, in situ-generated single layer MXene nanosheet/hierarchical porous carbonized wood fiber (MX/PCWF) composites are prepared via a nonhazardous eutectic activation strategy coupled with pyrolysis-induced gas diffusion. The unique architecture, wherein single layer MXene nanosheets are constructed on carbonized wood fiber walls, ensures rapid polysulfide conversion and continuous electron transfer for redox reactions. The C–Ti–C bonds formed between MXene and PCWF can considerably expedite the conversion of polysulfides, effectively suppressing the shuttle effect. An impressive capacity of 1301.1 mA h g −1 at 0.5 C accompanied by remarkable stability is attained with the MX/PCWF host, as evidenced by the capacity maintenance of 722.6 mA h g −1 after 500 cycles. Notably, the MX/PCWF/S cathode can still deliver a high capacity of 886.8 mA h g −1 at a high S loading of 5.6 mg cm −2 . The construction of two-dimensional MXenes on natural wood fiber walls offers a competitive edge over S-based cathode materials and demonstrates a novel strategy for developing high-performance batteries.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhihao Zhang,Jing Wang,Huidi Zhang,Yao Deng,Binbin Tan,Jiang Wang,Ting Yang,Wenlei Wang
The strategy of constructing edge sulfur vacancies at cellulose surface interfaces has attracted widespread interest in fields such as electronics, photonics, optoelectronics, electrocatalysis, environmental remediation, and biosensing. In this study, NiCo 2 S 4 (NCS) was modified onto cellulose sulfide nanocrystals (SCNC) with chiral helical structures. Utilizing high energy β Particle bombardment on the surface of photocatalysts induces the generation of edge S vacancies in SCNC, while promoting the formation of heterometallic single-atom clusters (Co n , Ni n ) in NCS. The edge sulfur vacancies on the surface of SCNC exhibit high reactivity and adsorption capacity. The aggregation of Co and Ni at this position can transfer photo generated electrons to the edge sulfur vacancies, thereby protecting the edge sulfur vacancies and prolonging the carrier lifetime. Electrons enriched in edge S vacancies can activate the O–O bond of PMS, thereby achieving efficient degradation of ciprofloxacin (CIP). The degradation kinetics constant of Co n -Ni n /NCS/SCNC-S v /PMS is 1.69 times higher than that of NCS/SCNC/PMS. In addition, electron paramagnetic resonance (EPR) shows that the sample produces a large amount of 1 O 2 during photocatalysis This article constructs a new approach for protecting edge S vacancies with heterogeneous single atom clusters, providing a new perspective for achieving efficient photocatalytic degradation of CIP.
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LANGMUIR
·
2024
·
IF 3.7
Jiani Xu,Zhongyi He,Liping Xiong,Yinglei Wu,Lei Guo,Lili Li,Renhui Zhang
A high yield of environmentally friendly N,S-codoped (N,S-CDs) and N-doping carbon points (N-CDs) carbon dots was achieved through a biochemical oxidation reaction at room temperature in this study. Acetaldehyde, sodium hydroxide, benzotriazole (BTA), and 2-mercaptobenzimidazole (MB) with a similar structure were used as raw materials. The microstructure and properties of the corrosion inhibitor for Q235 steel were evaluated by various experiments. The results demonstrated enhanced corrosion inhibition rates of the N,S-CDs compared to the N-CDs using electrochemical tests (93.83% vs 77.65%) and weight loss experiments (96.35% vs 91.65%) at 50 mg/L, respectively, compared to the blank material, indicating that N,S codoping can significantly improve the corrosion inhibition effect of carbon dots. The significant improvements were attributed to the formation of dense adsorption films and the hydrophobic properties of N and S-CDs nanoparticles on the steel surface, leading to an effective barrier against corrosion. The findings from this study provide important experimental data for potential industrial applications and hold important practical value in the field of pickling corrosion inhibitors.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Yuanyuan Yang,Tingting Luo,Min He,Jie Yu,Xiao Wu,Mingze An,Ting Lei,Qingqing Qin,Shuhao Qin
The non-homogeneous photocatalysis-self-Fenton technology represents a highly effective strategy for the degradation of pollutants. However, conventional catalysts are hindered by limitations such as restricted light absorption and challenges in separation. In this study, BaFe12O19 (BFO) was combined with iron-carbon dots modified resorcinol-formaldehyde (FRF) to construct an S-scheme heterojunction (BFR), which was subsequently incorporated into a cross-linked polyacrylic acid-base hydrogel (PAM) matrix to fabricate a floating composite gel catalyst. Under visible light irradiation, this catalyst achieved complete degradation of 20 mg/L chloroquine phosphate within 30 minutes, exhibiting a reaction rate constant 10 times greater than that of the BFR powder catalyst. The rate of in-situ generated H2O2 (30.05 mmol g−1 h−1) also increased by 11 times, that promoting the production of hydroxyl radicals (•OH). This significant improvement can be attributed to enhanced adsorption capacity of PAM hydrogel (124.2 mg g-1), superior near-infrared absorption, and photothermal effects of BFR heterojunction. The underlying mechanisms, including the formation of internal electric fields between FRF and BFO and the construction of the S-scheme heterojunction, were elucidated using in situ XPS and Kelvin probe force microscopy. Additionally, the analysis of reactive species, with potential degradation pathways for chloroquine phosphate (CQ), while toxicity assessments of the degradation products were conducted. This design of a floating photocatalyst provides an innovative approach to the development of efficient and recyclable photo-self-Fenton systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ping Tan,Zhen Mao,Yuhan Li,Jiayuan Yu,Liangjun Long
The construction of CN/UiO-67 (CNU) S-scheme heterojunction composites through in situ formation of UiO-67 on carbon nitride (C 3 N 4 ) helps to address the limitations of carbon nitride (CN) in photocatalytic NO elimination. The optimized CNU 3 demonstrates superior photocatalytic efficiency, which is attributed to electronic channels constructed by Zr-N bonds and S-scheme electron transport mechanism, effectively promoting the efficient separation of photogenerated charge carriers with high redox potentials. Density Functional Theory (DFT) calculations reveal redistributed electronic orbitals in CNU 3 , with progressive and continuous energy levels near the Fermi level, which bolsters electronic conduction. Comprehensive quenching experiments, Electron Paramagnetic Resonance (EPR), and in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analyses highlight a synergistic interplay of electrons, holes, and superoxide radicals in CNU 3 , inhibiting the generation of toxic nitrogen oxide intermediates and culminating in highly efficient photocatalytic NO oxidation. This study not only elucidates the mechanisms underpinning the enhanced performance of CNU 3 heterojunctions but also offers new perspectives on the preparation and interfacial charge separation of heterojunction photocatalysts.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Rourou Zhang,An Ding,Xuejun Cai,Peter Desmond,Xu He,Guibai Li,Heng Liang,Chuyang Y. Tang
The fluctuation of pathogen removal in ultrafiltration (UF) systems and its dependence on irreversible fouling necessitates frequent chemical cleaning/disinfection, raising concerns about leakage of conditioned pathogens. An additional barrier utilizing carbon materials with notable adsorption and antimicrobial properties offers a promising and practical solution. This study achieved complete retention of nano-sized viruses (∼6 log reduction value (LRV)) and micron-sized bacteria (∼7 LRV) by introducing ε-polylysine (EPL)-modified biochar (BC) into UF feeds. During the UF process, biochar with superior adsorption capacities and conformational flexibility, significantly enhanced the entrapments of natural organic matter (NOM), viruses, and bacteria. Specially, EPL exhibited conformational transitions that adapted to different NOM (macromolecule proteins and linear polysaccharides), greatly facilitating the formation of reversible biochar-NOM cake layers and the transfer of pathogens from the irreversible fouling layer to the biochar surface and reversible fouling layer. The random coil structures of EPL promoted electrostatic attraction for virus particles, while bend or sheet-like structures created barriers for both bacteria and viruses through a refined NOM-biochar network. The trapping of viruses was attributed to the combined effects of electrostatic attraction, bonding forces, and the complex cake layers. And size exclusion by the biochar-NOM complex fouling layer played a prominent role in the retention of bacteria. This breakthrough in addressing the trade-off between irreversible fouling and pathogen removal inspires promising applications of EPL-modified biochar for UF systems to consolidate barriers for water and process biosafety. Future efforts should focus on EPL′s conformational response to protein-like NOM with significant steric hindrance, which pose challenges for fouling alleviation and bacteria capture.
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POLYMER
·
2011
·
IF 3.829
Youmei Bao,Jing He,Yuesheng Li
A series of novel hydroxyl- or methyl ester- terminated hyperbranched poly(ester-amide)s (HBPEAs) based on acidic ( l -glumatic acid and l -aspartic acid) and basic amino acids ( l -lysine) have been synthesized via the “AD + CBB′” couple-monomer approach. The ABB′ intermediates were stoichiometrically formed through thio-ene reaction benefited from reactivity differences between functional groups. Without any purification, in situ self-polycondensations of the intermediates at elevated temperature in the presence of Ti(OBu) 4 , as a catalyst, afforded HBPEAs with high molecular weights . More rapid polymerization rate and much higher molecular weight as well as broader polydispersity were observed for the polymerization process of intermediates based on acidic amino acids than basic amino acids which is related to the catalytic mechanism and structure difference of intermediates. Moreover, polymerization of intermediate derived from l -aspartic acid was carried out faster by comparison with that from l -glumatic acid. The DB values were approximately estimated to be 47%–49% for the polymers derived from l -aspartic acid and l -glutamic acid. The resultant HBPEAs possessed glass transition temperature ( T g ) in the range of −3 to 11 °C, among which those derived from l -lysine shows the highest T g , and decomposition temperatures at 10% weight loss under air and nitrogen are in close regions of 261–271 °C and 264–268 °C, respectively.
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