RSC Advances
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2019
·Vol. 9
·期 60
·35189-35196
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IF 3.049
Yi-Wei Cui,Hai-Huan Zhang,Shi-Yong Yu
Efficient C–ZnS/ZnMoO4@MoS2 and C–ZnS/MoS2 nanocomposite photocatalysts, using ZIF-8 derived C–ZnO as a precursor were successfully synthesized using a simple one-pot procedure. This is the first application that involves transforming ZIF-8 into C–ZnMoO4 for photocatalysis. The C–ZnS/ZnMoO4@MoS2 and C–ZnS/MoS2 heterostructures were characterized by X-ray diffraction, UV-vis, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, photocurrent measurements, scanning electron microscopy and transmission electron microscopy. The ZM2 sample of C–ZnS/ZnMoO4@MoS2 exhibited enhanced photocatalytic activity of about 2.9 times as high as that of ZIF-8 derived C–ZnO in the reduction of tetracycline hydrochloride, and also showed obvious photocatalytic activity 1.81 and 3.33 times as high as that of a ZM3 sample of C–ZnS/MoS2 and ZIF-8 derived C–ZnO in the degradation of RhB, respectively. The improved photodegradation activity is a result of the heterogenous structure and the tighter contact between C–ZnS and C–ZnMoO4 compared with the physical contact of general heterogenous photocatalysts. The C–ZnS/ZnMoO4@MoS2 heterostructure photocatalyst is expected to be a new type of nanomaterial for the degradation of pollutants from wastewater.
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ANALYTICA CHIMICA ACTA
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2019
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IF 5.256
Kang Zou,Yamin Fu,Ruiying Yang,Xiaohua Zhang,Cuicui Du,Jinhua Chen
By direct calcination of Cu 2+ -doped ZIF-8 in oxygen atmosphere, a new photoelectric material, CuO–ZnO heterojunction , was prepared. The morphology and structure were investigated in detail by several methods, such as scanning electron microscopy, transmission electron microscopy , nitrogen adsorption-desorption method and X-ray diffraction. Under visible light irradiation , CuO–ZnO heterojunction exhibits excellent PEC behavior in aqueous media with the presence of ascorbic acid (AA) and dissolved oxygen at −0.3 V. Taking the CA125-antibody functionalized CuO–ZnO heterojunction (CuO–ZnO-Ab 2 ) as a signal source, a novel photoelectrochemical (PEC) immunosensing platform was developed for ultrasensitive assay of CA125. Because of the target-induced introduction of photoelectric material to the sensing platform, the proposed PEC immunosensor has excellent performance for CA125 assay: near-zero background noise, wide linear response range (1 × 10 −5 U/mL to 100 U/mL) and low detection limit (3.16 × 10 −6 U/mL). The developed CuO–ZnO heterojunction and the related PEC sensing platform may have promising applications in ultrasensitive and highly accurate monitoring of various proteins in bioanalysis and disease diagnosis.
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APPLIED CLAY SCIENCE
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2019
·
IF 3.89
Fengyi Wang,Zhiguang Guo
Waste water pollution containing heavy metal ions has raised wide concern in environmental sustainability, calling for the development of high-efficiency and low-cost materials for waste water treating. Herein, a series of carbon fiber/Co-Al layered double hydroxide/zeolitic imidazolate framework-8 (CF/LDH/ZIF-8) composites were synthesized and used for the high-efficiency elimination of toxic chromium Cr (VI) from aqueous solutions. The morphology, phase composition, phase structure of the CF/LDH/ZIF-8 composites were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and nitrogen adsorption-desorption methods, respectively. The LDH/ZIF-8 films on the CF showed a homogeneous micro/nano scale porous structure , which was composed of Co Al LDH nanoplates and ZIF-8 nanocrystals. The nanocomposites showed high specific surface area of 156.9 m 2 g −1 and pore diameters distributed almost in a narrow range of 2.5–8.3 nm when the molar ratio of Al 3+ /Co 2+ reached to 2:3. High-efficiency elimination of toxic chromium Cr (VI) by the CF/LDH/ZIF-8 composites was confirmed by the absorption test which showed the high absorption capacities of Cr (VI) (378 mg/g). With the presence of CF/LDH/ZIF-8 composites in solution, toxic chromium Cr (VI) can be removed quickly, and the removal efficiency approached 99.3% approximately. Further, the results of cyclic tests indicated that the hierarchical CF/LDH/ZIF-8 composites exhibit excellent cyclic stability and can be fast regenerated in NaOH at 25 °C, rendering a widely application in environmentally friendly and high efficiency material for waste water treatment .
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INDUSTRIAL CROPS AND PRODUCTS
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2025
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IF 6.2
Kuang Luo,Ao Chen,Yiting Liu,Jie Yang,Ning Cai,Jumei Li
Surface-enhanced Raman spectroscopy (SERS) has been perceived as a valuable tool in ensuring food safety due to its rapid and intuitive nature. In this study, we demonstrate a novel cellulose-ZIF-8-noble metal nanostructure as a SERS substrate for the analysis of pesticide residues in food. Cellulose nanocrystal (CNC) acting as a scaffold, we systematically integrate ZIF-8 and Ag nanoparticles to fabricate tailored necklace-like CNC/ZIF-8/Ag core/shell nanostructures. SERS analysis reveals the CNC/ZIF-8/Ag presents an high enhancement factor of 6.39 × 10 4 , a low limit of detection (LOD) of 10 −9 mol/L, and a relative standard deviation of 10.24 % across 20 substrate batches for 4-mercaptobenzoic acid, underscoring its robust sensitivity and reproducibility. Moreover, its utility extends to the quantification of diquat dibromide (DQ) in standard solutions and green tea leaves, showcasing LODs of 6.61 × 10 −9 mol/L and 6.76 × 10 −8 mol/L, respectively, thereby exhibiting promising capabilities for ultra-sensitive pesticide detection in food. The exceptional SERS property can be ascribed to the enriching properties of the porous ZIF-8 nanostructures. Significantly, when exposed to UV light, the CNC/ZIF-8/Ag nanostructures efficiently degrade DQ within 60 min. Furthermore, their practical reusability under UV light is proved by high SERS performance across five detection cycles. These results emphasize the immense potential of CNC/ZIF-8/Ag in SERS-based trace pesticide detection.
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ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Xuan Luo,Ruiying Zhu,Li Zhao,Xiaobo Gong,Lingrui Zhang,Lu Fan,Yong Liu
Tetracycline hydrochloride (TC) accumulates in large quantities in the water environment, causing a serious threat to human health and ecological environment safety. This research focused on developing cost-effective catalysts with high 2e - selectivity for electro-Fenton (EF) technology, a green pollution treatment method. Defective nitrogen-doped porous carbon (d-NPC) was prepared using the metal-organic framework as the precursor to achieve in-situ H 2 O 2 production and self-decomposition into high activity ·OH for degradation of TC combined with Co 2+ /Co 3+ . The d-NPC produced 172.1 mg L −1 H 2 O 2 within 120 min, and could degrade 96.4% of TC in EF system. The self-doped defects and graphite-nitrogen in d-NPC improved the oxygen reduction performance and increased the H 2 O 2 yield, while pyridine nitrogen could catalyze H 2 O 2 to generate ·OH. The possible pathway of TC degradation was also proposed. In this study, defective carbon materials were prepared by ball milling, which provided a new strategy for efficient in-situ H 2 O 2 production and the degradation of pollutants.
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Inorganic Chemistry Frontiers
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2024
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IF 6.1
Guiyuan Yang,Fangyuan Hu,Li-Li Cui,Meihong Fan,Xin Ge,Xingquan He,Wei Zhang,Tewodros Asefa
Sustainable electrochemical energy conversion and storage systems are expected to alleviate the energy shortages and environmental crisis that are currently facing the world. To bring the large-scale deployment of these energy systems to reality, the development of highly efficient, sustainable, and stable electrocatalysts is key. In this work, an electrocatalyst composed of homonuclear paired Fe sites coordinated onto N-doped carbon, labelled as Fe2–N–C-900, is reported. The material is synthesized by preparing, and then pyrolyzing at 900 °C, Fe(III)-tetrapyridinylporphyrin-modified zeolitic imidazolate framework-8 (ZIF-8). The electrocatalyst displays excellent activity for the oxygen reduction reaction (ORR), with an onset potential of 0.990 V vs. RHE, a positive half-wave potential of 0.869 V vs. RHE, and a limiting current density of 6.7 mA cm−2, which are all superior to those of the benchmark noble metal-based ORR catalyst Pt/C. This is attributed to its high-density of catalytically active Fe2–N6 sites, large electrochemically active surface area, and small charge transfer resistance. The electrocatalyst also functions well for the ORR on an air electrode in an aqueous zinc–air battery while showing high catalytic activity, remaining stable, and giving a peak power density of 166.3 mW cm−2. Its performance here, too, exceeds that of a Pt/C-based zinc–air battery.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Xunke Zhao,Kaihuan Nie,Fuyi Sun,Cheng Xie,Yanran Cheng,Yuanyuan Che
Nanofiltration holds promise for treating dyeing and printing wastewater on account of its key merits: low consumption, easy manipulation, and absence of secondary contamination. In this study, the fabrication of a uniform permselective ZIF-8@GO composite membrane in the alumina ceramic tube by the continuous flow combined with in situ self-assembly way was investigated. Subsequently, the properties of ZIF-8@GO membrane were examined in relation to reaction time, reaction temperature, flow rate, and GO concentration. Furthermore, the durability of the membrane was tested. It was observed that under optimal conditions, the rejection rate and permeation flux of methyl blue solutions remained essentially constant during 24 hours of continuous operation, with values of 98.39% and 38.27 L/(m 2 ·h·bar), respectively. This work aims to simplify and smoothly implement the industrialized production of MOF-based composite membranes and offers a potential solution for the low-cost and efficient treatment of organic dye wastewater in the printing and dyeing industry.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yifan Liu,Siyang Zhao,Chenggong Xu,Jinxia Huang,Zhiguang Guo
The complex wastewater contaminated with oil and organic dyes tremendously threatens ecological environment and human habitat. The single functional membrane separation technology is not qualified to deal with complex wastewater treatment. Therefore, it is necessary to develop multifunctional membrane materials possess the ability to both oil/water separation and organic dye adsorption. Hence, we develop a simple and environmental strategy to incorporate zeolitic imidazolate framework-8 (ZIF-8) as the nanomaterial adsorbents into superhydrophilic hydrogel coated PVDF membrane through in-situ growth and gained the anti-oil fouling and dye adsorption properties. The prepared tannic acid-poly(acrylamide- co -acrylic acid)-sodium alginate@ZIF-8 (TPS@ZIF-8) hydrogel coated PVDF membrane exhibited high oil-in-water emulsion separation efficiency of 99.77% after 10 cycles of separation and outstanding anti-oil fouling property that flux recover rate more than 96.86% in the continuous filtration experiment, owing to the strong hydration ability of TPS@ZIF-8 hydrogel coating. Moreover, the abundant adsorption active sites (including imidazole ring, –COO – , phenolic hydroxyl and benzene ring) consisted by ZIF-8 adsorbent and hydrophilic functional groups on the TPS@ZIF-8-PVDF improved the dye adsorption capacity and exhibited selective cationic dye adsorption with efficiency over 98.7% after multiple cycles of dye filtration adsorption test. The adsorption process of TPS@ZIF-8-PVDF membrane for methylene blue (MB) followed the pseudo-second-order kinetic model and Langmuir adsorption model. Incorporating the dye adsorption performance of ZIF-8 nanomaterials with underwater superoleophobic property of TPS hydrogel coated separation membrane, the prepared ZIF-8 composited hydrogel coated PVDF membrane could simultaneously separate the MB dyed oil-in-water emulsion mixtures and showed cycle performance stability (separation over 99.7%). Furthermore, TPS@ZIF-8-PVDF membrane could maintain the superwetting and dye adsorption properties in various chemical/mechanical environments and even friction test. This study offers new insights into the design of multifunctional superwetting hydrogel coated membrane for complex wastewater treatment and purification.
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Journal of Saudi Chemical Society
·
2024
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IF 5.8
Liang Guo,Shijin Zhou,Yanju Liu,Huaixia Yang,Mingsan Miao,Wei Gao
Herein, a sandwich electrochemical sensing strategy for aflatoxin b 1 (AFB 1 ) detection based on hybrid-nanoengineering was presented. First, Au nanoparticle was doped into zeolitic imidazolate framework-8 (ZIF-8) to form Au@ZIF-8 by in-situ growth method, followed by multi-walled carbon nanotubes (MWCNTs) addition to synthesize MWCNTs/Au@ZIF-8 via self-assembly. The structural “confinement effect” of ZIF-8 afforded a microenvironment for Au nanoparticles and SMCNTs in a certain spatial region, giving MWCNTs/Au@ZIF-8 excellent electrochemical property as the substrate material. In addition, Au-Pt bimetallic nanoparticle, which exhibited excellent stability and catalytic activity was loaded on the hollow cerium oxide (CeO 2 ) to form AuPt@CeO 2 nanoparticle through one-step aqueous phase reduction. Owning to its high surface-to-volume ratio, satisfied electron transfer efficiency and biocompatibility, massive toluidine blue (TB) and AFB 1 antibody (Ab) could be modified on the AuPt@CeO 2 to form AuPt@CeO 2 -Ab-TB, which acted as signal tag for the ultrasensitive assay of AFB 1 . The proposed electrochemical sensing system exhibited wide detection range (2 × 10 -5 − 20 ng/mL) and low detection limit (2.13 fg/mL), which has been successfully applied to AFB 1 determination in four real samples. The hybrid nanoengineering presented in this work is an active attempt to prepare high-performance substrate material and signal tag, which provides a new insight for the development of highly sensitive and specific electrochemical sensing systems.
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JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Xuyong Tian,Dawei Ji,Haowei Feng,Weijia Lin,Chunlei Wang,Liying Wei,Wei Shu,Changfa Xiao
In recent years, with the rapid development of new energy vehicles, the demand for lithium resources has been increasing sharply. Positively charged nanofiltration (NF) membranes can accurately separate magnesium ions (Mg 2+ ) and lithium ions (Li + ), which have become an important technology for extracting lithium resources from salt lakes. The introduction of intermediate layer in thin-film composite (TFC) NF membranes could improve the permeability and selectivity for Mg 2+ /Li + separation. However, there is a problem of poor bonding between the intermediate layer and the supporting membranes through the simple physical combination on the membrane surface. Inspired by the controlled growth of succulent plants, the positively charged PA/ZIF-8/PSF composite NF membranes with “multilayer interlocking” structure were prepared successfully based on ZIF-8 layer anchored constrained growth and further interfacial polymerization. The zinc ion ligands of ZIF-8 were pre-anchored on the PSFsolution to provide reaction sites, and the grown ZIF-8 nanoparticles were embedded in the PSFsupporting membrane surface layer. The embedded ZIF-8 nanoparticles can enhance the interface bonding between the PSFsupporting membranes and the ZIF-8 layer. Additionally, the confined growth method can solve the problems of ZIF-8 particle aggregation and poor dispersion. Compared with membranes without ZIF-8 layer, the prepared PA/M − 6 membrane had a high flux of 47.2 L m −2 h −1 , which was 1.82 times that of PA/M-0. Meanwhile, the Mg 2+ /Li + separation factor of the PA/ZIF-8/PSF composite NF membranes could reach 47.6. In particular, the prepared NF membranes exhibited good long-term stability for Mg 2+ /Li + separation.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Di Wu,Yilin Wang,Zhifang Liu,Caiyu Ge,Jiejun Li,Xinyi Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
Rifampicin (RFP) is an emerging environmental pollutant that exists in natural waters due to discharged from the medical and pharmaceutical industries, posing potential risks to aquatic life and human health. Developing highly sensitive detection techniques for RFP is essential for environmental monitoring and public health protection. In this work, Mn 2 O@Zn-NC was synthesized using in-situ growth and pyrolysis methods. Rod-like MnO 2 providing dispersed sites for the growth and crystallization of dodecahedral ZIF-8,with dodecahedral ZIF-8 tightly encapsulates MnO 2 . Additionally, the Zn-NC formed after high-temperature treatment effectively addresses the issue of poor conductivity in MnO 2 , which is conducive to the accurate display of RFP current signals. Using material of Mn 2 O@Zn-NC, a high-sensitivity electrochemical sensor was developed with a detection range of 0.040–100 µM and a limit of detection of 25 nM. This highly sensitive sensor can accurately detect RFP in environmental samples, with results comparable to those obtained using UV-Vis spectroscopy. This breakthrough electrochemical detector provides valuable opportunities for creating smart, efficient, and portable monitoring solutions.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuanchao Lu,Ruixin Xiong,Xingyu Lin,Liangxiao Zhang,Xianghe Meng,Zisheng Luo
Rapidly and sensitively evaluating the acid value (AV) of edible oils is significant to ensuring food quality and safety. Cesium lead bromide perovskite nanocrystals (CsPbBr3 NCs) are an effective candidate for AV detection; however, their instability restricts wide applications. Herein, CsPbBr3@ZIF-8 was prepared by confining and growing CsPbBr3 NCs in situ into zeolitic imidazolate framework-8 (ZIF-8) to improve the stability, and a fluorescence sensor was established to evaluate the AV of edible oils. The results present that CsPbBr3 NCs (below 5 nm) with excellent optical properties were confined and grown in situ in micropores and mesopores of ZIF-8. Meanwhile, CsPbBr3@ZIF-8 had better long-term storage, ultraviolet-irradiation, and water-exposure stabilities, compared with CsPbBr3 NCs. Given the fact that free fatty acids (the major contributor of AV) decrease the fluorescence of CsPbBr3 NCs, the fluorescence intensities of CsPbBr3@ZIF-8 were negative-linearly related to oil AV (R2 = 0.9902) in 0.04–6.00 mg of KOH/g with a 0.06 mg of KOH/g limit of detection. Besides, the practical AV recovery was 92–101% with an average relative standard deviation of 2%. Furthermore, the detection time was 20 min. The response mechanism revealed that free fatty acids could remove surface ligands and increase surface defects to prompt the aggregation of CsPbBr3 NCs and the formation of lattice fringe dislocations, inducing a decrease in the fluorescence. Thus, a stable, sensitive, reliable sensor was established to evaluate the AV of edible oils.
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