MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-9
·
IF 6.232
Hu Peng,Zhu Xiaoming,Luo Xiaohui,Hu Xiaofeng,Ji Liudi
The authors describe a novel electrochemical determination method for bisphenol A (BPA) based on the electrosynthesised Cu-BTC (H 3 BTC: trimesic acid) films. Using H 3 BTC as the ligand, Cu(NO 3 ) 2 as the precursor of copper ions, and triethylamine hydrochloride (Et 3 NHCl) as the probase source, Cu-BTC films were directly deposited on glassy carbon electrode (GCE) surface via cathodic electrochemical reduction under −1.30 V. Considering the electrocatalytic activity of metal center Cu 2+ , Cu-BTC films were applied to construct the electrochemical determination platform for BPA. Chronocoulometry and electrochemical impedance spectroscopy were used to study the signal enhancement mechanism. The determination conditions were optimized. As a result, a sensitive electrochemical method was constructed for BPA. The peak currents, best measured at voltage of 0.496 V vs. SCE (KCl saturated calomel reference electrode), increase linearly in the range from 5.0 to 2000 nM. The value of determination limit is 0.72 nM. The proposed method was successfully applied to determine BPA in spiked urine, spiked waste water samples and plastic products. The results were in good agreement with those obtained for the same samples by high-performance liquid chromatography (HPLC).
Schematics for the construction of electrochemical determination for bisphenol A.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xuemei Wang,Zhen Zhang,Jing Ru,Pengfei Huang,Yuan Ma,Jie Zhang,Xinzhen Du,Xiaoquan Lu
In view of the serious carcinogenic, teratogenic and mutagenic properties of polycyclic aromatic hydrocarbons (PAHs), which cause significant harm to human beings and the environment. Therefore, developing rapid adsorption and efficient analytical methods are research topic with practical significance. Herein, an innovative MOFs@COFs-based molecular trap materials were prepared with hierarchical porous core–shell structure and used as solid-phase microextraction (SPME) fiber coating, which combined with high performance liquid chromatography (HPLC) to achieve the efficient separation, capture, and detection for 7 PAHs in real samples. The possible adsorption mechanism was systematically verified and explained. Under the optimized conditions, the method developed in this experiment had a wide linear range (0.005–400 µg·L −1 ) with a good linear correlation coefficient (R 2 > 0.9984), low detection limits (0.002–0.405 µg·L −1 , S/N = 3) and low quantification limits (0.005–1.351 µg·L −1 , S/N = 10). The relative standard deviations of individual fibers and different batches of fibers were 0.26–3.64% and 0.40–5.91%, respectively. Besides, the fiber showed higher enrichment capacity and extraction efficiency for PAHs compared to commercial SPME fibers and other material fibers, and exhibited excellent acid-base stability and reproducibility. This work provided a favorable synthetic pathway for the preparation of MOFs@COFs composites by layer-modified assembly synthesis strategy, showed excellent practical applicability as a SPME fiber coating combined with HPLC, and could be realized to provide technical support for future studies on the separation, adsorption, and analysis of PAHs in the petrochemical industrial zone of the Yellow River Basin.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
W.H. Qiu,J.N. Ren,C.C. Yuan,Y.F. Li,X.Y. Fan,H.M. Li,M. Oleksandr,S.W. Lu,J.J. Wang,M.W. Zhu
The widespread deployment of 5 G technology has intensified the demand for electromagnetic wave absorption materials to mitigate escalating electromagnetic pollution. Herein, we reported a bioinspired ant-nest-like CoNi@C composite synthesized through a facile hydrothermal method followed by pyrolysis treatment. A lamellar CoNi-MOF precursor was first constructed, and the molar ratio of cobalt to nickel was systematically adjusted to enhance carbon graphitization, thereby tailoring the electromagnetic parameters of the composite. The synergistic interplay between the optimized composition and the unique hierarchical architecture endowed the nanocomposite with exceptional microwave absorption performance. Specifically, the ant-nest-like porous structure facilitated impedance matching, interfacial polarization, and multi-scale attenuation of incident microwaves. The Co 2 Ni 3 @C composite achieved an effective absorption bandwidth (EAB, RL ≤ -10 dB) of 6.47 GHz, with a minimum reflection loss of -50.92 dB at 13.05 GHz with a mere 30 wt% filler loading. This work establishes a versatile MOF-derived strategy for designing high-performance electromagnetic absorbers with ultrawide bandwidth and lightweight advantages.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jiantao Su,Haihong Xia,Fei Ge,Xiaohui Yang,Minghao Zhou,Jianchun Jiang
5-Hydroxymethylfurfural (HMF) is a very important chemical intermediate, while it can be hydrogenated into various value-added chemicals. However, the hydrogenation of HMF over non-precious metal catalysts still remains as a challenging problem. In this study, lignosulfonate (LS) was used as carbon resource, and successfully introduced into MOFs structure. Then, a series of lignin-MOF derived catalysts (Ni n Co-MOF-LS) were prepared by the hydrothermal method with different ratios of Ni and Co metals. The selective conversion of hydroxymethylfurfural (HMF) to 5-methylfurfuryl alcohol (MFA) was achieved over Ni n Co-MOF-LS catalyst in a N 2 atmosphere with isopropanol as solvent. The Ni/Co metal ratios and calcination temperature played a key role in the catalytic performance of the catalyst. The catalysts showed good catalytic performance in the selective hydrogenation of HMF to MFA through an in-depth study of various reaction parameters such as temperature, pressure, reaction time and catalyst dosage. The coordination of lignosulfonate and MOFs provide a novel alternative for the utilization of lignin resource and the upgrading of biomass-derived chemicals.
研究领域:
化学工程
·
生物质转化
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xuewen Chen,Hongping Quan,Zhengyan Zhou,Xiaofeng Zhang,Yuling Hu,Zhiyu Huang
In recent years, nanoporous materials with special structure have been widely used in various fields. In view of the poor stability of MOFs materials and the poor mass transfer ability, in this study, we developed a simple method to restrict the growth of UiO-66-NH 2 crystals in hollow silica by “vacuum evaporation” strategy, different kinds of acid regulators were introduced, to obtain a composite material with hierarchical pore structure. By characterizing the physical chemistry and microstructure of the composite adsorbent, and calculating the structural defects under different acid regulation, the adsorption and desorption performance and stability of the adsorbent for CO 2 were comprehensively investigated. The mechanism of action on CO 2 was further analyzed by in-situ infrared and other techniques. The results show that the change of coordination environment and coordination rate caused by the competition of organic acids, which increases the defects and reduces the nucleation and aggregation effect of UiO-66-NH 2 , promotes the formation of hierarchical pore structure of the composites. Among them, benzoic acid is the best regulating monocarboxylic acid, which makes UiO-66-NH 2 have good dispersion in the cavity and suitable crystal size. The specific surface area of the composite material is 717.96 m 2 g −1 . At the same time, due to its excellent CO 2 adsorption capacity (3.35 mmol g −1 ) at 298 K and 1.06 bar, it is 48.07 % higher than the original UiO-66-NH 2 . In order to accomplish the goal of effective CO2 adsorption performance of composites, this study offers a novel approach for the synthesis and modification of MOFs-based composites.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ziyong Chang,Baili He,Xiaosha Gong,Xiaoyue Qi,Kexin Liu
Preparation of efficient adsorbents is of great significance for the recovery of precious metals from secondary resources. Herein, –NH 2 was successfully grafted on MIL-101(Cr) via hydrothermal reaction to improve the adsorption capacity of Au (Ⅲ) in aqueous solution. MIL-101(Cr)–NH 2 had a huge specific surface area (1016.50 m 2 ‧g −1 ), which can provide more adsorption sites for Au (III). At 298 K, the maximum adsorption capacity of Au (III) by MIL-101(Cr)–NH 2 was 792.43 mg∙g −1 and was higher than that by MIL-101(Cr) (140.83 mg∙g −1 ). The adsorption data was well fitted by Langmuir and pseudo-second-order models, confirming that the adsorption process conformed to single molecule adsorption and chemical adsorption . Mechanism study indicated that the adsorption of Au (III) by MIL-101(Cr)–NH 2 was initiated with electrostatic attraction and promoted by reduction and inner complexation between AuCl 4 - and protonated amino groups. During adsorption, Au (Ⅲ) was reduced to Au (0) and Au (I) by –NH 2 . Density functional theory (DFT) calculation demonstrated that MIL101(Cr)–NH 2 possessed higher binding affinity and more adsorption sites for Au (III) than MIL-101(Cr). Moreover, MIL-101(Cr)–NH 2 exhibited excellent selectivity towards Au (III) and good recyclability, which is promising in the recovery of precious metals.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Boxin Gao,Zhongyi Jiang,Meng Zhao,Hong Wu,Fusheng Pan,Josue Quispe Mayta,Ze Chang,Xianhe Bu
Metal-organic frameworks (MOFs) with high hydrolytic stability are highly needed to prepare polymer-MOFs hybrid membranes working in aqueous solution media. In this study, [Eu(BTB)(H 2 O) 2 ·solvent] n (abbreviated as EuBTB), a kind of lanthanide-based two-dimensional MOFs, was utilized to prepare hybrid membranes for organic solvent dehydration owing to their hydrolytic stability arising from the relatively strong coordination bond between lanthanide ions and oxygen-containing groups. The detailed structure and properties of the hybrid membranes were well characterized. The hybrid membranes exhibited high mechanical strength and swelling resistance due to the strong interfacial interaction benefiting from the well complexation of EuBTB and sodium alginate (SA) through carboxylic groups. The horizontally aligned lamellar EuBTB could render ordered channels with the diameter of 0.5–0.8 nm. Each Eu 3+ in EuBTB could coordinate two water molecules and serves as carriers to facilitate the transportation of water molecules. Moreover, the incorporated EuBTB could render decreased crystallinity. Accordingly, the hybrid membranes exhibited superior permeability and selectivity for ethanol dehydration. Especially, the membrane containing 5 wt% EuBTB exhibited an optimum performance with permeation flux of 1996 g/m 2 h and separation factor of 1160 for 90 wt% ethanol aqueous solution at 350 K. Meanwhile, the hybrid membranes showed good long-term stability. This study may offer a generic and efficient approach to prepare MOFs-based hybrid membranes with high performance and stability for water-selective separation.
研究领域:
材料科学
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化学工程
·
膜技术
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Zhenwu Zhong,Xiaoyu Yang,Zhaoxiang Qi,Ke Zhao,Salman Riaz,Ying Qi,Peng Wei,Min Jae Ko,Jian Cheng,Yahong Xie
Carbon-based MAPbI 3 perovskite solar cells (C-PSCs) have attracted significant attention due to their low cost and stable performance. However, due to inherent structural defects and an energy level mismatch between the perovskite layer and the carbon electrode, C-PSCs still show a poorer power conversion efficiency (PCE) than traditional perovskite solar cells (PSCs). In this study, LaFeO 3 @C nanocomposite particles were successfully synthesized via pyrolysis of La-containing MIL-100(Fe) MOF gel. By introducing these pre-synthesized LaFeO 3 @C bimetallic composite oxide nanoparticles into the carbon electrode, the device featuring a FTO/SnO 2 /CH 3 NH 3 PbI 3 /LaFeO 3 @C/C architecture achieved an impressive maximum PCE of 16.35%, surpassing that of the pristine device by 9.36%. The enhanced optoelectronic performance can be primarily attributed to enhanced interfacial contacts, superior interfacial charge extraction ability, and better electrical conductivity . The LaFeO 3 @C-based device maintained more than 90% of the initial PCE after being stored for 31 days at room temperature and ambient humidity. This study provides a novel strategy for the preparation of efficient and stable C-PSCs from the perspective of spatial structure regulation of bimetallic MOF-based composites.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Wang Deping,Hu Wenming,Fan Wufeng,Xia Xiaohong,Liu Junqiang,Liu Hongbo
Metal-organic frameworks (MOFs) have attracted numerous attentions as anode materials for lithium-ion batteries (LIBs) owing to their unique tunable structures. However, utilizing MOFs in electrochemical devices has been hampered by the inferior electrical conductivity and poor stability that dominate the cycling stability and rate performance of electrodes. Herein, a Ni-PTA/graphene hybrid with porous spherical structure has been successfully constructed by interconnected needle-like Ni-MOFs nanocrystals after the introduction of amine functionalized graphene (NG). The conductivity and structural stability of the composites have been greatly improved due to the chemical bonds formed between the N -containing graphene and the MOFs. When used as anode materials for LIBs, the synthesized Ni-PTA/NG composite shows a superior Li storage with a reversible capacity of 1585 mAh g −1 at a current density of 200 mA g −1 . In addition, Ni-PTA/NG composite demonstrates an ameliorative rate performance (340 mAh g −1 at 5 A g −1 ) and long-term cyclability (570 mAh g −1 at 1 A g −1 after 420 repeated cycles), significantly higher than traditional graphene/MOF composite materials. The novel method in this work paves a new way to form 3D structure by using NG to induce MOF germination, which may be extended to preparing other metal/metal oxides materials for electrochemical energy-storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lulu Guo,Zhen Shen,Chunhui Ma,Chunqiang Ma,Jiaqi Wang,Tingxun Yuan
The development of high response, low detection limit and low-cost acetone sensors remains a great challenge so far. In this work, the high-performance acetone sensors based on Au nanoparticles (NPs)-loaded SnO 2 porous nanosheets were successfully synthesized via metal-organic frameworks (MOFs) template method, which synthesis method is facile and meets the requirements of large-scale production. The acetone sensing characteristics of pristine SnO 2 and Au-SnO 2 -based sensors are investigated. The optimized Au-SnO 2 -based sensor exhibits high response to acetone (R a /R g = 18.2 @100 ppm at 240 °C) with high selectivity and fast response/recovery time compared with that of pristine SnO 2 . Importantly, a fully reversible resistance signal with a low acetone concentration (1 ppm) can be detected, and the theoretical detection limit of the sensor is as low as 40 ppb. Finally, the enhanced acetone sensing performance of the Au-SnO 2 sensor can be attributed to the increased specific surface area and chemically adsorbed oxygen, as well as the formation of Schottky junction between the Au and SnO 2 interfaces.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Wen Hou,Jun Cheng,Leiqing Hu,Yulun Wu,Junhu Zhou
CO 2 capture and storage technologies are crucial for environmental conservation and sustainable progress. To overcome the challenging trade-off between permeability and selectivity in polymeric CO 2 separation membranes , we innovatively fabricated mixed matrix membranes (MMMs) by introducing three different NbOF 5 2− anion-pillared porous metal–organic frameworks (MOFs), namely NbOFFIVE-2-Cu-i, NbOFFIVE-2-Ni-i, and NbOFFIVE-bpy-Ni. The CO 2 capture performance of the three MOFs was investigated for the first time, and the ideal adsorption solution theory (IAST) method was used to predict the CO 2 separation selectivity. Density functional theory (DFT) calculations confirmed that the interaction energy between NbOFFIVE-2-Cu-i and CO 2 is the highest among the three MOFs. This is due to the optimal pore dimensions and strong C δ+ … F δ− electrostatic interaction between the C atoms in CO 2 molecules and the F atoms in NOFFIVE-2-Cu-i. The introduction of the three MOFs into the MMMs led to an increase in CO 2 solubility, resulting in enhanced CO 2 permeability and selectivity. The MMM loaded with 2 wt% of NbOFFIVE-2-Cu-i exhibited exceptional CO 2 permeability and CO 2 /N 2 ideal selectivity values of 578 Barrer and 70, respectively, representing enhancements of 39 % and 29 % compared to neat membrane, and exceeding the upper bound established in 2019.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 18
·10009-10016
·
IF 2.936
Zichen Xu,Guoying Zhao,Latif Ullah,Meng Wang,Aoyun Wang,Yanqiang Zhang,Suojiang Zhang
A facile strategy for the synthesis of acidic ionic liquid based UiO-67 type MOFs was developed in this study. Brønsted acids (H2SO4, CF3SO3H and hifpOSO3H (hexafluoroisopropyl sulfuric acid)) were introduced into UiO-67–bpy (bpy = 2,2′-bipyridine-5,5′-dicarboxylic acid) frameworks by reacting with bipyridyl nitrogen to introduce the properties of an acidic ionic liquid into the frameworks. The prepared catalysts, denoted as UiO-67–HSO4, UiO-67–CF3SO3 and UiO-67–hifpOSO3, were characterized by XRD, SEM, FT-IR, EA, TGA and N2 adsorption–desorption studies. The relatively high surface area was still maintained and acidic active groups were uniformly dispersed in the frameworks. The catalytic performance of UiO-67–HSO4, UiO-67–CF3SO3 and UiO-67–hifpOSO3 was evaluated by the esterification of acetic acid with isooctyl alcohol. The prepared catalysts showed good catalytic activities in the esterification, of which UiO-67–CF3SO3 gave the maximum isooctyl alcohol conversion of 98.6% under optimized conditions. The catalyst could be reused five times without a significant decrease in the conversion of isooctyl alcohol, and almost no active species were leached, indicating the excellent stability and reusability of the catalyst. Our study provides one effective way to synthesize heterogeneous acidic ionic liquid catalysts consisting of isolated, well defined acidic groups that will probably attract interest in acid catalyst chemistry.
研究领域:
材料化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）