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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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Chunxia Yan,Shuai Jia,Jie Wei,Ziqiang Shao
Porous carbon aerogels derived from abundant biomass, which possess a unique structure, a high specific surface area and heteroatom doping, are a promising electrodes material for supercapacitors (SCs). In this study, an innovative hierarchical porous material comprising cobalt decorated porous carbons derived from cellulose nanofiber / graphene / Zn/Co ZIF carbon aerogels (CRZCs) has been successfully synthesized by directional freeze drying and carbonization methods. Cellulose nanofibers (CNFs) and graphene (rGO) layers play not only a supporting role, but also an internal storage site for electrolytes, contributing to the diffusion of electrolytes to the surface of active substances, at the same time enhance hydrophilicity of the aerogel and contribute to uniformly disperse Zn/Co ZIF. What's more important is that the carbon aerogels possess hierarchical porous involving micropores, mesopores and macropores, which further aid electrolyte penetration and ion storage. Furthermore, benefiting from the synergetic effect of hierarchical porous, high surface area, high conductivity, the prepared CRZC electrode obtains a high specific capacitance (364.6 F g −1 at 1 A g −1 ), an extraordinary capacitance retention rate (83.4 % at 10 A g −1 ). Simultaneously, the assembled supercapacitor by CRZC 900 exhibits a high specific capacitance (121.4 F g −1 at 0.5 A g −1 ), good charging/discharging rates, and remarkable cycling stability (78.9 % capacitance retention over 10000 cycles). The energy density up to 18.9 Wh kg −1 is achieved at power density of 288.4 W kg −1 , indicating its comprehensive applicability in energy storage. Finally, our results provide a general approach to construct hierarchical porous carbon aerogels for high-performance supercapacitors.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Qianshu Xia,Yun Hao,Suimin Deng,Lina Yang,Ruoxin Wang,Xiangfeng Wang,Yuan Liu,Hailing Liu,Mengxia Xie
s Water pollution induced by the productive process of organic dyes would lead to various diseases, and so treatment of the wastewater is an urgent task for protecting human health and ecological environment. In this work, visible light responsive heterojunction material based on silver iodide and carbon dots (CDs) doped ZIF-8 metal organic frameworks ( [email protected] @AgI) has been prepared by a green solvent-free strategy and in-situ ion deposition method. The [email protected] @AgI composites have high photocatalytic performance for degradation of acridine orange (AO) dye under visible light, and the maximum degradation percentage can reach to 96.0%, which was estimated by the UV–visible spectroscopy. The porous structure and large surface area of the photocatalyst were favorable to absorption of the target dye on the catalyst, which can promote the kinetic degradation rate for low level concentration of the dye. The introduction of CDs into the AgI heterojunction can improve the electron transport efficiency and visible light absorption capacity, and thus significantly enhancing the photocatalytic activity of the catalyst. The photocatalytic mechanism was proposed as indirect Z-scheme heterojunction type based on the energy band structure of the catalyst. This work provides a visible light photocatalyst for removal of the AO dye in wastewater and offers a promising strategy for developing photocatalyst for treatment of organic pollutants in the environment using solar energy.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
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IF 5.895
Chuanyu Yang,Peitong Yu,Ying Li,Junyang Wang,Xinyue Ma,Ni Liu,Ting Lv,Hongru Zheng,Han Wu,Hongxia Li,Chunyan Sun
Lead contamination has posed a potential threat to the environment and food safety, arousing extensive concern. In this work, we fabricated a novel fluorescent sensing platform based on zeolitic imidazolate framework-8 (ZIF-8) and DNAzyme for monitoring Pb2+ in water and fish samples. ZIF-8 was proposed as a fluorescence quencher with the advantages of simple synthesis, low cost, and high quenching efficiency. The Pb2+-dependent GR5 DNAzyme containing the large ssDNA loop can be adsorbed onto ZIF-8 accompanied by fluorescence quenching. Upon binding with Pb2+, GR5 DNAzyme was activated and cleaved, leading to the release of FAM-labeled 5-base ssDNA, which restored the fluorescence. The “turn-on” assay can detect Pb2+ through the one-pot procedure in the range of 0.01–10.0 nM with a detection limit of 7.1 pM. The platform is promising for on-site monitoring of Pb2+ owing to the excellent performance of high sensitivity, low background, strong anti-interference ability, and simple operation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yangchao Liu,Senqing Fan,Yu Chen,Jiaojiao Chen,Jiaxin Meng,Mingxia Yang,Chuang Li,Haijie Qing,Zeyi Xiao
A catalytic membrane nano reactor (CMNR) with two-dimensional channels has been fabricated by graphene oxide (GO) nanosheets with ZIF-67 derived Co 3 S 4 catalyst immobilized on. The characterization by X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron Spectroscopy (XPS) indicates the successful fabrication of Co 3 S 4 @GO nanosheets. The uniformly dispersed Co 3 S 4 nanoparticles immobilized on GO nanosheets in the range of 3–5 nm and the thickness of the CMNR is in the range of 206–1091 nm can be determined by Transmission electron microscope (TEM) and Scanning electron microscope (SEM), respectively. The catalytic performance of this CMNR has been evaluated by 4-nitrothiophenol (4-NTP) reduction under the flow-through mode. The 4-NTP conversion of over 99% can be achieved under the condition of membrane flux of being 144.4 L·m −2 ·h −1 . The uniformly dispersed Co 3 S 4 with small size and the confined two-dimensional channels with nano scale for enhanced mass transfer can be contributed to the good catalytic performance of this CMNR. High 4-NTP conversion and nice stability can be achieved for a long time by this CMNR under the condition of humic acid mixed in the reactant solution, since the CMNR is resistant to the poisoning of catalysts by humic acid.
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Journal of Energy Storage
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2022
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IF 8.907
Chunfeng Xue,Wei Zhao,Qian Zhang,Jinxin Wang,Yueyue Wei,Kai Lv,Teng Wu,Yu Lin,Xiaohong Li,Xiaogang Hao
Zeolitic imidazolate framework (ZIF) derived carbon generally suffers from a hydrophobic close-ended microstructure, leading to poor rate capability and low energy density in supercapacitors . In view of the defects, a facile strategy is demonstrated to synthesize open-door nanoporous carbon with self-doped heteroatoms by the pyrolysis of salt-filled ZIF-8. Specifically, inert NaCl is impregnated into the channels of ZIF-8 to inhibit framework shrinkage and promote the generation of open pore system . The resultant carbon CZ-900 features with O, N co-doped surface and specific surface area of 1420 m 2 ·g −1 . It exhibits a specific capacitance of 574.9 F·g −1 at 0.5 A·g −1 in aqueous electrolyte of 1.0 M H 2 SO 4 , which is higher than other carbons derived from ZIF-8. In the two-electrode system, it shows a high energy density up to 21.1 Wh·kg −1 at a power density of 211.3 W·kg −1 . The superior performances can be attributed to its integration of open-pore structure and N/O co-doped surface, which provides a fast ion-transport pathway, improved interface wettability, broadened operation potential and efficient faradic-activity.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Xinling Zhang,Ning Yuan,Shuo Xu,Yi Li,Qibao Wang
The removal of organic pollutants was examined by new zeolitic imidazolate framework-8/carboxyl-functionalized multi-walled carbon nanotubes (ZIF-8/MWCNTs-COOH) nanoadsorbents, which were prepared via controlling the reaction sequence of MWCNTs-COOH with the precursors of ZIF-8. Structural morphology and chemical composition characterizations confirmed the successful preparation of ZIF-8/MWCNTs-COOH nanoadsorbents. The obtained samples manifested a preferable adsorption capacity for Congo red with the maximum adsorption capacity of 1185.58 mg g −1 with an adsorption removal rate of 97.93% at equilibrium adsorption. Further analyses indicated that the adsorption process conformed to the pseudo-second-order kinetic model and Langmuir adsorption isotherm. The thermodynamic analyses were depicted as endothermic, entropy-increasing, and spontaneous. The effects of pH value, interfering ions, and dosage on the adsorption properties were systematically explored. The nanoadsorbent can be expediently reused for eight cycles without a prominent reduction in adsorption activity. The improved performance and high reusability can be ascribed to the increasing specific surface, the presence of electrostatic interaction, hydrogen bonding, and π–π interaction between ZIF-8/MWCNTs-COOH and organic molecules. In addition, the prepared composites also showed a better adsorption performance for tetracycline with the equilibrium adsorption capacity of 471.22 mg g −1 compared to pure ZIF-8 and MWCNTs-COOH.
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ENERGY & FUELS
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2022
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IF 4.654
Bin Liu,Songlin Xue,Shifeng Tan,Duxin Zhang,Zhao Deng,Hongfei Pan,Wenmao Tu,Ruiming Zhang,Haining Zhang,Yadong Wang
In this work, a two-step calcination method to fabricate Co3O4@CoP hollow nanoparticles embedded in N, S-co-doped reduced graphene oxide substrates is reported. The electrocatalyst is synthesized through a hydrothermal-calcination method of adding graphene oxide using ZIF-67 as a template followed by an annealing process in the presence of NaH2PO4·H2O. In the designed electrocatalyst, the formed hollow nanoparticles had an average diameter of 100 nm. The synthesized electrocatalyst displays a hydrogen evolution reaction overpotential of 54 mV at 10 mA cm–2 current density in 0.5 mol L–1 H2SO4 solution at room temperature, comparable to Pt/C catalysts. The oxygen evolution reaction overpotential in 1 mol L–1 KOH electrolyte is 288 mV, which is almost equivalent to that of IrO2. Stated thus, the as-prepared composite catalysts are promising candidates for bifunctional catalysts for water splitting technology, relieving the limitation of commercial catalysts caused by their single catalytic performance.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Jian Liu,Yingbi Chen,Yuting Hu,Yiting Zhang,Gengwei Zhang,Shixing Wang,Libo Zhang
A metal-organic framework (ZnO@ZIF-8) with great adsorption potential was developed using ZnO nanoparticles as a surface-active center and applied to lead removal from wastewater. The adsorption experiments were carried out and the related adsorption behaviors were investigated. The adsorbent shows excellent adsorption performance between pH 3–5. The maximum adsorption capacity of ZnO@ZIF-8 for Pb (II) was 689.36 mg/g at 303 K. The adsorptive process of Pb (II) onto ZnO@ZIF-8 conforms to the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamics illustrate that the adsorption process is chemical adsorption on a uniform surface. Selectivity experiments showed that ZnO@ZIF-8 had the strongest affinity with Pb (II). The adsorption-desorption cycle confirmed that ZnO@ZIF-8 was a reliable and recyclable adsorbent. XPS, Zeta potential and FT-IR analysis illustrate that the adsorption of Pb (II) by ZnO@ZIF-8 was concentrated in electrostatic adsorption and chelation. DFT calculation indicated that there are different types of Pb (II) combination mode (Pb-N and Pb-O) and the adsorption mainly depended on the chelation. This study presented herein played important roles in the governance of heavy metal waste-water pollution as a result of ZnO@ZIF-8 can effective selectivity cleanup of Pb (II).
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Chenghong Wu,Xiaopeng Chen,Jiawei Fu,Jiezhong Zou,Jiezhen Liang,Xiaojie Wei,Linlin Wang
The large-scale synthesis of transition metal catalysts with high performance and their catalytic mechanism for hydrogenation is of great importance for the development of a cost-effective alternative to noble metal catalysts. Herein, we report a facile and high-yield approach for the large-scale production of highly active Co/NCNTs catalyst transformed from zeolitic imidazolate frameworks (ZIFs). The precursor ZIF-67 could be easily prepared in an aqueous solution at room temperature in a short time (∼30 min) with a high space–time-yield. Followed by low-temperature (450 °C) pyrolysis, the Co/NCNTs catalyst was obtained in high yield. Benefiting from the high density and accessible active sites, Co/NCNTs-450 exhibits high activity in hydrogenation of aromatic hydrocarbon resin (AHCR) at 160 °C and 3 MPa (for the first time below 5 MPa), which was superior to the 5 wt% Pd/C. Furthermore, a combination of kinetic experiments and density functional theory (DFT) calculations were conducted to provide insight into the mechanism of AHCR hydrogenation. The 21 kinetic models based on the Eley-Rideal (ER) and Langmuir-Hinshelwood-Haugen-Watson (LHHW) formalism were proposed to describe the kinetic data obtained via elimination of the mass transfer limitations. On the basis of the model discrimination and regression results, the LHHW mechanism presented the best fit. And all the estimated kinetic parameters, including rate constants and activation energy, could be used in a reactor design for process scale-up. The DFT calculations further corroborated the kinetic modeling results that the surface reaction of chemisorbed AHCR and the dissociatively adsorbed hydrogen was the rate-determining step.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yaqi Zhang,Yaming Sun,Yong Man,Hang Yuan,Renyong Zhao,Guoqiang Xiang,Xiuming Jiang,Lijun He,Shusheng Zhang
The development of peroxymonosulfate (PMS) catalysts with sufficient active sites and high mass transfer capacity is a desirable but challenging aspect in advanced oxidation processes. In this work, an Fe/N-co-doped porous carbon (Fe/N-PC) material derived from silica-coated Fe-doped zeolitic imidazolate framework-8 (Fe-ZIF-8) was developed and used as catalyst for the degradation of aflatoxin B 1 (AFB 1 ). Fe-ZIF-8 introduced additional Fe-N sites with high catalytic PMS activity. Importantly, the strategy of silica coating on the surface of Fe-ZIF-8 effectively prevented the aggregation of catalyst particles during the pyrolysis process and introduced a hierarchical porous structure in Fe/N-PC, significantly improving the mass transfer of reactants on the catalyst. As a result, Fe/N-PC possessed a much higher adsorption capacity for AFB 1 (202.8 mg g −1 ) than other reported carbon adsorbents and exhibited fast degradation of AFB 1 with ultra-high removal efficiency (99.88%) within 30 min. Singlet oxygen ( 1 O 2 ) was proved to be the dominant reactive species for AFB 1 degradation. In addition, four degradation products were identified, and two possible degradation pathways were proposed. The double bond of the terminal furan ring or the methoxy group was destroyed, which implied that the toxicity of the degradation products was significantly reduced. Based on the above results, Fe/N-PC can be considered an efficient catalyst for the removal of hard-to-degrade AFB 1 in practical applications.
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Defence Technology
·
2022
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IF 4.035
Shi-bin Lu,Ying Meng,Hai-bo Wang,Xian-wei Jiang,Jin Yang,Ning Wei,Lin Jin,Li-juan Wan,Hao Tang,Qian-qian Hou
A porous 3D cross-linked conductive network pierced by multi-wall carbon nanotubes (MWCNTs) was successfully designed from zeolitic imidazolate framework-8 (ZIF-8). Zn@NPC@MWCNTs composites were tailored by the facile regulating the mass ratios and thermal annealing treatment. Due to the combination of less eddy current loss and dielectric loss together with multiple reflection attenuation caused by a unique structure. With a 10 wt% filler loading, the Zn@NPC@MWCNTs composites carbonized at 800 °C show two high reflection loss ( RL ) values with different thicknesses. An RL value is −53.18 dB with 4.09 mm thickness in the C-Band (4–8 GHz), and a minimum RL can reach −74.83 dB (10.8 GHz) with a matching thickness of 2.749 mm. The effective absorption bandwidth is 4 GHz (from 8 to 12 GHz, RL ≤ −10 dB), which just covers the full X-band. Low cost and easy preparation can also provide advantages to develop MOF-based materials as effective EMW absorbents.
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