SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Mengjie Pu,Daqi Ye,Jinquan Wan,Bentuo Xu,Wei Sun,Wei Li
A novel peroxymonosulfate (PMS) catalyst, zinc-based metal–organic framework electrospinning (ES) nanofibers membrane (short for ZIF-65/PAN) was firstly fabricated and used for the degradation of aqueous ciprofloxacin (CIP). Physicochemical properties, catalytic performance, stability, reusability, and the regeneration of ZIF-65/PAN was observed and conducted. Influence of various parameters including ZIF-65 loading content, reaction temperature, initial pH, and competitive organic molecules on CIP degradation was investigated. Reactive active species and degradation intermediates that involved in ZIF-65/PAN/PMS/CIP process were identified. Corresponding reaction mechanisms were speculated. The results indicate that the easy-separation ZIF-65/PAN nanofibers exhibit high efficiency for PMS activation, 89.2 % of CIP was degraded within 60 min, with up to 87.5 % of PMS utilization efficiency. ZIF-65/PAN was renewable through simple layer-by-layer self-assembly, thus shows good prospect in future applications. 26.4 % of surface Zn 2+ of ZIF-65/PAN exists in the form of + III oxidation state after activation, indicating the role of zinc catalytic site. Through activation, oxidative active species SO 4 ·− , ·OH, and 1 O 2 was generated, CIP was thus degraded through mainly-three pathways. This study provides novel ideas for the application of MOF-based membrane on PMS based advanced oxidation processes.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Lei Deng,Senqing Fan,Yu Chen,Jiaojiao Chen,Zenghui Mai,Zeyi Xiao
A binder-free self-supported CuO/ZIF-8@NiF electrode is fabricated with CuO/ZIF-8 particles in situ growth in nickel foam pores. ZIF-8 is first assembled inside the nickel foam pores and then Cu2+ is adsorbed around the surface of ZIF-8 crystal, and finally reduced and oxidized to form CuO. Scanning electron microscopy indicates CuO is uniformly distributed on the surface of ZIF-8. The Cu element is significantly increased from 1.16 to 30.91 mg·g–1 under the existence of ZIF-8 from inductively coupled plasma results. The electrochemical analyses show that the electrochemical active surface area of the CuO/ZIF-8@NiF electrode can be increased two times while its electronic transport resistance can be reduced to one-seventh compared with the CuO/ZIF-8/NiF electrode with CuO/ZIF-8 binding on the substrate. The detection tests exhibit enhanced electrochemical properties with a sensitivity of 5640 μA·mM–1·cm–2, a low detection limitation of 0.1 μM, and a linear detection range from 0.5 to 120 μM. The biosensor presents good anti-interference property, stability, and a 101.08–104.53% recovery rate.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Yuming Xie,Jingqiu Li,Mengjue Cao,Yi Feng,Jianfeng Yao
CoS 2 /Co-Ni layered double hydroxides (LDHs) with a rational tailored pore structure are developed by partial sulfurization of Co-ZIF-L and subsequent Ni 2+ etching for the transformation of zeolitic imidazolate frameworks (ZIFs) to layered double hydroxides . The as-synthesized CoS 2 /Co-Ni LDHs maintain the leaf-like structure and have rich hierarchical pores. More importantly, CoS 2 nanoparticles are uniformly embedded among Co-Ni LDH layers, facilitating mass diffusion and favorably exposing more active sites. Benefiting from these desirable compositional and structural features, a remarkable specific capacitance (capacity) of 1784 F/g (223 mAh/g) at 1 A/g is delivered by CoS 2 /Co-Ni LDHs. Furthermore, the as-assembled CoS 2 /Co-Ni LDH//activated carbon as the asymmetric supercapacitor device also exhibits a high energy density of 125 Wh/kg at a power density of 800 W/kg and a superb capacitance retention of 98 % after 5000 cycles, outperforming many Co-Ni LDH based electrode materials reported in the literature.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Chao Xue,Qu Zhang,Wenpeng Li,Gary Ownes,Zuliang Chen
The removal of antimonate (Sb(V)) species from wastewaters has become a growing concern due to their known genotoxicity and carcinogenicity. In this paper, a hybrid ZIF-8@FeNPs material was synthesized from Zeolite Imidazole Framework-8 (ZIF-8) and zero-valent iron nanoparticles ( n ZVI) and subsequently used to remove Sb(V) from aqueous solution. Characterization indicated that ZIF-8@FeNPs were successfully synthesized and that the valence state of Sb(V) did not change during the removal process, where adsorption of Sb(V) was facilitated by the high specific surface area and porosity of the hybrid. Advanced characterization also showed that Zn-OH and iron oxides were adsorbed on the material after complexation with Sb(V). Kinetic, isothermal, and thermodynamic modeling indicated that the adsorption process followed pseudo-second-order kinetics, via multilayer adsorption which was spontaneous and endothermic. A Sb(V) removal mechanism based on adsorption was proposed. In mining wastewater containing 1.121 mg·L −1 Sb(V), 89.7 % could be removed by the material. During repeated reuse of ZIF-8@FeNPs for the removal of 1 mg·L −1 Sb(V) through four successive cycles, the removal efficiency was still relatively high (39.1 %) after the fourth cycle indicating good potential for practical applications. In addition, ZIF-8@FeNPs also exhibited magnetic properties, which demonstrated that Sb(V) could be easily recovered from wastewater post removal by ZIF-8@FeNPs.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Zhengchi Yin,Xiaoke Wu,Yanwei Yang,Huayu Zhang,Wangtao Li,Ruimin Zhu,Qiancheng Zheng,Zhengbao Wang
Compared to inorganic supports, polymeric supports can offer additional benefits, e.g. , easier processing and cheaper. However, the organic surface has weak adhesion to the zeolitic imidazolate frameworks (ZIFs) membrane layer, which usually requires complex surface modification or seeding. Herein, we demonstrate that a dual-layer asymmetric polymer support prepared by a simple spinning process is a good candidate for the preparation of ZIF-8 membrane. The inner layer of the support is an organic hollow fiber (PES) with finger-like pores, and the outer layer is a ZnO-PES composite layer with finger-like pores also. The ZnO-PES composite layer is expected to contain uniform ZnO crystals in the polymer matrix, i.e ., the ZnO particles in the skin layer of the support are not easy to fall off. Under the induction of ZnO particles in the outer layers, continuous ZIF-8 membranes can be prepared by single in-situ crystallization, showing good adhesion to the supports. The obtained ZIF-8 membranes show a H 2 permeance of 8.7 × 10 −8 mol·m −2 ·s −1 ·Pa −1 with a H 2 /N 2 ideal separation selectivity of 18.0. The design and preparation of this dual-layer polymer support is expected to promote the large-scale application of MOF membranes on polymer supports.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Sheng Liu,Yiyang Zeng,Jun Liu,Jiamao Li,Hao Peng,Hui Xie,Hao Zou,Chengjian Xiao,Xiaohui Hua,Jingliang Bao,Liang Xian,Yuanli Li,Fangting Chi
The capturing and storage of iodine from nuclear waste through secure and advantageous techniques are significant. In this work, a novel bismuth-based porous carbon material referred to as Bi@MVF is elaborately synthesized employing a dipping-reduction technique to seize iodine-129 ( 129 I), in which bismuth particles are uniformly embedded and allotted on the porous carbon network as multiple active sites. Accordingly, Bi@MVF lets in a highly-efficient iodine absorption potential of up to 1560 mg/g after publicity to iodine at 120 ℃ for 4 h, superior to most standard iodine adsorbents. The excessive adsorption kinetics of these Bi@MVF adsorbents is typically attributed to the specific porous carbon substrates' full-size particular surface area and the adsorbent’s synergistic effect. An in-depth perception of the iodine adsorption mechanism exhibits that the chemical adsorption turns into a powerful mechanism via the reaction between bismuth and iodine to structure a steady section BiI 3 . Moreover, an easy post-treatment system for these Bi@MVF adsorbents is adopted to gain the greater corrosion-resistant iodine-binding segment Bi 5 O 7 I, attaining a nominal iodine leaching rate. Therefore, the designed Bi@MVF will be a tremendous 129 I stabilizer, and we will contribute a new approach for customizing new iodine adsorbents with excessive adsorption doses.
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Particuology
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2022
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IF 3.251
Yukui Gou,Yuanye Hao,Weilong Cai,Jianying Huang,Yuekun Lai
Particulate matter (PM) is a significant danger to both environment and human health. Despite the development of a series of air filters, they do not work well in harsh environment such as high temperature, high humidity or long-time filtration. To make a three-dimensional (3D) particle capture device, a sacrificial template approach was used to manufacture polydimethylsiloxane (PDMS) sponge, and then zeolite imidazole framework-8 (ZIF-8) was grown in situ on the 3D network of PDMS sponge. The removal efficiency of PM 2.5 or PM 10 is greater than 99.8% because of the high specific surface area and porous network structure of PDMS sponge, as well as the large number of metal sites of ZIF-8. In addition, the sponge filter has long-term filtration stability and still achieves excellent performance after 65 h of filtration. The composite sponge can adapt to harsh environments such as high temperature (250 °C) and high humidity (90% RH). Composite sponge filter has a regular shape, and it may be customized to any shape as required. This study provides a new idea for designing 3D high-efficiency air filters that can adapt to harsh environments.
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PROGRESS IN ORGANIC COATINGS
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2021
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IF 5.161
Chunlin Chen,Guoqing Xiao,Fei Zhong,Shaotang Dong,Zhengwei Yang,Chunyan Chen,Mingtan Wang,Rui Zou
Herein, the ZIF nanoparticles were firstly anchored uniformly on the reduced graphene oxide (RGO) surface, and then a layer of silica was deposited on the surface to avoid the negative impact of the pores generated by the decomposition of the ZIF nanoparticles on the thermal insulation properties. The effect of reduced graphene oxide/zeolitic imidazolate framework-8@silicon oxide (RGO/ZIF@SiO 2 ) hybrids on the fire performance of the coatings was analyzed by big plate experiments, furnace test, and thermal weight loss test. The results showed that the backside temperature of RGO/ZIF@SiO 2 based intumescent fire-retardant coating (IFR) reached the minimum value (173.9 °C) compared to other samples. The expansion characteristics of the coatings were significantly increased by the addition of nanoadditives . By comparison, RGO/ZIF@SiO 2 /IFR composite coating exhibited the largest expansion height (21.5 mm) and expansion rate (16.28). Moreover, the IFR loaded RGO/ZIF@SiO 2 displayed the highest maximum thermal decomposition temperature (T max , 371.1 °C) and residual char (29.8%), indicating its best fire resistance properties. The cone calorimeter test results illustrated that RGO/ZIF@SiO 2 /IFR had the lowest PHRR (482 ± 21 kW/m 2 ), THR (15.57 ± 0.9 MJ/m 2 ), PSPR (0.10 ± 0.01 m 2 /m 2 ), TSP (2.01 ± 0.11 m 2 /m 2 ) and CRR (28.8%) values, indicating its best flame retardant and smoke suppression properties.
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POLYMER DEGRADATION AND STABILITY
·
2021
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IF 5.03
Dongyue Liu,Yihua Cui,Tianlong Zhang,Wenhua Zhao,Pengfei Ji
The introduction of traditional flame retardants into epoxy resins (EP) usually generated a number of harmful smoke during burning. A novel flame retardant ( d ZIF-8) was synthesized via functionalization of zeolitic imidazolate frameworks-8 by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivatives (DMZ). The flame retardancy and smoke suppression of the d ZIF-8 modified EP were studied. The combustion results showed that d ZIF-8 can effectively reduce the fire risk of EP. Compared with the neat EP, the value of peak heat release rate (PHRR), the total smoke release rate (TSRR) and the maximum smoke density of the EP containing 2% d ZIF-8 were decreased by 51%, 47% and 36%, respectively. The TG-FTIR results showed that the production of the pyrolysis gaseous products was inhibited by d ZIF-8 during the decomposition of EP. In addition, the synergistic effect between the DMZ and the zeolitic imidazolate frameworks-8 improved the flame retardancy of the EP. Meanwhile, the increase in the flame-retardant performance of the d ZIF-8 modified EP was caused by the quenching effect of the free radical containing phosphorus in gas phase and the charring effect of pyrophosphoric acid and zinc oxide in condensed phase. The morphology of d ZIF-8 crystal changed from granular to laminar, indicating that the introduction of DMZ affected the crystal growth of d ZIF-8. The laminar structure of the d ZIF-8 provided a layered barrier effect during the burning process of EP.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Xuefang Chen,Xiuyun An,Lizhen Tang,Tianwei Chen,Guanhua Zhang
Exploring high efficient electrocatalyst for hydrogen evolution reaction plays a vital role in the sustainable and widespread application of hydrogen fuel. Platinum-based electrocatalysts, as one of the most standout candidates, are limited to large-scale commercial applications attributing to their scarcity, expensive price, poor stability, and inferior durability. Herein, we construct a ZIF-8-derived nitrogen-doped carbon arrays-confined platinum clusters structure, named CTA@Pt@NCBs, on a continuously conducting carbon nanotube arrays substrate. As expected, the prepared CTAs@Pt@NCBs exhibits a low overpotential of 27.42 mV at 10 mA cm −2 . More importantly, CTA@Pt@NCBs demonstrate excellent stability and durability, with 97.18% potential retention after 60 h of chronopotentiometric test, higher than that of commercial Pt/C (53.09%), and virtually no decrease in activity after 10, 000 potential cycles. The excellent electrocatalytic performance is mainly attributed to the unique structural features, including confined Pt clusters, porous nitrogen-doped carbon bubbles, continuous conductive carbon nanotube arrays, and binder-free electrode. This work provides a feasible strategy for improving the stability and atom utilization efficiency of platinum-based catalysts, thereby increasing their cost-effectiveness.
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Journal of Magnesium and Alloys
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2021
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IF 10.088
Shiquan Jiang,Zhiyuan Zhang,Dong Wang,Yuqing Wen,Ning Peng,Wei Shang
Mg alloys are considered the most promising engineering materials because of their unique properties. However, the uncontrolled corrosion rate of these alloys limits their applications. Therefore, in this study, a micro-arc oxidation layer was used as a transition layer to “directly” grow a zinc-based metal-organic framework (MOF) composite coating on the surface of a Mg alloy (AZ91D). Herein, the two zeolitic imidazolate framework (ZIF-8) coatings with different morphologies were separately prepared by homologous metal oxide induction and a one-step in-situ growth method. The superhydrophobic composite coating showed strong hydrophobicity and self-cleaning properties, which could prevent the penetration of water and corrosive ions (Cl − ) into the surface of AZ91D. Electrochemical tests demonstrated that the super-hydrophobic composite coatings greatly enhanced the corrosion resistance of AZ91D, and the corrosion current density decreased from 10 −5 to 10 −9 A/cm 2 . These results indicate that the ZIF-8 coatings are beneficial for improving the hydrophobicity and enhancing the corrosion resistance of Mg alloys. Therefore, MOF composite coatings provide a new strategy that can be used to prepare multifunctional anticorrosion coatings on metal substrates.
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RSC Advances
·
2021
·Vol. 11
·期 60
·37932-37941
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IF 3.361
Ge Guo,Wenzhi Li,Tauseef Ahmed,DuoDuo Hu,Ru Cui,Baikai Zhang,Xia Zhang
Non-noble bimetallic NiMo supported on zeolitic imidazolate framework-derived porous carbon (NiMo@FDC) catalyst for lignin depolymerization has been successfully developed. The synergism between Ni and Mo species in NiMo@FDC catalyst could promote the catalytic cleavage of C–O linkages in Kraft lignin. At a low reaction temperature of 240 °C and under 4 MPa H2, the lignin liquefaction yield was 98.85 wt% and minimum coke yield was 1 wt%, particularly when using 10%NiMo@FDC catalyst. Additionally, at a high reaction temperature of 300 °C and under 2 MPa H2, there was an overall yield of 86 wt% of liquid product and 42 wt% of petroleum ether soluble product. The higher heating value (HHV) increased from 27.65 MJ kg−1 to 34.11 MJ kg−1. In the cycling experiment, the bifunctional catalyst also demonstrated reversability and stability. The synergy of Ni hydrogenation sites and Mo coupled adsorption sites identified a possible mechanism path, which could offer considerable potential for lignin depolymerization.
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