JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 3
·730-738
·
IF 2.659
Yating Wang,Xu Li,Xiu Dai,Yixing Zhan,Xiaoqing Ding,Ming Wang,Xinglong Wang
BACKGROUND With the rapid industrial and urbanization development, a large amount of oily wastewater is generated from various sources. It is mutagenic and carcinogenic to human health and seriously affects the ecosystem. In this study PLA/ZIF-8@C600 nanofibers were prepared for oil adsorption. RESULTS Hybrid nanoparticles (ZIF-8@C600) of carbon black C600 and zeolitic imidazolate framework-8 (ZIF-8) with high specific surface area and porous structure were prepared by co-deposition and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FITR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and contact angle measurement. Biodegradable composite nanofiber membranes of poly(lactic acid) (PLA) and ZIF-8@C600 were manufactured by electrospinning. The SEM and contact angle results showed that the addition of ZIF-8@C600 could adjust the diameter, porosity, pore size and hydrophobicity of the composite electrospun nanofibers. The PLA/ZIF-8@C600 porous membranes had good oil sorption properties in oil–water mixture and emulsion. The oil adsorption capacity of the sample with 1 wt% ZIF-8@C600 was improved by ∼72.59% compared with that of pure PLA (13.5 g g −1 ), which demonstrated that the PLA/ZIF-8@C600 fibers were good candidates as oil sorbents. The adsorption kinetics of the membranes on paraffin liquid was in accordance with pseudo-second-order kinetics. CONCLUSION The addition of hybrid ZIF-8@C600 improved the hydrophobic properties and oil adsorption capacity of PLA/ZIF-8@C600 porous membranes. Because PLA is an environmentally friendly polymer, composite membranes based on it can avoid secondary pollution. Overall, these findings have good prospects for future treatment of oily wastewater. © 2019 Society of Chemical Industry
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高影响因子
BIOTECHNOLOGY LETTERS
·
2019
·Vol. 42
·期 2
·269-276
·
IF 2.154
Cai Xinyong,Zhang Mengjie,Wei Wei,Zhang Yinjun,Wang Zhao,Zheng Jianyong
A novel enzyme immobilization method employing metal–organic framework (MOF) encapsulation and macroporous resin adsorption was developed in this study. Candida antarctica lipase B (CALB) was firstly encapsulated onto metal–organic frame structures (Zeolitic imidazole framework-8, ZIF-8) and further bonded to macroporous resin by physical adsorption. Under optimized immobilization conditions, the activity of the prepared immobilized lipase (CALB-ZIF-8@D101) determined via the methyl esterification of oleic acid was 38.4 U/mg. Compared with free lipase, the immobilized lipase exhibited improved thermal and operational stability and organic solvent tolerance. These results demonstrate that the immobilization method of ZIF-8 encapsulation and macroporous resin adsorption enhanced enzyme properties at a superior level.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Kangling Yin,Huiping Zhang,Ying Yan
A novel microporous ZIF-67 membrane coating on paper-like stainless steel fibers (ZIF-67 membrane/PSSF) was successfully synthesized by a wet layup papermaking-sintering method followed by the seed-induced growth method. The effects of key factors such as crystallization temperature , synthesis time and Hmim/Co 2+ (2-methylimidazole/cobalt chloride) molar ratio on the morphology structure of the samples were studied by the modern characterization techniques including SEM, EDX , TEM, XRD , BET, FTIR and TGA, respectively. The experimental result indicated that the as-synthesized ZIF-67 membrane/PSSF was extremely compact with the average membrane thickness of 4.8 μm. And the sample exhibited high BET surface area (440.9 m 2 /g), uniform pore size (1.881 nm) and large pore volume (0.2096 cm 3 /g). The adsorption breakthrough experiment of toluene was performed on different bed reactors filled with ZIF-67 membrane/PSSF and granular ZSM-5 zeolites , respectively. The experiment data was well fitted by Yoon–Nelson model, where the values of rate constant in the fixed bed with ZIF-67 membrane/PSSF increased by 32.2% compared with that of commercial ZSM-5 zeolites at the flow rate of 100 mL/min. And the bed pressure drop and length of unused bed (LUB) were dramatically reduced by 39.6% and 16.8% in 3 cm ZIF-67 membrane/PSSF fixed bed. In conclusion, mass transfer efficiency was significantly enhanced based the structured ZIF-67 membrane/PSSF fixed bed, and this new material is a promising adsorptive material for VOCs removal.
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LANGMUIR
·
2022
·
IF 4.331
Hongbo Suo,Xinyue Geng,Yinghui Sun,Lu Zhang,Jie Yang,Fan Yang,Hui Yan,Yi Hu,Lili Xu
Interactions of enzymes with supports significantly affect the activity and stability of immobilized enzymes. Herein, amino-functionalized ionic liquid (IL)-grafted magnetic zeolitic imidazolate framework-90 (MZIF-90) was prepared and used to immobilize porcine pancreatic lipase (PPL). The nanocomposites were fully characterized; meanwhile, the interactions between ILs and ZIF-90 were calculated based on density functional theory. The prepared biocatalyst (PPL-ILs/MZIF-90) had a lipase loading of 178.3 mg/g and hydrolysis activity up to 287.5 U/g. When the biocatalyst was used to synthesize isoamyl acetate, the reaction media, molar ratio of alcohol/acid, temperature, and reaction time were optimized. Under the optimized reaction conditions (in hexane, alcohol/acid = 3:1, under 45 °C, reacted for 9 h), the ester yield reached 85.5%. The results of the stability test showed that PPL-ILs/MZIF-90 retained 88.7% of the initial activity after storing for 35 days and 92.5% of the initial activity after reusing for seven cycles for synthesizing isoamyl acetate. Moreover, the secondary structure analysis showed that the synthesized supports protected the active conformation of immobilized lipase, which lead to the enhanced catalytic performance. Additionally, the biocatalyst can be easily separated with a magnet, which facilitated the reusability. This study provides insights regarding the application of metal organic framework composites in the field of enzyme catalysis.
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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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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·18364-18379
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IF 5.19
Zhang Xiao,Li Zhiyue,Zhang Taoyi,Chen Jing,Ji Wenxi,Wei Yun
A low-cost and environmental-friendly sodium alginate-melamine@zeolitic imidazolate framework-67 (SA-ME@ZIF-67) adsorbent was fabricated by chemical grafting and in situ growth for the removal of lead ions in wastewater. Firstly, melamine (ME) was grafted onto sodium alginate (SA) by amide reaction, and then SA-ME was dropped into a solution of calcium chloride to form hydrogel bead, and ZIF-67 was grown on the SA-ME hydrogel bead by the in situ growth method. The SA-ME@ZIF-67 adsorbent was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The SA-ME@ZIF-67 adsorbent was used to effectively adsorb Pb(II) from aqueous solutions. The initial concentrations of lead ions, adsorbent dose, initial pH of lead ion solution, temperature, and adsorption time for the material were optimized. The adsorption isotherms and kinetics fitted to Langmuir isotherm model ( R 2 = 0.9281, 0.9420, and 0.9623 at the temperatures of 288.15 K, 298.15 K, and 308.15 K, respectively) and pseudo-second-order kinetic model ( R 2 = 0.9901) respectively. According to the Langmuir model at 308.15 K, the maximum adsorption capacity of the adsorbent for Pb(II) was 634.99 mg/g. The recycling application of the adsorbent was possible as it was easily collected and reused after five adsorption-regeneration cycles. In addition, the Pb(II) in real wastewater samples has been efficiently removed using the fabricated hydrogel. The results showed that the SA-ME@ZIF-67 adsorbent had high adsorption capacity, removal efficiency, and easy recyclability for Pb(II). Graphical abstract
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jia Wang,Xuan Zhao,Hongqiang Qu,Jianzhong Xu,Jing Ma
The property of the substrate takes a critical role in the separation performance of the thin-film composite (TFC) membrane. While, regulating the properties of the substrate by introducing metal–organic framework with tunable shapes for optimal TFC membrane has not been studied in-depth. In this work, a rationally regulated polyethersulfone substrate was designed by embedding ZIF-8 with three different shapes (spherical, hollow tube and flowerlike). Then, the TFC membranes were obtained by synthesising polyamide layer on the modified substrates. The results show that the modified substrates have positive effect on the water treatment performance, which was highly related to the addition amount and shapes of ZIF-8. Specifically, the hollow tube ZIF-8 modified TFC membrane exhibits the best water permeance of 2.22 L m -2 h −1 bar −1 (LMH bar −1 ) and excellent rejections (94.2 %, 99.7 %, 99.8 %, 99.9 % for NaCl, AO, MO and DR, respectively), which mainly derived from the increased channels and surface roughness. The findings provide a comprehensive insight of the shape-controlled substrate in the separation performance of the TFC membranes.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
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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DYES AND PIGMENTS
·
2023
·
IF 4.5
Yonghe Zhang,Ruonan Zhou,Jie Sun,Peixuan Li,Deyi Wu,Chunyan Yang,Peng Zhang,Zhenghua Ju
A donor-acceptor (D-A) phenothiazine derivative(PZQ) was designed and synthesized. The PZQ was characterized utilizing infrared (FTIR) and 1 H/ 13 C nuclear magnetic resonance. The fluorescence spectra of PZQ were investigated in various solvents with differing polarities to demonstrate the presence of positive solvatochromism was attributed to the intramolecular charge transfer. It was observed that the Stokes’ shifts increased proportionally with the polarity of the solvents, exhibiting a maximum value of 11420 cm −1 in the highly polar solvent (ACN). Moreover, a porous composite (PZQ@ZIF-8) was fabricated by encapsulating PZQ into the metal-organic framework (ZIF-8) to respond to the organic solvent vapors. The PZQ@ZIF-8 was characterized using infrared, X-ray diffraction (XRD). The fluorescence spectra of the PZQ@ZIF-8 displayed significant solvent-dependent emission. Most importantly, the PZQ@ZIF-8 exhibited high reusability, and a specific response to methanol vapor. The emission intensity of the PZQ@ZIF-8 was correlated with methanol vapor concentration negatively, which was essential for the practical sensing application.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2023
·
IF 6.1
Yi Ding,Jun Yuan,Feixu Mo,Shuai Wu,Yue Ma,Rongyu Li,Ming Li
Smart metal–organic framework nanocarriers that respond to microenvironmental stimuli related to plant diseases can achieve the on-demand release of active ingredients to control diseases. The plant essential oil citral (CT) has significant biological activity against most pathogens but its poor stability limits its application in the field. To improve the applicability of plant essential oils, we aimed to construct a pH responsive essential oil delivery system (CT@ZIF-8) based on the zeolitic imidazolate framework-8 in this study. The high specific surface area of ZIF-8 enables CT@ZIF-8 remarkable loading capacity, and the metal–organic framework effectively delays the volatilization of CT. The results showed that CT@ZIF-8 was approximately 177 nm in size, had a stable nanostructure, and displayed a high pesticide loading efficiency (15.22%). The photodegradation rate of CT loaded in ZIF-8 under UV irradiation (48 h) was only 17.99%, much lower than that of CT alone (51.18%). The CT@ZIF-8 had a pH-responsive controlled release property, releasing CT from CT@ZIF-8 in a pH-dependent manner. The bioactivity results showed that CT@ZIF-8 had a lower EC50 than CT against three fungi (Magnaporthe oryzae, Botryosphaeria dothidea, and Fusarium oxysporum), enhancing the antifungal activity of CT. After 3 d of reagent treatment, only CT@ZIF-8 maintained good control against rice blast (75.76%) and soft rot (63.69%) infection. We have constructed a smart delivery system for essential oils, which provides a new pathway for the efficient application of plant-derived essential oils in the green control of plant diseases.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhaowen Wang,Han Zhang,Haiyan Song,Xuefeng Bai
Development of a material with high adsorption capacity and selectivity for removal of strontium ion (Sr 2+ ) from nuclear wastewater is a challenge. Herein, dodecahedral zeolitic imidazolate frameworks-67 (ZIF-67) was successfully modified by potassium hexacyanoferrate(Ⅱ) (K 4 Fe(CN) 6 ) nanoparticles , and used as an effective adsorbent for Sr 2+ removal from model wastewater. In construction of adsorbent, methanol was used as the medium for assembly of ultra-fine and uniform 25 nm of K 4 Fe(CN) 6 nanoparticles on ZIF-67, well maintaining the original dodecahedral morphology and mesoporous structure of ZIF-67 crystal. N in 2-methylimidazole (2-MI) bonded with Co to generate ZIF-67, while the unsaturated Co in ZIF-67 bonded with N in K 4 Fe(CN) 6 to form spherical nanoparticles. Specific surface area of ZIF-67 were regulated by K 4 Fe(CN) 6 to an appropriate value of 607.464 m 2 ·g −1 for Sr 2+ adsorption. Adsorption efficiency of K 4 Fe(CN) 6 modified ZIF-67 for Sr 2+ was significantly enhanced to 90 % within 2 h at ambient conditions, due to the improvement in morphology, structure and chemical property of adsorbent. K 4 Fe(CN) 6 modified ZIF-67 exhibited high adsorption selectivity 45 mg·g −1 for Sr 2+ in the presence of competing metal ions such as K + , Na + , Mg 2+ and Ca 2+ , and thus achieved 40 mg·g −1 of adsorption capacity for Sr 2+ in actual tap water. Adsorption kinetics and isotherms were well fitted with the second-order kinetics and the Langmuir model, respectively, suggesting a chemisorption process. Mechanism studies showed that the surface of ZIF-67 was uniformly covered by ultra-fine nanoparticles, on the outer layer of which K + ions were distributed as the adsorption sites for ion exchange with Sr 2+ .
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PROCESS BIOCHEMISTRY
·
2023
·
IF 4.4
Ziping Ma,Chunyang Fang
The significant adverse effects and chemoresistance accompanying single-agent chemotherapy reduce its therapeutic effectiveness. The synergistic treatment of osteosarcoma with chemotherapy and photothermal therapy (PTT) has attracted much interest recently due to the improved therapeutic effectiveness of anticancer drugs. In this research, we engineered a new 5-fluorouracil (5FU) by modifying ZIF-8 nanocomposites with polydopamine (PD) and loading them with the drugs. Here, modifying PD prevented the drug's explosive release, enhanced the nanocomposites' biocompatibility, and rendered it more successful at absorbing near-infrared (NIR) light. Excellent photothermal effects were also seen when the PD/5FU@ZIF-8 NCs were exposed to NIR light and employed as a drug-targeted delivery device. In vitro biological tests showed that PD/5FU@ZIF-8 NCs effectively lowered mitochondrial membrane potentials (MMPs) in 143B cells, resulting in death; the addition of photothermal properties improved the anticancer impact and reduced the chemotherapeutic drug dose. In addition, the optimized PD/5FU@ZIF-8 NCs (30 μg/mL) demonstrated enhanced photothermal transformation capability and aided the killing of tumor cells. These findings definitively demonstrate that PD/5FU@ZIF-8 NCs have an additive impact on chemo-photothermal therapy and remarkable biocompatibility; these results have strong potential for preclinical translation for osteosarcoma and other cancer cells.
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危险品化学品经营许可证（带存储）