CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
Pengfei Zhu,Xiaohe Yin,Xinhua Gao,Guohui Dong,Jingkun Xu,Chuanyi Wang
The controlled introduction of oxygen vacancies (OVs) in photocatalysts has been demonstrated to be an efficient approach for improving the separation of photogenerated charge carriers, and thus, for enhancing the photocatalytic performance of photocatalysts. In this study, a two-step calcination method where ZIF-8 was used as the precursor was explored for the synthesis of ZIF-8-derived ZnO nanoparticles with gradient distribution of OVs. Electron paramagnetic resonance measurements indicated that the concentration of OVs in the samples depended on the temperature treatment process. Ultraviolet–visible spectra supported that the two-step calcined samples presented excellent light-harvesting ability in the ultraviolet-to-visible light range. Moreover, it was determined that the two-step calcined samples presented superior photocatalytic performance for the removal of NO , and inhibited the generation of NO 2 . These properties could be attributed to the contribution of the OVs present in the two-step calcined samples to their photocatalytic performance. The electrons confined by the OVs could be transferred to O 2 to generate superoxide radicals, which could oxidize NO to the final product, nitrate. In particular, the NO removal efficiency of Z 350-400 (which was a sample first calcined at 350 °C for 2 h, then at 400 °C for 1 h) was 1.5 and 4.6 times higher than that of Z 400 (which was one-step directly calcined at 400 °C) and commercial ZnO, respectively. These findings suggested that OV-containing metal oxides that derived from metal-organic framework materials hold great promise as highly efficient photocatalysts for the removal of NO.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Hongbin Li,Hengji Liu,Wenying Shi,Haixia Zhang,Rong Zhou,Xiaohong Qin
Mixed matrix membranes (MMMs) combine the advantages of different materials and hopefully break through the limitation of high mass transfer resistance and low permeability in membrane distillation (MD) process. In this study, hydrophobic zeolitic imidazolate framework-71 (ZIF-71)/polyvinylidene fluoride (PVDF) hollow fiber composite membrane was prepared by the dilute solution coating method. ZIF-71 was incorporated into the PVDF dilute solution and a macroporous hydrophobic ZIF-71/PVDF coating layer was formed on the outer surface of PVDF hollow fiber support membrane through the nonsolvent induced phase separation (NIPS) process. PVDF hollow fiber support membrane was fabricated by the dry-jet wet spinning process. Membrane surface morphologies were observed through Field emission scanning electron microscope (FESEM). The effects of zeolitic imidazolate frameworks (ZIFs) content in PVDF coating layer on membrane surface hydrophobicity and desalination performance were investigated through Dynamic water contact angle (WCA) measurements and the vacuum membrane distillation (VMD) experiment, respectively. The VMD experiment was carried out at feed temperature 50 °C and permeation side vacuum 31.3 kPa using 3.5 wt% NaCl aqueous solution as the feed solution. Compared with the uncoated PVDF hollow fiber membrane, both the surface hydrophobicity and the water permeability of the ZIFs-incorporated PVDF hollow fiber composite membranes are improved. The surface WCA and permeation water flux of ZIFs-PVDF composite membrane increase from 94.5 to 136.5° and 13.5 to 27.1 kg . m −2. h −1 meanwhile the NaCl rejection could maintain at 99.99%. No obvious pore wetting phenomenon was observed for ZIFs-PVDF hollow fiber composite membrane during the continuous VMD experiment for 60 h. The dilute solution coating is a promising method to prepare high-performance hollow fiber composite membrane for the desalination in MD process.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Boya Qiu,Senqing Fan,Yilin Wang,Jiaojiao Chen,Zeyi Xiao,Yuyang Wang,Yu Chen,Jingyun Liu,Yangmei Qin,Shizhao Jian
A novel catalytic membrane micro-reactor (CMMR) is assembled with ZIF-8 in situ immobilized in polyethersulfone (PES) membrane pores. In this structure, ZIF-8 is evenly distributed on pore walls throughout membrane thickness. The size of ZIF-8 particles is lower than 50 nm. Loading of ZIF-8 can be achieved in the range of 10–180%. This CMMR exhibits high catalytic performance during the Knoevenagel reaction of Benzaldehyde and Ethyl cyanoacetate. The apparent reaction rate constant can be increased by 140.9% at 20 °C, catalyzed by the CMMR than that by ZIF-8 powders under batch catalysis mode. The apparent reaction rate constant can be increased further by 35.9%, with the value being 0.072 ± 0.006 min −1 , if plug-flow reaction mode is adopted. High catalytic stability can be achieved, and this CMMR can be recycled and reused over 10 repeating cycles and 300 min without significant decrease in the conversion rate. The conversion rate is 99.5 ± 0.2% at 80 °C, with loading of ZIF-8 being 85% and the membrane flux being 960 mL m −2 h −1 . Increasing loading of ZIF-8 and temperature can both improve the conversion rate and the apparent reaction rate constant. The apparent activation energy is halved catalyzed by the CMMR than that by ZIF-8 powders.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Jianmei Gao,Hu Meng,Qi Hu,Junyu Chang,Liang Feng
Semiconductor metal oxide (SMO)-based GC detector was investigated by rational design of 2D materials used as detector sensing film, which was verified to be a feasible way to overcome tailing and peak spreading phenomena usually existed in SMOs-based GC detector. Specifically, 2D flake-like ZnO chosen as an example was successfully synthesized by employing 2D ZIF-8 as template, and then acted as detector in portable gas chromatograph. The properties of detector were evaluated via detection of alcohols and other oxygen-containing VOCs. The results exhibited good linear dependence between peak heights and concentrations of target gases with a short response and recovery time (several seconds) and a high sensitivity, low detection limit (ppb level), together with prominent selectivity for oxygen-containing VOCs than hydrocarbons. Moreover, tailing and peak spreading phenomena mentioned above were hardly observed due to a smaller diffusion barrier for 2D material as compared to 3D counter parts. It is concluded that 2D materials-based portable GC detectors indeed possess great potential in practical application in the future.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yifei Zhan,Jianwu Lan,Jiaojiao Shang,Lin Yang,Xinmei Guan,Wenxu Li,Siqi Chen,Ying Qi,Shaojian Lin
A ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat was successfully fabricated via stepwise in-situ growth method. The morphology and composition of the resultant ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat were confirmed by emission scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS) and electrochemical impedance spectroscopy (EIS), respectively. Next, methylene blue (MB) was employed as a contaminant to evaluate photocatalytic activity of prepared composite photocatalysts under visible light and natural sunlight irradiation. As expected, the ZIF-8/Ag/AgCl/TiO 2 decorated PAN nanofibrous mat exhibited high photocatalytic activity under both light sources, owing to the synergistic effect among ZIF-8, Ag/AgCl and TiO 2 . The degradation efficiency of the targeted PAN nanofibrous mat under visible light could reach to 98.02% within 120 min towards 20 mL of 50 mg/L MB aqueous solution. Most importantly, the fabricated ZIF-8/Ag/AgCl/TiO 2 modified PAN nanofibrous mat exhibited outstanding recyclability, the corresponding degradation efficiencies were up to 90.16% after five cycles and approximately 80% after ten cycles, respectively. Additionally, the resultant nanofibrous mat showed a long-term stability against acid and alkaline, and excellent antimicrobial performance against S. aureus and E. coli .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
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IF 6.393
Jiahao Wu,Chao Yu,Yujie Yu,Jun Chen,Chengli Zhang,Rufei Gao,Xinyi Mu,Yanqing Geng,Junlin He
A novel dual-mode aptasensor was fabricated for ultra-sensitive detection of microcystin-LR (MC-LR). The direct method was developed using chronoamperometry for quick detection. A glass carbon electrode (GCE) was first modified with MoS 2 -PtPd nanoparticles (NPs). MoS 2 -PtPd was used as a substrate for a higher loading of aptamers and to amplify the signal by catalytic activity toward H 2 O 2 . The aptamer was then assembled onto the modified electrode surface to work as a recognition probe to bind MC-LR. To increase the sensitivity of the aptasensor, we developed an indirect method for ultra-sensitive detection through synthesizing and utilizing novel zeolitic imidazolate framework (ZIF)-8-thionine (Thi)-Au as signal material for the first time. This signal material not only possessed the high conductivity of Au NPs, but also produced current signal from a redox reaction by Thi . The complementary strand of the aptamer was immobilized on the surface of ZIF-8-Thi-Au and their compounds hybridized with the aptamer on the MoS 2 -PtPd modified GCE. MC-LR would replace ZIF-8-Thi-Au compounds by competition binding with the aptamer. The electrical signal would decrease then and be detected by SWV. Under optimal conditions, the linear ranges of the indirect and direct methods were respectively 0.01–50 and 0.1–50 ng mL −1 . And LOD of the indirect and direct method were respectively 0.006 and 0.045 ng mL −1 (signal-to-noise ratio = 3). The aptasensor ensured the accuracy of the detection outcome through comparing the results of the two modes and provided a potentially reliable and ultra-sensitive detection method of MC-LR in water environments.
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MOLECULES
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2022
·Vol. 27
·期 20
·6857
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IF 4.927
Min Shi,Guanwei Peng,Shuya Xue,Jingkun Xu,Yansha Gao,Shuwu Liu,Xuemin Duan,Limin Lu
In this work, a two-dimensional leaf-like framework-L embedded electrochemically reduced graphene oxide (ERGO@ZIF-L) was proposed as an outstanding electrode material for the sensitive electrochemical sensing of benomyl (BM). ZIF-L is surrounded by ERGO, which could effectively ensure the stability and dispersion of ZIF-L. With this unique combination, the prepared ERGO@ZIF-L displayed excellent synergistic characteristics with a large surface area, excellent conductivity, plentiful active sites, and high electrocatalytic properties, thus endowing it with high sensitivity for BM determination. The experimental parameters, such as solution pH, material volume, and accumulation time, were optimized. Under optimal conditions, the BM sensor showed a wide linear range (0.009–10.0 μM) and low-limit detection (3.0 nM). Moreover, the sensor displayed excellent stability, repeatability, and reproducibility, and good anti-interference capability. The method was successfully applied to detect BM in real-world samples.Keywords:two-dimensional MOFs;zeolitic imidazolate framework;ERGO;benomyl;electrocatalysts;electrochemical sensor
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FOOD CHEMISTRY
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2022
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IF 9.231
Qian Wang,Chengyi Xiong,Jingwen Li,Qianchun Deng,Xiuhua Zhang,Shengfu Wang,Miao-Miao Chen
Aflatoxin B1 (AFB1) that is prone to contaminate corns brings a serious threat to human health. Therefore, it is of great significance to construct novel detection methods for AFB1 tracing. Here, methylamine perovskite quantum dots (MP QDs) encapsulated by ZIF-8 metal–organic frameworks (MP QDs@ZIF-8) were prepared and then ultra-stable electrochemiluminescence (ECL) sensors were developed. By the confinement of cavities structure, multiple MP QDs were crystallized and embedded inside ZIF-8 to form MP QDs@ZIF-8, achieving stable and robust ECL responds in aqueous environment. Further combined with AFB1-imprinted polymer, the constructed ECL sensor showed good selectivity and ultra-sensitivity (the detection limit was 3.5 fg/mL, S/N = 3) with a wide linear range from 11.55 fg/mL to 20 ng/mL for AFB1 quantification. Satisfactory recoveries in corn samples indicated the reliable practicability of the proposed sensor for AFB1 assay. This work provided a novel pathway in designing high-performance ECL sensing platform for food safety.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yihan Wu,Biyun Li,Xiangxue Wang,Shujun Yu,Hongwei Pang,Yue Liu,Xiaoyan Liu,Xiangke Wang
The water stable core-shell microspheres (Fe 3 O 4 @ZIF-8) with strong magnetism were successfully fabricated through a facile modification strategy. Concrete procedures included firstly pretreatment of Fe 3 O 4 core with anionic polyelectrolyte to acquire negatively charged Fe 3 O 4 particle surface, followed by nucleation through attracting Zn 2+ cation, and then growth of a thin layer of ZIF-8 (~25 nm). Various characterization techniques (SEM, TEM, FT-IR, XRD, VSM, BET and XPS) indicated that the Fe 3 O 4 @ZIF-8 microspheres were highly stable and magnetic with a large specific surface area (606.91 m 2 /g) and fairly sufficient functional groups ( NH , OH, COOH, Zn O, N O and C N ). Multi-factors affecting the radionuclides removal performance on Fe 3 O 4 @ZIF-8 was adequately explored, comprising contact time, temperature, pH, ionic strength, co-existing ions and extreme conditions. And the results showed that Fe 3 O 4 @ZIF-8 exhibited fast reaction kinetics (~30 min to achieve equilibrium), excellent uptake capabilities (539.7 mg U/g and 255.6 mg Eu/g), remarkable selectivity and favorable physicochemical stability. These researches suggested that Fe 3 O 4 @ZIF-8 could not only simultaneously achieve favorable stability and functionality, but also easily to be separated by external magnetic field after used in radioactive sewage treatment, which was of considerable practical utility in extracting radioactive wastes though in harsh circumstance.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
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IF 6
Yiqiong Yang,Borui Jie,Yixuan Zhai,Yijie Zeng,Jingyan Kang,Geng Cheng,Xiaodong Zhang
Due to the uncontrolled synthesis of layered double hydroxides (LDHs), a simple and efficient strategy was needed to construct high-performance LDHs. Herein, Co-Mn-ZIF was used as the sacrificial template to form cobalt-manganese-nickel LDH (M−Co−Mn−Ni LDH) through the process of deconstruction and reconstruction. Due to the sufficient in-situ etching of the Co-Mn-ZIF template, M−Co−Mn−Ni LDH exhibited a larger specific surface area (482.4 m 2 /g) and pore volume (3.3 × 10 −2 cm 3 /g) as well as easier diffusion and interaction with reaction sites of organic molecules. The prepared M−Co−Mn−Ni LDH showed high catalytic performance for the degradation of enrofloxacin (ENR) by activating peroxymonosulfate (PMS), with the removal rate of 88.5 % within 30 min. The quenching reaction and electron paramagnetic resonance (EPR) analysis results indicated that SO 4 •− and 1 O 2 were main active substances in the oxidation process of ENR. In addition, the Co-Mn-Ni LDH/PMS system was stable and almost unaffected by pH values, organic and inorganic substances, and it could achieve high removal efficiency in various pollutant samples. This work provided a convenient and efficient approach for the construction of high-performance MOFs derived LDHs catalysts.
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Molecular Systems Design & Engineering
·
2023
·Vol. 9
·期 2
·205-213
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IF 3.6
Chao Li,Fengchuan Guo,Zongxin Li,Naipu He,Wen Li,Xuerui Zhao
A chitosan/ZIF-8 hydrogel (CGsZx) was fabricated by in situ nucleation and growth of ZIF-8 crystals with a tunable morphology in chitosan hydrogel (CG) networks, and used as an ideal adsorbent for CO2. The CG has heterogeneous nucleation sites and was then soaked sequentially in a methanolic solution of Zn(NO3)2·6H2O and then a methanolic solution of 2-methylimidazole (2MeIM), and then combined with Zn2+ by forming a Zn–N coordination bond, and then the ZIF-8 crystals were formed on the CG. The growth and distribution of the ZIF-8 crystals in the CG network were achieved by regulating the molar ratio of Zn2+ to the glucosamine of the CS. In particular, the ZIF-8 crystals with spherical, cubic, tetrahedral, and cuboid shapes on the CGsZx were tuned by adjusting the molar ratio of Zn2+ to the glucosamine of CS. In addition, the ZIF-8 crystal with a petaloid morphology on the CG was obtained by using sodium tripolyphosphate (STPP) as a crosslinker. The synergistic effect of heterogeneous nucleation and coordination modulation were the main factors for the change of morphology and size of ZIF-8. The CGsZx exhibited a 441.7% adsorption capacity for CO2 which was higher than that of CG, and 65.3% higher than that of ZIF-8. After recycling five times, the adsorption capacity of the composite for C2 remained at 89.6%. The kinetics simulation indicates that the adsorption behaviour of CGsZx for CO2 was physical adsorption.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Nuan Xu,Zhenhua Tang,Yan-Ping Jiang,Junlin Fang,Li Zhang,Xiaofang Lai,Qi-Jun Sun,Jing-Min Fan,Xin-Gui Tang,Qiu-Xiang Liu,Ji-Kang Jian
Antibiotics play an essential role in the treatment of various diseases. However, the overuse of antibiotics has led to the pollution of water bodies and food safety, affecting human health. Herein, we report a dual-emission MOF-based flexible sensor for the detection of antibiotics in water, which was prepared by first encapsulating rhodamine B (RhB) by a zeolite imidazolium ester skeleton (ZIF-8) and then blending it with polyvinylidene difluoride (PVDF). The luminescent properties, structural tunability, and flexible porosity of the MOF-based composites were combined with the processability and flexibility of polymers to prepare luminescent membranes. The sensor is capable of dual-emission ratiometric fluorescence sensing of nitrofurantoin (NFT) and oxytetracycline (OTC), exhibiting sensitive detection of fluorescence burst and fluorescence enhancement, respectively, with detection limits of 0.012 μM and 8.9 nM. With the advantages of visual detection, high sensitivity, short detection time, and simplicity, the highly sensitive ratiometric fluorescent flexible sensor has great potential for detecting antibiotics in an aqueous environment. It will further stimulate interest in luminescent MOF-based mixed matrix membranes and their sensing applications.
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