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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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Tao Yan,Jianhua Yang,Jinming Lu,Liang Zhou,Yan Zhang,Gaohong He
Due to the poor heterogeneous nucleation properties of MOFs crystal on ceramic substrates resulting from the absence of interaction of MOFs with support substrate surface, it is usually difficult to prepare well-intergrown MOF membranes on substrate by simple in situ growth. In this work, a novel synthesis strategy was used to prepare defect-free ZIF-8 membranes on α-Al 2 O 3 supports by depositing gold particles modified with 2-mercaptoimidazole which creates pseudo-surfaces to bridge the metal centers with support. The end groups of the 2-mercaptoimidazole guides the heterogeneous nuclei to the support surface as homologous-like ligands. Furthermore, investigation of the metal sources revealed that the ZIF-8 membranes prepared with Zn(OAc) 2 as the zinc source possessed more continuous and well-intergrown ZIF-8 membranes with a thickness of about 1 μm compared to other zinc sources. The results of gas separation performance show that the optimized ZIF-8 membranes possess high hydrogen permeance and thermal stability. The gas separation selectivity for binary H 2 /CH 4 mixture reached 20.8 at 150 °C and 1 bar, with a high H 2 permeance of about 6.15 × 10 −7 mol m −2 s −1 Pa −1 , which is promising for hydrogen separation and purification. Moreover, free-organic solvents and room temperature growth by our strategy dramatically reduces the difficulty of preparation and environmental destruction, thus offering a new avenue to prepare MOFs membrane with good separation performance.
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CARBON
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2022
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IF 11.307
Haixing Gao,Shuo Wang,Weng-Chon (Max) Cheong,Kaixi Wang,Huifang Xu,Aijian Huang,Junguo Ma,Jiazhan Li,Weng-Fai (Andy) Ip,Kwan San Hui,Duc Anh Dinh,Xi Fan,Feng Bin,Fuming Chen,Kwun Nam Hui
Defects in nanocarbon materials can trigger their intriguing electrochemical properties and potential applications, but their synthesis is challenging. Herein, we report the synthesis of ultrathin nitrogen-doped carbon nanosheets with intrinsic defects through the pyrolysis of ZIF-8 with linker vacancies. The as-synthesized electrocatalyst exhibits excellent oxygen reduction reaction (ORR) activity with an onset potential and half-wave potential of 1.05 and 0.873 V vs. RHE , respectively, outperforming the reported metal-free ORR electrocatalysts. It also shows a commercial Pt/C-comparable performance in zinc–air battery with a power density of 154.4 mW cm −2 . Characterization and DFT calculation results suggest the adjacent sp 3 -carbon in carbon pentagon can significantly strengthen the adsorption and activation of oxygen molecules on sp 2 -carbon, hence the potential determining step is altered and ORR overpotential is lowered. This work highlights a promising green synthesis strategy of MOF-derived metal-free nanocarbon materials for wide application in advanced energy technologies .
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ChemistrySelect
·
2022
·Vol. 7
·期 38
·e202202721
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IF 2.307
Jiale Lin,Yongfa Cheng,Oi-Ming La,i,Chin-Ping Tan,Worawan Panpipat,Cai Shen,Ling-Zhi Cheong
Graphical Metal ion dopped-Candida rugosa lipase was encapsulated into ZIF structure through biomimetic mineralization, Mg 2+ doping has changed the conformation of CRL resulted in enhanced structural stability of CRL. CRL/Mg 2+ @ZIF-8 was used in biosensing of a protox-inhibiting herbicide in fruit samples with wide detection range, low detection limit and good recovery rate, and Catalytic activity of was two-fold higher than that of CRL@ZIF-8. Present work encapsulated metal ion dopped-Candida rugosa lipase (CRL) into ZIF structure through biomimetic mineralization and evaluated hydrolytic activity of the immobilized lipase using a biphasic system. Magnesium ion (Mg 2+ ) doped-CRL with high hydrolytic activity (237 % of free CRL) was successfully synthesized. Circular dichroism and fluorescence spectroscopy analysis revealed Mg 2+ doping has changed the conformation of CRL resulted in enhanced structural stability of CRL. The synthesized CRL/Mg 2+ @ZIF-8 had a mesoporous (3.88 nm) structure with good crystallinity. Mg 2+ doping increased the catalytic activity, substrates affinity (lower Km of 0.4102 mM) and catalytic stability of immobilized CRL. Catalytic activity of CRL/Mg 2+ @ZIF-8 (0.25±0.012 U) was two-fold higher than that of CRL@ZIF-8 (0.10±0.008 U). The synthesized CRL/Mg 2+ @ZIF-8 was used in biosensing of a protox-inhibiting herbicides (nitrofen) in fruit samples. CRL/Mg 2+ @ZIF-8 can be used for biosensing of nitrofen with wide detection range (0-50 μM), low detection limit (0.47 μM) and good recovery rate.
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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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高影响因子
CHEMICAL ENGINEERING JOURNAL
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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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高影响因子
JOURNAL OF POLYMER RESEARCH
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2022
·Vol. 29
·期 7
·1-8
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IF 3.061
Liu Yuhao,Wang Jieqi,Chen Liping,He Yong
In order to enhance the adsorption and photocatalytic property of polyphenylene sulfide (PPS) melt-blown film, PPS melt-blown film was modified by loading ZIF-8 nanomaterial on the surface of the film via a simple solvothermal water method, the PPS melt-blown film was impregnated in advance. Film performance was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), X-ray diffraction (XRD). Results from FTIR and XRD showed that ZIF-8 was introduced into the modified PPS film successfully. The modified PPS film was endowed with excellent adsorption and photocatalytic compared with the original PPS by the result of enhanced dye removal. The removal rate of methyl blue (MB) by PPS/ZIF-8 film within the range of pH = 3–11 of the environmental solution were more than 80%, up to 99.1%. The dye removal rate still remained 80% after 5 repeat cycles, showed that the modified film has good stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yu Zhu,Qinyun Xv,Dan Wang,Bingxin Sun,Yujia Wang,Zhiguo Han,Yongbo Gou,Jiayu Liu,Bingdong Li
The overuse of norfloxacin (NOR) has attracted wide attention because of the persistence and bio-accumulate in ecosystems and the negative impacts on human health. To solve the environmental issue, BiOI/TiO 2 p-n heterojunctions have been developed and decorated with a porous ZIF-8 to obtain novel hollow BiOI/TiO 2 /ZIF-8 heterojunctions, which were further characterized by XRD, SEM, HRTEM , XPS , BET, UV–vis DRS, photoluminescence , ESR , photocurrent and EIS analyses. The BiOI/TiO 2 /ZIF-8 heterojunctions exhibited evidently improved photocatalytic performance compared with pristine BiOI , TiO 2 and BiOI/TiO 2 composites under visible light irradiation. ZIF-8 plays a key role in both the enhancement of adsorption and the photocatalytic activity in NOR removal. ·O 2 - and ·OH radicals were the two dominating active species in the photocatalytic process according to the trapping experiments. In 2-BTZ system, large specific surface area, highly effective charge carrier migration with inhibiting recombination, more negative CB and positive VB to generate more active ·O 2 - and ·OH species resulted in superior photocatalytic activity. This work provides a new idea to design a kind of photocatalytic heterostructure with more active species for potential application in the field of environmental treatment.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Wenjun Zhu,Sylvestre Ndayiragije,Xiaohua Zuo,Xiaofei Zhang,Guanghui Wang,Xiaobo Wang
Single-atom Cu and N co-coordinated porous carbon (Cu-N-C) was synthesized by hydrothermal-calcination using zinc zeolite imidazole frameworks (ZIF-8) as the precursor. The catalyst showed excellent adsorption and catalytic ability due to the ideally-dispersed single atomic copper sites and the unique nitrogen-doped porous carbon. The complete removal of sulfamethoxazole (SMX, 18 mg/L) could be achieved within 40 min of pre-adsorption and 25 min of oxidative degradation in the present of peroxymonosulfate (PMS). The adsorption capacity of Cu-N-C (0.2 g/L) was evaluated to be 58.69 mg/g. The apparent degradation rate constant ( k ) of SMX on Cu-N-C was 0.155 min -1 , which was 14.1 times faster than that on N-C (0.011 min -1 ). From the activation mechanism, it was found that CuN units acted as the main active sites in Cu-N-C for PMS activation . EPR analysis and quenching experiments verified that the reactive oxygen species (ROSs) of SO 4 · - and 1 O 2 were involved in the decomposition and mineralization of SMX. This work provides a new perspective for the development of Fenton-like single-atom catalysts.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Yilin Wang,Chenxi Wang,Li Zhang,Jiaodi Li,Rongjie Li,Qian Fu,Chunyan Li,Pengcheng Zhao,Yixi Xie,Junjie Fei
Kaempferol (KA), an important polyphenolic compound, is able to combat a variety of inflammatory diseases. Here, a ZnWO 4 / porous nanocarbon based electrochemical sensor has been constructed to detect KA for the first time. Innovatively, ZnWO 4 has been synthesized by pyrolysis using ZIF-8 as a zinc source, while porous nanocarbon was introduced. The nanocomposites have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy and demonstrated that Acidified ZnWO 4 /porous nanocarbon has been successfully prepared. Notably, the excellent catalytic properties of ZnWO 4 and the great enrichment ability and conductivity of porous nanocarbon greatly enhanced the detection performance of the sensor for KA with a linear range of 0.009–0.7 μM and a LOD of 2.03 nM. In addition, the sensor has obtained satisfactory results for the detection of KA in actual natural samples (broccoli and kaempferia powder). The reaction sites and redox mechanism of KA were shown by density functional theory. Finally, the sensor is highly sensitive and stable, making it a novel detection method with extremely high potential applications.
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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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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Lei Fan,Yuguo Gong,Jiafeng Wan,Yuhan Wei,Haolin Shi,Chuntao Liu
In this work, flower-like molybdenum disulfide was constructed on the surface of ZIF-8-derived nitrogen-doped dodecahedral carbon (ZNC) for the electrocatalytic degradation of phenol. The flower-like nanostructure of MoS 2 @ZNC contributed to the exposure of more edge-active sites of MoS 2 . At the same time, Mo 4+ and Mo 6+ co-existed in MoS 2 @ZNC, which promoted the generation of H 2 O 2 and •OH, and improved the catalytic activity of composite materials. In addition, electrochemical performance analysis showed that MoS 2 loaded on the surface of ZNC significantly improved the redox capacity of the material, and the composite ratio of MoS 2 and ZNC affected the structure and properties of MoS 2 @ZNC composites. Moreover, the electrochemical performance of prepared MoS 2 @ZNC was evaluated by the generation of hydroxyl (•OH) and the degradation efficiency of phenol. The results showed that MoS 2 @ZNC-2 had an excellent phenol degradation efficiency (98.8%) and COD removal efficiency (86.8%) within 120 min. Furthermore, MoS 2 @ZNC cathode still maintained good performance after being experimented with 20 times, indicated the excellent stability of MoS 2 @ZNC.
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PubMed
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