JOURNAL OF CHEMICAL PHYSICS
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2024
·Vol. 160
·期 20
·
IF 3.1
Li Qingxia,Song Dongmei,Zhan Xinxing,Tong Xin,Hu Changgang,Tian Juan
Zeolitic Imidazolate Frameworks-8 (ZIF-8) is commonly used as an ideal precursor for non-noble metal catalysts because of its high specific surface area, ultra-high porosity, and N-rich content. Upon pyrolyzing ZIF-8 at 900 °C in Ar, the resulting material, referred to as Z 8 , displayed good activity toward the oxygen reduction reaction (ORR). Then the ZIF-8 was mixed with various conductive carbon materials, such as multiwall carbon nanotubes (MWCNTs), Acetylene black (ACET), Vulcan XC-72R (XC-72R), and Ketjenblack EC-600JD (EC-600JD), to form Z 8 composites. The Z 8 /MWCNTs composite exhibited enhanced ORR activity owing to its network structure, meso-/microporous hierarchical porous structure, improved electrical conductivity, and graphitization. Subsequently, iron and nitrogen co-doping is achieved through the pyrolysis of a mixture comprising Fe, N precursor, and ZIF-8/MWCNTs, which is denoted as FeN-Z 8 /MWCNTs. The intrinsically high electrical conductivity of MWCNTs facilitated efficient electron transfer during the ORR, while the meso-/microporous hierarchical porous structure and network structure of Fe, N co-doped ZIF-8/MWCNTs promoted oxygen transport. The presence of Fe-containing species in the catalyst acted as activity centers for ORR. This strategy of preparing Z 8 composites and modifying them with Fe, N co-doping offers an insightful approach to designing cost-effective electrocatalysts.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Chunxin Jin,Shuai Liu,Xiaofang Chen,Yanhong Li,Jürgen Caro,Aisheng Huang
Optimal orientation is the key factor to optimize the gas separation performance of metal-organic framework (MOF) membranes. However, it is still greatly challenging to prepare large-area oriented MOF membranes for industrial applications. Herein, we prepared compact and (100) oriented zeolitic-imidazolate framework-8 (ZIF-8) membranes with membrane area up to 500 cm 2 on the graphite substrate via support-induced strategy within 2 h. With membrane thickness of only 620 nm, the (100) oriented ZIF-8 membranes exhibit high gas separation performances due to the reduction of inter-crystalline defects and permeation resistance. At 100 °C and 1 bar, the separation factors of H 2 /CO 2 , H 2 /CH 4 and H 2 /C 3 H 8 are 18.5, 58.2 and 101.6, respectively, with H 2 permeance of about 160 x 10 −9 mol m −2 s −1 ·Pa −1 . The different positions of the 500 cm 2 ZIF-8 membrane show complete consistency in orientation and separation performance, recommending this membrane suitable for future industrial applications. Further, also oriented ZIF-67 and MOF-303 membranes can be consistently prepared by this strategy, confirming its versatility for the preparation of large-area MOF membranes.
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Journal of Energy Storage
·
2024
·
IF 8.9
Mengqi Liu,Honglin Yu,Daiming Liu,Guodong Zhang,Fei Wang
In order to enhance CH 4 adsorption and absorption performance, ZIF-8@Cu was prepared by precipitation method at room temperature, while a hydrate accelerator of SO 3 − @PSNS was synthesized by the polymerization method, and CH 4 adsorption-absorption synergistic storage in ZIF-8@Cu that pre-adsorbed SO 3 − @PSNS solution was evaluated for the first time. It was found that Cu 2+ can effectively improve the adsorption kinetics of CH 4 , causing ZIF-8@Cu to reach a higher adsorption capacity, and CH 4 adsorption capacity of ZIF-8@Cu /0.14% is 12.45 % higher than that in ZIF-8. Furthermore, Cu 2+ provides additional nucleation sites for CH 4 hydrate, thereby enhancing the overall CH 4 storage density. For the water content of R w = 0.5, the doping of 0.14 % Cu 2+ causes CH 4 storage capacity via adsorption-absorption synergy increases by 33.93 %. It is worth to note that SO 3 − @PSNS significantly reduces hydration pressure while retains CH 4 adsorption ability in ZIF-8@Cu. For R w = 0.5, hydration pressure in SO 3 − @PSNS system reduces by up to 45 % compared with that in water system, while CH 4 storage capacity increases by up to 94 %. This finding makes it possible for CH 4 dense storage under low pressure via adsorption-hydration hybrid approach.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yile Fu,Zina Wang,Tian Tian,Guan Li,Jinghua Gu,Jun Zhou,Sheying Dong
Despite the promising potential of zeolitic imidazole framework-8 (ZIF-8) for dye adsorption, addressing challenges such as aggregation and recycling difficulties remains essential. Herein，a novel three dimensional (3D) carboxymethyl cellulose (CMC), graphene oxide (GO) and ZIF-8 hybrid aerogel (CGZ-3) was prepared via blending ZIF-8 into the CMC-GO matrix. The structure and composition of CGZ-3 were characterized by SEM, FT-IR, TG and XPS. Adsorption experiments were conducted to optimize various parameters affecting the behavior of methylene blue (MB) adsorption. The composite aerogel exhibited an obvious lamellar network structure, with a surface rich in oxygen-containing functional groups such as -OH and -COOH. CGZ-3 demonstrated a rapid adsorption rate for MB, achieving a removal efficiency of 96% within 15 minutes. The entire adsorption process was spontaneous and endothermic, consistent with the pseudo-first-order kinetic model and Langmuir adsorption isotherm model. The maximum theoretical adsorption capacity was 427.35 mg/g at 298 K. Selective adsorptions tests demonstrated high selectivity of the composite aerogel for MB, and dynamic adsorption further confirmed the exceptional adsorption capacity of CGZ-3. After five cycles of adsorption-desorption, the MB removal rate remained above 95%, with an adsorption capacity exceeding 240 mg/g, highlighting the stability and reusability of CGZ-3. Collectively, the CGZ-3 would be a potential material for the adsorptive removal of MB in practical water treatment.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Shiyuan Liang,Liyuan Chen,Cong Liu,Bowen Guo,Yijie Fan,Zhou Li,Yan Liu,Dan Luo
Antioxidant enzymes are considered to be the most direct and safe candidates to effectively resist oxidative stress and treat senile osteoporosis. However, due to their size, existing enzyme delivery carriers are inevitably endocytosed by cells and subsequently enter endosomes/lysosomes with low pH and rich in acid hydrolase, resulting in the limited therapeutic effects. In this work, an ultrasmall superoxide dismutase (SOD) nanoformulation reinforced with ultrathin ZIF-8 coating (utZIF-SOD) via in situ coordination-mediated self-assembly strategy is constructed. Notably, utZIF-SOD achieves direct, efficient cellular uptake mediated by small size effect, thereby avoiding lysosomal degradation. In particular, ultrathin ZIF-8 coating strengthened the stability of enzyme. Even in aged cells with high oxidative stress levels, utZIF-SOD maintained excellent stability, and its efficiency in scavenging excess intracellular reactive oxygen species (ROS) is ≈1.5 times that of native SOD, better promoting the osteogenic differentiation of aged bone marrow mesenchymal stem cells. In a senile osteoporosis mouse model, the bone mineral density increment after treatment with utZIF-SOD is ≈2 times that of native SOD, achieving the reversal of senile osteoporosis. This work demonstrates the great promise in the synthesis of ultrasmall nanoformulations with ultrathin metal-organic framework coating and opens new avenues for efficient enzyme delivery.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Mian Zhu,Chao Lyu,Feng Dai,Jingxian Liu
To develop an environmentally friendly CO 2 capture technology, composite adsorbent beads were synthesized through the in situ growth of ZIF-8 in a nanocellulose gel scaffold prepared from pine needles-derived cellulose. The composite beads were subsequently functionalized with three ionic liquids ([BMIM][PF 6 ], [BMIM][BF 4 ], and [EMIM][TF 2 N]), which induced partial dissolution of the nanocellulose. This process resulted in the formation of unique wrinkled microstructures, resembling rice grains in morphology but exhibiting higher compressive strength. Notably, the IL-loaded CNF/ILs@ZIF-8 composites exhibited significantly superior adsorption performance over unmodified CNF@ZIF-8 (CZ) beads. Under static conditions (3 bar, 273 K), all three functionalized CNF/ILs@ZIF-8 variants enhanced CO 2 uptake capacities by > 46 %, with the [BMIM][PF 6 ] modified beads retaining 85.36 % of initial adsorption capacity after six adsorption–desorption cycles. Furthermore, under competitive dynamic adsorption (1 bar, 273 K), the [BMIM][BF 4 ] modified beads achieved a 43.12 % enhancement in CO 2 /N 2 selectivity compared to CZ. This work provides a MOF granulation strategy with process safety and environmental sustainability, potentially extending MOF applications in gas adsorption technologies.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Xinxiong Wang,Haojie Qiu,Zhongrun Xiang,Longxiang Tang,Huiqing Wang,Lei Xue,Xuefeng Yang
Due to the hyperglycemic environment, diabetic wounds are highly susceptible to bacterial infections, facilitating their progression to chronic, non-healing wounds. Consequently, there is an urgent need to develop wound dressings capable of reducing wound glucose levels and exerting strong antibacterial activities. In this study, a ZIF-8/Au-GOx (ZAG) nanozyme was grown in situ on fluffy chitin (FC) powder by integrating zeolitic imidazolate framework-8 (ZIF-8), glucose oxidase (GOx), and Au nanoparticles, leading to the development of a multifunctional wound dressing (FC/ZAG) for diabetic wound therapy. Benefiting from the cascade catalytic effect of the loaded ZAG nanozyme, FC/ZAG demonstrated a remarkable hypoglycemic activity and potent antibacterial properties. Additionally, owing to the biocompatibility of FC and the sustained release of Zn 2+ , the FC/ZAG powder exhibited a superior safety profile. In experiments in a mouse model of diabetic wound healing, FC/ZAG exerted significant anti-inflammatory and pro-angiogenic effects, accelerating the healing process of diabetic wounds. These findings highlight the high potential of FC/ZAG as a promising candidate for the development of advanced diabetic wound dressings.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jiayi Shan,Fei Ying,Linrui Li,Yubo Pan,Ziwen Shi,Jijia Liang,Yunfei Gao,Fengyun Wang,Mingzhu Xia
The development of high-efficiency adsorbents for addressing Pb(II) contamination in aquatic environments remains an urgent challenge in environmental remediation. This study presents a novel thiol-functionalized ZIF-8-based adsorbent (ZIF-8-TMT) with a stable 3D framework and abundant thiol groups, designed to overcome the limitations of conventional adsorption materials. The synthesized ZIF-8-TMT demonstrated a substantial BET surface area (456.58 m 2 /g) and numerous active adsorption sites, exhibiting exceptional Pb(II) adsorption capacity (494.9 mg/g) that surpassed most previously reported adsorbents. Systematic characterization revealed that the composite achieved rapid adsorption kinetics, with approximately 80 % removal efficiency within 30 min, and maintained excellent regenerability - showing negligible capacity reduction after three adsorption-desorption cycles and retaining over 60 % removal efficiency after five cycles. The adsorption mechanism was comprehensively investigated through Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and computational simulations including density functional theory (DFT), bond order density (BOD), and natural adaptive orbital (NAdO) analyses. Results indicated that the superior adsorption performance originated from synergistic effects between electrostatic interactions and dual coordination involving the N3 atoms in 2-methylimidazole ligands and thiol (-SH) groups from TMT. This study not only provides fundamental insights into the coordination chemistry of Pb(II) adsorption but also demonstrates the practical potential of ZIF-8-TMT for wastewater treatment applications, offering a promising solution for heavy metal pollution control with its combination of high capacity, rapid kinetics, and excellent reusability.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Xiaozhuo Liu,Lingxiao Li,Min Wang,Binbin Zhang
The design of superhydrophobic materials based on zeolite imidazolate frameworks (ZIF) has attracted considerable attention due to their exceptional chemical stability, high specific surface area, and environmental friendliness. However, research in the fields of anti-corrosion and anti-icing remains in its infancy, and the mechanical stability of reported ZIF-based superhydrophobic surfaces is generally poor. In this study, we synthesized ZIF-8@PDA materials in an aqueous system and followed with stearic acid (STA) modification to achieve low surface energy, resulting in ZIF-8@PDA@STA. Subsequently, we applied a spray-coating method to sequentially construct WPU and ZIF-8@PDA@STA layer on aluminum alloy substrates, achieving a ZIF-8@PDA@STA/WPU superhydrophobic coating with exceptional mechanical stability. This coating retained its superhydrophobicity even after 5600 cm of abrasion distance. Furthermore, results from surface wettability, electrochemical and anti-icing tests demonstrated that the coated aluminum alloy exhibited excellent interfacial non-wetting, self-cleaning, anti-fouling, and significantly enhanced corrosion resistance and delayed icing properties. Additionally, the facile preparation of this coating on various substrates facilitates the large-scale application of such materials. The construction of this multifunctional ZIF-8 based superhydrophobic coating is expected to greatly expand the application of ZIF materials across diverse fields.
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ACS Omega
·
2025
·
IF 4.3
Luna Wang,Yan Gong,Yanming Miao,Zhifeng Zhang
To support the development of a low-carbon economy and contribute to the achievement of carbon neutrality, this study synthesized bifunctional zeolitic imidazolate framework-8-based nanozymes (ZNZs) with dual functionality: CO2 adsorption and carbonic anhydrase (CA)-mimetic catalytic activity. The influence of ZNZs at varying concentrations on the growth rate of microalgae, chlorophyll and carbohydrate content, and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and CA activity were explored. Results indicated that after the addition of 5 mg/L ZNZs, the growth rate of microalgae increased by 7%. Furthermore, the maximum chlorophyll and carbohydrate contents reached 4.55 and 43.59 mg/L, respectively, which were 12.6 and 4.2% higher than those in the control group. Additionally, Rubisco and CA activity (intra- and extracellular) increased by up to 21.26, 10, and 8.3%, respectively. These findings demonstrate that ZNZs enhance the photosynthetic efficiency of microalgae and increase microalgae’s affinity for CO2, highlighting their promise as a strategy for improving carbon capture and sustainable bioenergy production.
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Chemosensors
·
2025
·Vol. 13
·期 9
·342
·
IF 3.7
Juncheng Chen,Caizhang Wu,Zhike Zhao,Ruihao Xue
An electrochemical aptamer sensor for the sensitive detection of aflatoxin B1(AFB1) in corn samples was developed using nanocomposites loaded with copper nanoparticles (CuNPs) on zeolitic imidazolate framework-8 (ZIF-8), which were modified on a glassy carbon electrode (GCE). The CuNPs@ZIF-8 nanocomposites served as modifying materials for electrodes, exhibiting a high specific surface area and excellent compatibility with aptamers, thereby enhancing the electron transfer rate and increasing the aptamer loading and immobilization efficiency. The electrochemical properties before and after modification were investigated and validated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques, while the sensor’s performance was analyzed through quantitative detection via differential pulse voltammetry (DPV). Furthermore, various conditions, including the volume of ZIF-8 dispersion, electrodeposition time of copper nanoparticles, aptamer concentration, and AFB1incubation time, were optimized. The results indicated that the sensor exhibited a wide linear range (10.0 to 1.0 × 106pg/mL), with a lower limit of detection (LOD) of 1.13 pg/mL under optimized conditions, outperforming other reported aptamer sensors. The spiked recoveries in corn samples ranged from 96.663% to 105.72%. In conclusion, this sensor presents a novel solution for low-cost and high-sensitivity detection of AFB1.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haibo Mao,Yuantao Chen,Wei Zhang,Chaoli Shao,Guodong Zhang,Shutian Liu
Galdieria sulphuraria (GS) show distinctive physiological traits For the removal of metal ions in aqueous solution, Algal powder have a limited capacity for uranium adsorption. This research institute introduces a innovative approach, The surface electronegativity of GS and the particle size of metal-organic framework (MOF) were modified. ZiF-8 was effectively synthesized on the surface of microalgae to adsorption of uranium (VI) from aqueous solutions. Improve the uranium adsorption capacity of microalgal biomaterials, Characterization analyses conducted using a microplate reader, SEM, XRD, FT-IR, and XPS collectively demonstrate the successful assembly of the MOF on the surface of GS and adsorption of uranium. The results of the adsorption experiments demonstrate that the adsorption capacity of microalgae self-assembly ZIF-8 is markedly superior to that of the unmodified microalgae. The material has the highest adsorption capacity at pH 5. The adsorption behavior aligns with the Sips isotherm model, with a maximum adsorption capacity of approximately 908 mg·g −1 . Kinetic experiments are accurately described by the pseudo-second-order model, The adsorption process is predominantly governed by chemisorption. The thermodynamic parameters (ΔG < 0,ΔH > 0) show that the adsorption process is spontaneous and endothermic in nature. The adsorption capacity exhibits an increase as the temperature rises. This material exhibits effective stability and maintains a high adsorption capacity after undergoing four consecutive adsorption cycles. Compared with inorganic materials, bio-inorganic hybrid materials exhibit Excellent potential for environmental compatibility.
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