IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 8
·979-990
·
IF 3.1
Fu Mengjie,Wang Chun,Lai Xing,Xiao Changfa,Ding Ying
In terms of nanofiltration (NF) membrane development, the properties of membrane substrates and thin-film composite (TFC) structures have become an important factor to determine the separation performances of NF membrane. In this paper, the method of interfacial polymerization assisted by spacer spraying was used to construct the striped structure at nanometer scale. Nanoscale striped structure was prepared successfully on PPTA (poly( p -phenylene terephthamide)) NF surface with 1.3 g/L of UiO-66-NH 2 in the aqueous phase, and the morphology gradually changed to “point shaped” structure when 2.6 g/L of UiO-66-NH 2 in the aqueous phase. The optimized PPTA/UiO-66-NH 2 NF (PU4) membranes were used for dye/salt separation of methylene blue (MB). Compared with the nascent PPTA NF membranes, it showed a higher MB rejection rate of 98.6%, along with permeation flux of 19.79 L/m 2 \(\cdot\) h \(\cdot\) MPa. The salt separation order of the PU4 membrane was Na 2 SO 4 > MgSO 4 > MgCl 2 > NaCl. The rejection rates were 96.3%, 85.4%, 53.2%, and 18.4%, respectively. Under strong acid and alkali conditions, the separation performance was rejected 86.5%, better under alkaline conditions. More importantly, after a six-time recycle, the PU4 membrane showed no significant change in separation performance, suggesting its excellent stability. The novel strategy in this study provided an approach to develop advanced UiO-66-NH 2 membranes toward sustainable molecular separation in environmental applications. Graphical abstract
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Xiangyu Wang,Min Jiang,Iseult Lynch,Zhiling Guo,Peng Zhang,Lisi Wu,Jun Ma
Although Fe/Fe 2 O 3 has potential application compared with nanoscale zero-valent iron (nZVI), its smooth structure largely limits the catalytic performance. To address this challenge, we innovatively constructed highly efficient composite Fe/Fe 2 O 3 @UiO-66 via employing an urchin-like core-shell structure of Fe/Fe 2 O 3 onto UiO-66 through a facile ion exchange precipitation method without inert gas protection. The characterization results show the urchin-like core-shell configuration can extend the life span of Fe 0 and produce more active sites. Besides, the absorption spectrum is broadened by Fe 2 O 3 which has narrow band gap and the high-efficiency separation of photogenerated electron-hole pairs is obtained with the load of Fe/Fe 2 O 3 . Moreover, Two-parameter pseudo-first-order decay model fits well with the reduction and adsorption of composites in the dark reaction, and a plausible pathway for tetracycline (TC) degradation is also proposed. The findings of this research provide a promising method for promoting the catalytic properties of MOF-based materials and Fe/Fe 2 O 3 .
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LANGMUIR
·
2022
·
IF 4.331
Fa-Ting Xie,Yu-Long Li,Tong Yang,Yun-Hui Yang,Rong Hu
Electrochemical nanotags with strong signal input are necessary for a ratiometric electrochemical sensor to overcome the drawbacks of inaccurate detection results. In this paper, the metal–organic framework (MOF) UiO-66 was utilized as an electrochemical signal tag. A stable and strong current response at +0.9 V can be detected in neutral conditions. MicroRNA (miRNA) was employed as the model analyte. Herein, an enzyme-free DNA-walker-based ultrasensitive ratiometric electrochemical biosensor in combination with Zr MOF (UiO-66) signal tags to detect miRNA was demonstrated. In the presence of miRNA, the autonomous walker movement can be initiated by miRNA, leading to the release of biotin-modified fragments. Thus, streptavidin-labeled UiO-66 nanomaterials were not bound to the electrode, generating a low signal response of UiO-66 at +0.9 V. However, the current signal of electrolyte solution as reference at +0.2 V was increased due to the enhancement of electrode conductivity. This ratiometic sensor demonstrated high sensitivity, selectivity, and reproducibility. It can eliminate the disturbance of environmental factors and basic electrode characteristics, providing more accurate signals. A limit of detection (LOD) of 0.17 fM was achieved. Moreover, the method was also used to detect miRNA-21 spiked in real serum samples.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 31
·e52724
·
IF 3.057
Chunhui Du,Jintai Hu,Fen Chen
Polypropylene (PP) porous flat membrane is ultrathin and has high porosity, which is suitable for the support of forward osmosis (FO) membrane. However, its high hydrophobicity is its Achilles heel. In this study, dopamine and UiO-66-NH 2 were co-deposited onto the surface of PP support, and then interfacial polymerization was performed to fabricate a thin-film nanocomposite (TFN) FO membrane. The reaction-generated polydopamine improved the hydrophilicity of PP membrane, and at the same time enhanced the adhering of UiO-66-NH 2 to the support. The experimental results indicated that the UiO-66-NH 2 nanoparticles were anchored evenly on the surface of the support, which improved the water flux of FO membrane from 11.1 LMH (TFC, TFN-0 without UiO-66-NH 2 ) to 20.7 LMH (TFN-0.1, with 0.1 wt% UiO-66-NH 2 ) using 1 mol/L NaCl as the draw solution in FO mode. Compared with TFC membrane, TFN-0.1 membrane also exhibited relative lower specific salt flux (~0.252) and structural parameter (~379 μm). When separating sodium alginate foulant, the normalized water flux recovery ratio of TFN-0.1 was remained 0.89, and most of the fouling was reversible, as for TFC membrane the data decreased to 0.76 after 2 cycles of operation. These results suggested that UiO-66-NH 2 modified FO membrane exhibited good permeation and antifouling property.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Nini Luo,Yue Shu,Chuanlong Zhu,Xiaoxue Cheng,Lixue Chen,Jiang Wang,Rui Liu,Huangxian Ju,Wei Cheng,Qianfeng Xia
The abnormal protein phosphorylation is closely related to a series of diseases including cancers, neurodegeneration, and other immune/inflammatory disorders. However, a simple, accurate, and pragmatic methodology for the direct detection of phosphorylation levels of target proteins is largely unavailable. Herein, a surface plasma resonance (SPR) biosensor was developed to detect phosphorylated protein based on significant SPR enhancement using UiO-66 and its high affinity for phosphate residues. Furthermore, the pH of the incubation buffer and the NaOH concentration in the washing solution to eliminate nonspecific adsorption of nanoparticles on the chip surface were optimized to adjust the surface charges of UiO-66. This improved the specificity and sensitivity of the proposed method. The designed biosensor could distinguish 1% phosphorylated peptides from non-phosphorylated peptides background. Moreover, the method could directly analyze the phosphorylation level of target protein in complex samples such as cell or tissue extracts without requiring a purification step in a single workflow. This simple and robust biosensor is a sensitive, accurate, and pragmatic toolbox to detect phosphorylated proteins without destroying the protein structure and can significantly facilitate phosphoproteomics and clinical diagnosis research.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Ruyi Geng,Huanhuan Jia,Youwei Xie,Dahai Pan,Feng Yu,Binbin Fan
UiO-66 supported metal catalysts have shown high catalytic activity and selectivity to cinnamyl alcohol (COL) in the selective hydrogenation (SHYD) of cinnamaldehyde (CAL), but the roles of missing-linker defects (MLDs) in UiO-66 on the catalytic performance of the UiO-66 supported metal catalysts have less been reported. Here, UiO-66 supports with the different amount of MLDs were used as the supports, and three series of UiO-66 supported Pt (Pt/U) catalysts were prepared by sol-impregnation, wet-impregnation as well as in-situ encapsulation methods, respectively. The influences of the MLDs in UiO-66 on the catalytic properties of the prepared Pt/U catalysts in the SHYD of CAL were investigated. The series of Pt/U-720 catalysts with the more MLDs showed higher CAL conversion and selectivity to COL than the corresponding Pt/U-F catalysts with fewer MLDs. The different preparing methods affect the location and dispersion of Pt species on UiO-66 supports and the metal-support interaction, but the location of the supported Pt species on UiO-66 is the critical factor affecting the catalytic properties of Pt/U catalysts. The presence of the MLDs in UiO-66 is the key to preparing UiO-66 supported Pt catalysts with high SHYD performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Lili Ma,Xueting Feng,Fanghui Cai,Chunyu Sun,Hanming Ding
Metal-organic frame materials are intensively investigated in catalysis due to their outstanding thermal stability, large specific surface area, and ultra-high porosity. In this work, a cobalt-doped zirconium-based metal-organic framework, Co-UiO-66, was synthesized by the hydrothermal approach. Co-UiO-66 could successfully activate peroxymonosulfate (PMS) ions to produce reactive oxygen species for the degradation of rhodamine B (RhB) when it was used as a Fenton-like catalyst. The catalyst with 4% Co in mass in UiO-66 (4% Co-UiO-66) showed the highest degradation efficiency. About 97.3% of RhB (50 ml of 30 mg L −1 ) was degraded in 45 min under simulated sunlight when 10 mg of 4% Co-UiO-66 was used. The degradation efficiency was much higher than that when pure UiO-66 was used. Furthermore, it was even slightly higher than when cobalt ions were used as the activator. The single-atomic dispersion and confinement effect in Co-UiO-66, as well as the strong absorption in the visible light region are responsible for the high catalytic efficiency.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 6
·2567-2576
·
IF 4.569
Aijia Gao,Fangfang Li,Zhi Xu,Changchun Ji,Jing Gu,Ying-Hua Zhou
The development of heterogeneous catalysts for promoting epoxide cycloaddition with carbon dioxide is highly desirable for recycling CO2 and achieving the goal of carbon neutrality. Herein, we designed and synthesized Zr-based metal organic frameworks (MOFs) by implanting functional guanidyl into the framework via mixing different molar ratios of 4-guanidinobenzoic acid (Gua) with 1,4-benzenedicarboxylic acid (BDC). Consequently, a small sized Zr-MOF (∼350 nm) can be prepared by implanting Gua with 20% molar ligands, denoted as UiO-66-Gua0.2(s). Compared to large sized and different guanidyl Zr-MOFs, UiO-66-Gua0.2(s) exhibited an optimal activity on catalyzing epoxide cycloaddition with CO2 in the presence of the Bu4NBr cocatalyst. A yield of 97% for the product of chloropropene carbonate was achieved at 90 °C under 1 atm CO2. The great performance of UiO-66-Gua0.2(s) might be attributed to the synergistic effect of guanidyl groups as hydrogen-bond donors and Zr centers acting as Lewis-acidic sites. In addition, the heterogeneous catalyst of UiO-66-Gua0.2(s) exhibited a great versatility towards converting other epoxides and a satisfactory recyclability for five consecutive runs. Moreover, a plausible reaction mechanism has been proposed for UiO-66-Gua0.2(s) in promoting CO2 epoxide cycloaddition reactions.
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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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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yunlong Li,Miao Liu,Yixian Liu,Lilong Zhou,Jilong Han,Zhengjie Li,Jimmy Yun,Runjing Liu
Two kinds of Ce-doped UiO-66 were synthesized by using CeCl 3 ·7H 2 O and (NH 4 ) 2 Ce(NO 3 ) 6 as cerium precursors, namely Ce(III)- and Ce(IV)-UiO-66. The effect of valence states of cerium precursors on adsorption performance towards Rhodamine B (RhB) was investigated for the first time. Ce atoms are in two valence states of +3 and + 4, where Ce 3+ ions turn their surfaces negatively charged. The higher cerium content (24.8%) and ratio of Ce 3+ /Ce 4+ ions (1.4:1) of Ce(IV)-UiO-66 made its surface more negatively charged, which is contributed to form stronger electrostatic interaction with cationic dyes. The adsorption amounts of RhB were 239.5 mg/g and 431.7 mg/g for Ce(III)- and Ce(IV)-UiO-66, which are 2.38 and 5.11 times higher than pristine UiO-66, respectively. The well-fit Langmuir model and pseudo-second-order model suggest a monolayer chemisorption process. The adsorption mechanism suggests that the electrostatic interaction and the complexation interaction between Ce 3+ and RhB are dominant factors affecting RhB adsorption. Since Ce 3+ severed as adsorption sites, the higher Ce content and stronger electrostatic interaction of Ce(IV)-UiO-66 together promoted its RhB adsorption than Ce(III)-UiO-66. The obtained results help to understand how the mixed-valences of incorporated metals affect the adsorption behaviors of bimetallic MOFs deeply.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Wenqian Zhao,Xu Zhang,Chang Li,Lusheng Xu,Qin Meng,Guoliang Zhang
Adding nanomaterials such as metal–organic frameworks (MOFs) into a polyamide (PA) layer to prepare forward osmosis (FO) membranes for efficient desalination has attracted great attention. However, rational design and preparation of high-quality MOF-based PA nanocomposite forward osmosis membranes still remain a big challenge. In this study, a polyamine (PA) forward osmosis (FO) membrane was fabricated via interfacial polymerization (IP) with the assistance of a UiO-66 nanocomposite interlayer to enhance desalination and antifouling performances. Polydopamine (PDA) and polyethyleneimine (PEI) were codeposited with UiO-66 and formed a hydrophilic nanocomposite intermediate layer. The substrate with the PDA/PEI/UiO-66 interlayer had better hydrophilicity, restricting the diffusion of m-phenylenediamine (MPD) and promoting the formation of a defect-free active layer. In addition, the PDA/PEI/UiO-66 interlayer not only provided additional water channels but also enhanced the interaction of the substrate and PA layer. The water flux of the PA-PDA/PEI/UiO-66 membrane reached 40.0 L m–2 h–1 with a low reverse salt flux (3.2 g m–2 h–1). Moreover, the PA-PDA/PEI/UiO-66(0.1) membrane also possessed excellent antifouling performances with a high flux recovery of 98% and a low total fouling rate of 17%, which were 18.4% higher and 43.3% lower than those of the pristine TFC membrane, respectively. These results presented that the codeposition of the PDA/PEI/MOF interlayer greatly improved the desalination and antifouling performances of the PA FO membrane.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 51
·111039-111050
·
IF 5.8
Dong Shiwen,Liu Xuan,Kong Xianxian,Dong Feilong,Yu Yan,Wang Lizhang,Wang Da,He Zhiqiao,Song Shuang
Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have been proved as efficient catalysts for photocatalytic hydrogen (H 2 ) evolution, thanks to their tunable functionalities, permanent porosity, excellent visible light response, and physicochemical stability. Herein, a series of photocatalysts (termed NUBC) was fabricated by loading different amounts of Zr-UiO-66-NH 2 (NU) onto a benzoic acid–modified covalent triazine–based framework (BC) based on post-synthetic covalent modification. The resulting NUBC catalysts exhibited a type-II Z-scheme heterojunction structure formed via the amide covalent bonds between the amine groups on NU and carboxyl groups on BC. The optimal loading of NU on BC is 30 wt.% (30NUBC) and the corresponding photocatalytic H 2 evolution rate was 378 μmol h −1 g −1 , almost 445 and 2 times than that of NU and BC, respectively. The synergistic effect between the type-II Z-scheme heterojunctions and amide bonds was conducive to boosting visible light harvesting and facilitating charge transportation and separation. Furthermore, the prepared NUBC catalysts show great reusability and stability. Overall, this work sheds light on the design of novel MOF/COF hybrid materials and provides a systematic exploration of their photocatalytic H 2 evolution properties.
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