ANALYST
·
2022
·Vol. 147
·期 17
·3867-3875
·
IF 5.227
Fangfang Yu,Yihan Wang,Tengfei Liu,Xiaohui Liu,Hui Jiang,Xuemei Wang
Hypochlorite plays a vital role in biological systems and our daily life. The rapid and convenient detection of hypochlorite is imperative and significant for disease treatment and human health. In this work, EY/UiO-66-NH2 (EY = eosin Y) was prepared through a hydrothermal process and could be applied to the detection and bioimaging of hypochlorite as a self-calibrating sensing nanoprobe. EY/UiO-66-NH2 features two emissions at 432 nm and 533 nm, and the emission intensity of 533 nm is enhanced with increasing ClO− concentration. EY/UiO-66-NH2 could be utilized as a ratiometric fluorescence sensor of ClO−. The linear range of EY/UiO-66-NH2 towards ClO− is 0.1–200 μM and its detection limit is 46.4 nM. In comparison with previously reported probes for ClO−, EY/UiO-66-NH2 has the advantages of a wide linear range, low detection limit, turn-on fluorescence and ratiometric response. This work provides a new method for ClO− detection in living cells.
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PubMed
高影响因子
TALANTA
·
2022
·
IF 6.556
Yi Wu,Keren Lu,Fubin Pei,Yanghao Yan,Shasha Feng,Qingli Hao,Mingzhu Xia,Wu Lei
The wide clinical application of d -penicillamine (D-PA) makes it inevitably accumulates in the environment, seriously threatening human health and the ecological environment. To better supervisory control D-PA, a highly sensitive and reliable photoelectrochemical (PEC) sensor based on gold nanoparticles (Au NPs) loaded on graphitic carbon nitride sheet and hexagonal NH 2 -UiO-66 composite (g-C 3 N 4 /Au/NH 2 -UiO-66) was synthesized. Tactfully using the strong bonding between D-PA and Au NPs and the effective carrier separation of Z-scheme heterojunction, the designed g-C 3 N 4 /Au/NH 2 -UiO-66 PEC sensor without an extra recognition unit exhibited a selective and sensitive photocurrent to D-PA. With the aid of UV diffuse reflectance spectra (UV-DRs), electron paramagnetic resonance (EPR) characterization, and free radical capture experiments, the electron transfer path of the PEC sensing system was deduced. The proposed g-C 3 N 4 /Au/NH 2 -UiO-66 PEC-based sensor achieved a low detection limit of 0.0046 μM (S/N = 3) with a wide linear response ranging from 10 nM to 400 μM. In addition, its good stability and selectivity also laid a good foundation for practical applications.
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ADVANCES IN POLYMER TECHNOLOGY
·
2022
·
IF 2.502
Qing-Chun Chen,Yu Bang,Lu Li,Hui-Yu Deng
Owing to the specific porous structure which could provide additional passage channel for some molecules, metal organic frameworks are attractive candidates for enhancing permeability and selectivity of membranes in pervaporation, reverse osmosis, and gas separation. In this experiment, Ag@UiO-66-NH2 was introduced into polyamide separation layer by interfacial polymerization of triethylenetetramine and 1,3,5-benzenetricarboxylic acid chloride for nanofiltration. The results indicated that Ag@UiO-66-NH2 nanoparticles did endow the membranes with rapid diffusion pathways for water molecules. When the content of Ag@UiO-66-NH2 was 0.03 g, the prepared membrane (NF-Ag-3) showed high flux about 47.3 L·m-2·h-1 at 0.6 MPa, which is about 2-fold higher than that of polyamide membrane without Ag@UiO-66-NH2, while the MgSO4 rejection rate remained about 87.4%. The membrane also showed excellent antifouling properties, and the water flux recovery ratio was 95.6% after filtration BSA solution. When it was applied for 50 mg/L bisphenol A removal, the rejection rate reached 94.6%, and the flux is about 49.1 L·m-2·h-1. Moreover, Ag particles on UiO-66-NH2 rendered the membrane with good inhibition for Escherichia coli. The antibacterial rate of the membranes is above 95% when the loading of Ag@UiO-66-NH2 is more than 0.03 g.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Shiwei Tian,Yaqi Zhang,Qiankun Sha,Tian Yang,Yan Huang,Xingxiang Zhang,Wei Wang,Na Han
Highly efficient treatment of oil-water emulsions in severe environments (organic solvents, strong acids) is recognized as a challenging subject. Polyphenylene sulfide (PPS) is an ideal membrane material with superior thermal stability as well as chemical resistance that is expected to settle this challenge. However, the hydrophobicity of PPS (h-PPS) membrane inherently prevents its efficient treatment of oil-in-water (O/W) emulsions. In this study, superhydrophilic modification of PPS substrates was achieved by in situ electrostatic self-assembly of hydrophilic Zr-MOFs to obtain UiO-66-NH 2 @h-PPS membranes. The introduction of UiO-66-NH 2 crystals constructed the micro/nanoscale hierarchical structure for the substrate, which transforms the PPS substrate from a hydrophobic to a superhydrophilic state (water droplets require only 0.6 s to be completely immersed in the membrane). Meanwhile, the UiO-66-NH 2 @h-PPS membranes gain under-water superhydrophobicity (the under-water oil contact angle exceeds 150° for toluene, hexane , dichloromethane , and carbon tetrachloride , of which toluene reaches 163.1°), thereby improving wettability selectivity and decreasing oil adhesion, permitting the fabricated UiO-66-NH 2 @h-PPS membranes to effectively separate different types of O/W emulsions. The UiO-66-NH 2 @h-PPS membranes acquire excellent permeate fluxes (for the surfactant-free toluene-in-water emulsion, it reaches up to 7638.1 L m −2 h −1 ) and separation accuracy (99.1% oil rejection). Moreover, the UiO-66-NH 2 @h-PPS membrane exhibited outstanding harsh environment resistance. Interestingly, the combination of UiO-66-NH 2 and h-PPS substrate was applicable to degrade the organic compound in water, and the degradation efficiency of the methylene blue achieved 85.7% under visible light within 120 min. In summary, loading Zr-MOFs onto h-PPS substrates provides a novel strategy for the efficient treatment of wastewater under complex conditions with great potential for practical applications.
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Catalysts
·
2023
·Vol. 13
·期 5
·817
·
IF 3.9
Haoyu Yuan,Chao Zhang,Wenjing Chen,Yuzhou Xia,Lu Chen,Renkun Huang,Ruiru Si,Ruowen Liang
Metal–organic frameworks (MOFs) are new porous materials composed of metal centers and organic ligand bridges, which received great attention in the field of photocatalysis. In this work, Ag2CrO4@MIL–125(Ti)–NH2(denoted as AgCr@M125) Z–scheme heterojunctions were synthesized via a simple microemulsion method, by which highly dispersed nano–sized Ag2CrO4can be anchored uniformly on the surfaces of porous MIL–125(Ti)–NH2(denoted as M125). Compared with pure M125 and Ag2CrO4, the as–prepared AgCr@M125 hybrids show significant photocatalytic efficiency against inactivatedStaphylococcus aureus(S. aureus), reaching over 97% inactivation of the bacteria after 15 min of visible light irradiation. Notably, the photocatalytic activity of the obtained 20%AgCr@M125 is about 1.75 times higher than that of AgCr–M125, which was prepared via a traditional precipitation method. The enhanced photocatalytic antibacterial activity of the AgCr@M125 photocatalytic system is strongly ascribed to a direct Z–scheme mechanism, which can be carefully discussed based on energy band positions and time–dependent electron spin response (ESR) experiments. Our work highlights a simple way to enhance the antibacterial effect by coupling with Ag2CrO4and M125 via a microemulsion–assisted strategy and affords an ideal example for developing MOFs–based Z–scheme photocatalysts with excellent photoactivity.Keywords:MIL–125(Ti)–NH2;Ag2CrO4;S. aureus;Z–scheme;microemulsion method
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CHEMOSPHERE
·
2021
·
IF 7.086
Zhihui Chen,Jun Yao,Bo Ma,Bang Liu,Jonghyok Kim,Hao Li,Xiaozhe Zhu,Chenchen Zhao,Meseret Amde
The presence of chlorophenols in water and wastewater is considered a serious environmental issue . To eliminate these micropollutants, biodegradation of chlorophenols using enzyme-nanoparticle conjugated biocatalyst, is proposed as an economical and eco-friendly method. Herein, amino-functionalized superparamagnetic Fe 3 O 4 @SiO 2 –NH 2 nanoparticles with core-shell structure were constructed as a promising carrier for immobilization of laccase from Trametes versicolor . Compared with free laccase, Fe 3 O 4 @SiO 2 –NH 2 -Laccase displayed remarkable outcomes in all major areas such as temperature and storage stabilities, and tolerance to organic solvents and metal ions . The biocatalytic performance and reusability of Fe 3 O 4 @SiO 2 –NH 2 -Laccase were evaluated for the degradation of 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) in repeated cycles. Even after 10 successive reuses, the degradation rate of 2,4-DCP and 2,4,6-TCP were found to be 54.9% and 68.7%, respectively. The influences of solution pH, initial chlorophenol concentration, and temperature on the degradation rate of these two chlorophenols were evaluated. The degradation intermediate products including dimers, trimers , and tetramers of 2,4-DCP and 2,4,6-TCP were identified. Release of chloride ions was observed during the enzymatic degradation of these two chlorophenols. Based on the determination of intermediate products and released chloride ions, the degradation pathway that was involved in dehydrogenation , reactive radical intermediates formation, dechlorination , self-coupling and oligomers/polymers formation was proposed. The toxicity of these two chlorophenols and their intermediates was substantially reduced during the enzymatic degradation. The results of this study might present an alternative clean biotechnology for the remediation of 2,4-DCP and 2,4,6-TCP contaminated water matrices.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bo Xue,Chuanruo Yang,Miao Chang,Dahuan Liu
The development of a green, efficient, and reusable photocatalyst is of great importance for pollution remediation. Herein, a series of core-shell ZIF-8@NH 2 -MIL-125 composites (ZM-X) were prepared by epitaxial growth method. The in-situ homogeneous encapsulation of NH 2 -MIL-125 by ZIF-8 was achieved through the structural modulation, and the formed core-shell architecture exhibited outstanding synergistic effect of adsorption and photocatalysis for eliminating tetracycline hydrochloride (TCH), which dramatically enhanced the photocatalytic reaction rate. The results show that the TCH adsorption capacity of optimized ZIF-8@NH 2 -MIL-125 (ZM-2) is 70.25 mg g –1 , which can be fitted well the pseudo-second-order and Langmuir isotherm modes. Under 100 min of visible light irradiation, the ZM-2 has the best synergistic removal rate on TCH (92.9%) compared with other samples, which is 6.5 times higher than of pristine NH 2 -MIL-125 (14.3%). The results of quenching experiments and ESR analysis clearly demonstrate that the superoxide radical ( · O 2 – ) dominates the TCH photodegradation reaction. In addition, ZM-2 can effectively remove TCH in different types of water systems (e.g., ultrapure water, tap water, lake water and actual pharmaceutical wastewater) through adsorption-photocatalytic synergy. Therefore, the novel core-shell material designed in this study has significant potential for environmental purification applications.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiaohu Ma,Congcong Lv,Peiyu Jiang,Jingbo Geng,Yanli Guo,Yu Zhang,Yuchuan Liu,Yan Jin,Baoxin Li,Wei Liu
The trace acetone determination in breath can be regarded as a noninvasive method for diagnostic of diabetes. There is an urgent demand to develop a simple method for acetone detection which can be easily performed at home. Here, UiO-66-NH 2 @PEI with the appropriate aperture size combined with the hand-held sensor was used to construct the adsorption–desorption sensing platform for separation and enrichment of acetone in exhaled breath (EB). UiO-66-NH 2 @PEI can realize the selective adsorption, desorption and separation for acetone in EB. The flameless combustion hand-held sensor can sensitively respond to acetone in the range of 0.2–12.0 ppm and it can achieve the accurate determination of acetone content in EB of diabetic patients. The hand-held sensor is inexpensive, lightweight and easy to operate, which has great application prospects for the widespread use for diabetic patients in family life.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhenhua Hou,Libo Wang,Gang Liu,Ya Wang,Yuhan Wang,Yangyang Zhang,Xiayu Wu,Nan Li
Ammonia has important application value in agriculture and industry as a raw material for producing nitrogen fertilizers and organic chemicals. The Haber-Bosch method is generally utilized to synthesize ammonia through N 2 and H 2 as raw materials in industry, but the process generates serious energy consumption and pollution. In the paper, a heterojunction catalyst is constructed that adopts NH 2 -MIL-125 and Fe-doped W 18 O 49 (Fe-W 18 O 49 ) for photocatalytic nitrogen fixation. Fe-W 18 O 49 is a nanowire containing oxygen vacancies (OVs). OVs can provide active sites for the adsorption and activation of nitrogen gas. The 3D plate-like morphology of NH 2 -MIL-125 can observably reduce the occurrence of nanowires aggregation. This phenomenon can be attributed to NH 2 -MIL-125 playing a supporting role in the fixation of nanowires. New mesoporous are formed between NH 2 -MIL-125 and Fe-W 18 O 49 in the constructed compound catalyst, which can realize efficient mass transfer between the inside and outside of the catalyst. EPR characterization discovers that Fe-W 18 O 49 /NH 2 -MIL-125 cannot produce •O 2 ˗ and •OH radicals. The type II heterojunction forms between Fe-W 18 O 49 and NH 2 -MIL-125. The heterojunction improves the carrier migration path, and the photocurrent intensity is significantly increased. Under simulated sunlight, Fe-W 18 O 49 /NH 2 -MIL-125–2 emerges the best catalytic performance with an ammonia formation rate of 128.2 µmol g −1 h −1 . The yield of ammonia is boosted in comparing with NH 2 -MIL-125 (13 times) and Fe-W 18 O 49 (1.7 times). After several cycles, Fe-W 18 O 49 /NH 2 -MIL-125 remain maintains good stability during the catalytic process. This paper provides a possibility for constructing low-cost heterojunction catalysts in the territory of photocatalytic nitrogen fixation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Peng Wei,Yang Sui,Dong Huang,Bensheng Zhu,Xiaoyu Meng,Qiong Zhou
Sulfonated poly ether ether ketone (SPEEK) was used to fabricate proton exchange membrane (PEM) due to its adaptable proton conductivity. However, PEM cannot simultaneously enhance its conductivity and stability. To solve the problem mentioned above, phosphotungstic acid (HPW) with strong inherent proton conductivity was chosen to add to the SPEEK matrix, but it still faces the leaky problem. NH 2 -UiO-66 (NU6) with a large surface area and chemical stability was synthesized in situ on the surface of polyimide (PI) nanofiber to create NU6@PI nanofiber, which can be used to anchor HPW. Meanwhile, the stability of proton transport channel may be further enhanced by the sandwich structure, which may be advantageous for proton transport. The NU6@PI/SPEEK + HPW-20 exhibited a conductivity of 174.9 mS·cm −1 and a swelling ratio of 19 % at 60 °C and 100 % RH. After 6 weeks of testing, its conductivity decreased to 151.2 mS·cm −1 which was 24 % higher than that of SPEEK, while the swelling ratio increased to 31 % which was lower than that of SPEEK. The outcome demonstrates that the sandwich-structure NU6@PI/SPEEK + HPW membrane may really boost proton conductivity and stability at the same time. By using XPS and TEM, it is possible to confirm the acid-base interaction and acid-rich layer that exist at the interfaces of NU6@PI nanofiber and HPW/SPEEK matrix. After 6-weeks of usage, the sandwich-structure composite membrane with nanofiber at both the top and bottom of PEM can still maintain high proton conductivity and high stability, offering a novel research idea for resolving the issue that PEM cannot simultaneously achieve significant proton conductivity as well as elevated stability.
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ChemistrySelect
·
2021
·Vol. 6
·期 14
·3370-3377
·
IF 2.109
Kazem Karami,Ali Mardaniboldaji,Mohammad R. Rezayat,Parvaneh Bayat,Mohammad T Jafari
Graphical New UiO-66-NH 2 /Gly/GO nanocomposite solvothermally synthesised and characterized by techniques such as FTIR, XRD, EDAX, TGA, TEM and SEM. Nanocomposite has been exploited as an adsorbent in solid phase microextraction (SPME) method and also the pesticide chlorpyrifos as an organophosphorous pesticide is selected for the model compound. As for a determination system, Corona discharge ionization-ion mobility spectrometry (CD-IMS) has been employed. This paper seeks to produce UiO-66-NH 2 /Gly/GO nanocomposite, which is solvothermally synthesised by the “prefunctionalisation” approach using 2-aminoterephthalic acid as an organic linker in a Teflon lined autoclave and its linking to a graphene surface by glycine and finally characterized by methods such as FTIR spectrometer, Powder X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), thermal stability measurement (TGA), transmission electron microscope (TEM), scanning electron microscope (SEM) and the Brunauer-Emmet-Teller (BET). UiO-66-NH 2 /Gly/GO nanocomposite has been exploited as an adsorbent in solid phase microextraction (SPME) method and also the pesticide chlorpyrifos as an organophosphorous pesticide is selected for the model compound. As for a determination system, Corona discharge ionization-ion mobility spectrometry (CD-IMS) has been employed. The nanocomposite capability in extracting the target analyte before and after the coating of the GO has been experimentally investigated. The IMS sensitivity has been strikingly increased in the course of using the GO as the nanocomposite coating. In order to increase the extraction efficiency and preconcentration of the analyte, both extraction temperature and time are scrutinized. All through this method, analysis factors are achieved as follows: linear dynamic range (LDR); 0.5-20.0 μg L −1 , correlation coefficient (R 2 ); 0.9992, the limit of quantification (LOQ); 0.5 μg L −1 , and limit of detection (LOD); 0.15 μg L −1 . On the whole, the proposed approach seems to be regarded as a successful method for analyzing the organophosphouros pesticide.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Malcom Frimpong Dapaah,Baojian Liu,Liang Cheng
Metal-organic frameworks (MOFs) are of particular interest in the adsorption of organic pollutants . This study investigated the adsorption of aniline (ANI), furfural (FUR), and bisphenol A (BPA) in aqueous solution using MIL-101(Cr)-X (X = –H, –NO 2 , –NH 2 and, –N-2-pyc), MIL-100(Cr, Fe), HKUST-1, and ZIF-8. For the first time, an imino-functionalized MOF was used to adsorb organic compounds in water. MOFs were characterized by XRD, N 2 adsorption-desorption, SEM , TEM, elemental analysis, and FTIR. MIL-101-N-2-pyc demonstrated the highest adsorption capacity of 460.8, 126.5, and 100.7 mg/g towards 500 mg/L BPA, ANI, and FUR respectively. The adsorption isotherms better suited the Langmuir model than the Freundlich model. Importantly, 98% of BPA (100 mg/L) was removed and the kinetic data correlated well with the pseudo-second-order model (R 2 > 0.998). Binary adsorption of FUR and acetic acid (AA) were determined for industrial relevance. MIL-101-N-2-pyc outperformed commercial activated carbon and the other MIL-101s with an impressive co-adsorption of 66.1 mg/g FUR and 62.5 mg/g AA. Overall, the adsorption mechanism was due to hydrogen bonding, π-π interaction, and electrostatic attraction. Moreover, MIL-101-N-2-pyc exhibited remarkable structural stability and less than 0.01 wt% Cr leached into water. The adsorbent regeneration was improved after 4 cycles in methanol.
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