ACS Applied Materials & Interfaces
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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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ANALYTICA CHIMICA ACTA
·
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
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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
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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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PROGRESS IN ORGANIC COATINGS
·
2021
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IF 5.161
Song Xiao,Xiangkang Cao,Zehua Dong,Xiaoze Ma,Xinxin Zhang,Guangyi Cai
Ce-based imidazole complex (Ce-IM/ZIF-8) nanoparticles (NPs) were fabricated by doping cerium ions (Ce 3+ /Ce 4+ ) in zeolite imidazolate framework-8 (ZIF-8) through a one-pot co-precipitation method. The stimuli-responsive release of Ce 3+ /Ce 4+ species from the Ce-IM/ZIF-8 NPs under acidic conditions was confirmed by UV–Vis spectroscopy. Electrochemical impedance spectroscopy and scanning electron microscope were applied to evaluate the corrosion inhibition efficiency of Ce-IM/ZIF-8 NPs on bare aluminum alloy , and it demonstrates that the released Ce 3+ /Ce 4+ , Zn 2+ ions and imidazole could absorb on the surface of Al alloy by chelating effect, forming a compact corrosion barrier on the Al substrate. Furthermore, the Ce-IM/ZIF-8 NPs were encapsulated into epoxy (EP) resin to obtain a composite coating , and it is found that when the NPs addition amount was 1 wt%, the EP-based composite coating exhibits excellent corrosion barrier and promising self-healing ability, with its impedance at 0.01 Hz maintaining 2.2 × 10 8 Ω·cm 2 even after 6 cycles of aging tests (720 h), which could be ascribed to the synergistic inhibition of released Ce ions and imidazole molecules on Al substrate beneath the defective coating.
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SYNTHETIC METALS
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2021
·
IF 3.266
Yaoyao Hao,Yinyue Zhou,Nuohan Xu,Kaixun Tian,Pei Liang,He Jiang
Iron oxide @ poly(m-phenylenediamine) (Z) particles (Fe 3 O 4 @PmPD(Z)) were synthesized by in-situ polymerization of PmPD on the Fe 3 O 4 nanoparticles via ZIF-8 intermediate platform to remove Cr(VI) from wastewater. Analyses of FT-IR, TEM, etc. were performed to evaluate the morphology and structure of synthesized material, and the results confirmed the successful synthesis of Fe 3 O 4 @PmPD(Z). In addition, the TEM and BET analyses results show that the PmPD shell is a flocculating structure, and the increased specific surface area increases the contact with Cr(VI). The Fe 3 O 4 @PmPD(Z) exhibits much better Cr(VI) adsorption performance than Fe 3 O 4 @PmPD, and its adsorption capacity is increased by about 30%, the maximum Cr(VI) adsorption capacity can reach 371.75 mg g −1 at 318 K. According to FT-IR, XPS , and EDS , the removal mechanisms can be attributed to the redox reaction of Cr(Ⅵ) and NH to form N and Cr(Ⅲ), and N shares electron pair with Cr(Ⅲ) to form chelation. At the same time, the appearance of N + also contributes to the removal of Cr(Ⅵ) by generating electrostatic attraction with the negatively charged HCrO 4 - . Besides, the Fe 3 O 4 @PmPD(Z) also exhibits excellent properties of recovery and reuse. Therefore, the current work proves that Fe 3 O 4 @PmPD(Z) has the potential to remove heavy metals in wastewater.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Shaoshao Jiao,Chen Li,Yaowen Zhang,Jianyang Gao,Zhenjiang Li,Kang Liu,Lei Wang
Nitrogen-doped porous carbon materials based on porous organic polymers and metal-organic framework derivatives are prepared for efficient ORR electrocatalysts and supercapacitor. The classic MOFs material ZIF-8 is selected as the core material. After ZIF-8 is pyrolyzed in an inert atmosphere at 900℃, the low-boiling Zn volatilizes, resulting in a hierarchical open-structured carbon-nitrogen material, which is beneficial to the transport of electrolytes in the electrocatalytic process. To further increase the nitrogen content, the designed nitrogen-rich IPOP-coated ZIF-8 composites were immersed in an aqueous solution of sodium dicyandiamide. The catalyst obtained by replacing Cl − and Br − in the porous organic polymer with nitrogen-containing ions and calcined at high temperature is a porous structure material containing a high concentration of active pyridine nitrogen. In addition to exhibiting superior oxygen reduction reaction (ORR) electrocatalytic activity, NC-900 shows superior stability and good methanol tolerance in comparison to commercial Pt/C catalysts in alkaline media as well as acidic media. Furthermore, in 6 M KOH electrolyte, NPCs-based supercapacitor exhibits a high capacitance of 225 F g − 1 with a current density of 1 A g − 1 and possesses good cycling stability (95.75% capacitor retention after 10,000 cycles).
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Xianhong Deng,Wenbin Wu,Shuangqin Tian,Yi He,Shujie Wang,Bifang Zheng,Kai Xin,Ziqin Zhou,Lihong Tang
In this study, we employed a straightforward in-situ synthesis strategy to fabricate multi-site adsorption functional composites known as aminated chitosan@ZIF-8 (AmCs@ZIF-8) for the efficient removal of Cu(II) and Congo red. The AmCs@ZIF-8 adsorbed Cu(II) at pH 5 and Congo red at pH 3 with excellent removal efficiency values of 94 % and 100 % respectively. The maximum adsorption capacity for Cu(II) and Congo red are obtained as 785 mg g −1 and 1156 mg g −1 , respectively. Interestingly, AmCs@ZIF-8 composites exhibited an excellent removal efficiency (>80 %) after reusing them for four sequential cycles. Analysis of the adsorption isotherm and kinetic data indicated that chemisorption primarily governed the adsorption of Cu(II) and Congo red by AmCs@ZIF-8. Furthermore, we elucidated the adsorption energy of Cu(II) and Congo red on the AmCs@ZIF-8 composite through density functional theory. Specifically, the adsorption energy values for Cu(II) with AmCs and ZIF-8 were −20.907 and −57.809 kcal·mol −1 , and −26.514 and −16.242 kcal·mol −1 for Congo red, respectively. The efficient adsorption mechanism of Cu(II) and Congo red on the AmCs@ZIF-8 composite can be attributed to the synergistic effects of chelation, electrostatic attraction, ion exchange, and hydrogen bonding through the analysis of experimental characterization and theoretical calculation. Therefore, AmCs@ZIF-8 composites elevate the adsorption capacity of Cu(II) and Congo red in a single-component system and exhibit high removal efficiency (>90 %) in the context of the Cu(II)-Congo red binary system.
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Arabian Journal of Chemistry
·
2023
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IF 6
Yujie Xu,Xiaoli Zhang,Shuyi Liang,Congmin Niu,Jiayi Guo,Chunbo Lu
There is a serious threat to public health posed by the rapid spread of methicillin-resistant Staphylococcus aureus (MRSA). Photodynamic sterilization is the most effective method of combating bacterial infection, especially multidrug-resistant bacterial infection. In this study, zeolitic imidazolate framework-8 (ZIF-8) nanoparticles, one of the most attractive metal–organic framework material, were used to encapsulate the indocyanine green (ICG, a potent PS); after that, hyaluronic acid (HA) coating was applied to the nanoparticle to create a host cell-tracking nanoplatform (ICG@ZIF-8/HA). Upon near-infrared light irradiation, ICG@ZIF-8/HA exhibit excellent efficacy in producing reactive oxygen species (ROS) and killing multidrug-resistant bacteria in vitro . After the tail vein injection, ICG@ZIF-8/HA can precisely deliver to lung infection sites, and display an effective PDT-based elimination of multidrug-resistant bacteria in mouse lung infection models. These results suggest that the ICG@ZIF-8/HA nanoplatform may exhibit potent curative effects on infectious diseases.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Fan Zhou,Yanqi Ma,Ying Chen,Li Zhang,Xinxin Sheng
Endowing composite coatings with robust anticorrosion properties for metal substrates in intricate corrosive environments, such as conferring self-healing and antibacterial capabilities through the integration of multifunctional nanofillers, constitutes a pivotal approach in the advancement of efficient anticorrosive coatings. In this study, a triple-functional anticorrosion coating entailed the simultaneous integration of graphene oxide (PG) with antibacterial capability, and BTA@ZIF-8/PM (PZ) with self-healing performance, into a waterborne epoxy (PGZ/WEP). The logarithm of the lowest frequency impedance modulus of PGZ/WEP demonstrated a notable value of 8.2 Ω cm 2 following a 28 days immersion in simulated seawater, indicating an escalation of approximately 2.7 orders of magnitude compared to that the reference of WEP. For the antibacterial capabilities of coatings, an enhanced antibacterial rate ( R ) of up to 55.9 % was observed. Moreover, an in-depth analysis was undertaken to explain the underlying anticorrosion, self-healing, and antibacterial mechanisms of composite coatings. In conclusion, the PGZ/WEP composite coating manifests self-healing, antibacterial, and anticorrosive functionalities, thereby demonstrating exceptional adaptability to intricate corrosion-prone environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Min Jia,Fupei Xu,Fei Zhai,Xiaoying Yu,Meixia Du
BPA aptamers functionalized cerium oxide nanoparticles encapsulated in zeolitic imidazolate framework-8 (CeO 2 @ZIF-8/Apt) were developed to fabricate an all-in-one portable platform for on-site quantitative detection of BPA. By combining biocomposites with a 3,3′,5,5′-tetramethylbenzidine (TMB)-based sodium alginate (SA) hydrogel and smartphone-based RGB analysis, highly sensitive and convenient monitoring of BPA was achieved. CeO 2 @ZIF-8 composites were constructed using a novel surfactant-modified concentration-controlled synthesis strategy. After being functionalized with BPA aptamers, CeO 2 @ZIF-8/Apt biocomposites were used as target-response colorimetric probes for target recognition and signal transduction. The oxidase-like activity of CeO 2 @ZIF-8 was effectively sealed by BPA aptamers and controllably released in a concentration-dependent manner through aptamer-BPA reactions. Utilizing SA hydrogels containing TMB in the caps, a one-step sample addition and one-pot detection can be conveniently achieved and reliably quantified by smartphone-based RGB analysis in an instrument-free way. The detection range of this portable detection platform is 50 pg/mL to 500 ng/mL with limit of detection calculated as 34.88 pg/mL, comparable to that of conventional detection in the solution system (4.57 pg/mL). The recoveries in tap water, apple juice, and milk ranged from 91.02 % and 106.75 %. This work contributes new insights into the design of all-in-one detection platforms for contaminants monitoring in resource-constrained regions.
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