SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Ning Sui,Yifeng Xu,Peng Zhang,Shuang Cao,Tingting Zhou,Tong Zhang
The crucial challenge to exploit effective ozone (O 3 ) gas sensors lies in developing novel functional sensing materials to meet the requirement of trace-level detection threshold (50 ppb). Metal oxide semiconductors (MOSs) with controllable heterogenous composites as high-performance sensing layers are expected to break through this bottleneck. This work proposes the hybridization of MIL-68 (In) and ZIF-8, which are employed as dual metal organic frameworks (MOFs) sacrificial templates to design n-n heterostructures . The derived In 2 O 3 backbone showed a hexagonal prismatic structure with a large aspect ratio. The robust architecture enabled the uniform decoration of mass of ZnO nanoparticles (NPs) on the surfaces without the damage of high porosity for the gas diffusion. Consequently, the optimal sensor with appropriate ZnO NPs loading amount exhibited trace O 3 detection ability as low as 15 ppb, which was attributed to the smart design of n-n heterostructure, rich active sites and improved oxygen-adsorbing capacity. Thus, this work inspires a new way to utilize the versatile dual MOFs template for constructing heterogenous composites as O 3 sensing materials.
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International Journal of Electrochemical Science
·
2023
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IF 1.5
Hui Yao,Wan-ting Zhang,Ting-yu Yan,Xiao-qin Li,Xiao-feng Wang
Metal-Organic Frameworks (MOFs) are promising materials in electrochemical sensor. Herein, Cu-doped zeolitic imidazolate framework (ZIF) was synthesized by hydrothermal method. The prepared composite was characterized by XRD, FTIR and SEM. Then the material was modified onto the surface of glass carbon electrode (GCE) with chitosan(CHIT) and Cytochrome C (cyt c ). The modified electrode showed good electrochemical activity toward the reduction of hydrogen peroxide (H 2 O 2 ). Under optimized conditions, the linear response of the sensor to H 2 O 2 ranges from 10～5200 μM, with a detection limit of 3.7 μM (S/N=3). Finally, the sensor was successfully applied to determine H 2 O 2 in water samples. Thus, the Cu-doped ZIF material has great potential for applications in electrochemical sensors.
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Progress in Natural Science-Materials International
·
2023
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IF 4.7
Siyi Wang,Yuxuan Bai,Zhixiong Zhang,Chengde Xie,Wenhui Song,Chen Wang,Zhuoyu Ji,Jianjun Wang
In this study, the one-dimensional nanomaterial α-MnO 2 @ZIF-8 was satisfactorily fabricated using a simple hydrothermal method by modifying ZIF-8 on α-MnO 2 nanowires for high-performance extraction of U(VI) out of water solution. The experimental data indicated that the adsorption of U(VI) on α-MnO 2 @ZIF-8 was intensely dependent on solution pH but not on ionic strength . The maximum adsorption of U(VI) on α-MnO 2 @ZIF-8 at pH = 5.0 and T = 298 K was 802.36 mg/g, substantially higher than the adsorption on α-MnO 2 (22.32 mg/g) or ZIF-8(551.31 mg/g) under the same conditions, indicating that the performance of the modified α-MnO 2 was greatly enhanced. Attaining adsorption equilibrium within 45 min, the analytical kinetic process of α-MnO 2 @ZIF-8 indicated that its adsorption on U(VI) was monolayer chemisorption . The adsorption experiments and XPS analyzed the possible adsorption mechanism of U(VI) in the reaction with α-MnO 2 @ZIF-8 during the adsorption process , namely intra-sphere surface complexation, chemisorption and electrostatic interaction . The simple preparation and high removal efficiency of α-MnO 2 @ZIF-8 indicated that this adsorbent had good prospects for application in wastewater.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Chunmei Gao,Peng Zou,Shifeng Ji,Yunqing Xing,Jiaonan Cai,Jinjian Wu,Tianyang Wu
Herein, we report a preparation method based on a modified zeolite imidazolate skeleton loose nanofiltration membrane used to achieve the efficient separation of salt and dye from dye wastewater. In this study, negatively charged hydrophilic TA@ZIF-8 was synthesized using a tannin surface-functionalization-assisted etching process by tannic acid (TA). A novel, highly negatively charged, and loose nanofiltration membrane was then prepared by adding TA@ZIF-8 to a polyethyleneimine (PEI) and tricarboxylic acid (TMA) crosslinking system. The addition of TA@ZIF-8 nanoparticles not only changed the degree of crosslinking of PEI/TMA but also provided a preferential channel for water molecules, thereby improving the flux of the membrane. Then, the success of TA@ZIF-8 NPs and membranes preparation were verified by SEM, XRD, FT-IR, TGA , BET, XPS and other methods. The results showed that the optimal preparation conditions were 0.020 wt% TA@ZIF-8 loading, and the contact angle of the membranes decreased from 79.8° to 53.7°. The water flux of the membrane is 81 L·m −2 ·h −1 ·bar −1 , which is 1.5 times that of PEI/TMA membrane. In addition, TA@ZIF-8–2 membrane not only has high rejection rate for Methyl blue (98.7 %), Toluidine blue (89.6 %), Cr 6+ (91.2 %), but also maintains high transmittance for NaCl and Na 2 SO 4 . Besides, the separation performance of the membrane was stable for a long time in a mixed solution of dye and salt and excellent antifouling performance. Therefore, the loose TA@ZIF-8/PEI/TMA nanofiltration membrane has broad application prospects in printing and dyeing wastewater treatments .
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Yue Zhao,Rui Gao,He Wang,Yanping Sun,Xiaohui Zhan,Lei Chen,Junyan Liu,Huixiang Shi
The adsorption and protective calcination methods were combined to synthesize single Mn atoms catalyst with more Mn-N x exposure for peroxymonosulfate (PMS) activation. During the carbonization process, the surface adsorbed Mn species in zeolitic imidazolate framework-8 (ZIF-8) and the surrounding graphitic carbon nitride (g-C 3 N 4 ) jointly maintained the morphology of precursor and enriched Mn-N 6 sites near the catalyst surface. The hollow and hierarchically porous structures induced by the erosive function of g-C 3 N 4 further facilitated the exposure of Mn-N 6 sites and mass transfer processes. Herein, the derived hollow carbon polyhedron catalyst (C-Z8-Mn@g-C 3 N 4 ) possessed highly accessible edge-host Mn-N 6 sites and ultra-high specific surface area (1846.91 m 2 g −1 ). C-Z8-Mn@g-C 3 N 4 exhibited remarkable catalysis for sulfamethoxazole (SMX) degradation at an extremely low dosage (0.01 g L −1 ), particularly, up to 3.8 times of promotion was obtained compared to traditional single Mn atoms catalyst (66.9 vs 17.8 L g −1 min −1 ). Besides, the catalytic performance of C-Z8-Mn@g-C 3 N 4 was not obviously affected by initial pH (3.14–11.00), inorganic anions and natural organic matters (NOMs). Experiments and Density functional theory (DFT) calculations revealed that Mn-N 6 sites not only had stronger PMS adsorption capacity than graphitic N, but also enhanced the electron transfer between catalyst and PMS, thus promoting the redox and self-decomposition of PMS to produce SO 4 − , OH and singlet oxygen ( 1 O 2 ) (as major active oxygen species). This work provides new insights into the regulation of active sites exposure in single-atom catalysts for enhanced catalytic performance.
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International Journal of Electrochemical Science
·
2023
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IF 1.5
Juan Liu,Wenju Weng,Chunxiao Yin,Guiling Luo,Hui Xie,Yanyan Niu,Xiaoyan Li,Guangjiu Li,Yaru Xi,Yutong Gong,Shuyao Zhang,Wei Sun
In this paper zinc-based metal organic framework material (ZIF-8) modified carbon ionic liquid electrode (CILE) was prepared and electrodeposited with gold nanoparticles to get a composite modified electrode, which was used as the sensing interface for the immobilization of hemoglobin (Hb) with Nafion to prepare a modified electrode (Nafion/Hb/Au/ZIF-8/CILE). Electrochemical behaviors of Hb on the modified electrode were checked by cyclic voltammetry with a pair of well-defined redox peaks appeared. The effects of pH and scan rate on direct electrochemistry of Hb were studied with electrochemical parameters calculated. The prepared electrochemical enzyme sensor showed good catalytic activity to the electroreduction of bromate and nitrite with the linear ranges from 0.5 to 10.0 mmol/L and from 0.1 to 0.8 mmol/L, respectively. The detection limits were calculated as 0.83 mmol/L and 0.03 mmol/L, and the water samples were analyzed to prove the practical application.
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FOOD HYDROCOLLOIDS
·
2023
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IF 10.7
Mengjun Wang,Linyu Nian,Jiaoyang Wu,Shujie Cheng,Zhiping Yang,Chongjiang Cao
The deterioration of postharvest fruits and vegetables caused by ethylene and microorganisms leads to global resource waste. Therefore, the development of multifunctional packaging materials that scavenge ethylene and inhibit microorganisms is essential to extend the shelf life of fruits and vegetables and minimize waste. Herein, the excellent photocatalytic performance of [email protected] nanoparticles (NPs) was incorporated into chitosan (CS) and sodium alginate (SA) matrix by layer-by-layer (LBL) assembly method to obtain CS/SA/ [email protected] nanocomposite films. These as-prepared films exhibited excellent antibacterial (antibacterial ratio >99%) and ethylene scavenging properties (scavenging ratio >40%) due to the synergistic effect between visible light-induced reactive oxygen species (ROS) and the higher specific surface area of ZIF-8. The extended shelf life of kiwifruit further confirmed the enhanced preservation performance of CS/SA/ [email protected] nanocomposite films. In addition, with the addition of [email protected] NPs, the color, and transparency of the films decreased, but the mechanical strength, thermal stability, hydrophobicity, and barrier properties were improved. In summary, the successful construction of ethylene scavenging and antibacterial films provides new ideas for the innovation of environmentally adaptive and functionalization of films.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Yanan Li,Tingting Fan,Wenying Cui,Xia Wang,Seeram Ramakrishna,YunZe Long
Efficient treatment organic pollutants and oily wastewater with high toxicity under harsh environment is eagerly desired, while conventional membranes cannot meet the demand due to its poor chemical resistance which still remains a great challenge. Herein, biomimic polytetrafluoroethylene (PTFE) @ zeolite imidazole framework (ZIF-8) fibrous membrane for efficient photocatalytic organic pollutants degradation and oil-water separation under harsh environments was successfully developed, via electrospun PTFE nanofibrous membrane with numerous micro-nano rough papillae followed by in situ growth highly porous ZIF-8. The high surface area PTFE@ZIF-8 membrane with lotus-leaf-like structure exhibits excellent photocatalytic degradation performance to organic pollutants such as dyes (methylene blue and rhodamine B) and antibiotics (tetracycline) in harsh environments (strong acids/bases) with a remarkable high removal efficiency (99.99%). Meanwhile, the fluorinated PTFE@ZIF-8 membranes with super-hydrophobicity and super-lipophilicity property also exhibit outstanding oil/water separation performance (chloroform, kerosene, dichloromethane, toluene and n-hexane), with an extremely high flux of 2157 L m −2 h −1 (dichloromethane/water) and separation efficiency of 99.99% (kerosene/water). Furthermore, the membrane also able to separate water-in-oil emulsions effectively with an efficiency of as high as 99.99%. Most importantly, the robust PTFE@ZIF-8 membrane possesses excellent corrosion resistance, self-cleaning and recycling properties, which could still maintain such high separation efficiency and flux even after more than 10 cyclic oil-water separation tests under harsh environments. The multifunctional membrane with excellent harsh environment-tolerance offers an inspired strategy for efficient wastewater treatment under complex conditions and shows great potential for practical applications.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Yuhan Cui,Chunyan Zhao,Lijie Zhao,Xiaohong Zhang,Jianxin Wang
As a new environment-friendly energy storage system between traditional capacitors and lithium-ion batteries, supercapacitors have many excellent characteristics compared with other energy storage devices. The new electrode material is the key component to determine the performance of the supercapacitor. Combined with the relevant literature reports of researchers in recent years, the structure and properties of Co, Zn, Ni and other materials were introduced, and the preparation method of Co–Zn as electrode material was sorted out. The rGO/Zn 0.773 Co 0.227 S composites were prepared by a simple template method to analyze the structure and morphology, and rGO/Zn 0.773 Co 0.227 S was treated to make it a paste adhering to nickel foam. Benefiting from the synergistic effect between Zn 0.773 Co 0.227 S and rGO , the composite provides significantly improved energy storage capability in a three-electrode system. The specific capacitance can reach 1680 F g −1 at the current density of 1 A g −1 . When the current density is increased to 10A g −1 , the specific capacitance still reaches 895.4 F g −1 , and the loss of the specific capacitance is only 22.2% after 5000 cycles at 10 A g −1 . When rGO/Zn 0.773 Co 0.227 S is used as cathode material and AC as negative material, asymmetric supercapacitor also has good cycle stability and high energy density .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Yaqi Zhang,Linli Tan,Na Han,Shiwei Tian,Wei Li,Wei Wang,Yutong Wu,Zhongshun Sun,Xingxiang Zhang
The separation of oil-in-water and water-in-oil emulsions with high efficiency and environmental friendly remains a challenge in the past decade. This work describes a new method to improve the trade-off of the poly(acrylonitrile- co -methyl acrylate) (P(AN-MA))-based membrane for water/oil separation. P(AN-MA) microfiltration (MF) membrane was fabricated via thermally induced phase separation (TIPS) method in this study. Then, some of the –CN groups and –COOCH 3 groups were converted to –COOH groups via hydrolyzing. Finally, the selected wettability was attained by grafting PEI on one side while ZIF-8 was anchored to the other side via self-assembly and in-situ interfacial reaction methods. The ZIF-8/P(AN-MA) hybrid MF membranes are superoleophobic underwater on the PEI side while super-hydrophobic under oil on the ZIF-8 side, which can efficiently and accurately separate oil-in-water and water-in-oil emulsions at a low pressure (0.01 MPa). The separation fluxes of the PEI side were as high as 3053 L/m 2 h and 1035 L/m 2 h respectively, for the surfactant-free mixtures and surfactant-stabilized emulsions. For water-in-oil emulsions, the fluxes were up to 2316 L/m 2 and 878 L/m 2 h on the ZIF-8 side, respectively. The separation efficiency of all the mixtures and emulsions was higher than 97.5 %. Moreover, the Janus membranes showed excellent anti-oil-fouling and anti-water-fouling properties on the two sides of the membranes, as well as remarkable durability during the 10 cycles in oil/water separation. Hence, Janus ZIF-8/P(AN-MA) hybrid MF membranes show potential application prospects in oil/water separation.
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ANALYTICAL CHEMISTRY
·
2022
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IF 8.008
Lancheng Wang,Mingjie Xu,Huimin Zhou,Kun Yan,Shiqi Duan,Dandan Xue,Youmei Wang,Bin Di,Chi Hu
The target of typical PCR analysis is restricted to nucleic acids. To this end, we report here a novel strategy to simultaneously detect genetic and metabolic markers using commercial PCR kits with cucurbit[8]urils (CB[8]) implemented to manipulate the activity of Taq DNA polymerase. CB[8] binds with the nonionic surfactants and displaces them from the polymerase surface, resulting in decreased enzyme activity. Meanwhile, the inhibited enzyme can be reversibly activated when spermine, the downstream metabolite of ornithine decarboxylase (ODC), is present in the sample, which competitively binds to CB[8] and recovers polymerase activity. CB[8] was implemented in conventional PCR kits not only to reduce false-positive results but also to extend the detection range of PCR technology. With this novel method to detect ODC in cell lysates containing both the nucleotides and intracellular metabolites, positive results were only observed in highly active HEK 293T cells, whereas silent cells treated with ODC inhibitor showed negative readouts, therefore providing a simple but elegant dual-modality PCR method for precision diagnosis.
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PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 43
·435101
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IF 3.953
Meng Lan,Zhaodi Kong,Fengjie Liu,Tengteng Zou,Lihong Li,Tiange Cai,Huaqin Tian,Yu Cai
Abnormal apoptosis can lead to uncontrolled cell growth, aberrant homeostasis or the accumulation of mutations. Therapeutic agents that re-establish the normal functions of apoptotic signaling pathways offer an attractive strategy for the treatment of breast cancer. Baicalin (BA) is one of the natural compounds with anti-proliferation and pro-apoptosis activities against numerous tumor cells. However, low bioavailability restricts the clinical application of BA. In order to improve its therapeutic efficacy and study the mechanism of actions, active targeting delivery systems were developed for targeting tumor environment and selective cell killing effects. It emphasized on the construction of folate-conjugated albumin nanoparticles loaded with baicalin (FA-BSANPs/BA) and mechanisms of which on the promotion of breast cancer apoptosis. The physicochemical properties and structural characteristics of FA-BSANPs/BA were investigated. Cell experiments were carried out to study the targeted anti-breast cancer effects of FA-BSANPs/BA and its mechanism. The results showed that FA-BSANPs/BA was successfully constructed with stable structural characteristics and sustained release effects. Cellular uptake and MTT showed that it increased targeted uptake efficiency and cytotoxicity. Flow cytometry and western blot confirmed that it promoted apoptosis by increasing the expression of caspase-8 and ROS, and decreasing the level of Bid. It is suggested that the pro-apoptotic mechanism of FA-BSANPs/BA is related to regulation of key proteins in extrinsic apoptotic pathway. In conclusion, FA-BSANPs/BA is a good delivery carrier and significantly inhibits the breast cancer growth compared with free BA. The mechanism of FA-BSANPs/BA promoting apoptosis of breast cancer may be due to its action on the caspase-8/Bid/ROS pathway.
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