SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Hongai Zheng,Meilin Zhu,Derui Wang,Yao Zhou,Xin Sun,Shuangyan Jiang,Mengyao Li,Cunzheng Xiao,Daquan Zhang,Lizhi Zhang
Membrane fouling is one of the main impediments that limit the wide application of Polyvinylidene fluoride (PVDF) membrane. In this study, for the first time, we incorporated the cellulose nanocrystal (CNCs) onto Cu-MOF-74 by physical stirring and then coated the composites on the PVDF membrane to ameliorate the antifouling performance. The PVDF membrane with the addition of CNC/Cu-MOF-74 composite showed enhanced hydrophilicity compared with the pristine membrane, which significantly promoted the permeability and antifouling performance. The Bovine serum albumin (BSA) multiple-cycle antifouling results revealed that the flux recovery ratio (FRR) value (76.9 %) was much higher than that of the pristine membrane (60.8 %). The enhancement of recovery flux was correlated with the increased electrostatic repulsion and hydrophilicity of the modified membrane according to the contact angle test and Zeta-potential measurement. Meanwhile, the CNC/Cu-MOF-74 modified membrane showed improved antibacterial efficiency (96.3 % at 4 h) due to the predominant antibacterial efficacy of Cu-MOF-74. The efficiently antibacterial achievement of modified membrane was attributed to the release of Cu 2+ and the generation of •OH. This study proposed a novel modified membrane with excellent antifouling properties and provided new insights into the fabrication of antifouling membranes with outstanding performance.
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POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Congling Shi,Mei Wan,Zhengbo Hou,Xiaodong Qian,Honglei Che,Yueping Qin,Jingyun Jing,Jian Li,Fei Ren,Bin Yu,Ningning Hong
Thermoplastic polyurethane (TPU) is the most used polyurethane, but its highly flammable characteristic restricts its extensive use. In this work, Co-MOF@MXene hybrids flame retardants were synthesized and incorporated into TPU . The flame-retardant characteristics of TPU composites were investigated by cone calorimeter test and thermogravimetric analyzer. Compared with TPU, the peak heat release rate and total heat release rate of TPU/Co-MOF@MXene composites were reduced by 28.3% and 14.5%, respectively; and the smoke production rate and total smoke production of the composites with only 2 wt% Co-MOF@MXene hybrids were also reduced by 58.8% and 47.5%, respectively. Furthermore, the char residues of TPU/Co-MOF@MXene composites were about 2 times that of pure TPU. Systematical characterizations were then carried out to investigate the flame retardant mechanism of Co-MOF@MXene hybrids, highlighting the barrier effects of MXene combined with the catalytic effect of Ti and Co. The hybrids flame retardants greatly benefit the further development of TPU nanocomposites.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 26
·期 10
·2301-2313
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IF 2.747
Liu Yunfei,Dong Shanghai,Wang Liying,Chen Guohua,Hou Yaping,Cao Zhenzhu,Zhang Yongfeng
The purplish-red rod-like crystal structure of novel bimetallic metal–organic-frameworks (MOF) {CoZn[(4,4′-BDA)(Phen)] 2 } n has been obtained by the reaction of Co 2+ , Zn 2+ (the molar ratio Co: Zn = 1:1), 1,10-phenanthroline (Phen) and 4, 4′-biphenyldicarboxylic acid (4,4′-H 2 BDA), in which Zn ions of the previously reported monometallic MOF {[Zn(4,4′-BDA)(Phen)] 2 ·(HCON(CH 3 ) 2 } n are partly substituted by Co ions. The crystal structure of {CoZn[(4,4′-BDA)(Phen)] 2 } n has been characterized by IR, X-ray photoelectron spectroscopy (XPS), and single-crystal X-ray diffraction analysis. Then, the precursors CoZn-MOF-B@C were obtained by adding a surfactant, activated carbon, and NaOH. Its derivative ZnO/CoO@C was used as anode material for lithium-ion batteries, which showed good lithium storage performance. The initial discharge specific capacity of ZnO/CoO@C is 1437.9 mAh g −1 at a current density of 0.2 A g −1 , and after 100 cycles, the specific capacity drops to 741.8 mAh g −1 .
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Catalysts
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2022
·Vol. 12
·期 6
·671
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IF 4.501
Chenhui Qi,Shuaipeng Han,Jialiang Lin,Jianhua Cheng,Kesi Du,Yongyou Hu,Yuancai Chen
Photoelectro-Fenton (PEF) process can continuously promote the occurrence of Fenton reaction and the generation of active species, which is an advanced oxidation technology for pollutant degradation. However, the lack of bifunctional catalysts restricts the development of PEF technology. In this study, the electronic rearrangement MOF-525 modified by metalloporphyrin (named MOF-525-Fe/Zr) was prepared, to load on the carbon felt as a novel cathode catalyst, which is used in PEF process. A series of characterization and photoelectric chemical properties tests combined with DFT calculation showed that the modification of MOF-525 could not only have the large specific surface area and multistage pore structure but also co-stimulate the metal-to-ligand charge transfer (MLCT) and ligand-to-cluster charge transfer (LCCT) by photoelectric synergy. These charge transitions provide periodic electron donor-acceptor conduction paths in MOF-525-Fe/Zr, which can improve the active species formation and transfer efficiency. Owing to their favorable pore and electronic structure as well as stability, MOF-525-Fe/Zr shows great promise for the application in the catalytic process of PEF. Sulfamethoxazole (SMX) degradation was enhanced by MOF-525-Fe/Zr with the TOC removal rate above 75% both in river water and tap water. Finally, the reasonable pathway of PEF catalytic degradation of SMX was proposed by HPLC-MS analysis. In conclusion, this study provides a new idea for reconstructing the electronic structure of MOFs catalyst and broadening the practical application of PEF technology.Keywords:photoelectro-Fenton;MOF-525;metal-to-ligand charge transfer;ligand-to-cluster charge transfer;sulfamethoxazole
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Membranes
·
2022
·Vol. 12
·期 6
·601
·
IF 4.562
Xiaohuan Li,Noor Ul Afsar,Xiaopeng Chen,Yifeng Wu,Yu Chen,Feng Shao,Jiaxian Song,Shuai Yao,Ru Xia,Jiasheng Qian,Bin Wu,Jibin Miao
Every metal and metallurgical industry is associated with the generation of wastewater, influencing the living and non-living environment, which is alarming to environmentalists. The strict regulations about the dismissal of acid and metal into the environment and the increasing emphasis on the recycling/reuse of these effluents after proper remedy have focused the research community’s curiosity in developing distinctive approaches for the recovery of acid and metals from industrial wastewaters. This study reports the synthesis of UiO-66-(COOH)2using dual ligand in water as a green solvent. Then, the prepared MOF nanoparticles were introduced into the DMAM quaternized QPPO matrix through a straightforward blending approach. Four defect-free UiO-66-(COOH)2/QPPO MMMs were prepared with four different MOF structures. The BET characterization of UiO-66-(COOH)2nanoparticles with a highly crystalline structure and sub-nanometer pore size (~7 Å) was confirmed by XRD. Because of the introduction of MOF nanoparticles with an electrostatic interaction and pore size screening effect, a separation coefficient (SHCl/FeCl2) of 565 and UHClof 0.0089 m·h−1for U-C(60)/QPPO were perceived when the loading dosage of the MOF content was 10 wt%. The obtained results showed that the prepared defect-free MOF membrane has broad prospects in acid recovery applications.Keywords:UiO-66;diffusive dialysis;cation separation;acid recovery
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yuting Zhong,Zhirui Wu,Xiaoguang Liu,Ling Li
Establishing strong interfacial interactions through novel support materials and poly-metallic alloys is an effective method to boost the catalytic performance for electrocatalytic alcohols oxidation . Herein, PdBiMn particles embedded pleated layered rGO-modified novel prismatic Al-based metal-organic framework (Al 2 (OH) 2 (H 2 O) 2 [C 10 O 8 H 2 ] or MIL-118A) composites were fabricated via a simple hydrothermal-impregnation reduction approach and employed in ethylene glycol oxidation reaction (EGOR). It is noticed that the strong electronic effects of PdBiMn alloys and the strong adsorption of oxygened species could alter the electronic structure of Pd and facilitate the removal of toxic species, while the rGO/MIL-118A strongly fixes abundant PdBiMn alloys, providing more active sites and accelerating the interfacial electron transfer . Impressively, the forward peak current density of trimetallic PdBiMn@rGO/MIL-118A catalyst is 239.62 mA cm −2 , it is almost 8.86 times greater than that of Pd/C. Additionally, after 3600 s chronoamperometry test, the current density of trimetallic catalyst retains about 75.54% of the initial current density.
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ANALYTICA CHIMICA ACTA
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2022
·
IF 6.911
Tianze Cong,Yifeng Zhang,Hui Huang,Yongpeng Zhao,Chengwei Li,Zeng Fan,Lujun Pan
The sensitivity of surface enhanced Raman spectroscopy (SERS) depends on the construction of “hot spots” and the number of analyte molecules adsorbed onto the substrates. Herein, we have constructed a kind of SERS substrate based on gold nanostars (Au NSs) coated with nickel-cobalt layered double hydroxide (LDH) using a zeolitic imidazolate skeleton as sacrificial template via nickel ions etching. LDH was used as the absorption medium for target molecules, and concurrently prevented Au NSs from agglomeration to improve stability and uniformity of the substrate. Meanwhile, encapsulated Au NSs were used as the enhancement medium for Raman detection. The porous LDH shell around the Au NSs promoted the target molecules to approach the Au NSs, which was certified by the experimental results of UV–Vis absorption and simulation analysis using the density functional theory . The detection of Rhodamine 6G solution with a concentration of 10 −9 M was realized by the AuNS/LDH, and the relative standard deviation of Raman signals was less than 10%. Therefore, this work provides a new idea and a suitable structure to improve SERS signal intensity by introducing adsorption medium into the SERS substrate.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Zhizhou Liu,Tong Wang,Liang He,Xueyan Nan,Xuming Sun,Pengli Bai
Bacillus anthracis, an extremely dangerous bacterium which can cause pulmonary anthrax and be used as biochemical weapon agent, can be detected by the detection of its major biomarker 2, 6-pyridine dicarboxylic acid (DPA). Herein, we reported the solvothermal synthesis of a non-luminescent NH 2 -BDC-Eu-MOF using Eu 3+ and 2-aminoterephthalic acid (NH 2 -BDC). The emission of amino ligand and Eu 3+ ions are absent in ethanol while the addition of DPA could recover both emission at 460 and 624 nm respectively. Thus this MOF can act as a dual emission ‘‘turn-on’’ probe for DPA detection. The detection limits (LOD) of this DPA probe are about 0.8 μM in ethanol and 0.36 μM in water, which are much lower than an infectious dosage of bacillus anthracis spores (60 μM) for human being. In order to monitor DPA levels more conveniently, we developed a one-to-two decoder logic gate operation, which can determinate DPA via color discrimination.
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E-POLYMERS
·
2022
·Vol. 22
·期 1
·399-410
·
IF 3.074
Jiawen Wang,Ye Sun,Xuemei Zhao,Lin Chen,Shuyi Peng,Chunxin Ma,Gaigai Duan,Zhenzhong Liu,Hui Wang,Yihui Yuan,Ning Wang
Although metal–organic frameworks (MOFs) own excellent uranium adsorption capacity but are still difficult to conveniently extract uranium from seawater due to the discrete powder state. In this study, a new MOF-based macroporous membrane has been explored, which can high-efficiently extract uranium through continuously filtering seawater. Through modifying the UiO-66 with poly(amidoxime) (PAO), it can disperse well in a N,N -dimethylformamide solution of graphene oxide and cotton fibers. Then, the as-prepared super-hydrophilic MOF-based macroporous membrane can be fabricated after simple suction filtration. Compared with nonmodified MOFs, this UiO-66@PAO can be dispersed uniformly in the membrane because it can stabilize well in the solution, which have largely enhanced uranium adsorbing capacity owing to the modified PAO. Last but not least, different from powder MOFs, this UiO-66@PAO membrane provides the convenient and continuously uranium adsorbing process. As a consequence, the uranium extraction capacity of this membrane can reach 579 mg·g −1 in 32 ppm U-added simulated seawater for only 24 h. Most importantly, this UiO-66@PAO membrane (100 mg) can remove 80.6% uranyl ions from 5 L seawater after 50 filtering cycles. This study provides a universal method to design and fabricate a new MOF-based adsorbent for high-efficient uranium recovery from seawater.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Mengtong Xia,Yu Yan,Haiyan Pu,Xuening Du,Jingyi Liang,Yaning Sun,Jiani Zheng,Yue Yuan
In photodynamic therapy (PDT), the concentration of reactive oxygen species (ROS) generated in cells directly determines the therapeutic effect. However, excessive glutathione (GSH) concentration at the tumor site and hypoxic environment strongly reduce the production of ROS. Nitric oxide (NO) has a variety of anti-tumor activities, including the induction of cell apoptosis and sensitization to PDT, so it is in the spotlight in the area of cancer intervention. Therefore, it is very innovative to combine NO therapy with PDT and simultaneously reduce GSH content and relieve hypoxia. Metal-organic framework (MOF) is an emerging drug delivery vehicle that can exert photodynamic effects when a photosensitizer is used as its organic ligand. In this study, we constructed a GSH-responsive NO producing nanosystem to enhance ROS production through GSH depletion and hypoxia alleviation. Briefly, nicorandil (Nic) is encapsulated into porous porphyrinic MOF nanoparticles, and hyaluronic acid (HA) is electrostatically adsorbed on the surface of the MOF nanoparticles for CD44 receptor-targeting and prevention of Nic leakage. Notably, the Nic reacts with GSH to produce NO gas with vasodilation and GSH reduction, thus improving oxygen supply for efficient ROS generation. Moreover, the generated NO can further react with superoxide radical anion to produce highly reactive peroxynitrite (ONOO − ) molecules with higher cytotoxicity. Overall, the [email protected] nanosystem combines NO gas therapy with PDT, resulting in a significant increase in ROS production and greatly enhancing the efficacy of PDT.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Shuai Liu,Xiwen Fan,Fang Yuan,Min Sang,Jianyu Zhou,Junshuo Zhang,Shouhu Xuan,Sheng Wang,Xinglong Gong
This work reported a biomimetic shear thickening fluid (STF) with thermally enhanced shear thickening effect for smart vibration attenuation system. It was developed by introducing Zr–fumarate metal-organic framework (MOF) crystals into a solvent mixture comprised of polyethylene glycol , polyacrylic acid and Ca 2+ , which endowed it with the cooperative effect of electrostatic and hydrophobic interactions . As the temperature raised from 25 to 35 °C, the STF containing 55 vol% MOF (STF-55) yielded a favorable shear thickening reinforcement with a notable viscosity growth of 1760-7953 Pa s. Besides, its storage modulus increased from 14 to 3036 Pa at 25–55 °C under a 0.1 Hz shear frequency, revealing a significant improvement in mechanical performance, as also demonstrated by transient shear rheological experiments. STF was incorporated into sandwich structures to improve the damping performance, with the natural frequency and damping ratio investigated at various ambient temperatures. Since the thermal enhanced viscosity could promote energy dissipation , the damping ratio of STF-55 filled sandwich structure obtained a substantial improvement from 0.85% to 1.93% at 25–55 °C. Thus, STF-55 based turbine blade and building damping pile were fabricated, which not only reduced the external vibration stimuli with average responsive accelerations of 7.3 and 0.8 m 2 s -1 , but also presented attenuated levels of 6.9 and 0.6 m 2 s -1 at increasing temperatures, respectively. In conclusion, this work provided guiding approach for highly adaptive vibration attenuation at high-temperature environment.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Mehboob Hassan,Mirza Mahmood Baig,Khalid Hussain Shah,Aftab Hussain,Syeda Aqsa Hassan,Arshad Ali
The synthesis of an economical and efficient bifunctional electrocatalyst for general water splitting is necessary for the fabrication of eco-friendly H 2 energy. Herein, state-of-the-art ZIF-67-based CoSe/MoSe 2 hybrid nanospheres were synthesized and examined as a bifunctional electrocatalyst for Hydrogen evolution reaction (HER) and Oxygen evolution (OER) in basic media. For the first time, a hierarchical well-designed CoSe/MoSe 2 hybrid nanospheres designed with the uniform distribution layered of 2D-MoSe 2 and conductive CoSe nanoparticles are acquired from CoMoO 4 via selenization. Due to its large surface area and extraordinary morphology, it exhibited significant catalytic activity, which leads to a small overpotential of 110 mV for HER and for 240 mV OER along with low Tafel values of 54.24 and 51.98 mV dec −1 , respectively. Surprisingly, the stability is marvelous and also comparable to the standard of HER and OER. The enhancement is endorsed by the increase in conductivity evolved from the porous nanospheres and the collaborative effect of Co/Mo. To deliver a current density of 10 mA per cm 2 for full water splitting 1.56 V is required, which is one of the least reported voltages. Therefore, this work leads to a new class of catalysts for the fabrication of an efficient water electrolyzer.
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