RSC Advances
·
2020
·Vol. 10
·期 33
·19149-19156
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IF 3.119
Liu Yang,Yu-Long Liu,Cheng-Guo Liu,Ying Fu,Fei Ye
A RhB@Zr-MOF composite with dual-emission properties was successfully constructed, which comprises a zirconium-based metal–organic framework and the luminescent dye molecule, Rhodamine B (RhB), embedded via the encapsulation method. The fluorescence intensity ratio of the two emissions was found to be ca. 370 nm/590 nm for RhB@Zr-MOF. The fluorescence intensity values of the two emissions of RhB@Zr-MOF can also be affected by the structures of analytes containing different organic groups. Due to the existence of the dual-emission properties in RhB@Zr-MOF, the relative fluorescence intensity of the emission peaks was introduced as a detection index instead of absolute fluorescence intensity. RhB@Zr-MOF, which possesses the characteristics of a built-in self-calibrating fluorescence sensor, was investigated for detecting cations, nitroaromatics and pesticides. Aside from high sensitivity and selectivity, recyclability is the most important property for sensing pesticides. This work shows that RhB@Zr-MOF can maintain its stability after 5 cycles of detecting nitenpyram, with LOD of 0.2 μM. These results demonstrate that dye@MOFs with dual-emission properties can be employed as multifunctional fluorescence sensors for different types of analytes, and that RhB@Zr-MOF provides a new paradigm for analyte sensing.
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PubMed
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5605-5625
·
IF 5.726
Yan Cui,Leilei Xu,Mindong Chen,Xinbo Lian,Cai-e Wu,Bo Yang,Zhichao Miao,Fagen Wang,Xun Hu
A series of mesoporous nanocrystalline Ce–Zr solid solutions with different Ce/Zr ratios were successfully synthesized by the evaporation-induced self-assembly strategy, and were employed as catalytic supports of CuO-based catalysts for CO oxidation. These supports and catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed desorption (CO2-TPD), etc. The catalytic performances toward CO oxidation had been carefully evaluated over these CuO-based catalysts. The effects of various influencing factors, such as the Ce/Zr ratio, mesostructure, redox properties of the support, CuO loading amount and calcination temperature, on the low-temperature catalytic activity had been carefully investigated. The results showed that the catalyst supported on the support with a Ce/Zr ratio of 80/20 exhibited the highest catalytic activity. It was also found that the Ce–Zr solid solution mesoporous catalysts exhibited much higher catalytic activity than the counterparts without evident mesostructure, demonstrating the advantages of the mesoporous catalysts by providing more accessible catalytically active sites. Besides, the mesoporous Ce–Zr solid solution-supported catalysts with excellent redox properties displayed much better catalytic performances than the commercial γ-Al2O3-supported catalyst. The kinetic study also indicated that the apparent activation energy of the CO oxidation process was greatly affected by the Ce/Zr ratio, mesostructure, and redox properties of the support. Overall, the present CuO-based catalysts with mesoporous nanocrystalline Ce–Zr solid solutions as supports were considered as a series of promising catalysts for CO oxidation.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Qi Liu,Xiaoming Cao,An Du,Ruina Ma,Xiaoran Zhang,Tingting Shi,Yongzhe Fan,Xue Zhao
In this paper, a chromate free conversion coating based on titanium/zirconium salts and aminotrimethylene phosphonic acid (ATMP) was prepared on 7A52 aluminum alloy. The morphology and composition of conversion coating were investigated by test measurements of SEM、EDS、XRD and FT-IR. The adhesion strength between aluminum matrix and subsequent epoxy primer was tested directly. The roughness and wettability of conversion coating were also detected to indirectly characterize the adhesion strength from another side. The electrochemical tests and neutral salt spray tests were also conducted to measure the corrosion resistance of the prepared conversion coating. Results reveal that a uniform and dense conversion coating consisted by metal oxides and other salts is obtained on the surface of 7A52 aluminum alloy. Significantly, the adhesion strength between matrix and epoxy primer increases from 7.97 MPa to 16.23 MPa, which dues to the increase of surface roughness and the improvement of wettability. In addition, the neutral salt spray test time of the conversion coating reaches as long as 120 h. Three orders of magnitudes decrease of current density proves the excellent corrosion resistance of conversion coating, which is also confirmed by electrochemical impedance spectroscopy test. This dues to the barrier property of conversion coating, preventing the corrosive solution to have a direct contact with aluminum matrix. Anyhow, both the adhesion strength and corrosion resistance are greatly reinforced by the existence of conversion coating.
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高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Haibo Ouyang,Guibiao Li,Cuiyan Li,Jianfeng Huang,Jie Fei,Jing Lu
C/C-Zr-Si-O composites were prepared by carbothermal reduction of hydrothermal co-deposited ZrO 2 , SiO 2 , and C. The bulk density of composites reached 1.71 g/cm 3 with 8 cycles of co-deposition. The matrix of the composites includes ZrC, SiC, ZrO 2 , and SiO 2 with fine grain size (300–500 nm) and homogeneous distribution. The mass and linear ablation rate of C/C-Zr-Si-O composites were 0.112 mg/cm 2 ·s and 0.46 μm/s, respectively, under a plasma flame for 120 s. The attractive ablation resistance of the composites resulted from its unique structure, which tends to form a continuous ZrO 2 -SiO 2 glass layer in the ablation center, a layer of SiO 2 -ZrO 2 bubbles in the transition region, and fluffy SiO 2 nanowires layer in the heat-affected region. These ablation layers were barriers to restrain the diffusion of oxidative gas and heat. The C/C-Zr-Si-O composites provide an alternative ceramics system with attractive ablation resistance, while carbothermal reduction of hydrothermal co-deposited oxides is a feasible method for the structural design of carbon fiber reinforced ultra-high temperature ceramic.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2014
·
IF 1.642
Renping Cao,Kangbin Chen,Qianglin Hu,Wensheng Li,Hui Ao,Chunyan Cao,Tao Liang
A series of Sr (1 − x − y − z ) MoO 4 : x Eu 3+ , y Bi 3+ , z R + (R + = Li + , Na + , and K + ) phosphors are prepared through solid-state reaction method in air. Eu 3+ doped SrMoO 4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and its emission intensity can be enhanced after co-doping Bi 3+ owing to energy transfer between Bi 3+ and Eu 3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi 3+ and Eu 3+ ions. The optimal composition in Eu 3+ and Bi 3+ co-doped SrMoO 4 phosphors is determined to be (Sr 0.92 Eu 0.05 Bi 0.03 )MoO 4 . The emission intensity of SrMoO 4 :Eu 3+ , Bi 3+ phosphor is found to be further improved by using Li + , Na + , and K + ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xue Men,Rong Li,Aiwen Su,Yanli Zhang,Lian-Xun Gao,Chengxin Wu,Hongbin Wang,Wenrong Yang,Pengfei Pang
Protein kinase A (PKA) plays a significant role in the regulation of biological activities by the phosphorylation of the specific proteins or substrate peptides. The highly sensitive and reusable electrochemical biosensor has been developed to detect PKA activity based on the specific coordination between Zr 4+ and phosphate group. In this strategy, the specially designed substrate peptide can be anchored on the surface of gold electrode by Au-S bond. In the presence of adenosine triphosphate (ATP) and PKA, the substrate peptide is phosphorylated. Due to the large surface area of MOF and rich Zr 4+ active sites, signal molecule Thionine (Thi) can be absorbed into the cavity of NH 2 -Zr-MOF by the electrostatic interaction to form NH 2 -Zr-MOF@Thi signal probe. The phosphorylated peptide is linked to NH 2 -Zr-MOF@Thi probe because of the strong coordination interaction between Zr 4+ and phosphate group. Therefore, the number of Thi close to the electrode surface is increased and the response signal experiences amplification, markedly enhancing the sensitivity of the detection of PKA activity, which provides an excellent electrochemical sensing platform for PKA activity detection. The response signal of the electrochemical biosensor is proportional to the logarithm of PKA concentration, ranging from 0.05 U mL −1 to 100 U mL −1 , and the limit of detection of this biosensor for PKA is 0.017 U mL −1 when the signal-to-noise ratio is 3. In particular, the proposed method can selectively distinguish the target from other interferents, and can be used to screen potential small molecule inhibitors and detect PKA activity in complex cell samples. Therefore, the developed electrochemical biosensor can be used as a new way for the determination of PKA activity and the screening of its inhibitors in the future.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Runqiang Zang,Yuan Liu,Yihang Wang,Lu Feng,Yuansheng Ge,Molin Qin,Yuwan Du,Jinliang Ning,Xiaowei Ma,Xincun Dou
Defect-engineering-involved metal-organic frameworks (MOFs) have been highly valued in many fields due to the enhanced porosity and abundant active sites, but how the systematic modulation on deficiency influencing fluorescent sensing performance is still in its infancy. Here, systematic defect-engineering of MOF-525 is used to modulate the exposure of zirconium (Zr) clusters and the sieving capability of inner channels, enabling precise fluorescent sensing of phosphoryl fluoride nerve agents with specific chemical activity and molecular dimensions. Controllable defects transformed the localized emission of porphyrin into ligand-metal charge transferring (LMCT) due to the gradual loss of the ligand molecules, which is interrupted upon the coordination of nerve agents, triggering a red turn-on fluorescence. Thus, the defective MOF-525 with 60% deficiency effectively discriminates the phosphoryl fluoride nerve agents (e.g., sarin, soman) from similar substances (e.g., tabun, venomous agent X) due to synergistic sieving effect of chemical activity and molecular dimension. It exhibits highly sensitive (0.96 n m /3.8 ppb), rapid (<1 s) response toward target nerve agents and is robust to the environmental interference from the acidic, humid and common fluorescent substances. This work enhances understanding of defect-engineering MOFs and the correpsonding luminescent behavior, paving a new avenue for sensing strategy of trace real nerve agent vapor.
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Laser & Photonics Reviews
·
2025
·
IF 10
Hui Peng,Wei Tian,Qilin Wei,Linghang Kong,Guang Dai,Jialong Zhao,Bingsuo Zou
Recently, Sb 3+ -activated 0D Zr(IV)-based metal halides have gained enormous attention for their unique optical properties. However, realizing efficient white emission and multiple reversible emissions in a single system remains a great challenge. Parallelly, the currently reported Sb 3+ -activated Zr(IV)-based organic metal halides are mainly through aimless regulation of the type of A-site organic cations, severely limiting their development. Herein, all-inorganic Cs 2 ZrCl 6 :Sb 3+ is employed as the conformational model, three different compounds of Sb 3+ -doped [18-crown-6@A] 2 ZrCl 6 (A = K, Rb, Cs) are developed via supramolecular assembly. All compounds show efficient tunable white emission with luminous efficiency of 91.28% for [18-crown-6@K] 2 ZrCl 6 :Sb 3+ , 84.84% for [18-crown-6@Rb] 2 ZrCl 6 :Sb 3+ , and 78.63% for [18-crown-6@Cs] 2 ZrCl 6 :Sb 3+ , which shall stem from Sb 3+ -induced multi-exciton emission in [SbCl 6 ] 3− octahedron. Particularly, the strong supramolecular interaction can enhance the structural rigidity and suppress nonradiative transitions, which is the dominated reason for [18-crown-6@A] 2 ZrCl 6 :Sb 3+ exhibits efficient emission. The component/excitation/temperature/moisture-dependent multiple reversible PL switching characteristics are observed in Sb 3+ -doped [18-crown-6@A] 2 ZrCl 6 , which allows to demonstrate their applications in advanced optical anti-counterfeiting and information encryption. Moreover, a single-component white light-emitting diode is also fabricated, which shows a high color rendering index of 96.1. Therefore, the work provides a feasible scheme for designing organic Zr(IV) halides with fascinating optical properties.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jiacheng Zhang,Xi Sun,Junhao Xin,Li Wang,Yong Fan,Jifu Zheng,Shenghai Li,Jianing Xu,Nanwen Li,Suobo Zhang
To address increasing climate deterioration, it is of great value to prepare highly permselective separation membranes for CO2 enrichment and separation. In this study, zirconium-based metal-organic frameworks (Zr-MOFs) containing defective structures (defected-UiO-66-NH2, D-UN) with a high volume yield (12 g L–1 in a single batch) were prepared at room temperature for the first time using a simple green-synthesis strategy. After the modification with pentafluorobenzaldehyde, the fluorine-containing D-UN (named F-g-UN) nanoparticles showed the characteristics of local and dense distribution of fluorine elements. Due to the optimized CO2 affinity and improved dispersion of fluorination modification, the prepared mixed-matrix membrane (MMM) F-g-UN@AO-PIM-1 achieved synergistic improvement in CO2 permeability and selectivity, exceeding the 2008 Robeson upper bound (CO2 664.1 Barrer and CO2/CH4 34.2) and the 2018 binary CO2/CH4 mixed-gas upper bound (CO2/CH4 28.7). The substantial cause was the introduction of fluorine species, verified by relevant experiments and mechanism analyses such as CO2 adsorption. This work proves the feasibility of using crystal defect engineering and post-treatment strategies to enhance separation functions and offers new insights into designing efficient and low-cost MMMs for gas separation, promoting their application in separation membranes including but not limited to gas separation.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bingbing Cui,Guodong Fu
Given that heterojunction engineering is an effective method for improving the separation efficiency of photoexcited electrons in WO 3 -based photochromic systems, a series of solid-state photochromic Zr/Ti-MOF@WO 3 heterojunctions prepared via a facile hydrothermal strategy, where Zr/Ti-MOF with photosensitivity and chemical stability was selected as template to load WO 3 . Zr/Ti-MOF@WO 3 heterojunctions were verified as nanoparticles filled with thin layer structure and WO 3 was diffused into the Zr/Ti-MOF planar. The appropriate conductive band energies facilitate the transport of photostimulated electrons from Zr/Ti-MOF to WO 3 , resulting in a fast photresponse in color changes (it only takes 1 s). In addition, a carrier for information storage and data dynamic encryption was developed on the basis of the photochromic Zr/Ti-MOF@WO 3 heterojunctions. This work presents a promising way to improve the electron/holes separation efficiency by constructing unique heterojunctions and further explore novel WO 3 -based photochromic systems and broaden their applications in rewritable media and data security.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Elia Gadallah,Mohamed N. Khalil,Sami Karam,Wael Ali,Jinchao Chen,Xiangmin Xu,Yuan Jing,Fang Li
Designing and fabricating ultrafiltration membranes that possess relatively high permeability while simultaneously maintaining high rejection and improved antifouling properties continues to be a challenge. In this study, we investigated the integration of novel melamine modified Zr-based metal organic frameworks (Zr-MOFs) with nanosheets of graphene oxide (GO) and sulfonated graphene oxide (SGO). These composite materials were synthesized using the solvothermal process and subsequently coated onto the PES membrane surface using the vacuum-assisted dip-coating method. The stability enhancement of the topmost MOF composite layer adhering to the membrane surface is attributed to hydrogen bonding, π-π stacking, and van der Waals interactions. These effects are augmented by the incorporation of polar functional groups such as hydroxyl, carboxyl, sulfonate, and amine groups. The optimized composite membranes incorporating MOFs exhibit enhanced performance, with a permeability of 80.2 L/m 2 h bar, achieving a bovine serum albumin (BSA) rejection of ≥97.8 % and a humic acid (HA) rejection of 98.9 %. Moreover, a flux recovery ratio (FRR) of 89.5 %. To investigate the interactions among the incorporated components, molecular dynamics (MD) simulations were employed in a computational study. The simulations validated hydrogen bond formation and reinforced prior studies, demonstrating the potential of Zr-MOF compositions as effective hydrophilic nanoparticles. The overall results indicate a substantial enhancement in membrane performance and underscore the high potential for practical applications.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Juan Chen,Tingting Guo,Hongyi Gao,Han Meng,Zhixin Zhang,Jie Li,Zhili Song,Xingyu Pei,Supakorn Boonyuen,Xiaowei Zhang,Yu Jiang,Jinzhang Tao
The application of mixed-linker strategies in the synthesis of metal-organic frameworks (MOFs) has garnered considerable interest owing to their potential as fluorescent sensors, attributed to their facile synthesis and incorporation of diverse functional ligands. In this study, we designed and synthesized a novel fluorescent Zr-based MOFs, denoted as MOF-808-NH 2 , through the post-synthetic modification of 2-amino terephthalic acid (BDC-NH 2 ) on coordinatively unsaturated Zr sites, thereby preserving the structural stability of the parent framework. The MOFs exhibited exceptional turn-on fluorescence in aqueous solutions containing fluoride ions (F − ). The interaction between the-NH 2 groups on MOF-808-NH 2 and F − facilitated the formation of hydrogen bonds, significantly enhancing the fluorescence emission intensity of BDC-NH 2 at 450 nm and inducing a blue shift in the fluorescence emission peak, enabling the specific recognition of F − even in the presence of various anionic interferences. Notably, MOF-808-NH 2 demonstrates an ultrafast response time (within 30 s), a high detection sensitivity with a limit of detection of 1.56 μM, and remarkable selectivity and anti-interference properties with pronounced fluorescence emission against a dark background. Furthermore, MOF-808-NH 2 retained outstanding thermal, mechanical, and chemical stabilities, underscoring its potential for practical applications in selective F − detection.
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