JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Shuzhi Liu,Min Yang,Yijiang Liu,Hongbiao Chen,Huaming Li
A new colorimetric fluorescent probe (MCy) for CN − is designed and synthesized based on triphenylimidazole-hemicyanine dyad. The probe shows high selectivity towards CN − in 100% aqueous solution even in the presence of other competitive anions such as F − , Cl − , AcO − , NO 2 − , H 2 PO 4 − , I − , SCN − , SO 4 2− , NO 3 − , HCO 3 − , Br − and S 2− . Upon nucleophilic addition of CN − to the indolium group, the probe displays large blue-shift in UV–vis spectrum and remarkable “turn-on” fluorescence owing to the disruption of intramolecular charge transfer. Meanwhile, the probe also undergoes a naked-eye discernible color change from orange to light pink in the sunlight as well as an obvious fluorescence color change from non-emissive to bright blue under a UV lamp. The detection limit of CN − in aqueous solution can be as low as 20.6 nM, which is much lower than the permissible level of CN − in drinking water according to the WHO. In addition, the probe has been successfully used to determine CN − in real water samples as well as to fabricate test paper kit for CN − detection.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
·
IF 4.7
Zhanzhen Ma,Qianjin Ye,Sirui Liu,Qunhua Zhong,Guisheng Zhu,Jianjun Zhu,Di Li,Deli Jiang
Designing S-scheme heterojunctions with high charge separation efficiency and strong photo-redox capability is regarded as effective way to enhance the photocatalytic activity, yet achieving S-scheme charge transfer remains challenging. In this work, we report the construction of a well-designed S-scheme heterojunction by integrating carbon vacancies-containing carbon nitride (V C -CN) and CsPbBr 3 quantum dots. Experimental studies and density functional theory (DFT) calculations demonstrate that the enlarged interfacial interaction induced by the V C within CN could achieve a directional S-scheme charge transfer, therefore improving photogenerated carrier separation capability and consequently promoting photocatalytic CO 2 reduction performance. The CO evolution rate over 5 % CsPbBr 3 /V C -CN S-scheme heterojunction is 84.39 μmol·g −1 ·h −1 , which is 16.26 times than that of CN. Our work offers an alternative strategy to construct S-scheme heterojunction photocatalytic for CO 2 reduction via modulating the internal electric filed achieved by defect engineering route.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Sirui Liu,Qianjin Ye,Qin Li,Zhanzhen Ma,Ran Yang,Di Li,Deli Jiang
Carbon nitride (CN) has received extensive interest due to their good stability and unique conjugated structures. However, the weak charge separation ability and poor active sites lead to undesirable photocatalytic CO 2 reduction activity. Here, we successfully prepare all-organic PTA/V C -CN S-scheme heterojunction photocatalysts by integrating CN with carbon vacancies (V C -CN) and perylene tetracarboxylic acid (PTA) for photocatalytic CO 2 reduction. The introduced carbon vacancies can act as electron trapping sites, break the symmetry structure of CN and facilitate in-plane photogenerated carrier separation and transfer of CN, while the coupling of PTA with V C -CN via π-π interaction to form a built-in electric field further speeds up the interfacial charge transfer, thereby collectively enhancing the separation and transfer efficiencies of photogenerated carriers. Moreover, the high reduction capability of V C -CN with carbon vacancies as possible active sites and wide-spectrum light absorption of PTA render the S-scheme heterojunction with high photocatalytic activity. The optimum PTA/V C -CN photocatalyst exhibits a high CO production rate of 47.91 μmol g −1 h −1 , which is about 10.7 and 4.2 times higher compared to those of CN and V C -CN, respectively. This work provides a new strategy for developing all-organic CN-based S-scheme heterojunction photocatalysts used in CO 2 conversion.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 3
·209
·
IF 5.4
Li Shaohui,Hao Sijia,Li Wen,Meng Ran,Wang Qiang,Wang Yuqing,Wang Lei,Liu Xinjing,Zhou Yuanyuan,Wang Haitong,Zhang Dongxia,Zhou Xibin
A ternary structure (CuO/CN/LDH) composed of LDH-anchored g-C 3 N 4 nanosheets loaded with CuO nanoparticles was successfully constructed via hydrothermal and co-precipitation methods, and a colorimetric sensing platform for hexavalent chromium (Cr(VI)) detection was proposed. The engineered nanomaterial demonstrates significantly enhanced oxidase-mimetic activity in the presence of Cr(VI), enabling rapid catalytic oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) with distinct chromogenic response. Mechanistic investigations reveal that Cr(VI) facilitates the conversion of dissolved oxygen into superoxide anions via redox cycling, thereby accelerating TMB oxidation. The sensor exhibits exceptional analytical performance with high accuracy (recoveries of 97.3-103.8%) and sensitivity (detection limit of 25 nM) in aqueous sample analysis. The sensor demonstrated excellent selectivity against common interfering metal ions, as well as high stability (still above 95% for 8 weeks). Notably, an innovative paper-based analytical device was developed in conjunction with smartphone-assisted colorimetric detection, achieving on-site visual quantification of Cr(VI) within 15 min. This integrated system provides a field-deployable solution for environmental monitoring, combining operational simplicity with reliable detection capabilities. This study addresses the main limitations of Cr(VI) sensors, such as their dependence on complex instruments and poor stability of natural enzymes, and demonstrates low detection limits, excellent selectivity, and long-term stability. In addition, the proposed methodology advances current sensing technologies by merging nanomaterial engineering with portable detection platforms, demonstrating significant potential for heavy metal surveillance in water quality management. Based on this, this study also constructed a paper-based colorimetric detection sensor.
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Science China-Materials
·
2023
·Vol. 66
·期 5
·1779-1792
·
IF 8.1
Yang Jia,Wang Mengxiao,Chen Tao,Yu Xiang,Qin Gang,Fang Xiaohan,Su Xiaoxiang,Chen Qiang
Supercapacitors exhibiting toughness, self-healing, and high specific capacitance have practical significance for use in flexible and wearable electronic equipment. To meet these requirements, a novel multifunctional gel polymer electrolyte (GPE) consisting of polyvinyl alcohol (PVA)-sodium alginate (SA)-K 3 [Fe(CN)] 6 -Na 2 SO 4 was prepared. In this GPE, K 3 [Fe(CN)] 6 plays three crucial roles by serving as a carrier donor, ionic crosslinking agent and redox-active mediator. Consequently, the usual conflict between the conductivity and mechanical properties of GPEs is alleviated to some extent. In addition, the electrode specific capacitance and the energy density of the assembled supercapacitor are obviously improved because of the pseudocapacitance generated from the redox reaction of K 3 [Fe(CN)] 6 . Based on this GPE, the supercapacitor exhibits outstanding bending and stretching stabilities, significant self-healing, and anti-freezing properties. Therefore, the prepared GPE and supercapacitor are promising for application in flexible and wearable electronic equipment with complex service conditions.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Ying Huang,Minhua Su,Ying Zhou,Diyun Chen,Zuopeng Xu,Hongguo Zhang,Changzhong Liao
In this research, well-crystallized lithium chloride (LiCl) intercalated graphite carbonitride (g-C 3 N 4 ) nanotubes (LiCl–CN) as ceramic films have been rationally designed and fabricated through the molten salt preparation. The as-synthetic material exhibited nanotube morphology and showed significantly enhanced photocatalytic performance on the degradation of bisphenol A (BPA) compared with g-C 3 N 4 in the presence of simulated solar light. The catalytic performance of LiCl–CN was remarkably improved due to the structural alteration of g-C 3 N 4 . The results demonstrated 100% BPA could be effectively removed with 0.3 g/L LiCl–CN at pH 5.0 in this investigated reactive system, and the degradation behavior was consistent with pseudo first order reaction kinetic model. Besides, LiCl–CN photocatalyst exhibited excellent photostability and recyclability for BPA photolysis. Mechanistic study revealed that both superoxide radicals (·O 2 - ) and photogenerated holes (h + ) were the dominant activated species for the degradation of BPA by LiCl–CN. The findings of this work further open an avenue for the application of g-C 3 N 4 based ceramics materials for organic pollutant removal from wastewater.
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Analytical Methods
·
2016
·Vol. 9
·期 2
·259-266
·
IF 1.915
Liyuan Qin,Lingjie Hou,Jia Feng,Jianbin Chao,Yu Wang,Wei Jun Jin
A new and simple julolidine based molecular receptor system L linked to 4-phenylsemicarbazide through an imine moiety has been synthesized and characterized. In HEPES-buffered MeOH–H2O (4 : 1, v/v, pH = 7.4) solution, L selectively binds Cu2+ to form a 1 : 1 ligand/metal complex, leading to a color change from green to yellow and significant fluorescence quenching at 540 nm. The in situ formed L–Cu2+ complex is further utilized to sense cyanide ions with high selectivity and fluorescence enhancement performance via metal displacement assay. The detection limit is 2.28 × 10−7 M and 1.33 × 10−8 M for Cu2+ and CN−, respectively. The sensor has been successfully applied to detect cyanide in water samples. The fluorescence imaging experiments in living cells were also demonstrated, which concludes that the sensor is capable of sensing Cu2+ and CN− in living cells.
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INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS
·
2024
·
IF 4.9
Xinyuan Peng,Qingtao Kong,Qian Wei,Shilin Guo,Qiying Chen,Min Peng,Binyi An,Xiaoyu Wang,Chen Zhang,Hong Sang
Currently, the therapeutic effect on cryptococcal infection patients is hindered by toxicity and drug resistance, making it urgent to discover alternative antifungals. Calcium channel blockers, verapamil (VER), have shown effective antifungal effects in several fungi. Here, we found that VER has a significant antifungal effect on Cryptococcus neoformans ( C. neoformans ). Furthermore, VER has significant synergistic effects with multiple antifungals, even caspofungin (CAS). We confirmed that VER and CAS had a synergistic antifungal effect in the Galleria mellonella . We conducted in-depth research on the possible mechanism of the synergistic impact of VER and CAS. After treatment with VER, the chitosan content of C. neoformans ' cell wall decreased and in dopamine liquid culture medium, we observed the leakage of melanin. Through cell wall fluorescence staining and stress sensitivity analysis, we further demonstrated that VER impaired the integrity of the C. neoformans ' cell wall. Another side, VER+CAS modification of C. neoformans membrane permeability, leading to intracellular ROS accumulation and mitochondrial membrane potential changes. VER eliminated the cytoplasmic calcium fluctuations caused by CAS stimulation and down-regulated the genes expression associated with the calcineurin pathway. In addition, we found that the enzyme activity of chitin deacetylase of C. neoformans is significantly influenced by the presence of Ca 2+ , suggesting that the use of VER may affect the activity. In summary, the synergistic antifungal effect of VER and CAS makes them effective and promising candidates for fungal treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 14
·1-17
·
IF 2.8
Liu Ti-Ying,Qu Xing-Hao,Shi Gui-Mei,Yu Di,Wang Xiao-Lei
Magnetic metal/carbon composites derived from metal–organic frameworks (MOFs) are viewed as promising candidates for high-performance microwave absorbers. Despite progress, a persistent challenge remains in expanding the effective absorption bandwidth (EAB) for microwave absorbers based on MOFs. To solve the above problems, in this work, NiFe@CN nanocomposite consisting of nickel–iron alloy nanoparticles (NiFe alloy NPs) embedded into nitrogen-doped carbon nanotubes (NCNTs) were fabricated utilizing a flexible two-step method, including co-precipitation and chemical vapor deposition, where the synthesized precursor NiFe Prussian blue analogs (NiFe-PBA) served as the self-sacrificed template and dicyandiamide (DCDA) served as carbon source. By tailoring the mass ratio of DCDA to NiFe-PBA, the morphology of synthesized NiFe@CN nanocomposites can be precisely controlled to create more tubular structures. These structure features enable NiFe@CN nanocomposites to acquire a synergistic effect of interfacial polarization, defect dipole polarization, conduction loss, eddy current loss, and magnetic resonance, which leads to enhanced dielectric loss, optimized impedance matching, and intense attenuation capability. As a result, the NiFe@CN nanocomposites exhibit excellent microwave absorption performance. At a thickness of 2.04 mm, the minimum reflection loss (RL min ) is − 54.09 dB at 13.41 GHz, and the EAB is 5.78 GHz. This work presents a novel strategy for designing low-cost, lightweight, and broadband frequencies microwave absorbers derived from bimetallic MOFs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 5
·1-9
·
IF 2.8
Zhang Xiaochen,Zhang Zijian,Zhang Xueqi,Sun Haiquan,Hu Quan,Wang Haibao
Shuttle-like vanadium selenide was prepared via carbonizing the vanadium-based metal organic frameworks for supercapacitors. Its morphology and structure were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and N 2 adsorption–desorption isotherm. Its electrochemical performance was investigated by cyclic voltammetry and galvanostatic charge–discharge test in three electrode configurations for supercapacitor. Compared with those in pure KOH electrolyte, the supercapacitive performances can be greatly enhanced when adding a certain amount of K 3 Fe(CN) 6 in KOH. A high specific capacitance of 512 F g −1 can be achieved at a scan rate of 0.2 mV −1 in 1 M KOH + 0.02 M K 3 Fe(CN) 6 , while only 164 F g −1 can be obtained in pure 1 KOH electrolyte. Furthermore, the VSe 2 also exhibits stable long-term cycling, 84.7% capacitance retention after 6500 cycles at a current density of 2 A g −1 . Those results provide a facile yet effective method for high performance energy storage devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Chen Liu,Huanxuan Li,Chen Xu,Zijie Shi,Xueheng Wei,Zhitong Yao,Shaodan Xu,Jingang Huang,Mingzhi Huang
The increasing complexity and concentration of refractory organic pollutants in industrial wastewater necessitate the development of efficient and stable advanced oxidation processes (AOPs). Herein, metal–organic framework (MOF)-derived Co₃Fe₇@CN carbon composites were successfully fabricated and evaluated as peroxymonosulfate (PMS) activators for the degradation of oxytetracycline (OTC). Among the as-prepared catalysts, Co₃Fe₇@CN-1 exhibited superior catalytic performance, achieving 90% OTC removal within 10 min with an apparent rate constant ( k obs ) of 0.158 min −1 , which represents a 1.7- and 1.5-fold enhancements over Co₃Fe₇@CN-2 and Co₃Fe₇@CN-3, respectively. The outstanding activity of Co₃Fe₇@CN-1 is primarily attributed to its favorable pore structure and pronounced adsorption–catalysis synergy. Specifically, Co₃Fe₇@CN-1 and Co₃Fe₇@CN-3 achieved 23% and 21% of OTC removal via adsorption, respectively, whereas the dense structure of Co₃Fe₇@CN-2 significantly impeded pollutant uptake (<5%). Mechanistic investigations revealed that PMS activation is driven by the synergistic redox cycling of Co (Co 0 /Co(II)/Co(III)) and Fe (Fe 0 /Fe(II)/Fe(III)) species. Electrons transferred from zero-valent and low-valent metals promote O O bond cleavage in PMS, triggering the generation of SO₄• − and •OH radicals. Crucially, the Fe species acts as an electron reservoir to accelerate the reduction of Co(III) to Co(II), thereby effectively circumventing the rate-limiting step of the Co redox cycle. Simultaneously, high-valent Fe(III)/Co(III) species interact with PMS to form high-valent metal-oxo intermediates ( Fe(IV) O and Co(IV) O), which serve as the predominant reactive species responsible for OTC degradation. The coexistence of radical and non-radical pathways ensures efficient OTC degradation. This work establishes a controllable strategy for constructing MOF-derived carbon catalysts and elucidates the structure–activity relationship between pore architectures and redox centers.
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Journal of Materials Chemistry A
·
2026
·
IF 9.5
Qing Cheng,Yuqi Zhang,Yingying Cao,Long Liu,Yanqiang Zhang
The novel ionic liquid-H2O2 propellants are urgently to solve the intrinsic ignition problem for achieving the aerospace applications. We addressed this issue by tuning the d-band center to adjust the catalyst's adsorption strength for IL/H2O2 toward the optimal value, thus enhancing catalytic activities for the efficient decomposition of H2O2 to generate reactive oxygen species. Herein, the regulation of the d-band center of Cu(I) in Cu(I)-MOF catalyst by precise ligand engineering design was studied. Remarkably, The Cu-S3 coordination of Cu-SH' shifts its d-band center closer to the Fermi level, promoting the adsorption of [BMIM]N(CN)2 and H2O2. Cu-SH' enables efficient H2O2 activation and robust •OH and 1 O2 generation to trigger the rapid self-ignition of [BMIM]N(CN)2-H2O2 propellant. The resulted tid as low as 18.4 ms is nearly 34% lower than that of homogeneous catalyst [FcCH2N(CH3)3]2[Cu2I4]. This work provides fundamental insights into the design of efficient ligand-based combustion catalysts for the higher performance of rockets and spacecrafts.
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