SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Elia Gadallah,Mohamed N. Khalil,Sami Karam,Wael Ali,Jinchao Chen,Xiangmin Xu,Yuan Jing,Fang Li
Designing and fabricating ultrafiltration membranes that possess relatively high permeability while simultaneously maintaining high rejection and improved antifouling properties continues to be a challenge. In this study, we investigated the integration of novel melamine modified Zr-based metal organic frameworks (Zr-MOFs) with nanosheets of graphene oxide (GO) and sulfonated graphene oxide (SGO). These composite materials were synthesized using the solvothermal process and subsequently coated onto the PES membrane surface using the vacuum-assisted dip-coating method. The stability enhancement of the topmost MOF composite layer adhering to the membrane surface is attributed to hydrogen bonding, π-π stacking, and van der Waals interactions. These effects are augmented by the incorporation of polar functional groups such as hydroxyl, carboxyl, sulfonate, and amine groups. The optimized composite membranes incorporating MOFs exhibit enhanced performance, with a permeability of 80.2 L/m 2 h bar, achieving a bovine serum albumin (BSA) rejection of ≥97.8 % and a humic acid (HA) rejection of 98.9 %. Moreover, a flux recovery ratio (FRR) of 89.5 %. To investigate the interactions among the incorporated components, molecular dynamics (MD) simulations were employed in a computational study. The simulations validated hydrogen bond formation and reinforced prior studies, demonstrating the potential of Zr-MOF compositions as effective hydrophilic nanoparticles. The overall results indicate a substantial enhancement in membrane performance and underscore the high potential for practical applications.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Haibo Ouyang,Guibiao Li,Cuiyan Li,Jianfeng Huang,Jie Fei,Jing Lu
C/C-Zr-Si-O composites were prepared by carbothermal reduction of hydrothermal co-deposited ZrO 2 , SiO 2 , and C. The bulk density of composites reached 1.71 g/cm 3 with 8 cycles of co-deposition. The matrix of the composites includes ZrC, SiC, ZrO 2 , and SiO 2 with fine grain size (300–500 nm) and homogeneous distribution. The mass and linear ablation rate of C/C-Zr-Si-O composites were 0.112 mg/cm 2 ·s and 0.46 μm/s, respectively, under a plasma flame for 120 s. The attractive ablation resistance of the composites resulted from its unique structure, which tends to form a continuous ZrO 2 -SiO 2 glass layer in the ablation center, a layer of SiO 2 -ZrO 2 bubbles in the transition region, and fluffy SiO 2 nanowires layer in the heat-affected region. These ablation layers were barriers to restrain the diffusion of oxidative gas and heat. The C/C-Zr-Si-O composites provide an alternative ceramics system with attractive ablation resistance, while carbothermal reduction of hydrothermal co-deposited oxides is a feasible method for the structural design of carbon fiber reinforced ultra-high temperature ceramic.
研究领域:
材料科学
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航空航天工程
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产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 36
·期 3
·e6556
·
IF 4.105
Wen-Jing Qiu,Ming-Wu Gao,Qi Chen,Ao Zheng,Yi-Jia Shi,Xin Liu,Juan-Hong Li,Guo-Liang Dai,Yang Hu,Zi-Xia Lin
Under normal temperature and pressure, a novel improved Fenton system that was named MHACF-MOF-808(Zr) was constructed after the introduction of Pd/MOF-808(Zr) and H 2 to solve the inherent problem of the production of iron sludge in the classic Fenton system. Only trace amount of Fe II was required during the whole reaction because Fe III could be rapidly reduced by the active hydrogen derived from the adsorption and activation of H 2 on the surface of Pd/MOF-808(Zr) composite. The concentration of Fe II could be maintained more than 10 μM. The removal of target pollutant sulfamethazine in this system was mainly relied on the degradation of ·OH verified by both of the direct detection and indirect inhibition (using methanol). By using the calculation of Laplacian bond order, the degradation pathway of sulfamethazine followed by the cleavage of N S bond. This prediction was verified by the detection of intermediate products. Only 21% sulfamethazine could be degraded after 3-h reaction in the classic Fenton reaction system, while it could be thoroughly degraded in 1.5 h in the MHACF-MOF-808(Zr) system. The influence of main parameters on the degradation effect of sulfamethazine, such as initial pH, the flow of H 2 , dosage of Pd/MOF-808(Zr), concentration of sulfamethazine, ferrous, and hydrogen peroxide, were systematically studied. Based on the relative stability of Pd/MOF-808(Zr) confirmed by the morphological characterization, sulfamethazine could be efficiently degraded in the MHACF-MOF-808(Zr) system.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2022
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IF 3.752
Xuejing Wang,Juan Xu,Sifan Liu,Wenwen Yang,Yanmei Chen,Yanhui Zhang
The research of metal organic frameworks materials of possessing semiconductor performance is important because they show great prospects on applications in wastewater treatment . In the current work, composites of TiO 2 / MOF-801(Zr) was prepared by a wet impregnation at room temperature , and a series of characterizations for catalysts, such as XRD , TEM , XPS, etc was investigated. The results of photocatalytic reduction of Cr(Ⅵ) under simulated solar light irradiation showed that 50%TiO 2 / MOF-801(Zr) exhibited better photocatalytic activity compared with other catalysts, which is attributed to synergistic effect including the interface enhancement effect and the enhancement of photogenerated carriers separation efficiency. The photocatalytic efficiency is as high as 98.1% when adjusting pH of reaction system to 1. It is most likely because the hydrogen cation concentration increased along with the increasing acidity, so that as to the promoting of reduction process of Cr(Ⅵ). In addition, we proposed a possible reaction mechanism of TiO 2 / MOF-801(Zr) composites for photocatalytic reduction of Cr(Ⅵ).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2022
·
IF 12.545
Xiaohai Yan,Gengan Du,Hong Chen,Qiannan Zhao,Qi Guo,Jianlong Wang,Zhouli Wang,Wei Song,Qinglin Sheng,Yane Luo,Yahong Yuan,Tianli Yue
Patulin (PAT) is an unsaturated lactone mycotoxin primarily produced by Penicillium expansum and Aspergillus clavatus . Given the potential health risks and economic losses associated with PAT, the rapid detection of PAT using fluorescent aptasensors is of significant importance in evaluating food safety. However, it easily increases the cost and complexity caused by signal labeling. We combined TCPP/BDC-NH 2 mixed ligands functionalized Zr metal–organic frameworks (Zr-MOF mix ) and terminated three-stranded DNA gates (ttsDNA gates) to fabricate a label-free fluorescent aptasensor for PAT detection. The Zr-MOF mix system was synthesized via a one-pot strategy and could be used to address the problem of pore size limitation and increase the loading amounts of dyes. TtsDNA gate was integrated into the Zr-MOF mix system to control the release of dyes, exhibiting a high signal-to-background ratio. The single-stranded aptamer region in ttsDNA gate situated away from the surface of the Zr-MOF mix , resulting in a natural release of dyes in the absence of PAT. While binding to PAT resulted in target-induced conformational changes that helped form the hairpin structure of the aptamer. This structure hindered the release of dyes from the pores of Zr-MOF mix , thus reducing the fluorescence signals intensity. The stimuli-responsive DNA-gated material provides a platform for PAT analysis under conditions of a low limit of detection (0.871 pg/mL). Furthermore, the excellent specificity and anti-interference of the fluorescent aptasensor make the system suitable for the analysis of apple juice samples. This label-free strategy is cheaper and simper compared with labeled detection, especially for the development of multi-target-detection.
研究领域:
食品安全
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生物传感
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2020
·
IF 4.551
Jun Yao,Ming Xie,Yang Li
In order to protect human health from the threat of excessive acrylamide in heat-processed foods, swift, uncomplicated, highly selective and sensitive online monitoring methods for acrylamide are urgently needed. In this study, a rare earth metal/transition metal-organic frameworks Eu/Zr-MOFs fluorescence sensor with dual-band luminescence was prepared by the solvothermal method for detection of acrylamide in fried potatoes and cookie crumbs. This sensor exhibited two different fluorescence emission peaks at 430 and 615 nm under excitation of 365 nm, and the ratio of fluorescence intensity was linear with the experimental concentration of acrylamide in the range of 1 × 10 −4 to 1 × 10 −3 M. Under the optimal conditions, the proposed fluorescence analysis method showed that the detection limit of acrylamide was as low as 2.4 × 10 −8 M, and the satisfactory recoveries of 94.05–104.04% were obtained for various spiked samples. More importantly, the sensor has ultra-high selectivity for the detection of acrylamide while other small organic molecules hardly interfere with it in the measurement environment. These studies confirmed that the ratiometric fluorescence sensing method was expected to achieve on-line rapid detection of acrylamide in real foods. In addition, the mechanism of Eu/Zr-MOFs sensing of acrylamide was analyzed and discussed in depth, and the analog computation was carried out by Materials Studio software, and the entire sensing system was studied at the micro level in combination with density functional theory.
研究领域:
分析化学
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食品安全
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 8
·3213-3222
·
IF 8.1
Wen Zihao,Meng Hong,Jiang Shengda,Tang Zhongyu,Liu Yiwen,Chu Yanhui
Developing superior oxidation resistance of high-entropy diborides is critical for extending their potential applications in harsh environments. Herein, we developed non-equimolar (Hf,Zr,Ta,W)B 2 high-entropy diborides with superior oxidation resistance by adjusting W contents for the first time. The as-fabricated (Hf 0.28 Zr 0.28 Ta 0.28 W 0.15 )B 2 samples are predicted to possess superior oxidation resistance at 1473–1773 K through the oxidation depth quantitative analysis obtained by machine learning, which is attributed to the reason that the moderate WO 3 can effectively inhibit the volatilization of B 2 O 3 . Furthermore, a four-layered structure is found in the generated product layers at 1773 K, which is due to the preferential oxidation of Hf and Zr elements at low oxygen partial pressure and the different diffusion activation energies of oxide products. The preferential oxidation of Hf and Zr elements is further demonstrated by the computational phase stability diagrams, and oxygen adsorption energies and charge transfer between oxygen atoms and different metal adsorption sites via first-principles calculations. Such superior performance endows (Hf 0.28 Zr 0.28 Ta 0.28 W 0.15 )B 2 with potential applications as ultrahigh-temperature structural materials.
研究领域:
材料科学
·
高温材料
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计算材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Chengqiang He,Yue Sun,Yingpeng Gu,Hongyu Ji
Generally, the pH of fluorinated groundwater or many industrial wastewater is neutral, while the majority of metal-modified adsorbents can work efficiently only under acidic conditions. In this study, we synthesized a novel hybrid adsorbent, Mg–Zr-D213, by loading nano-Mg/Zr binary metal (hydrogen) oxides in a strong-base anion exchanger, D213, to enhance the adsorption of fluoride from neutral water. Mg–Zr-D213 exhibited a better fluoride-removal capacity in neutral water than monometallic modified resins. Under the interference of competing anions and coexisting organic acids, Mg–Zr-D213 exhibited superior selectivity. The Langmuir model indicated that the fitted maximum sorption capacity of Mg–Zr-D213 was 41.38 mg/g. The results of column experiments showed that the effective treatment volume of Mg–Zr-D213 was 8–16-times higher than that of D213 for both synthetic groundwater and actual industrial wastewater, and that NaOH–NaCl eluent could effectively recover more than 95% of fluoride. Adsorption experiments with Mg/Zr metal (hydrogen) oxide particles and D213 separately demonstrated a synergistic effect between –N + (CH 3 ) 3 and Mg/Zr metal (hydrogen) oxide particles. The ligand exchange or metal-ligand interaction of Mg/Zr metal (hydrogen) oxide particles on fluoride was further demonstrated via X-ray photoelectron spectroscopy. Overall, Mg–Zr-D213 has great potential for enhanced fluoride removal in neutral water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Ping Chen,Yalan Wang,Xiaoqin Zhuang,Haijin Liu,Guoguang Liu,Wenying Lv
Zr-based metal-organic frameworks (MOFs) have been developed in recent years to treat heavy metals, e.g. hexavalent chromium Cr 6+ pollution, which damages the surrounding ecosystem and threaten human health. This kind of MOF is stable and convenient to prepare, but has the disadvantage of low adsorption capacity, limiting its wide application. To this end, a novel formic acid and amino modified MOFs were prepared, referred to as Form-UiO-66-NH 2 . Due to the modification of formic acid, its specific surface area, pore size, and crystal size were effectively expanded, and the adsorption capacity of Cr 6+ was significantly enhanced. Under optimal conditions, Form-UiO-66-NH 2 exhibited an excellent adsorption capacity (338.98 mg/g), ∼10 times higher than that reported for unmodified Zr-based MOFs and most other adsorbents. An in-depth study on the photoelectronic properties and pH confirmed that the adsorption mechanism of Form-UiO-66-NH 2 to Cr 6+ was electrostatic adsorption. After modification, the improvement of Cr 6+ adsorption capacity by Form-UiO-66-NH 2 was attributed to the expansion of its specific surface area and the increase in its surface charge. The present study revealed an important finding that Form-UiO-66-NH 2 elucidated selective adsorption to Cr 6+ in mixed wastewater containing toxic heavy metal ions and common nonmetallic water quality factors . This research provided a new acid and amino functionalization perspective for improving the adsorption capacity of Zr-based MOF adsorbents while simultaneously demonstrating their pertinence to target contaminant adsorption.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Yanru Zhu,Zhen Zhang,Yunfei Zou,Jian Zhang,Zhe An,Xin Shu,Hongyan Song,Jing He
Catalytic conversion of biomass-derived 5-(hydroxymethyl)furfural (5-HMF) into carbon-increased hydrocarbons as drop-in energy-rich biofuels has received a great deal of concern for the development of sustainable chemical industry. Here, we demonstrate a one-pot conversion of 5-HMF into C 9 -alkanes on one single catalyst, acidic–basic layered double oxides (Mg(Al)(Zr)O) supported CuCo alloy. The well-defined multifunctional catalytic sites with harmonious combination carry out cascade catalysis, affording C 9 -alkanes (including 30% of more value-added branched-cycloalkanes) in 83% yield. The basic–acidic sites on Mg(Al)(Zr)O show high activity for aldol condensation of 5-HMF and acetone, producing 4-[5-(hydroxymethyl)-2-furanyl]-3-buten-2-one (HAc) in a yield of >99%. The engineered Co–Cu–Co linkages on supported CuCo perform efficient hydrodeoxygenation, affording C 9 -alkanes in a selectivity of 96% from HAc. C 9 -cycloalkanes are generated from the cyclization of the corresponding monohydric alcohol intermediates by the synergy of acidic and CuCo sites in the hydrodeoxygenation reaction.
研究领域:
化学工程
·
催化
·
可再生能源
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xu Pan,Junhong Wang,Ye Chen,Qing Wen,Cunguo Lin,Haiping Gao,Zhenghui Qiu,Liuqingying Yang
As a green conversion device, the electricity performance of microbial fuel cell (MFC) was mainly affected by the extracellular electron transfer (EET) process of the biofilm. This paper presented the fabrication and characterization of carbonized derivatives composed with alloy nanoparticles (NPs) derived from Zr-based metal organic frameworks, which exhibited biocompatibility and high electrocatalytic activity. As the results of bioanodes, the charge transfer resistance decreased from 5.60 Ω (Zr-C) to 0.61 Ω (Fe/Ni-Zr-C), and the exchange current density increased from 0.56 mA/cm 2 (Zr-C) to 1.40 mA/cm 2 (Fe/Ni-Zr-C). Electrochemical tests and density functional theory (DFT) confirmed that Fe-Ni alloy NPs promoted the rapid transfer of electrons within the electrode and improved the EET efficiency mediated with the flavin compounds. High throughput sequencing and PICRUSt verified the specific screening function of Fe-Ni alloy for electrogenic bacteria (mainly Geoalkalibacter) and the promoting effect on the expression of flavin-related proteins in biofilm. The maximum power density of Fe/Ni-Zr-C MFC (5.09 W/m 2 ) was higher than that of Ni-Zr-C (4.19 W/m 2 ), Fe-Zr-C (3.58 W/m 2 ) and Zr-C (3.09 W/m 2 ) MFCs. Fe/Ni-Zr-C material can act as an economical and high-performance bioelectrocatalyst to improve the power generation capability of MFC by improving EET rate and energy conversion efficiency of biofilm.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Liman Chen,Yang Yang,Guixiang Wang,Yanli Wang,Simon Ochieng Adede,Meng Zhang,Caishan Jiao,Di Wang,Dashuai Yan,Yibo Liu,Duanjie Chen,Weibing Wang
A new three-layered film was fabricated on magnesium (Mg) alloy via electroplating to guard against corrosion in a chloride aqueous environment, which consisted of an underlying double-layered zinc/copper (Zn/Cu) and a top aluminum–zirconium (Al–Zr) layer. The Zn/Cu underlayers not only impeded the galvanic corrosion between the Al–Zr coating and Mg alloy but also improved the adhesive ability between the substrate and the upper Al–Zr layer. Herein, we discussed the nucleus sizes of Al–Zr coatings at the stage of nucleation carried out with different contents of ZrCl4 in AlCl3–1-butyl-3-methylimidazolium chloride ionic liquid. The sandwichlike three-layered Zn/Cu/Al–Zr coatings were systematically investigated by surface morphology, phase structure, hardness, anticorrosion performances, and first-principles calculations. The corrosion current density declined from 1.461 × 10–3 A·cm–2 of bare Mg to 4.140 × 10–7 A·cm–2 of the Zn/Cu/Al–Zr3 sample. Neutral salt spray testing demonstrated that the Zn/Cu/Al–Zr3 sample showed no evident signs of corrosion after 6 days of exposure. The enhancement of the corrosion protection property was related to the fact that the application of the Cu layer changed the corrosion direction from initial longitudinal corrosion to extended lateral corrosion and the top Al–Zr coating hindered the transmission of aggressive ions. In addition, upon increasing the Zr content in the alloy films, the Fermi energy reduced initially and then increased. The Al–Zr3 alloy with 8.3 atom % Zr showed the lowest Fermi energy (−3.0823 eV), which exhibited the most efficient corrosion protection. These results showed that the prepared three-layered coating provided reliable corrosion protection to Mg alloy and may thus promote its practical applications.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）