Journal of Environmental Chemical Engineering
·
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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Boyi Yan,Zhongqiao Sun,Yide Han,Hao Meng,Xia Zhang
The construction of a tightly contacted heterojunction consisting of multi-components is proven to be one of the effective strategies to promote the photogenerated charges separation and to develop high-efficient photocatalysts in hydrogen evolution . Herein, a ternary hollow heterostructure of ZnS/ZIS/In 2 S 3 has been fabricated by using a binary MOF@MOF (ZIF-8@MIL-68(In)) as the precursor, and an in-situ sulfurization of ZIF-8@MIL-68(In) is controlled to optimize the photocatalytic performances. The resulting samples are signed as Z@M- t , where the t is pointed to the sulfurization time being varied from 4 h to 48 h. It’s shown that the hierarchical and hollow architecture is formed for Z@M- t , and with the reinforced light harvest ability in both UV and visible light regions. In the subsequent visible-light-induced photocatalytic hydrogen generation, the optimized Z@M-24 manifests significantly improved hydrogen evolution rate of 607.34 μmol g -1 h −1 , which values are evidently higher than that by the single MOF and binary ZIF-8@MIL-68(In) heterostructure. The electrochemical analyses and the electron paramagnetic resonance (EPR) spectrum were analyzed to clarify the charge transfer routes and the enhanced photocatalytic mechanism, in which the contribution of each metal sulfide is also discussed. Finally, the good photocatalytic stability and reusability of Z@M-24 heterostructure are also represented, which define the structure superior brought by the effective heterojunction based on the in-situ sulfurization strategy of binary ZIF-8@MIL-68(In), and determine their prospect applications in the efficient H 2 production under visible light irradiation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuai Ran,Ji Qi,Xufeng Dong,Hao Huang,Min Qi,Wenjing Dong,Penghui Zhao,Zenghui Zhao,Jingyuan Yang
Controllable preparation of cross-linked mesoporous carbon materials on a large scale remains challenging. In the present work, a simple NaCl-assisted pyrolysis strategy is proposed here to efficiently convert closed pores into open pores in the pyrolysis products of 2-methylimidazole zinc salt nanoparticles/polyacrylonitrile (ZIF-8/PAN) electrospun fibers to prepare 1D cross-linked mesoporous N-rich carbon-based oxygen reduction reaction (ORR) electrocatalyst. The total specific surface area of micropores and mesopores was significantly increased from 162 m 2 /g to 1069 m 2 /g (mesopores: 704 m 2 /g). The ORR catalytic activity of open pore was superior to that of closed pore with more positive onset potential (0.96 vs . 0.85 V) and half-wave potential (0.79 vs . 0.72 V), larger limiting current density (5.23 vs . 3.62 mA cm −2 ) and electron transfer number (3.89 vs . 3.15). Such enhanced performance was attributed to the transformation from closed to open pores which greatly improved the mass transfer performance and the number of active sites.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yong Yang,Xinxin Ma,Zifen Li,Yanru Wang,Chao Ju,Lidong Cao,Yongquan Zheng,Qingming Zhang
Neonicotinoids, ones of the most used pesticides extensively present in water environment, are hazardous to environment and human. Herein, a novel magnetic adsorbent ZIF-8-HA@MCSB is designed by modifying ZIF-8 and humic acid (HA) onto the surface of magnetic corn stalk biochar (MCSB) for removing imidacloprid (IMI) and thiamethoxam (THI) from water. MCSB has a superior adsorption performance among magnetic biochars (MBCs); the modification of ZIF-8 creating hierarchically porous structure and HA promoting the crystal growth of ZIF-8 can enhance its adsorption performance. Hence, ZIF-8-HA@MCSB exhibits the high maximum adsorption capacities for IMI (163.9 mg g −1 ) and THI (123.5 mg g −1 ). Meanwhile, the HA modification offers a protective shell for magnetic Fe 3 O 4 , which endows ZIF-8-HA@MCSB with distinguished magnetic stability. Even in pH = 2 solution, ZIF-8-HA@MCSB still possesses a saturation magnetization value of 13.07 emu g −1 , which is beneficial for its separation and reuse. Especially, ZIF-8-HA@MCSB can be repeatedly used 5 times with high removal efficiencies (over 90%). Furthermore, the low Fe (less than 0.3 mg L −1 at pH ≥ 2) and Zn (less than 1.0 mg L −1 at pH ≥ 3) leaching concentrations in a wide pH range guarantee the environmental security of ZIF-8-HA@MCSB. And a promoting effect on wheat growth enables waste ZIF-8-HA@MCSB potentially to be fertilizer for crop production, which agrees with the sustainable concept. Therefore, the advantages of having high adsorption capacities for IMI and THI, resistant to acid, and friendliness to environment indicate that ZIF-8-HA@MCSB has a significant potential for real neonicotinoids removal. Novelty Statement In this work, a novel magnetic adsorbent (ZIF-8-HA@MCSB) with the high adsorption capacities of IMI and THI is obtained by simply modifying ZIF-8 and humic acid (HA) onto the magnetic corn stalk biochar (MCSB) surface. Such a magnetic adsorbent has never been reported before. More importantly, compared with various modification methods to increase the adsorption capacity, there are few reports on concerning the acid resistance and environmental friendliness of magnetic adsorbents, especially the corresponding adsorption capacity also increases.
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TALANTA
·
2023
·
IF 6.1
Ting Huang,Ling Yang,Shuqiang Wang,Chenchen Lin,Xiaoping Wu
Enrichment of perfluoroalkyl phosphonic acids (PFPAs) is of great significance and challenging for environmental monitoring, due to their toxic and persistent nature, highly fluorinated character as well as low concentration. Herein, novel metal-organic frameworks (MOFs) hybrid monolithic composites were prepared via metal oxide-mediated in situ growth strategy and utilized for capillary microextraction (CME) of PFPAs. A porous pristine monolith was initially obtained by copolymerization of the zinc oxide nanoparticles (ZnO-NPs)-dispersed methacrylic acid (MAA) with ethylenedimethacrylate (EDMA) and dodecafluoroheptyl acrylate (DFA). Afterwards, nanoscale-facilitated transformation of ZnO nanocrystals into the zeolitic imidazolate framework-8 (ZIF-8) nanocrystals was successfully realized via the dissolution-precipitation of the embedded ZnO-NPs in the precursor monolith in the presence of 2-methylimidazole. Experimental and spectroscopic results (SEM, N 2 adsorption-desorption, FT-IR, XPS) revealed that the coating of ZIF-8 nanocrystals significantly increased the surface area of the obtained ZIF-8 hybrid monolith and endowed the material abundant surface-localized unsaturated zinc sites. The proposed adsorbent showed highly enhanced extraction performance for PFPAs in CME, which was mainly ascribed to the strong fluorine affinity, Lewis acid/base complexing, anion-exchange, and weakly π-CF interaction. The coupling of CME with LC-MS enables effective and sensitive analysis of ultra-trace PFPAs in environment water and human serum. The coupling method demonstrated low detection limits (2.16–4.12 ng L −1 ) with satisfactory recoveries (82.0–108.0%) and precision (RSDs ≤6.2%). This work offered a versatile route to design and fabricate selective materials for emerging contaminant enrichment in complicated matrices.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yuling Chen,Wei Huang,Kuijun Chen,Ting Zhang,Yang Wang,Jianmin Wang
Herein, a novel core-shell structure composite with traditional conducting polymer, polypyrrole (PPy) as its core and zeolitic imidazolate framework-8 (ZIF-8) shell structure was successfully prepared. Thanks to the advantages over electrocatalytic surface provided by ZIF-8 shell and a charge collector given by PPy, the obtained core/shell-structured PPy@ZIF-8 composite displayed an excellent electrocatalytic performance towards quercetin (QR) determination. Under the optimized experimental condition, the differential pulse voltammetry (DPV) peak current signals depend linearly on QR concentration in the range of 0.01–7.0 μmol ⋅ L −1 and 7.0–150 μmol ⋅ L −1 with a low detection limit of 7 nmol ⋅ L −1 . Furthermore, the proposed electrochemical sensor also exhibited good sensitivity, excellent selectivity with reasonable reproducibility and stability during the detection of quantitative QR. A satisfactory performance was observed when this novel sensor was applied to detect QR in human plasma samples with recoveries of 99.1–102.6% and R.S.D. (n = 3) < 3.2%. Thus, the current study provides a new and efficient electrocatalyst for designing QR electrochemical sensor based on conductive conjugated polymer/MOFs heterostructure.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Dashui Yuan,Jing Ding,Jie Zhou,Lei Wang,Hui Wan,Wei-Lin Dai,Guofeng Guan
A highly efficient ZIF-8/g-C 3 N 4 photocatalyst was prepared by a facile ultrasonic in-situ method. The structure-property relationship of ZIF-8/g-C 3 N 4 composite was analysed by various characterization techniques. The comprehensive study illustrated that ZIF-8 served as an adsorbent to capture the substrates in the contaminated solution and increased the contact possibilities of the active species and substrates. The formation of ZIF-8/g-C 3 N 4 hybrids helped to significantly enhance visible light absorption and facilitate charge transfer and separation of the photogenerated electron-hole pairs, eventually improving the photocatalytic efficiency. Meanwhile, compared with ZIF-8/g-C 3 N 4 composites obtained by incipient wetness impregnation method, ultrasonic in-situ synthesis contributed to hindering the aggregation of g-C 3 N 4 nanosheets and simultaneously promoting ZIF-8 well dispersed on the surface of g-C 3 N 4 nanosheets. The synergistic effect of preparation method and special hybrid structure was studied in-depth and could significantly enhanced photocatalytic activity and stability for the degradation of organic pollutants (such as tetracycline, rhodamine B and methyl orange) under visible light irradiation. The reaction rate constant K values of optimal ratio sample for degradation of TC, RhB and MO were 0.039 min −1 , 0.034 min −1 and 0.012 min −1 , respectively 1.69, 3.96 and 4.10 times as big as that of pure g-C 3 N 4 . Meanwhile, the photoresponse current of optimal ratio sample was 3.3 μA/cm 2 , around 4.73 times as big as that of the pure g-C 3 N 4 . A reasonable photocatalytic mechanism was proposed by the photoelectrochemical experiments and the controlled experiments using radical scavengers.
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Food Chemistry-X
·
2024
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IF 6.5
Xingyu Zhu,Chong Chen,Dou Che,Hui Yan
To improve the activity of single-atom nanozymes (SAzymes) for applications in food analysis, a new bimetal SAzyme FeCe/NC was developed. Its oxidase-like activity is 40% higher than that of single metal SAzyme Fe/NC. Based on a series of characterization investigations, the catalytic mechanism is that it directly catalyzed O 2 to generate • OH, O 2 • - and 1 O 2 . It could directly catalyze oxidation 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB, thereunder, a FeCe/NC SAzyme-TMB colorimetric method for the detection of tannic acid (TA) was constructed after the optimization of catalytic conditions. The method has a high R 2 of 0.995, a low limit of detection (LOD) of 0.26 μmol/L, and high stability. The detection performance was validated by the real samples (tea). Therefore, the prepared bimetallic SAzyme FeCe/NC can be applied for TA detection without the addition of H 2 O 2 , and will have broad applications in the areas of food, feed, and life science.
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TALANTA
·
2024
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IF 5.6
Yaqin Zhan,Jinru Cao,Ying Wang,Xuesong Li,Yixing Li,Huihui Zeng,Wenyi Huang,Hao Cheng,Si Gao,Lijun Li,Jun Feng
Surface Enhanced Raman Scattering (SERS) has been extensively utilized in therapeutic drug monitoring (TDM) due to its rapid detection speed, high sensitivity and straightforward sample pretreatment. In this study, Au/AgNPs were obtained through the reduction of AgNO 3 on the surface of AuNPs. Subsequently, Au/AgNPs were embedded into the tetrahedral lattice of ZIF-8 MOFs, resulting in the formation of Au/Ag@ZIF-8 nanocomposites. The Au/Ag@ZIF-8 nanocomposites exhibit a robust electromagnetic enhancement of Au/Ag bimetallic nanoparticles and a considerable adsorption capacity of ZIF-8 MOFs. This enables the pre-enrichment of target molecules in the vicinity of the electromagnetic field of the Au/AgNPs, thereby enhancing the sensitivity of SERS detection. The SERS substrate also exhibits high stability and reproducibility, as well as molecular sieving effects, due to the fact that Au/AgNPs are embedded into the tetrahedral lattice of ZIF-8. A TDM method for tacrolimus (FK506) in human serum was developed by using Au/Ag@ZIF-8 nanocomposites as solid phase extraction (SPE) adsorbent and SERS substrates. The results showed that under the optimized conditions, tacrolimus exhibited satisfactory linearity within the concentration range of 10 −5 -10 −11 mol L −1 , with a correlation coefficient (R 2 ) of 0.9944, and the limit of detection (LOD) was as low as 6.4 pg mL −1 . The recoveries were observed to range between 92 % and 105 %, with an RSD of below 8 %. The method is highly sensitive, exhibiting a sensitivity that is 3-6 orders of magnitude higher than that of existing analytical techniques. It has the potential to be applied in a clinical setting to biological samples.
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RSC Advances
·
2017
·Vol. 7
·期 27
·16423-16427
·
IF 3.108
Guangming Li,Nan Lv,Jilin Zhang,Jiazuan Ni
A sensitive fluorescent nanosensor based on MnO2 quenching fluorescent carbon quantum dots was facilely developed by MnO2 in situ formed in the pores of C-dots/ZIF-8 hybrid nanocomposite. The C-dots/ZIF-8 hybrid nanocomposite was synthesized via a rapid method within 5 min at room temperature. Then, the MnO2 was directly incorporated into the ZIF-8 framework via redox reaction between the C-dots/ZIF-8 hybrid nanocomposite and KMnO4. The resulting fluorescent nanosensor exhibited a relatively uniform particle size of about 100 nm, good water-dispersibility and a highly selective fluorescence response toward ascorbic acid with a detection limit as low as 83 nM and a linear range of 0.5–8 μM.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Longfei Qiao,Yu Shu,Yan Gao,Hua Fan,Jiaqing Zhao,Jingjing Zhang,Hiroshi Uyama,Yehua Shen
The physical properties and chemical compositions of porous carbons are crucial factors in determining their effectiveness in adsorbing CO 2 . Cellulose-based porous carbon has emerged as an outstanding candidate adsorbent for CO 2 capture. The research involved the creation of hierarchically nitrogen-doped porous carbon (HNC) using a 3D cellulose alcogel (CA) as substrate, which was prepared through a thermal introduced phase separation (TIPS) method combined with hydrolysis treatment. The plentiful functional groups of CA offered abundant growth sites for the introduction of ZIF-8 crystals. CA/ZIF-8 composite alcogel (CZA) with greater surface area and superior thermal stability compared to CA was successfully fabricated and used as precursor for the production of HNC. The important effects of microporosity and surface chemistry of HNC samples on CO 2 capture were discussed in-depth. HNC-350–850 displayed a hierarchically porous structure with a large number of micropores and abundant N/O/Zn-doped functional groups, exhibiting high CO 2 uptakes at 1 bar (3.56 mmol/g at 25 °C), good IAST CO 2 /N 2 (15/85, V/V) selectivity of 16.31 at 25 °C, and outstanding regenerability with ∼100 % CO 2 adsorption capacity retained after ten cycles. In the two-component CO 2 /N 2 (15/85, V/V) competitive adsorption process, the maximum breakthrough periods for CO 2 (433.1 s) is significantly longer than that of N 2 (3.8 s). The CO 2 breakthrough adsorption capacity reached 1.79 mmol/g at 25 °C and 1 bar with the separation coefficient of 45.8 for CO 2 over N 2 . These results confirmed that HNC, in addition to having excellent CO 2 /N 2 selectivity, demonstrated good feasibility for practical use. The green and practicable synthetic route described in this study is not only expected to offer novel adsorbents for high performance CO 2 capture, but also provide a new theoretical foundation for the development of cellulose-based porous materials.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
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IF 4.1
Haopeng Gao,Kangming Wang,Xiangyu He,De Li,Cheng Zheng,Yong Chen
Dual-ion batteries (DIB) have drawn much attention because of their advantages such as low cost, high energy density, and high power density. Graphite has been considered as one of the most promising cathode materials for DIBs due to its low cost, good electron conductivity, environment friendliness and unique two-dimensional layered structure. However, graphite still suffers from limited cycling stability caused by the structural collapse of graphite, resulting from the repeated intercalation/deintercalation of anions, solvent co-intercalation, and electrolyte decomposition on the electrode/electrolyte interface. In this work, the electrochemical performances of graphite cathode are significantly enhanced through a simple way by in-situ coating of the hydrolysate Zn 5 (HMIM) 4 (MIM) 6 (OH) 4 (labeled as ZnHM) derived from ZIF-8, which was performed in aqueous solution at room temperature. It is found that a capacity retention as high as 84 % with the discharge capacity of 65 mA h g −1 after 1000 cycles at 100 mA g −1 was achieved. More importantly, ca. 70 % of the initial discharge capacity is retained even after 3000 cycles at 500 mA g −1 . These remarkable electrochemical properties are attributed to the coating layers of ZnHM on graphite surface, which inhibit the co-intercalation of solvent molecules, keep the structural stability of graphite, and hinder the decomposition of electrolyte.
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