PLASMA SCIENCE & TECHNOLOGY
·
2025
·
IF 1.8
Ruiting Jian,Qirui Zou,Jianjun Yan,Bowen Liu,Lijun Sang,Zhongwei Liu
Cr(VI), a hazardous heavy metal pollutant found in wastewater, exerts detrimental effects on biological system and the human body. Efficient photocatalytic reduction of Cr(VI) to Cr(III) using high-performance materials offers a viable approach for chromium decontamination. In the current work, the defective UiO-66-(OH)2 with enhanced photocatalytic activity was developed by the plasma treatment. These defects not only triggered an expansion in mesoporous domains and increased the BET surface area of the UiO-66-(OH)2 system, thereby exposing more adsorption and photocatalytically active sites, but also created additional electron migration pathways, enhancing the separation of photogenerated e-/h+ pairs. When subjected to an operating power of 15 W, chamber pressure at 20 Pa, and a 300-second treatment period, UiO-66-(OH)2 exhibited a removal efficiency of 83 %. This work explored a novel way for the construction of the defective MOFs and broadened the utilizationation of MOFs in the fields of photoreduction of heavy metal ions in water.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 10
·781
·
IF 3.504
Xinli Yang,Nan Wu,Yongxia Miao,Haobo Li
Tungsten oxide (WO3) and boron oxide (B2O3) were irreversibly encapsulated into the nanocages of the Zr-based metal organic framework UiO-66, affording a hybrid material B2O3-WO3/UiO-66 by a simple microwave-assisted deposition method. The novel B2O3-WO3/UiO-66 material was systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2adsorption, ultraviolet–visible diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray phosphorescence, and Fourier transform infrared (FTIR)-CO adsorption methods. It was found that WO3and B2O3were highly dispersed in the nanocages of UiO-66, and the morphology and crystal structure of UiO-66 were well preserved. The B2O3species are wrapped by WO3species, thus increasing the polymeric degree of the WO3species, which are mainly located in low-condensed oligomeric environments. Moreover, when compared with WO3/UiO-66, the B2O3-WO3/UiO-66 material has a little weaker acidity, which decreased by 10% upon the B2O3introduction. The as-obtained novel material exhibits higher catalytic performance in the cyclopentene selective oxidation to glutaraldehyde than WO3/UiO-66. The high catalytic performance was attributed to a proper amount of B2O3and WO3with an appropriate acidity, their high dispersion, and the synergistic effects between them. In addition, these oxide species hardly leached in the reaction solution, endowing the catalyst with a good stability. The catalyst could be used for six reaction cycles without an obvious loss of catalytic activity.Keywords:UiO-66;WO3;B2O3;metal organic frameworks;cyclopentene;glutaraldehyde
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Keli Li,Mengli Li,Changsheng Su,Long Deng,Zheng Yan,Hongxia Shen,Yang Jiao,Xuebo Cao
Abundant porosity, sufficient active sites, and appropriate stability are crucial factors for metal–organic frameworks (MOFs) designed for photocatalysis. Herein, a controllable partial pyrolysis strategy was employed to synthesize hierarchically porous UiO-66-X (X denotes the mass ratio of H2BDC-NH2 in ligands) with adjustable coordinated unsaturated zirconium sites and interconnected mesoporous structure. By taking full advantage of linker instability in MOFs, which is usually viewed as an undesirable trait of MOFs, this controllable thermolysis involved heat treatment of the original UiO-66-X, leading to selective partial decomposition and permanent mesopores within the structure. Meanwhile, dangling functional amino groups could serve as anchoring sites for cocatalyst and CO2 molecules. Cu nanoclusters were successfully incorporated into hierarchically porous MOFs by a structure engineering approach, yielding a novel photocatalyst. A mutually active mechanism was put forward and illustrated in this work. Mechanistic investigation reveals that mesoporous structures in a catalyst not only offer three-dimensional (3D) interconnected gas transport channels but also provide sufficient space for accommodating the introduced Cu nanoclusters, which served as active sites and efficiently induced a CO2 photoreduction reaction. At the optimal ratio, the photocatalyst exhibited superior photocatalytic activity, achieving a CO yield of 121.64 μmol g–1 under 5 h of the stimulated solar irradiation without any photosensitizer.
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
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Douhao Yang,Ruiting Jian,Jianjun Yan,Ao Zhang,Bowen Liu,Zhongwei Liu
Defect engineering has a great effect on the properties of metal–organic frameworks (MOFs). In this study, the defective UiO-66-NH2 MOFs are successfully prepared by a rapid Ar plasma modification method. At certain experimental conditions (15 W radio frequency input power, 20 Pa working pressure, and 120 s Ar plasma modification time), the afforded UiO-66-NH2 shows significant enhancement in photocatalytic reduction of Cr(VI), and a maximum reduction efficiency of 68.5% is obtained. Advanced characterizations show that the plasma treatment generates missing-linker defects within the UiO-66-NH2 structure, which can enhance the separation of photogenerated electrons and holes and improve the photoreduction capability. The findings not only contribute to a better understanding of the relationship between the structure and performance of MOFs but also provide a simple approach for defect engineering of MOFs.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yujuan Xie,Jinghua Han,Fengchao Li,Lingfei Li,Zhenghao Li,Qian Li,Zhaoting Shang,Wangting Lu,Yazhen Wang,Fan Yu,Wei Yan,Yun Zheng,Jiujun Zhang
Introducing advanced conductive nanoparticles to combine with metal-organic frameworks (MOFs) as electrode is emergingly regarded as a practical and efficient approach to improve the capacitive performance of supercapacitors. Herein, a new MOF (ZrNi-UiO-66, Nickel-zirconium 1,4-dicarboxybenzene) is designed to combine with carbon quantum dots (CQDs) to form a composite electrode with high specific capacitance, in which the charge regulation is performed to facilitate the electronic conduction and transfer. Such constructed electrode delivers an enhanced electronic conductivity and an improved specific capacitance of 2468.75 F g −1 @ 1 A g −1 , which is four times of the contrast sample. Meanwhile, the assembled hybrid supercapacitor exhibits an increased energy density and power density, as well as a sustainable stability after 10,000 cycles with a retention rate of 91.6 %. Basing on the study of advanced characterizations and density functional theory (DFT) simulation, the mechanism of significantly improved specific capacitance can be elaborated as the promote electronic conduction caused from narrowed band gap from 3.9 eV or 0.41 eV–0.23 eV, and the increased charge accumulation at the Ni sites in designed MOFs. This work provides new insights for the design and construction of potential energy storage materials based on MOFs and/or advanced carbon-based materials.
研究领域:
材料科学
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能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mingming Peng,Deng You,Hui Shi,Penghui Shao,Wei Ren,Liming Yang,Xin Sheng,Jiachuang Shao,Xuan Ding,Lin Ding,Haozhi Wang,Kai Yu,Xubiao Luo
Metal-organic frameworks (MOFs) with ability to create rich defects in the structures for exposed binding sites are beneficial for wastewater treatment. However, the inter-relation between the defect concentration and heavy metal removal performance still deserves the exploration. Herein, UiO-66-X crystal materials are successfully synthesized in the presence of monocarboxylic acid of acetic, benzoic, and trifluoroacetic acid, and the effect of defect concentration on Sb(V) removal performance is systematically studied. XRD, TG, EPR and XPS characterizations reveal that the addition of modulators increases the content of defects in the UiO-66-X, which is beneficial to improve the sites utilization. As expected, the Sb(V) adsorption properties of UiO-66-AA, UiO-66-BA and UiO-66-TFA are boosted by 54.1%, 140.0% and 197.7% compared to that of pristine UiO-66. Density functional theory (DFT) calculations further confirm that UiO-66-TFA with the most defects exhibits lower adsorption energy and higher charge transfer, significantly improving the uptake performance of Sb(V). Additionally, the UiO-66-TFA successfully removes antimony in actual water from the Tianyi Lake and Ganjiang River with residual concentrations below 5 μg L −1 , meeting the drinking water standard. This work provides guidance for the rational selection of modulators for efficient heavy metal removal from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 1
·2283-2297
·
IF 5.19
Hu Yuting,Wang Shixing,Zhang Libo,Yang Fan
In wastewater, heavy metal Hg causes serious harm to ecology, so it needs to be removed. In this paper, a novel MOF adsorbent (UiO-66-QU) was prepared by modifying UiO-66-NH 2 with 4-quinolinecarboxaldehyde, which was used to selectively remove Hg(II) from water. The adsorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), zeta potentiometer, and X-ray photoelectron spectroscopy (XPS). In order to investigate the Hg(II) adsorption performance of UiO-66-QU, the effect of time, initial concentration, pH, and temperature were carried out. Langmuir model fitting shows that the maximum adsorption capacity of UiO-66-QU for Hg(II) is 556 mg/g at 298 K. The experimental results show that UiO-66-QU has better Hg(II) adsorption capacity than UiO-66-NH 2 . The isotherm is in accordance with pseudo-second-order models. It is indicated that the adsorption process is mainly monolayer chemical adsorption. The thermodynamic parameters also indicate that the adsorption process is spontaneous and endothermic. It has excellent reusability and selectivity. XPS and the zeta potential showed that the adsorption mechanism was the complex reaction of Hg(II) with nitrogenous group. Therefore, the adsorbent has potential application prospects in removal of Hg(II) from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Wood Material Science & Engineering
·
2023
·
IF 2.2
Gang Zhu,Hui Li,Shuduan Deng,Chaoling Zhang,Kaiqian Li,Xupeng Zhang
In this work, a novel Cu–UiO-66/wood composite was successfully fabricated by a facile in situ growth strategy, and the influence of Cu–UiO-66 metal-organic framework (MOF) loading on the wood substrate thermal stability and flame retardancy were investigated. Scanning electron microscopy images indicated that the octahedral Cu–UiO-66 microparticles were uniformly and firmly decorated on the lumen surface within the balsa wood scaffold. The incorporation of only 6.5 wt% Cu–UiO-66 MOF remarkably enhanced the thermal stability and flame retardancy of the natural wood. Compared with the untreated wood, the peak heat release rate of the Cu–UiO-66/wood composite exhibited a drastic decline by 73.1% from 94.5 to 25.4 W·g−1 and the total heat release from 7.7 to 5 kJ·g−1. Meanwhile, the treated wood had a strong self-extinguishing ability and the char residue rate of the Cu–UiO-66/wood is significantly increased by 132.7%. Therefore, this work provided an effective means of achieving the fire safety wood via introducing and constructing Cu–UiO-66 MOF flame retardants material.
研究领域:
材料科学
·
防火工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Shilin Wang,Shuaikang Fan,Zhou Fang,Yue Hu,Mengyang Dong,Xinsheng Peng
Stimuli-responsive conductive MOF nanoporous materials have been considered to have great potential for photoelectric conversion, information processing, bioelectronics, and smart devices. However, light-regulating hydroxide ion conduction of MOFs is rarely reported. Herein, a reversible optical switch on hydroxide ion conduction has been achieved based on the intrinsic localized photothermal heating of NH2-UiO-66 nanoparticles. The amino group on the organic ligand of NH2-UiO-66 can build a hydrogen-bond network with water molecules to promote hydroxide ion transport in the nanochannel and cause an absorption band in the visible light region. Irradiated by visible light, NH2-UiO-66 nanoparticles can absorb light and convert it into heat, resulting in partial removal of water molecules in the nanopores and destroying the hydroxide ion transport path. Then, the hydroxide ion conductivity decreased by 2 orders of magnitude. When turning off the light, the hydroxide ion conductivity can restore quickly. This work will promote the development of remotely controlled hydroxide ion conductive smart devices.
研究领域:
材料科学
·
光电转换
·
智能设备
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zun Man,Yang Meng,Xiaochang Lin,Xiaorong Dai,Leiping Wang,Dezhao Liu
The photocatalytic activity of titanium dioxide (TiO 2 ) for the purification of odour pollutants, containing reduced sulfur compounds (RSCs), could be largely improved by the coupling of porous materials. Herein, UiO-66@TiO 2 nanocomposites with different blending ratios were synthesized via a readily solvothermal method and characterized experimentally by XRD (X-ray diffraction), SEM (scanning electron microscope), FTIR (Fourier transform infrared spectrum), N 2 isotherms, and UV–vis DRS (diffuse reflectance spectra). The photodegradation performance of dimethyl sulfide (DMS) by synthesized UiO-66@TiO 2 was investigated under various photodegradation conditions, including photocatalyst dosage, DMS concentrations and relative humidity. The results showed that the U1T3 (UiO-66:TiO 2 = 1:3) composites exhibited the highest photocatalytic activity, which was about 17.8 and 7.1 times higher than that of pristine UiO-66 and TiO 2 , respectively. This indicates that the intimate contact interfaces between UiO-66 and TiO 2 could promote the separation and migration efficiency of photogenerated electron-hole pairs. When relative humidity increased from 0% to 60%, the photocatalytic activity was enhanced because the moisture could assist to produce more hydroxyl radicals. However, when the relative humidity was further increased to 90%, the excessive water would compete with DMS on the surface of UiO-66 and subsequently weaken the photocatalytic effects. During the cycling experiments, U1T3 showed a stable photocatalytic performance, and the plausible photocatalytic reaction mechanism and reaction pathways of DMS were proposed. With a significant enhancement of photocatalytic performance, UiO-66@TiO 2 nanocomposites could promote the practical applications of MOF-based photocatalysts for the degradation of DMS.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Yating Xie,Nicui Yuan,Hongyang Liu,Lukai Luo,Jun Gong,Xiping Yin,Tengfei Li,Yonghua Zhou
Defect engineering by creating oxygen vacancies (OVs) and heterogeneous frustrated Lewis acid-base pairs (FLPs) emerged as an efficient strategy to enhance the selective conversion CO 2 to CH 4 . Considering the intrinsic FLPs contained in UiO-66-NH 2 (UNH for abbreviation), in this paper, the OVs was introduced therein by fabricating the Ce-doped UNH (denoted as UNH(Ce/Zr)) via one-step solvothermal route. The as-prepared UNH(Ce/Zr) catalyst exhibited the CH 4 yield of 31.02 μmol·g −1 ·h −1 accompanied with the CH 4 selectivity of 93 % and satisfying recycling stability. The XRD, SEM, FT-IR, XPS, TG, TPD and NH 3 in situ DRIFTS and in situ FT-IR characterization results justified that the UNH(Ce/Zr) possess the obviously increased OVs sites and enhanced Lewis acidic and basic properties. Additionally, the photoelectrochemical characterization results showed that UNH(Ce/Zr)−0.014 efficiently improved photogenerated electron-hole separation efficiency and charge transfer rate. It could be concluded that it was the cooperative action of OVs and FLPs that led to the high CH 4 selectivity and CH 4 yield.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaoxue Zhao,Linlin Sun,Xian Jin,Mengyang Xu,Shikang Yin,Jinze Li,Xin Li,Dong Shen,Yan Yan,Pengwei Huo
Z-scheme heterojunction can effectively separate photo-generated carriers and enhance photocatalytic activity of CO 2 reduction. In this work, we report indirect Z-scheme heterojunction of UiO-66-NH 2 /Cu 2 O/Cu, which achieves highly CO 2 photocatalytic conversion to CO. Among these, UiO-66-NH 2 /Cu 2 O/Cu-0.39 (U/C/Cu-0.39) displays the best activity with a CO yield of 4.54 μmol·g −1 ·h −1 , which is 37.8 times higher than that for UiO-66-NH 2 and 50.4 times higher than that for Cu 2 O. Cu not only acts as the electron conductor of the indirect Z-scheme heterojunction to promote the charge carrier transmission, but also acts as the active site of CO 2 reduction. The increase of active sites and the CO 2 adsorption capacity results in the superior photocatalytic performances.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）