Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Zhiqiang Guo,Hui Hou,Jian Zhou,Xinmiao Wu,Yuan Li,Liangliang Hu
ZIF-8, a metal-organic framework, has large sorption capacities for a series of heavy metals. However, it is difficult to be separated from aqueous solution, limiting its practical application in wastewater treatment . Herein, ZIF-8 was in-situ grown on the polyethyleneimine-functionalized alginate to construct the ZIF-8 @ALG-PEI aerogels with a three-dimensional network structure. This synthesis strategy not only overcomes the above-mentioned defects of ZIF-8, but also provides more functional groups, pores, and channels. The synthesized ZIF-8 @ALG-PEI aerogels exhibit outstanding removal performance towards Pb(II) and Cd(II) with maximum sorption capacity values of 295.986 and 249.838 mg·g −1 , respectively. The sorption of Pb(II) and Cd(II) on ZIF-8 @ALG-PEI is strongly affected by pH, but little influenced by ionic strength. In the multi-component sorption systems, ZIF-8 @ALG-PEI shows better sorption affinity and selectivity for Pb(II) than for Cd(II). The three-dimensional network structure constructed by alginate makes Pb(II) and Cd(II) easier to contact with the surfaces of ZIF-8 @ALG-PEI. The strong surface complexation of the O- and N-containing functional groups provided by ZIF-8 and PEI with Pb(II) and Cd(II) makes the largest contribution to the removal of Pb(II) and Cd(II) by ZIF-8 @ALG-PEI. In summary, the experimental findings of this work prove that the synthesized ZIF-8 @ALG-PEI aerogels have promising applications in practical wastewater treatment .
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ChemElectroChem
·
2023
·Vol. 10
·期 18
·e202300283
·
IF 4
Yang Ming,Yidi Wang,Jiachuan Hua,Chang Liu,Jiashen Li,Bin Fei
Graphical A facile PVP assisted Zn 0.2 @ZIF-67 framework is thermally converted to micro-mesoporous carbon with abundant cobalt particles. Post phosphorus doping into carbon shells improves catalysts’ conductivity and modulates the electronic environment of Co element, facilitating efficient water splitting. The enhancement of electrocatalytic water splitting by modulating the intrinsic electronic environment of active sites has recently attracted lots of interest. Herein, cobalt-cobalt oxide (CoO x ) at carbons derived from metal-organic frameworks (Zn 0.2 @ZIF-67) have been modulated by using post-phosphine (P-CoO x /NCs), acid leaching (Co/NCs), and oxidation (O−CoO x /NCs) treatments. With the assistance of polyvinyl pyrrolidone, the resultant carbons obtain a high surface area (645.7 m 2 g −1 ) as well as a micro-/mesoporous system after carbonization at 920 °C. These advantages not only enhance the catalytic performance of catalysts, but also facilitate the charge transfer between interfaces towards the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). As a result, the constructed water splitting cell fabricated with 900P-CoO x /NCs requires a low overpotential (89 mV and 343 mV vs. reservable hydrogen electrode respectively) to drive HER and OER at 10 mA cm −2 , a low cell voltage (1.69 V), and a high stability with only 4.9 % decay after 15 hours operation in the alkaline medium.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Renjie Ding,Haifeng Zhu,Jiashun Zhou,Huihua Luo,Kehui Xue,Lianqing Yu,Yaping Zhang
Developing highly water-stable zeolitic imidazolate frameworks (ZIFs) for visible-light-driven photocatalytic hydrolysis is important and challenging. Herein, the Type II heterojunction catalyst Mn0.5Cd0.5S@ZIF-8 and its derivatives (including MCS@ZIF-8-Mn, MCS@ZIF-8-Br, and MCS@ZIF-8-MB) were successfully constructed using a facile strategy. Through dual postsynthetic ligand and cation exchange (PSE) treatments of Mn(Ac)2·4H2O and 4-bromo-1H-imidazole for ZIF-8, the hydrogen production efficiency of the MCS@ZIF-8-MB heterojunction catalyst can reach 5.450 mmol·g–1·h–1 and remain at 97.11% after 9 h of the stability test. Construction of heterojunctions can effectively improve the hydrogen production performance of Mn0.5Cd0.5S while maintaining excellent water stability. X-ray photoelectron spectroscopy results show that upon successful construction of the MCS@ZIF-8-MB heterojunction an interface forms between the surface of MCS and ZIF-8-MB, effectively weakening the photocorrosion of MCS. Density functional theory calculations also indicate that the induction of Mn can increase the electronic states of p and d orbitals near the Fermi level of ZIF-8, suggesting that Mn(II) attracts more electrons than Zn(II). This provides more powerful theoretical evidence for the electron cloud shift from the electron donor S2– to Mn2+.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jieqiong Mo,Die Hu,Xin Liu,Ya Sun,Xiaofang Li,Chunlei Wang,Bo Chai,Deng Ding,Juntao Yan,Linbing Sun
Electrospun nanofiber membranes are ubiquitous in the ecological environment due to the high specific surface area and porosity, excellent functionality and recycling. Surface enriched ZIF-67 that incorporated into electrospun rice straw-derived cellulose acetate (RSCA) nanofibers mats were synthesized using a facile in-situ growth strategy. The RSCA was achieved by the acetylation reaction of rice straw-derived cellulose, which was extracted from the recycled waste agricultural rice straw by green solvent. The structures and properties of ZIF-67/RSCA were investigated to reveal the mechanism of in-situ growth method. ZIF-67/RSCA mat shows efficient CO 2 capture and water treatment performance. The achieved ZIF-67/RSCA-0.1 M nanofiber membrane possesses optimal capacities for CO 2 (1.33 mmol/g at 273 K and 101 kPa), which reached to 70% of ZIF-67 powders. MO adsorption capacity of ZIF-67/RSCA-0.1 M membrane was matched with the pseudo-second-order kinetic model, and their equilibrium adsorption capacity towards MO was found to be 11.20 mg/g at room temperature, which is about 15 times as that of pure RSCA nanofibers membrane (0.77 mg/g). Moreover, the ZIF-67/RSCA could selectively adsorb the MO, while it cannot remove the MB pollutant. The detailed analysis of BET and Zeta potential indicated that larger specific surface area and positive potential of ZIF-67/RSCA were favorable for efficient adsorption and selectivity . We believe the approach to fabricate ZIF-67/RSCA nanofibers membrane using the rice straw for removing CO 2 and MO is a win-win strategy for the application of agricultural waste to environmental pollution .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Y. Lei,Z.N. Jiang,X.Q. Zeng,Y.Y. Li,X. Wang,H.F. Liu,G.A. Zhang
In this work, dodecyltrimethoxysilane (DTMS)-modified zeolitic imidazolate frameworks nanoparticles (ZIF-67@DTMS NPs) were prepared and added into epoxy (EP) matrix to fabricate composite coating . The anti-corrosion performance and adhesive force of ZIF-67@DTMS/EP coating were measured with electrochemical impedance spectroscopy and pull-off tests. The results show that compared to pure EP coating, the impedance modulus of ZIF-67@DTMS/EP composite coating is significantly enhanced. The prepared ZIF-67@DTMS NPs as nanofillers can significantly improve the corrosion resistance and the adhesion of EP coating. In addition, the diffusion coefficient of aggressive species in the coatings were determined by molecular dynamics simulations , and the influence mechanism of ZIF-67@DTMS NPs on the anti-corrosion performance of epoxy coating was explored. The ZIF-67@DTMS NPs could combine with EP tightly through forming hydrogen bond . Meanwhile, these NPs could fill in the holes in the EP coating and then block the transmission channel of aggressive species, which enhances the barrier of coatings to the access of aggressive species, then improves the anticorrosion performance of coatings.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Hang Yu,Dajian Cai,Shiyang Li,Congjie Gao,Lixin Xue
Tight ultra-filtration (TUF) membranes with in-situ grown zeolitic imidazole framework (ZIF) particles embedded in and packed under porous polysulfone (PSF) separating layers were prepared using non-solvent induced phase separation (NIPS) processes. Imidazole ligands contained in casting solutions were released and reacted with divalent Zn 2+ cations pre-loaded on non-woven fabric supporting layers. The capillary filling pore size and molecular-weight-cut-off (MWCO) Stokes solute rejection pore size of the formed ZIF/PSF TUF were tuned by varying the loading levels of Zn (II), polyvinylpyrrolidone (PVP) and imidazole, as well as the NIPS reaction time. With thinned PSF separating layer (200–500 nm) and embedding water permeating short-cuts from the ZIF particles, ZIF/PSF TUF membranes showed 7 times higher water permeance (up to 250 L/(m 2 h bar)) and greatly enhanced dye/salt retention selectivity, bearing high potential for applications in dye and textile waste water treatment processes.
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INORGANIC CHEMISTRY
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2022
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IF 5.436
Chengyu Zhang,Zhaodong Nan
Metal–organic frameworks (MOFs) can be used as ideal artificial nanozymes for an open structure to transfer substances and products. The nanozymic mechanism of MOFs needs further investigation for wide application. In this manuscript, no peroxidase-like activity was found for ZIF-67 (a kind of MOF), however, it enhanced the peroxidase-like activity of the Fe0.8Ni0.2S2/ZIF-67 composite, in which Fe0.8Ni0.2S2 was the active composition. The catalytic constant (Kcat) is higher at 1.98 (for TMB) and 2.08 (for H2O2) times and the catalytic efficiency (Kcat/Km) is higher at 3.13 (for TMB) and 2.67 (for H2O2) times, than those of Fe0.8Ni0.2S2. The Km value decreased about 85 times (for H2O2) for Fe0.8Ni0.2S2/ZIF-67 than that of horseradish peroxidase (natural enzyme). The mechanism was proposed. The limit of detection of H2O2 for Fe0.8Ni0.2S2/ZIF-67 is 0.039 μM, which is lower by about 18.2 times than that of Fe0.8Ni0.2S2. Simultaneously, Fe0.8Ni0.2S2/ZIF-67 was used to rapidly detect ascorbic acid for only 1.0 min in food monitoring. This study may be important to design a new kind of nanozyme.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Xiao-Xue Jiang,Pan Li,Meng-Ya Zhao,Rui-Cong Chen,Zhen-Guang Wang,Jia-Xiu Xie,Yun-Kai Lv
Controllable encapsulation of sulfur quantum dots (SQDs) into metal-organic frameworks (ZIF-8) by a surface-bound zinc ion-induced growth strategy, and SQDs@ZIF-8 was successfully prepared for alkaline phosphatase (ALP) detection. The new synthesis procedure involves first binding Zn 2+ to the surface of SQDs to form SQDs/Zn, and then via zinc ion-induced in situ ZIF-8 growth to obtain SQDs@ZIF-8, which greatly improved the luminous efficiency of SQDs. The specific process of detecting ALP using pH-triggered fluorescence quenching of SQDs@ZIF-8: firstly ALP hydrolyzes 2-phosphate- l -ascorbic acid trisodium salt (AAP) to ascorbic acid (AA), and then the leakage of SQDs in the SQDs@ZIF-8 leads to a decrease in fluorescence intensity based on the destruction of ZIF-8 skeleton by H + released by AA. A linear relationship was obtained between the fluorescence intensity and the ALP concentration in the range of 0.15–50 U/L, and the detection limit was 0.044 U/L. Moreover, it was found that free SQDs can be complexed with Fe 2+ to produce wine red complexes, and the obtained UV absorbance and ALP concentration have a linear relationship in the range of 10–200 U/L. The detection range of ALP is significantly broadened based on the combination of the above two detection methods. Furthermore, SQDs@ZIF-8 exhibited excellent stability in water and was successfully applied to the fluorescence and colorimetric detection of ALP in human serum.
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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Song Duan,Xiuzhou Lin,Baojie Dou,Han Yang,Yingjun Zhang,Wilfred Emori,Xiulei Gao,Zhiwen Fang
In this study, ZIF-8 was used to modify fluorinated graphene (FG) to enhance its compatibility with epoxy resins (EP). Triton X-100 (TX-100) was innovatively used to modify the high F-content FG, enabling the surface to be loaded with large amounts of ZIF-8. SEM, XRD , FT-IR, TGA and XPS results confirmed the successful preparation of the FG@ZIF-8 (FZ). Compared to EP coating, the FG-modified epoxy coatings (FG/EP coatings) had improved corrosion resistance , mechanical properties and wear resistance, and especially long-term corrosion resistance by more than two orders of magnitude. However, the low compatibility of FG with the resin limited the efficient improvement of the corrosion resistance and mechanical properties of the FG/EP coatings. In contrast, the FZ/EP coatings achieved significant improvements in corrosion resistance, mechanical properties, and wear resistance, with the coatings displaying excellent corrosion resistance (|Z| 0.01 Hz close to 1.01 × 10 11 Ω·cm 2 ) after 10,000 h immersion. The high F content 3FZ(T)/EP coating modified by TX-100 also exhibited excellent wear resistance with a 98.3 % reduction in wear rate compared to the EP coating. The significant improvements in the performances of the FZ/EP coatings are attributed to the high compatibility of FZ with epoxy resins, the efficient physical barrier, and the ability of FZ to inhibit electron transport , as well as the high crosslink density of the FZ/EP coatings. This study provides a reference for the development of ultra-high corrosion and wear-resistant coatings.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Linzhi Li,Xing Liu,Benchao Su,Huiyin Zhang,Rui Li,Zilong Liu,Qi Chen,Tianzeng Huang,Hongmei Cao
A novel electrochemical immunoassay based on nanobody heptamer for ultrasensitive detection of alpha fetoprotein (AFP) is proposed. First, AFP heptamer fusion protein (A1-C4bp α) is prepared via fusing the AFP-specific nanobody (A1) with the C-terminal fragment of C4-binding protein (C4bp α). Then A1-C4bp α heptamer with higher affinity is used as the molecule recognizing probe to capture numerous the AFP, increasing the sensitivity of the immunosensor. Moreover, AuNPs decorated zeolitic imidazolate framework ( [email protected] ) with large surface area, and abundant binding sites serves an ideal nanocarrier to increase heptamer loading. Multiwalled carbon nanotube (MWCNTs) with excellent electrical conductivity was immobilized on glassy carbon electrode (GCE) to enhance electrochemical signals. The coupling between the [email protected] @MWCNTs and heptamer technologies constructed an ultrasensitive and specific immunosensor for AFP detection in the range of 0.1 to 10 5 pg mL −1 with a lower detection limit of 0.033 pg mL −1 . The as-prepared electrochemical sensing exhibited excellent performance and could be employed to determine AFP with satisfactory results in actual serum samples, suggesting that the proposed strategy for nanobody multimerization provides an alternative scheme for enhancing sensitivity in important biomarkers detection.
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RARE METALS
·
2022
·Vol. 41
·期 8
·2745-2758
·
IF 6.318
Li Pu-Bo,Wang Yong-Xun,Shao Ze-Xi,Wu Bin-Tao,Li Heng,Gao Mang-Mang,Liu Kuan-Guan,Shi Ke-Ren
The Mg–Al layered double hydroxide (LDH) conversion coatings were first synthesized in situ to modify the AZ91D alloy through urea hydrolysis to adjust the pH values (9.4, 10.4, 11.2 and 11.4). The pH 11.2 Mg–Al LDH possessed the best compactness and good crystallinity compared to other in situ LDH coatings and obtained the lowest corrosion current density ( i corr ) of (2.884 × 10 −6 ± 0.345 × 10 −6 ) A·cm −2 , which was attributed to the anion-exchange reaction of LDH and the physical barrier against corrosion owing to the twisted penetration pathway of the interlaced LDH sheets. Core–shell structured Zn–Al LDH@ZIF-8 powder modified with stearic acid (SA) was further wrapped with polyvinylidene fluoride (PVDF) to prepare a hydrophobic double-layered coating on the underlying pH 11.2 Mg–Al LDH (SLLZ). The water contact angle (CA) of the SLLZ coating reached 105.6°, and its i corr decreased to (3.524 × 10 −7 ± 0.214 × 10 −7 ) A·cm −2 compared with a single pH 11.2 film. The SLLZ coating exhibited high durability and corrosion protection, even after 15 days of immersion in NaCl solution. The PVDF, SA and ZIF-8 nano-shells contributed to good hydrophobicity, effectively forming a physical barrier. The Zn–Al LDH core and underlying in situ Mg–Al LDH were beneficial for synergistically promoting anion-exchange reaction between the intercalated anions of LDH and chlorides in corrosive media. This work provides a promising approach that combines core–shell LDH@ZIF-8 with LDH film on a Mg alloy surface to construct a hydrophobic film with excellent long-term anti-corrosion performance. Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Dege Xili,Qian Zhou,Lijuan Zhang
Non-precious metal nitrogen-carbon composites (M-N-C) derived from ZIFs are an excellent non-precious metal catalyst for use in energy conversion and storage devices such as fuel cells and metal-air batteries. Herein ZIF-67 precursor with good dispersion, perfect crystal structure and size of below 270 nm was synthesized by consuming low amount of 2-methylimidazole ligand using a mixture of ethanol (EA) and methanol (MT) as the reaction medium. Compared with the traditional method of reducing the size of ZIF-67 by increasing the amount of ligands in methanol, this method avoids the waste of raw materials and saves the cost. The Co-N-C-MT/EA catalysts derived from ZIF-67 exhibits good ORR activity in alkaline media (0.1 M KOH) with a half-wave potential of 0.81 V vs RHE. After 5000 cycles, the initial potential and half-wave potential basically remain no change, showing excellent long-term stability. And remarkable methanol resistance is also displayed comparing with commercial Pt/C. The present experimental result shows that the improved synthesis method of ZIF-67 precursors has far-reaching implications for the field of catalyst research.
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