FUEL
·
2021
·
IF 6.609
Mengchang Zhou,Changsong Zhou,Dong Chen,Hao Wu,Zhen Zhang,Hongmin Yang,Wei Ruan,Yaming Zhou,Zengqiang Tan
Gaseous toluene, one of the volatile organic compounds, has aroused wide concerns in China due to its growing emissions and harmfulness. Herein, novel manganese decorated UIO-66 catalysts (Mn/UIO-66) were prepared by hydrothermal synthesis and applied to the vaporized hydrogen peroxide system for toluene removal. TEM, BET, XRD, ICP, and XPS were used to analyze the chemical and physical characteristics of Mn/UIO-66. A toluene removal efficiency of 82% with the 3-Mn/UIO-66 catalyst in the vaporized hydrogen peroxide system could achieved. The effects of different reaction conditions (reaction temperature, hydrogen peroxide concentration, and initial toluene concentration) on toluene removal were determined. The yield of hydroxyl radical in the Mn/UIO-66 catalyst combined with the hydrogen peroxide system was positively correlated with the Mn decorated ratio. Results suggested that the catalytic performance is related not only to the yield of hydroxyl radical but also to the catalyst specific surface. The intermediate products during toluene removal were analyzed by gas chromatography-mass spectrometry (GC–MS), and the possible reaction pathway of toluene removal was proposed.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Qian Chen,Yi Feng,Rongrong Tian,Jinghang Chen,Anqing Wang,Jianfeng Yao
Photosensitization is a promising way to make UiO-66 visible light responsive. In this work, zirconium (Zr) precursors and synthetic methods (solvent-assisted or nonsolvent-assisted) were found to significantly affect the electric charge and the defect sites of UiO-66. UiO-66 with enhanced adsorption and photosensitized photocatalytic ability was then obtained. When ZrOCl2·8H2O was applied as Zr-precursor in a nonsolvent method, defect rich UiO-66 (UiO–OCl–N) was achieved with higher Cr(VI) adsorbing ability and improved photosensitized photocatalytic ability. Moreover, with the coexistence of Rhodamine B in Cr(VI) solution, photocatalytic performance of UiO-66 can be further enhanced.
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CHEMICAL PHYSICS
·
2019
·
IF 1.822
Xue Song,Pan Yang,Dongxue Wu,Pengxiang Zhao,Xiaochong Zhao,Lijun Yang,Yuanlin Zhou
Metal-organic frameworks have remarkable advantages of high specific surface area, tunable pore structure, species diversity and superior stability causing it be a good adsorbent for methylene blue removal. Here, UiO-66 was prepared by two-step simple method at room temperature, then the effects of water on morphology, crystallinity and adsorption properties of UiO-66 were studied. UiO-66 exhibits good adsorption performance of MB with maximum adsorption amount of 543.48 mg g −1 and good cycling stability.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2019
·
IF 3.973
Zhen Li,Songjian Zhao,Huizhen Wang,Ying Peng,Zhijie Tan,Bin Tang
UiO-66 metal-organic framework (MOF) was introduced as ketoprofen delivery system for treating osteoarthritis (OA), and two different kinds of NH 2 and NO 2 functional groups were grafted into the UiO-66 framework to investigate the effect of functional groups on the drug loading level and release rate. Structural characterization of the samples showed that grafting functional groups had no significant effect on the morphological characteristic and crystal structure of UiO-66. All synthesized MOFs carriers had excellent BET, chemical and thermal stability, though the introduction of NH 2 and NO 2 functional groups were detrimental for these characteristics. Ketoprofen was successfully loaded on the MOFs carriers, and the results of high performance liquid chromatography (HPLC) indicated UiO-66-NH 2 had the highest loading amount (38%). The ketoprofen release experiment manifested that UiO-66-NH 2 exhibited lowest release rate and partial release of ketoprofen (about 65%) even after 72 h due to the high hydrogen bonds capacity and alkaline characteristic of -NH 2 . Furthermore, chondrocyte cytotoxicity experiment manifested that the synthesized MOFs carriers were rather bio-safe, which ensured them to be used as the drug delivery vehicles.
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PubMed
高影响因子
Journal of CO2 Utilization
·
2019
·
IF 5.189
Haoxi Jiang,Qiang Gao,Shutian Wang,Yifei Chen,Minhua Zhang
Carbon dioxide methanation is of great importance for both environment and energy because of the reduction of carbon dioxide emissions and the utilization of carbon source. In this work, UiO-66 was employed as the support for palladium nanoparticles via a sol-gel method to enhance the activity of CO 2 methanation. The physical-chemical properties of as-prepared catalysts were characterized using N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscope (TEM), temperature programmed desorption (TPD), temperature programmed reduction (TPR), thermo-gravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that there was a synergistic effect between UiO-66 and supported Pd. CO 2 could be activated in UiO-66 via its Zr 6 O 4 (OH) 4 nods, while H 2 molecules were dissociated at Pd for further hydrogenation of activated CO 2 . As a result, the catalyst with a Pd loading of 6 wt.% exhibited a high activity with 56.0% of CO 2 conversion and 97.3% of CH 4 selectivity, corresponding to a STY of 856 g·h −1 ·kg cat −1 at 4 MPa and 340 °C.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Lingling Wang,Penglun Zheng,Xuefei Zhou,Mingzhen Xu,Xiaobo Liu
Novel CdS/UiO-66-NH 2 heterojunction photocatalysts have been successfully fabricated via facile water bath deposition. Compared with the traditional preparation technology, such strategy introduces deionized water as solvent, reduces production cost and simplifies the fabrication process of the heterojunction photocatalyst. Characterizations indicate that CdS nanoparticles (NPs) are uniformly interspersed on the surface of UiO-66-NH 2 and the intimate contacted heterojunction interface is generated to prevent recombination of photogenerated charge carriers. CdS/UiO-66-NH 2 with a mass ratio of 1.5:1 (CdS: UiO-66-NH 2 ) exhibits the highest photocatalytic degradation rate for RhB of approximately 92.5% in 40 min and excellent photostability through four recycles. Furthermore, Photoluminescence (PL) spectra, UV–vis diffuse reflectance spectra (DRS), transient photocurrent, electrochemical impedance spectra (EIS), Nyquist plots and Mott-Schottky plots are applied to characterize the photoelectrochemical properties. The observably enhanced photocatalytic performance can be attributed to: 1) larger specific surface area, increased photocatalytic active sites, intimate contacted interface, 2) created n-n type heterojunction, and 3) rapid separation and transfer of photoexcited interfacial charges.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Long Liu,Zhiwei Qiao,Xinfang Cui,Chunjiao Pang,Hong Liang,Peng Xie,Xuan Luo,Zuqiang Huang,Yanjuan Zhang,Zhongxing Zhao
Introduction of targeted defects into microporous UiO-66s for manipulating their three-dimensional size and surface properties can endow them with adsorption and separation areas involving angiotensin-converting-enzyme-inhibitory (ACE-inhibitory) peptides. Three hydrophobic amino acids (AAs) (i.e., proline (Pro), phenylalanine (Phe), and tryptophan (Trp)) having different physical/chemical properties were applied to in situ tailor defects in UiO-66 through targeted incoordination of missing linkers or missing nodes. Characterization results revealed a uniform oval shape of the developed defects with lengths ranging from 1.8 to 3.1 nm, which was also highly consistent with our molecular simulation. Among these three defective UiO-66s, Phe and Trp imprinted UiO-66s significantly promoted the adsorption affinity of small ACE-inhibitory peptides (uptake: 1.25 mmol g–1 for DDFF and 1.37 mmol g–1 for DDWW) and ultrahigh selectivity for DDFF (249) or DDWW (279) from inactive KKKK solution based on a lock-and-key mechanism. As a result, the imprinted UiO-66 showed an enrichment capacity for ACE-inhibitory peptides about eight times higher than that of pristine UiO-66. Therefore, the amino acid imprinting strategy endorsed by its facile and discerning ability can be envisioned to be of great value for small functional peptide separation and oriented enrichment in biomedicines.
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PubMed
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DALTON TRANSACTIONS
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2018
·Vol. 47
·期 33
·11705-11712
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IF 4.099
Cong-Cong Shen,Ya-Nan Liu,Xin Wang,Xiao-Xiang Fang,Zhi-Wei Zhao,Nan Jiang,Liu-Bo Ma,Xiao Zhou,Tuck-Yun Cheang,An-Wu Xu
Metal–organic framework (MOF)-based materials possess numerous attractive characteristics; however, the application of MOF-based photocatalysts in the area of visible-light photocatalytic H2 evolution is still in its infancy. Herein, we develop a series of novel UiO-66-NH2-based composites with embedded NiO nanoparticles via solvothermal treatment and subsequent calcination. Their characterizations demonstrate intimate lattice-level contacts between UiO-66-NH2 photocatalysts and NiO nanoparticles. By optimizing each component, even without noble metal loading, the U6N-NiO-2 sample (the weight ratio of NiO to U6N-NiO-2 is theoretically calculated to be ca. 10 wt%) with 15 mg eosin Y as a sensitizer causes an enhanced H2 generation rate of 2561.32 μmol h−1 g−1 under visible-light irradiation using TEOA as a sacrificial reagent; furthermore, its corresponding quantum efficiency is as high as 6.4% at 420 nm. The H2 evolution activity of U6N-NiO-2 is about 5 times higher than that of the UiO-66-NH2 photocatalyst (denoted as U6N) and 23 times higher than that of U6N-NiO-2 without sensitizer. It is demonstrated that the high efficiency originates from the visible-light generated electrons of eosin Y and UiO-66-NH2, the efficient separation of carriers by the cascaded band structure and more negative CB of NiO as well as the good dispersion of NiO nanoparticles on the octahedral skeleton. This study provides new insights for the design of MOF-based materials without noble metal loading for visible-light photocatalytic H2 evolution.
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CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Hui Qiu,Meichen Ye,Qingqing Zeng,Wenlu Li,John Fortner,LeLe Liu,Luyang Yang
Efficient removal of phosphate by agricultural waste derived materials from wastewater is an effective and economic way to prevent eutrophication and water bloom. In this work, we proposed a novel method to immobilize a water stable metal organic framework UiO-66 nanoparticle within modified wheat straw through in-situ hydrothermal synthesis and obtained the new UiO-66 nanocomposites. As indicated by SEM and BET analyses, UiO-66 is uniformly dispersed on the surface and the inner pores of modified wheat straws. The utilization rate of active sites is significantly promoted after UiO-66 impregnation within positively charged wheat straw (St + @UiO-66) which is more beneficial for UiO-66 dispersion. The saturated adsorption capacity of hybrid St + @UiO-66 is shown to be more than 2 times greater than bulky one under high ionic strength. Compared to commercial anion exchanger D201, St + @UiO-66 exhibits excellent selectivity and preference toward phosphate. The adsorption process is highly pH-dependent and adsorption kinetics data fitted well with the pseudo-second-order model. FTIR and XPS study indicated that hydroxyl groups on the surface of UiO-66 were replaced by phosphate ions and the inner-sphere complexation was formed via establishing Zr–O–P coordination bonds. In addition, St + @UiO-66 could be sustainably employed for phosphate removal through the combination of periodic regeneration and complete regeneration. It is demonstrated that St + @UiO-66 has preferable adsorption of phosphate with improved utilization of active sites, implying great potential as a promising phosphate adsorbent.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zhong Li,Hongfeng Chen,Chong Chen,Qirui Guo,Xue Li,Yuting He,Huijuan Wang,Nengjie Feng,Hui Wan,Guofeng Guan
As a result of the low partial pressure of CO 2 in most industrial waste gases, capturing CO 2 especially at low pressure was a priority. A facile method was utilized to build mesoporous UiO-66s with adjustable pore sizes via crystal defect engineering. The mesopores were generated through the removal of instable Cu clusters and lauric acid after reaction. The pore sizes could be controlled via adjusting the molar ratios of Cu 2+ to Zr 4+ . Moreover, these meso-type UiO-66 MOFs reserved the stability after washing by HCl solution, which was more suitable for modification in harsh environment and CO 2 capture from flue gases or biogases. The most suitable dispersion of appended polyethyleneimine (PEI) inside pores was then achieved via the controllable pore sizes for CO 2 capture. The active –NH 2 from incorporated PEI could interact with CO 2 to enhance the uptake at low pressure and improve adsorption selectivities of CO 2 over N 2 and CH 4 . The high dispersion of PEI also allowed guest molecules to interact with more active sites, which enhanced the affinity between CO 2 and frameworks. The strong interaction between 50PEI@meso-UiO-66-0.2Cu and CO 2 was confirmed by higher isosteric heats of adsorption (Q st ). Even so, the CO 2 uptake of sample was without drop after five cycles, and the sample could be regenerated under a mild condition.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yixin Kuang,Suxin Zhou,Cheng Mao,Xiaoying Feng,Juan Zheng,Gangfeng Ouyang
High-resolution separation of numerous isomers is highly desirable for their high-quality analysis, yet challenging, which puts forward high requirements on the precise design of stationary phase. Herein, flexible 4- tert -butylcalix[n]arenes (TBCx[n]s) with different cavities have been intelligently integrated with in-situ grown UiO-66 coatings, to investigate their separation efficiencies for alkane and substituted benzene isomers. The modifications of UiO-66 with TBCx[n]s have made up for the deficiency of UiO-66 on the separation of ethylbenzene and styrene. The effects of TBCx[n]s on the separation performance of UiO-66@TBCx[n]s have demonstrated distinct regularities, i.e., the effects of TBCx[6] are superior to those of TBCx[8], while the TBCx[4] is the least effective. The baseline separation of all analytes has been achieved by the UiO-66@TBCx[6] column with enhanced selectivity and improved separation resolution (Rs). For the six groups of isomers that are most difficult to separate, the corresponding selectivity and Rs are greater than 1.09 and 5.48, respectively, confirming the outstanding separation performance of the UiO-66@TBCx[6] column and the feasibility of integrating soft supramolecule and rigid MOF.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2024
·
IF 1.1
Zhiwei Zhang,Yilin Ma,Encheng Liu,Junjie Cheng,Fengfeng Chen,Bin Ling,Ningyu Di,Junkuo Gao
Curing agents for epoxy resin (EP) are one of the most important branches in the polymer materials field due to their enormous potential in many fields, but constructing them in a well-controlled curing temperature remains challenging. Herein, a novel curing agent is constructed by the zirconium metal-organic framework (UiO-66) and [P 4442 ] 2 [IDA] through an impregnation method. [P 4442 ] 2 [IDA]@UiO-66 is utilized as a functional nanofiller and curing agent to construct the [P 4442 ] 2 [IDA]@UiO-66/EP nanocomposites. The chemical structures of [P 4442 ] 2 [IDA]@UiO-66 were investigated by XRD, SEM, DSC, and TG characterizations. The various [P 4442 ] 2 [IDA]@UiO-66 with different loading amounts of [P 4442 ] 2 [IDA] were used to investigate the curing behaviors of the EP-51. The DSC results confirm that the curing temperature of the [P 4442 ] 2 [IDA]@UiO-66/EP is higher than that of [P 4442 ] 2 [IDA]/EP. In addition, the kinetic parameters and the activation energy of the curing reaction were acquired according to the fitting of Kissinger equation and Ozawa equation. The drying time of [P 4442 ] 2 [IDA]@UiO-66/EP system at 40 °C was enhanced 17 times compare to that of [P 4442 ] 2 [IDA]/EP system. This study opens new avenues for the rational design of EP nanocomposites by employing ionic liquids@MOFs composite materials as curing agent for wide engineering applications.
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危险品化学品经营许可证（带存储）