NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 21
·9382-9393
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IF 3.591
Xiangzhi Feng,Yuanyuan Li,Yuanyuan Yang,Yulong Ma,Wenxin Ji,Yonggang Sun,Tong Chen,Yang Chen
In order to achieve rapid and effective analysis of praziquantel and pymetrozine residues in food, a new magnetic solid phase extraction (m-SPE) material based on GO and ZIF-67 was synthesized. Because the release of ZIF and GO materials may lead to secondary environmental pollution and their separation from solutions is difficult, ZIF-67 loaded on sheet-like MGO@PDA, a magnetic porous nano-composite, was fabricated by a convenient method at room temperature. The poly-dopamine (PDA) layer can improve the hydrophilicity of the material. The resultant MGO@PDA@ZIF-67 preserved the properties of ZIF-67 and MGO. The adsorbent material was characterized by XRD, VSM, TEM, SEM, TGA, XPS and FTIR experiments. An m-SPE technique was developed to selectively enrich two pyridine ring insecticides (praziquantel and pymetrozine) using high performance liquid chromatography (HPLC). The adsorption mechanism was investigated. Results showed that the maximum adsorption capacities of the new material for praziquantel and pymetrozine are 22.68 and 24.27 mg g−1, respectively. The method was successfully applied to the analysis of praziquantel and pymetrozine in vegetable samples with satisfactory recoveries (92.3%–102.8%) and precisions. Due to the advantages of easy preparation, high efficiency, and renewability, the prepared hydrophilic magnetic porous nano-composite is an excellent candidate for adsorption and separation and provides a promising magnetic ZIF-67 material for multi-component system separation.
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高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Yingchun Guo,Lei Feng,Changcheng Wu,Xiaomei Wang,Xu Zhang
Rational design and fabrication of metal–organic framework (MOF)-derived ordered hierarchical macro-/meso-/microporous N-doped carbon materials featured with the atomically dispersed metal atoms can effectively enhance their catalytic performance. Herein we develop a template-assisted strategy, namely the confined growth and pyrolysis of single-crystalline zeolite imidazolate framework-8 (ZIF-8) in three-dimensional ordered template voids, to create hierarchical porosity in MOFs-derived N-doped carbon materials. The as-synthesized single-atom Zn on N-doped hierarchically ordered porous carbon polyhedrons (Zn-N-HOPCPs) show integrated Lewis acid (single-atom Zn) and base sites (pyridinic N), high surface area (1128 m 2 ·g −1 ), large pore volume (0.90 cm 3 ·g −1 ), periodically interconnected open windows (~55 nm), highly accessible micro/mesopore channels (0.55, 0.8, 1.2, and 4 nm), and abundant Zn content (5.8 wt%). The hierarchical nanoarchitecture (macro-/meso-/micropores) significantly facilitates mass transfer for bulky-molecule-involved reactions and exposes inside active sites, resulting in satisfactory CO 2 photoconversion under mild conditions. The strategy presented here sheds light on the design and fabrication of various hierarchically ordered porous carbon decorated with atomically dispersed metal atoms for other important applications.
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JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 28
·期 1
·29-38
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IF 2.183
Yang Shuquan,Wang Yating,Li Huazheng,Zhan Yixing,Ding Xiaoqing,Wang Ming,Wang Xinlong,Xiao Leqin
p -Hydroxybenzoic acid is an emerging contaminant because it has multiple sources such as the hydrolysis of methylparaben, ethylparaben and propylparaben used widely as preservatives in food and drinks, and as well as from the agro-industrial wastewaters. In this study, the nano-ZIF-8@chitosan microspheres (ZIF-8@CSM) were fabricated via the combination of inverse emulsion method and in-situ growth method. The performance of ZIF-8@CSM for the adsorption of p -hydroxybenzoic acid from aqueous solution was studied. The adsorption kinetics showed that the adsorption rapidly reached the equilibrium about 30 s. The equilibrium data were well described by the Langmuir isothermal model and the estimated maximum adsorption capacity was 128.70 mg/g. The thermodynamics analysis indicated negative free energy, enthalpy, and entropy changes suggesting that the adsorption process was spontaneous and exothermic. ZIF-8@CSM is promising to be used as a good adsorption material to remove p -hydroxybenzoic acid rapidly from aqueous solutions.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
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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Journal of Materials Chemistry C
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2020
·Vol. 8
·期 22
·7476-7484
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IF 7.059
Xudong Zhou,Xiaoyun Liu,Zhongkai Cui,Jinlou Gu,Shaoliang Lin,Qixin Zhuang
A new-type of hollow silica@ZIF-8 (HMS@ZIF-8) particle was successfully designed, fabricated and introduced into the fluorinated polybenzoxazole (6FPBO) matrix to prepare the HMS@ZIF-8/6FPBO composite film. Metal–organic frameworks (MOFs) were connected to the surface of hollow silica via covalent bonds, leading to the formation of a shell. Pre-6FPBO prepared from a precursor could be dissolved in organic solvents besides strong corrosive acids, which could protect the filler. HMS@ZIF-8/6FPBO composite films prepared through in situ polymerization and coating exhibited outstanding properties. At both high and room temperatures, the material exhibited excellent dielectric properties. The dielectric constant and dielectric loss decreased down to 2.12 and 0.04, respectively under 1 kHz with the filling of HMS@ZIF-8 particles. HMS@ZIF-8 particles as a filler, evenly dispersed in the matrix, could also improve the tensile modulus of 6FPBO. The tensile modulus of HMS@ZIF-8/6FPBO (6 wt%) increased up to 2.11 GPa, 54% higher than that of the pure 6FPBO matrix. Meanwhile, the composite films demonstrated excellent thermal stability, i.e. the 5% weight loss temperature was higher than 520 °C. This is the first report on MOFs being applied as low dielectric absorbing materials. We believe that the HMS@ZIF-8/6FPBO composite film designed and developed based on this strategy is suitable to be employed in large-scale integrated circuits owing to its excellent dielectric performance, mechanical properties and thermal stability.
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高影响因子
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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高影响因子
CHEMICAL ENGINEERING JOURNAL
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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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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jie Yang,Ao Zhang,Yuxin Chen,Linsheng Wang,Meixian Li,Hongyu Yang,Yanbei Hou
Biomass materials are considered to be excellent candidates to replace petroleum-based materials, but inherent flammability limits their applications. In this work, biomass aerogel (BA) was prepared by freeze-drying method from sodium alginate (SA) and polyvinyl alcohol (PVA). To improve fire safety of BAs, a core–shell structured ZIF-67@Cobalt coordination compound was successfully synthesized, which was surface functionalized by 3,5-diamino-1,2,4-triazole and 9,10-dihydro-9-oxo-10-phospho-diphenyl-10-oxide (DOPO), named as DOPO-NH 2 -ZIF-67. The addition of DOPO-NH 2- ZIF-67 (2 wt%) outstandingly improved fire safety of BA, in contrast to neat BA, peak heat release rate, peak smoke production rate, and total smoke production were reduced by 66.6%, 85.10%, and 72.76%, respectively. Furthermore, the incorporation of ZIF-67 and its derivatives has no adverse effect on the thermal insulation performance of BA composites and significantly improved their compressive strength from 0.27 MPa to 1.76 MPa. Preparation of core–shell structured ZIFs rich in active groups furnishes a conceivable way to synthesize an effective flame retardant, and a prospective method for the fabrication of aerogel insulation materials with green and economical additive-free technology is proposed.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Jingjing Zhu,Huaqiang Chen,Lan Wang,Engang Fu,Jianping Wu,Qilei Zhang,Lirong Yang,Gang Xu
A composite hollow mesoporous MIL-101@Pd@ZIF-8-30min (HM-MIL@Pd@ZIF-30min) nanocatalyst with hollow core and stable shell was developed in this study. Hollow mesoporous MIL-101(HM-MIL) was hydrothermally synthesized and employed as the supports of Pd nanoparticles by adopting a facile HM-MIL-template strategy to make ZIF-8 crystals uniformly overgrew on HM-MIL-101@Pd microcrystal cores. The obtained core-shell catalyst possessed hollow mesoporous structure, and the shell layer of ZIF-8 had additional advantages of abundant Lewis basic sites for heterogeneous racemization reaction. Compared with unmodified HM-MIL@Pd and solid MIL-101(Cr)@Pd@ZIF-8 (S-MIL@Pd@ZIF-8), HM-MIL@Pd@ZIF-8-30min had higher racemic chemical activity (conv. 99%) and selectivity (sel. R-amide 94%) in one-pot dynamic kinetic resolution (DKR) reaction system of rac -1-phenethylamine. The catalyst showed excellent stability, and the conversion and selectivity reached 95% and 93% respectively after ten catalytic cycles.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Di Liu,Jiulong Yin,Hai Tang,Hui Wang,Shasha Liu,Tingting Huang,Sisheng Fang,Kaixuan Zhu,Zongli Xie
Efficient separation and excellent antifouling performance of ultrafiltration (UF) membrane are highly desirable for sustainable wastewater treatment. This work reports a novel ZIF-67-imbedded PVDF (ZIF-67@PVDF) mixed-matrix UF membrane fabricated by nonsolvent-induced phase separation (NIPS) technique to reinforce efficient removal of dye wastewater via sulfate radical enhancement. The imbedded ZIF-67 well-dispersed within the membrane improved the membrane pore structure and benefited peroxymonosulfate (PMS) activation to generate sulfate radical that were confirmed by Electron spin resonance (ESR) spectroscopy. As a synergistic effect of pore structure and sulfate radical generation, the separation, antifouling and catalytic performance of the ZIF-67@PVDF membranes were greatly enhanced over a wide pH range. Even at a high pH of 11, the PMS on-line cleaning assisted ZIF-67@PVDF-1.0 membrane achieved high dye removal efficiency for orange Ⅱ (AO7, 97.3%), Methylene blue (98.2%), Rhodamine B (90.5%). The ZIF-67@PVDF membrane also showed good reusability and stability. This work demonstrates great potential of using self-cleaning UF membranes to treat dye wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xufei Li,Baoyou Yan,Weiqiu Huang,Hui Bian,Xinya Wang,Jiahui Zhu,Shaocan Dong,Yuyu Wang,Weihua Chen
To overcome the shortage of conventional synthetic methods, such as long reaction time at high temperature and pressure (HTP) or poor performance at room temperature and pressure (RTP), a facile and economical strategy was employed to prepare high-performance ZIF-90 for the first time at RTP only by adding triethylamine (TEA). Herein, we successfully prepared ZIF-90 nanocrystals by a two-step stirring method within several minutes (5–30 min) and their structure parameters (e.g., BET surface areas, 916–1235 m 2 ·g −1 ) were also tuned simultaneously, which were much better than reported samples prepared at RTP. Afterwards, by changing functional ligands, hydrophobic ZIF-90-CF 3 with low surface energy was also designed. With the ligand side of aldehyde (–CHO) and trifluoromethyl (-CF 3 ) groups on ZIF-90 and ZIF-90-CF 3 , the water vapor uptakes and adsorption heats decreased from 7.9 to 0.79 mmol·g −1 and 20.6 to 2.6 kJ·mmol −1 , respectively. Additionally, a shaped ZIF-90-CF 3 /melamine foam (MF) composite with both hydrophobic and oleophilic properties exhibited extraordinary organic compounds (OCs)-water separation ability, including a high adsorption capacity (40.1–108.7 g‧g −1 ) towards various OCs. Furthermore, owing to its excellent compressibility and mechanical stability, the ZIF-90-CF 3 /MF composite can be regenerated by slightly squeezing the adsorbed OCs, indicating the potential for possible commercialisation of the derived MOF/MF composites for the efficient purification of wastewater.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
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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