JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Zi-Wei Wang,Kai-Wei Chen,Ao-Tian Gu,Xin-Yu Zhou,Peng Wang,Chun-Hui Gong,Ping Mao,Yan Jiao,Kai Chen,Ji-Gen Lu,Yi Yang
Radioactive iodine generated from nuclear waste and nuclear accidents can cause serious hazards to the environment and human body. In this study, bismuth-doped ZIF-8 composites (Bi 2 O 3 @ZIF-8) were synthesized by in situ synthesis at room temperature to study their adsorption of iodine in gaseous state and in solution. The Bi 2 O 3 @ZIF-8 composites were characterized and analyzed by means of tests. Bi 2 O 3 @ZIF-8 exhibited high specific surface area and contained abundant microporous structures. However, when the bismuth doping amount reached 10%, 10%-Bi 2 O 3 @ZIF-8 appeared mesoporous . The specific surface area of 1%-Bi 2 O 3 @ZIF-8, 5%-Bi 2 O 3 @ZIF-8 and 10%-Bi 2 O 3 @ZIF-8 could reach 1110.6 m 2 /g, 973.21 m 2 /g and 927.82 m 2 /g, respectively. The adsorption of gaseous iodine by 5%-Bi 2 O 3 @ZIF-8 reached equilibrium after 3.5 h with the maximum adsorption capacity of 298 wt%. And the maximum adsorption capacity of iodine in solution was 751.4 mg/g. The effects of the initial concentration of the solution, reaction temperature and contact time on the adsorption process were investigated. The adsorption of Bi 2 O 3 @ZIF-8 on iodine was consistent with the pseudo-second-order kinetics and the Langmuir model. The results of thermodynamic studies indicated that the adsorption of iodine by Bi 2 O 3 @ZIF-8 was spontaneous and exothermic. This study provides a reference for the synthesis of metal organic framework-based materials and provides theoretical guidance for the removal of practical radioactive iodine.
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JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Wen Li,Xinyue Cui,Zilin Chen
An online capillary electrophoresis method based-lipase immobilized enzyme microreactor was developed for lipase kinetic study and inhibitor screening from compounds from natural products. Zeolitic Imidazolate Framework-8 (ZIF-8) has the advantages of large pore size, mild synthesis conditions and good biocompatibility. Lipase was immobilized on the inner wall of capillary with the help of the metal-organic framework ZIF-8. The results of electron microscopy showed that lipase could be aggregated and fixed on the inner wall of capillary by ZIF-8. After the experimental conditions including electrophoretic separation and enzymatic reaction were optimized, the baseline separation of substrate p-nitrophenyl acetate (pNPA) and product p-nitrophenol (pNP) was achieved within 3 min. The immobilized enzyme microreactor showed good repeatability and stability, and the determined Michaelis-Menten constant ( K m ) of lipase was 2.75 mM, which was lower than the kinetic constant determined in off-line reaction, indicating that the immobilized enzyme had a high affinity with the substrate. In addition, the IC 50 value of the positive control compound orlistat on lipase inhibition was 7.26 nM, which was consistent with the literature. Then the inhibitory activity of 10 compounds from natural products on lipase was evaluated by the ZIF-8-IMER. Among them, 7 compounds including baicalein, luteolin, epicatechin gallic acid, and chlorogenic acid, had a certain inhibitory effect on lipase. The molecular docking technology proved the interaction between the enzyme and the screened inhibitor, which provides a new method for the screening of lipase inhibitors.
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Particuology
·
2022
·
IF 3.251
Yukui Gou,Yuanye Hao,Weilong Cai,Jianying Huang,Yuekun Lai
Particulate matter (PM) is a significant danger to both environment and human health. Despite the development of a series of air filters, they do not work well in harsh environment such as high temperature, high humidity or long-time filtration. To make a three-dimensional (3D) particle capture device, a sacrificial template approach was used to manufacture polydimethylsiloxane (PDMS) sponge, and then zeolite imidazole framework-8 (ZIF-8) was grown in situ on the 3D network of PDMS sponge. The removal efficiency of PM 2.5 or PM 10 is greater than 99.8% because of the high specific surface area and porous network structure of PDMS sponge, as well as the large number of metal sites of ZIF-8. In addition, the sponge filter has long-term filtration stability and still achieves excellent performance after 65 h of filtration. The composite sponge can adapt to harsh environments such as high temperature (250 °C) and high humidity (90% RH). Composite sponge filter has a regular shape, and it may be customized to any shape as required. This study provides a new idea for designing 3D high-efficiency air filters that can adapt to harsh environments.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Xingxing Zhao,Yudong Ding,Lijiao Ma,Xun Zhu,Hong Wang,Qiang Liao
Porous liquids (PLs) with porosity and fluidity have shown great potential in gas separation. In this work, a type-III PLs were synthesized by mixing 2-Methylimidazole zinc salt (ZIF-8) nanoparticles as the main units and 1-Ethyl-3-methylimidazolium Bis(trifluoro-methanesulfonyl)-imide ([EMlm][NTf 2 ]) as the solvent. Molecular dynamics simulation evidenced the permanent, vacant, rigid pores of PLs. The prepared PLs were characterized, and their CO 2 uptake performances were obtained using a CO 2 static absorption system. ZIF-8 could significantly increase the CO 2 absorption capacity of the porous liquid, and when the mass fraction of ZIF-8 inside PLs was 10 wt%, the CO 2 absorption capacity increased by 143 %. Then, the CO 2 absorption characteristics of porous liquids were studied in different conditions, including temperature, pressure, and concentration of the ZIF-8. The CO 2 adsorption heat calculated by the Clausius–Clapeyron relation is −6.5 kJ/mol. The absorption rate of PLs was studied using the damping film theory. The CO 2 uptake capacity of the PLs decreased with temperature but increased with pressure and CO 2 concentration. Subsequently, the absorption-adsorption model was established to predict the CO 2 uptake capacity of PLs. The theoretical values agree with the experimental values, indicating that the developed absorption-adsorption model can predict the CO 2 uptake properties of PLs. Finally, analysis of the CO 2 cyclic performance of the PLs showed the PLs could be regenerated under negative pressure, and the CO 2 uptake capacity remained stable after five cycles, indicating the [EMIm][NTf 2 ]/ZIF-8 PLs could be applied in CO 2 capture.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Sheng Liu,Yiyang Zeng,Jun Liu,Jiamao Li,Hao Peng,Hui Xie,Hao Zou,Chengjian Xiao,Xiaohui Hua,Jingliang Bao,Liang Xian,Yuanli Li,Fangting Chi
The capturing and storage of iodine from nuclear waste through secure and advantageous techniques are significant. In this work, a novel bismuth-based porous carbon material referred to as Bi@MVF is elaborately synthesized employing a dipping-reduction technique to seize iodine-129 ( 129 I), in which bismuth particles are uniformly embedded and allotted on the porous carbon network as multiple active sites. Accordingly, Bi@MVF lets in a highly-efficient iodine absorption potential of up to 1560 mg/g after publicity to iodine at 120 ℃ for 4 h, superior to most standard iodine adsorbents. The excessive adsorption kinetics of these Bi@MVF adsorbents is typically attributed to the specific porous carbon substrates' full-size particular surface area and the adsorbent’s synergistic effect. An in-depth perception of the iodine adsorption mechanism exhibits that the chemical adsorption turns into a powerful mechanism via the reaction between bismuth and iodine to structure a steady section BiI 3 . Moreover, an easy post-treatment system for these Bi@MVF adsorbents is adopted to gain the greater corrosion-resistant iodine-binding segment Bi 5 O 7 I, attaining a nominal iodine leaching rate. Therefore, the designed Bi@MVF will be a tremendous 129 I stabilizer, and we will contribute a new approach for customizing new iodine adsorbents with excessive adsorption doses.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Tao Yan,Jianhua Yang,Jinming Lu,Liang Zhou,Yan Zhang,Gaohong He
Due to the poor heterogeneous nucleation properties of MOFs crystal on ceramic substrates resulting from the absence of interaction of MOFs with support substrate surface, it is usually difficult to prepare well-intergrown MOF membranes on substrate by simple in situ growth. In this work, a novel synthesis strategy was used to prepare defect-free ZIF-8 membranes on α-Al 2 O 3 supports by depositing gold particles modified with 2-mercaptoimidazole which creates pseudo-surfaces to bridge the metal centers with support. The end groups of the 2-mercaptoimidazole guides the heterogeneous nuclei to the support surface as homologous-like ligands. Furthermore, investigation of the metal sources revealed that the ZIF-8 membranes prepared with Zn(OAc) 2 as the zinc source possessed more continuous and well-intergrown ZIF-8 membranes with a thickness of about 1 μm compared to other zinc sources. The results of gas separation performance show that the optimized ZIF-8 membranes possess high hydrogen permeance and thermal stability. The gas separation selectivity for binary H 2 /CH 4 mixture reached 20.8 at 150 °C and 1 bar, with a high H 2 permeance of about 6.15 × 10 −7 mol m −2 s −1 Pa −1 , which is promising for hydrogen separation and purification. Moreover, free-organic solvents and room temperature growth by our strategy dramatically reduces the difficulty of preparation and environmental destruction, thus offering a new avenue to prepare MOFs membrane with good separation performance.
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CARBON
·
2022
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IF 11.307
Haixing Gao,Shuo Wang,Weng-Chon (Max) Cheong,Kaixi Wang,Huifang Xu,Aijian Huang,Junguo Ma,Jiazhan Li,Weng-Fai (Andy) Ip,Kwan San Hui,Duc Anh Dinh,Xi Fan,Feng Bin,Fuming Chen,Kwun Nam Hui
Defects in nanocarbon materials can trigger their intriguing electrochemical properties and potential applications, but their synthesis is challenging. Herein, we report the synthesis of ultrathin nitrogen-doped carbon nanosheets with intrinsic defects through the pyrolysis of ZIF-8 with linker vacancies. The as-synthesized electrocatalyst exhibits excellent oxygen reduction reaction (ORR) activity with an onset potential and half-wave potential of 1.05 and 0.873 V vs. RHE , respectively, outperforming the reported metal-free ORR electrocatalysts. It also shows a commercial Pt/C-comparable performance in zinc–air battery with a power density of 154.4 mW cm −2 . Characterization and DFT calculation results suggest the adjacent sp 3 -carbon in carbon pentagon can significantly strengthen the adsorption and activation of oxygen molecules on sp 2 -carbon, hence the potential determining step is altered and ORR overpotential is lowered. This work highlights a promising green synthesis strategy of MOF-derived metal-free nanocarbon materials for wide application in advanced energy technologies .
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ChemistrySelect
·
2022
·Vol. 7
·期 38
·e202202721
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IF 2.307
Jiale Lin,Yongfa Cheng,Oi-Ming La,i,Chin-Ping Tan,Worawan Panpipat,Cai Shen,Ling-Zhi Cheong
Graphical Metal ion dopped-Candida rugosa lipase was encapsulated into ZIF structure through biomimetic mineralization, Mg 2+ doping has changed the conformation of CRL resulted in enhanced structural stability of CRL. CRL/Mg 2+ @ZIF-8 was used in biosensing of a protox-inhibiting herbicide in fruit samples with wide detection range, low detection limit and good recovery rate, and Catalytic activity of was two-fold higher than that of CRL@ZIF-8. Present work encapsulated metal ion dopped-Candida rugosa lipase (CRL) into ZIF structure through biomimetic mineralization and evaluated hydrolytic activity of the immobilized lipase using a biphasic system. Magnesium ion (Mg 2+ ) doped-CRL with high hydrolytic activity (237 % of free CRL) was successfully synthesized. Circular dichroism and fluorescence spectroscopy analysis revealed Mg 2+ doping has changed the conformation of CRL resulted in enhanced structural stability of CRL. The synthesized CRL/Mg 2+ @ZIF-8 had a mesoporous (3.88 nm) structure with good crystallinity. Mg 2+ doping increased the catalytic activity, substrates affinity (lower Km of 0.4102 mM) and catalytic stability of immobilized CRL. Catalytic activity of CRL/Mg 2+ @ZIF-8 (0.25±0.012 U) was two-fold higher than that of CRL@ZIF-8 (0.10±0.008 U). The synthesized CRL/Mg 2+ @ZIF-8 was used in biosensing of a protox-inhibiting herbicides (nitrofen) in fruit samples. CRL/Mg 2+ @ZIF-8 can be used for biosensing of nitrofen with wide detection range (0-50 μM), low detection limit (0.47 μM) and good recovery rate.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Zhengchi Yin,Xiaoke Wu,Yanwei Yang,Huayu Zhang,Wangtao Li,Ruimin Zhu,Qiancheng Zheng,Zhengbao Wang
Compared to inorganic supports, polymeric supports can offer additional benefits, e.g. , easier processing and cheaper. However, the organic surface has weak adhesion to the zeolitic imidazolate frameworks (ZIFs) membrane layer, which usually requires complex surface modification or seeding. Herein, we demonstrate that a dual-layer asymmetric polymer support prepared by a simple spinning process is a good candidate for the preparation of ZIF-8 membrane. The inner layer of the support is an organic hollow fiber (PES) with finger-like pores, and the outer layer is a ZnO-PES composite layer with finger-like pores also. The ZnO-PES composite layer is expected to contain uniform ZnO crystals in the polymer matrix, i.e ., the ZnO particles in the skin layer of the support are not easy to fall off. Under the induction of ZnO particles in the outer layers, continuous ZIF-8 membranes can be prepared by single in-situ crystallization, showing good adhesion to the supports. The obtained ZIF-8 membranes show a H 2 permeance of 8.7 × 10 −8 mol·m −2 ·s −1 ·Pa −1 with a H 2 /N 2 ideal separation selectivity of 18.0. The design and preparation of this dual-layer polymer support is expected to promote the large-scale application of MOF membranes on polymer supports.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Chao Xue,Qu Zhang,Wenpeng Li,Gary Ownes,Zuliang Chen
The removal of antimonate (Sb(V)) species from wastewaters has become a growing concern due to their known genotoxicity and carcinogenicity. In this paper, a hybrid ZIF-8@FeNPs material was synthesized from Zeolite Imidazole Framework-8 (ZIF-8) and zero-valent iron nanoparticles ( n ZVI) and subsequently used to remove Sb(V) from aqueous solution. Characterization indicated that ZIF-8@FeNPs were successfully synthesized and that the valence state of Sb(V) did not change during the removal process, where adsorption of Sb(V) was facilitated by the high specific surface area and porosity of the hybrid. Advanced characterization also showed that Zn-OH and iron oxides were adsorbed on the material after complexation with Sb(V). Kinetic, isothermal, and thermodynamic modeling indicated that the adsorption process followed pseudo-second-order kinetics, via multilayer adsorption which was spontaneous and endothermic. A Sb(V) removal mechanism based on adsorption was proposed. In mining wastewater containing 1.121 mg·L −1 Sb(V), 89.7 % could be removed by the material. During repeated reuse of ZIF-8@FeNPs for the removal of 1 mg·L −1 Sb(V) through four successive cycles, the removal efficiency was still relatively high (39.1 %) after the fourth cycle indicating good potential for practical applications. In addition, ZIF-8@FeNPs also exhibited magnetic properties, which demonstrated that Sb(V) could be easily recovered from wastewater post removal by ZIF-8@FeNPs.
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ACS Biomaterials Science & Engineering
·
2022
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IF 5.395
Libing Wang,Fei Dai,Yusheng Yang,Zehua Zhang
Titanium (Ti)-based implants are widely utilized in artificial joints, pedicle screws, and dental implantations due to their excellent biocompatibility, near perfect mechanical capacities, and strong corrosion resistance. However, the Ti substrates are bioinert and lack desirable antibacterial abilities, severely hindering their bone regeneration applications. Herein, the titania nanotubes (TNTs) are fabricated onto the Ti surfaces through anodic oxidation. They are then modified with naringin (Nar)-loaded zeolitic imidazolate framework-8 (ZIF-8) in order to obtain a multifunctional coating (TNT-ZIF-8@Nar) via hydrothermal treatment. The TNT-ZIF-8@Nar exhibits excellent pH-responsive properties and a strong antimicrobial effect against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) by releasing Zn2+ and Nar. TNT-ZIF-8@Nar coatings significantly enhance the proliferation and osteogenic differentiation of osteoblasts. Furthermore, in vivo studies demonstrated the efficacy of TNT-ZIF-8@Nar coatings in improving osseointegration and antibacterial capabilities. This work shows the promising therapeutic potential of TNT-ZIF-8@Nar in its ability to inhibit implant-associated infections and achieve favorable osseointegration simultaneously.
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Reproductive Biology
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2022
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IF 2.089
Jing Xia,Shujuan Wu,Gengxiang Wu,Jing Yang
It has been reported that oxidative stress and chronic inflammation may be involved in the pathogenesis of polycystic ovary syndrome (PCOS). 8-oxoguanine DNA glycosylase (OGG1) is the main glycosylase that catalyzes the excision of DNA oxidation products. In this study, we investigated the role and potential mechanisms of OGG1 in the development of PCOS. We first analyzed OGG1 levels in serum and follicular fluid (FF) of PCOS patients , and significantly elevated OGG1 levels were noted in PCOS patients. We similarly observed a significant upregulation of OGG1 expression levels in ovarian tissue of the dehydroepiandrosterone (DHEA)-induced PCOS rat model. In addition, increased apoptosis and increased production of reactive oxygen species (ROS) were observed after the addition of OGG1-specific inhibitor (TH5487) in human granulosa-like tumor cell line (KGN) cells following a concentration gradient, along with a significant decrease in mRNA levels of inflammatory factors such as CXCL2 , IL-6, MCP1, IL-1β, and IL-18. Significant decreases in protein phosphorylation levels of P65 and IκBα were also observed in cells. In addition, we found a significant positive correlation between OGG1 and IL-6 expression levels in human and DHEA-induced PCOS rat models. In conclusion, our results suggest that OGG1 might be involved in the pathogenesis of PCOS by regulating the secretion of IL-6 through NF-κB signaling pathway , and there might be a balance between the inhibition of oxidative stress and the promotion of chronic inflammation by OGG1 on KGN cells.
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