INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Ziqi Wang,Kai Bo,Yong Wang,Yongzhen Wang
The development of ethanol oxidation reaction (EOR) catalysts with high performance is an emerging need of direct ethanol fuel cells (DEFCs). Rational design of support materials of platinum-based catalyst can significantly enhance its catalytic performance for EOR. Here, the highly porous nitrogen-doped carbon material (NC-E) from ZIF-8 was synthesized using a novel and simple method assisted by eutectic salts. Compared with the carbon material obtained from ZIF-8 by traditional calcination (NC-T) and carbon black, the NC-E with high surface area and hierarchical pore structure supported Pt–Sn catalyst exhibits improved electrochemical activity and stability.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8271-8276
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IF 3.925
Ying-Xia Du,Lian Liu,Yong-Ke Li,Rui Liu,Wang-Ting Lu,Ji-Xiang Wang,Geng Zhang,Fei-Fei Cao
The preparation of two-dimensional (2D) composite material consisting of an active metal-based phase and carbon matrix is still a challenge. Herein, the 2D bimetal Co-TCPP(Fe) metal–organic framework (MOF) is synthesized and then adopted as the precursor to prepare a 2D composite electrocatalyst for the oxygen evolution reaction (OER). After carbonization and phosphorization, the 2D MOF is transformed into a composite nanoplate formed by Fe-doped CoP nanoparticles and a carbon matrix (Fe-CoP/C). This Fe-CoP/C composite exhibits a favorable OER performance in 1 M KOH with a low overpotential of 290 mV at 10 mA cm−2, which is better than that of counterparts without Fe and 2D morphology. The in situ formed metal (oxy)hydroxide is considered to be the main active species for the OER. The improved OER performance of Fe-CoP/C could be attributed to the Fe-doping in Co (oxy)hydroxide as well as the high electrochemical surface area induced by the 2D nanoplate morphology and conductive carbon network.
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ACS Omega
·
2022
·
IF 4.132
Xu Zhang,Zhaowei Tong,Chao Liu,Lei Ye,Yuwei Zhou,Qin Meng,Guoliang Zhang,Congjie Gao
Metal–organic framework (MOF)-based polydimethylsiloxane mixed matrix membranes applied for alcohol recovery with high permeability and selectivity are drawing more and more attention. However, the design and fabrication of high-quality and stable MOF-based mixed matrix membrane for pervaporation are still a big challenge. Herein, PDMS functionalized MOF-derived nanoporous carbon (P-ZNC) was first explored as compatible nanofiller to mutually blend with polydimethylsiloxane on PVDF substrate to fabricate defect-free mixed matrix membranes via dip-coating and thermal cross-linkng. Induced by UV illumination, hydrophobic modification of MOF-derived nanoporous carbon was successfully realized under mild conditions within one step, simplifying the operation step. By using this facile strategy, we can not only solve the existing problem of agglomeration, but also covalently cross-link MOF derivative with polymeric matrix and effectively eliminate the interface defect between polymer and nanoparticles without any extra steps. The method also gives a good level of generality for the synthesis of versatile stable nanoporous MOF-derived carbon-based mixed matrix membranes on various supports. The prepared PDMS/P-ZNC with commendable structures possessed excellent separation performance in low concentration n-butanol recovery and had a good balance between permeance, selectivity, and stability.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 22
·10682-10689
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IF 3.925
Miaomiao Han,Mengzhen Ren,Zhaohui Li,Lingbo Qu,Lanlan Yu
Nanozymes with the advantages of excellent enzyme-mimicking activity, low cost and high stability have displayed great application potential in diverse fields as replacements for natural enzymes. In this study, a new nanozyme based on an ultrathin two-dimensional metal–organic framework nanomaterial D-ZIF-67 was prepared and characterized. D-ZIF-67 exhibited remarkable oxidase-like activity, which was attributed to the large specific surface area of the two-dimensional sheet structure, as well as its numerous exposed active sites compared with crystal MOFs. In the catalytic process of D-ZIF-67, the hydroxyl radical and superoxide anion played an essential role and facilitated the oxidation of the substrate 3,3′,5,5′-tetramethylbenzidine (TMB) by oxygen. The reducing agent glutathione (GSH) inhibited the catalytic activity of D-ZIF-67 besides reducing the oxidized oxTMB, based on which a simple, sensitive and accurate colorimetric method was developed to determine GSH, with the detection limit of 229.2 nM. This work mainly proposes a new two-dimensional metal–organic framework with high oxidase-like activity and provides a simple and practical platform for visual GSH detection by naked eyes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Nannan Ma,Chuanqi Fei,Jing Wang,Yinling Wang
Metal-organic frameworks (MOFs) have been widely investigated as electrocatalysts for the oxygen evolution reaction (OER). However, their catalytic performance needs to be further improved. Herein, a multi-pronged approach combining multi-metallic MOFs, 2D ultrathin structures and MOF hybridization was attempted. Specifically, the nanocomposite of lamellar NiFe-BTC and nanowire-like cobalt carbonate hydroxide hydrate (CCHH) was prepared on nickel foam (NF) by a two-step method. The as-prepared NiFe-BTC/CCHH/NF nanocomposite displayed excellent OER performance with an overpotential of 270 mV at a current density of 50 mA cm −2 and good stability in 1.0 M KOH. To construct an overall water splitting electrolytic cell, the phosphorization product of CCHH/NF (P-CCHH/NF) with high catalytic activity for hydrogen evolution reaction (HER) was used as the cathode. The water splitting electrolytic cell with NiFe-BTC/CCHH/NF as anode and P-CCHH/NF as cathode was highly efficient and stable, which only needed a voltage of 1.55 V to reach a current density of 10 mA cm −2 . This multi-pronged approach is expected to inspire other researchers to design high-performance OER catalysts.
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BIOCHEMICAL ENGINEERING JOURNAL
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2022
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IF 4.446
Jiacong Wu,Yi Wang,Juan Han,Lei Wang,Chunmei Li,Yanli Mao,Yun Wang
In this work, a mesoporous Zr-based MOF (MP-UIO-66) was first synthesized by biomineralization method using dextran as template and the resultant particles were applied in the immobilization of cellulase . Compared with conventional UIO-66, MP-UIO-66 has more mesoporous channels (4.6 nm) that allow cellulase (3.4 * 12.4 nm) to be entrapped into the channels, improving loading capacity and stability of immobilized enzyme . Specifically, the results showed that MP-UIO-66 had an excellent loading capacity (265 mg g −1 ) for cellulase, and the residual enzyme activity of PVP-cellulase@MP-UIO-66 (PCMU) was still about 83% after 6 cycles. Moreover, the suitable pore structure exposes the active center of cellulase to the external environment, which facilitates the mass transfer of the substrate. Based on Michaelis-Menten constant analysis, the substrate affinity (13.355 mg mL −1 ) and catalytic efficiency (1.311 mL mg −1 min −1 ) of PCMU were better than those of free cellulase (14.525 mg mL −1 , 0.732 mL mg −1 min −1 ).
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CATALYSIS LETTERS
·
2022
·Vol. 152
·期 11
·3437-3446
·
IF 2.936
Yue Yihang,Li Yong,Wang Tingting,Wang Shifeng,Han Lin,Du Chun
A Pd/CeO 2 -M with high methanol oxidation performance was prepared from metal–organic framework (MOF). The reaction results indicate that the Pd/CeO 2 -M could achieve 100% methanol oxidation at 200 °C over the traditional Pd/CeO 2 -C at 350 °C. The high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and Raman show that the Pd was uniformly distributed over the CeO 2 that was rich in oxygen vacancies. The methanol temperature program surface reaction (MeOH-TPSR) demonstrates that the Pd/CeO 2 -M could effectively decompose methanol at a lower temperature with the assistance of oxygen vacancies compared with Pd/CeO 2 -C. Methanol oxidation was conducted with in-situ Raman, CO diffuse reflectance infrared Fourier transformed spectroscopy (CO-DRIFTS) and in-situ DRIFTS to elucidate the reaction mechanism and establish the structure–activity relationship. The oxygen vacancies have participated in the assistance of methanol oxidation, which was revealed via in-situ Raman. The CO-DRIFTS indicates that the chemisorbed CO was more in linear form, which demonstrates that the Pd particles were over CeO 2 -M with a smaller size. The in-situ DRIFTS experiments show the methanol could be further effectively oxidized to bidentate formate over Pd/CeO 2 -M with the assistance of oxygen vacancies. The Pd/CeO 2 -M catalysis and its enhancement mechanism studies provided a potential strategy in the VOC removal catalysis development. Graphical Abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Minghui Xiang,Zhen Lu,Siyang Li,Hui Li,Chen Wang,Jin Zhang,Lide Jin,Chunyang Li
In recent years, new heterogeneous catalysts derived from metal organic frameworks (MOFs) have been widely used in advanced oxidation processes (AOPs). In this work, zeolite imidazole framework-67 (ZIF-67) and sulfide nanozero-valent iron (S-Fe) were used as precursors to prepare S-Fe/Co bimetallic nanoparticles embedded in graphitized carbon (S-Fe/Co@GC) and used to activate peroxymonosulfate (PMS) to degrade tetrabromobisphenol A (TBBPA). Morphological and structural characterization indicated that S-Fe/Co@GC compared to pre-carbonization, the pore size of the material became larger, formed a graphite carbon skeleton with excellent electrical conductivity. In a 0.2 g/L S-Fe/Co@GC and 0.6 mM PMS system, 96.1% of TBBPA (20 mg/L) was degraded within 30 min, and the degradation yielded a total organic carbon (TOC) removal of 56.2% in 60 min. This excellent catalytic activity was attributed to the synergistic effect of graphitic carbon, sulfide nanozero-valent iron and metallic cobalt. Radical quenching experiments and electron paramagnetic resonance (EPR) technology indicated that reactive oxygen species (ROS) included HO • , SO 4 •− , O 2 •− and 1 O 2 , among which O 2 •− plays a leading role in the degradation of TBBPA. Based on the LC-MS analysis of the degradation intermediates, the degradation pathway of TBBPA in the S-Fe/Co@GC/PMS system was proposed. In addition, S-Fe/Co@GC showed a low ion leaching rate, and the regenerated S-Fe/Co@GC still had high catalytic performance. This work will extend the development of MOFs encapsulate functional nanoparticle materials for environmental remediation.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-11
·
IF 6.408
Qiang Yu,Yang Weixia,Zhang Xiaoshuo,Luo Xueli,Tang Wenzhi,Yue Tianli,Li Zhonghong
A nanocomposite was prepared by loading UiO-67 nanoparticles onto porous carbon materials derived from Ce-MOF (Ce-PC) for fluorescence detection of glyphosate. The probe (UiO-67/Ce-PC) exhibits fluorescence emission at 414 nm as the response signal under excitation at 310 nm. The fluorescence enhancement mode of UiO-67 reduces the background interference, and the introduction of Ce-PC provide hierarchical nanostructure and large specific surface area that can increase the contact availability and improve the pre-enrichment effect, ensuring UiO-67/Ce-PC with superior sensitivity. The abundant metal hydroxyl group (M–O-H) of UiO-67/Ce-PC could recognize phosphoryl groups (-PO 3 H 2 ) of glyphosate through ligand exchange, which synergizes with H-bonding interaction and electrostatic attraction to exhibit specificity toward glyphosate. The competitive coordination effects weaken the ligand-to-metal charge transfer (LMCT) and consequently induce the fluorescence recovery. The calibration plot of the fluorescence enhancement response of UiO-67/Ce-PC towards glyphosate was recorded in the range 0.02–30 μg mL −1 with a low limit of detection (LOD) of 0.0062 μg mL −1 , which is superior to the pure UiO-67. In addition, the sensor exhibited high selectivity and satisfactory accuracy and precision with recoveries of 92.1–105.6% and RSDs below 3.4%. This work not only presents a feasible sensor for sensitive and selective determination of glyphosate from cereal samples, but also provides a promising strategy for the design of MOF-based nanocomposites to achieve trace detection of various pollutants. Graphical abstract
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Jingjing Chen,Xiaoli Wu,Chongchong Chen,Yihao Chen,Wenpeng Li,Jingtao Wang
Two-dimensional lamellar membranes featuring well-defined nanochannels hold great promise for efficient organics separation. However, the extensively existed non-selective microdefects within laminate architecture would impair separation efficiency and structure stability of membranes. Herein, defect-free metal-organic framework (MOF) lamellar membrane is facilely constructed by triple-needle electrostatic atomization technology. Specifically, one needle atomizes small-sized Cu-TCPP MOF nanosheets (TCPP = meso-tetra(4-carboxyphenyl)porphyrin) to build lamellar skeleton, and the other two needles meantime atomize Cu 2+ and TCPP to secondary-assemble crystals among nanosheets. In this manner, these non-selective microdefects are subtly sutured by the regenerated crystals with identical chemical components, resulting in a defect-free MOF lamellar membrane with enhanced structural stability. Importantly, this novel secondary-assembly method highly enhances the separation efficiency and meanwhile keeps high organics permeation for MOF membrane, with rejection of 93.8% for Rose Bengal (1.2 nm) and acetone permeance of 86.9 L m −2 h −1 bar −1 . In addition, the multipoint connection between nanosheets and crystals ensures excellent surface shearing and compaction resistance for MOF membrane, permitting high and steady operation performance for over 100 h. This secondary-assembly methodology by one-step process to construct defect-free and steady lamellar membrane provides a new avenue for the development of efficient separation membranes .
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Nan Huo,Dan Li,Siqing Zheng,Wei Deng
Accurate and selective on-site determination of gaseous molecules in real systems has spurred extensive attention because of complicated matrix and low affinities toward analytical interface. Here, we designed a smart film of porous NU-901 wrapping on thiol-magenta modified Ag nanoparticles (TM-Ag@NU-901) as chromogenic and surface-enhanced Raman scattering (SERS) sensor for detection of sulfur dioxide (SO 2 ). Benefiting from the SO 2 -induced nucleophilic addition reaction, the color of TM-Ag@NU-901 can change from deep-red color to pink then to colorless, leading to deterioration of colorimetric intensities and increment of SERS signals. Consequently, TM-Ag@NU-901 film can be used not only as a calibrated scale for visual discrimination towards SO 2 but also as a high-sensitive SERS sensor for credible determination of SO 2 because of their superior extraction performance and affinity toward SO 2 . Importantly, the bimodal strategy offers substantial improvement in accuracy, quantitative performance of SO 2 compared with single-channel method, and facilitates the detection of SO 2 in gas, commercial wine, and food samples in a reliable and rapid feature. The TM-Ag@NU-901 film-based sensing platform is anticipated to pave a venue for in-field applications in various environmental activities and food security.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Qin Zhang,Lijiao Fan,Wenbin Liu,Yuming Xie,Jiangang Li,Guolin Huang
The core–shell structure UiO-66-NH 2 @Ni-MOF was prepared by in-diffusion growth of 2D Ni-MOF on UiO-66-NH 2 using PVP (polyvinylpyrrolidone) as a structural guide. It was applied to the adsorption of U(VI) in aqueous solution. The materials were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS). The UiO-66-NH 2 @Ni-MOF adsorption to U(VI) was investigated experimentally. The study showed that the adsorption of U(VI) onto UiO-66-NH 2 @Ni-MOF was endothermic and spontaneous. At pH 5.00 and 308 K, the adsorption capacity was 581.40 mg/g according to Langmuir model. In addition, the adsorption process can be described by the pseudo-second-order kinetic model. The adsorption capacity was kept at 83.83% of its original one after five sorption–desorption cycles, a promising indication for repetitive usage.
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