Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 36
·9465-9471
·
IF 5.256
Ting Lu,Hongjie Song,Xiaoqun Dong,Jianyu Hu,Yi Lv
NH2-MIL-53(Al) nanorods studded with F− were successfully synthesized via coordination modulation with HF as a modulator. The investigation of the growth mechanism pointed out that F− plays a key role in the formation process. The incorporation of F− into the framework of NH2-MIL-53(Al) not only made the crystal morphology tunable but also magnified the fluorescence enhancement performance of NH2-MIL-53(Al) in water vapor, based on which a highly efficient humidity sensor was fabricated. Among different kinds of humidity sensors, the present sensing system stood out due to its fast response rate, good sensitivity and high selectivity with a low detection limit of 0.6 μg mL−1 (S/N = 3) and a wide detection range from 4 to 40 μg mL−1. On the other hand, a majority of the conventional electronic humidity sensors seriously suffered from temperature dependence, while the present sensing system got over this disadvantage. Therefore, the NH2-MIL-53(Al) nanorod layer-based fluorescence sensing system has the potential for application in the real-time monitoring of humidity under ambient conditions.
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Processes
·
2024
·Vol. 12
·期 9
·1879
·
IF 2.8
Huiying Yang,Xiangchao Meng
The conversion of nitrogen (N2) and water (H2O) into NH3by photocatalysis under ambient conditions has been considered an environmentally friendly strategy. However, developing effective catalysts for N2fixation is still challenging. Herein, we report a bimetallic JH Fe, Co/TiO2derived from NH2-MIL-125(Ti) by the fast Joule heating (FJH) method for visible–light–driven catalytic N2fixation. It was found that the photocatalytic N2reduction efficiency of bimetallic FC@TiO2-JH was improved, enabling an NH3yield rate of 110.14 µmol g−1h−1without any sacrificial agents. Furthermore, the rate was higher than those of Fe@TiO2-JH and Co@TiO2-JH, suggesting that the synergistic effect between Fe and Co broke the electronic equilibrium and increased the center of its d-band, enhancing electronic feedback to the antibonding π* orbitals of N2while weakening the bonding energy of N≡N. Meanwhile, the rate was about 2.75 times higher than that of FC@TiO2-TF, which was calcined in a tube furnace. It is assumed that FJH might lead to the formation of lattice defects, leading to localized charge deficiency, enhanced carrier separation, and transport. Thus, doping of Fe and Co synergistically interacted with the defects produced from FJH, facilitating the photocatalytic reduction process. As detected, it had a greater ability to separate hole–electron pairs and transferred electrons to adsorbed N2at faster rates. Our work demonstrates a prospective strategy for designing bimetallic catalysts derived from NH2-MIL-125(Ti) for N2fixation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Qingqing Wang,Wei Zhou,Claudia Li,Sibudjing Kawi,Yinhui Li
The application of photocatalysts in environmental field has emerged as a prominent research topic. Nevertheless, the efficiency of photocatalysts is reduced as the recombination of photogenerated chargers significantly, restricting their extensive use in this domain. In the present study, photocatalysts composed of bismuth molybdate/NH 2 -UiO-66(Zr) (Bi 2 MoO 6 /NH 2 -UiO-66(Zr)) featuring Z-scheme heterojunctions were effectively synthesized using a two-step hydrothermal technique. These photocatalysts exhibit remarkable photocatalytic degradation under visible light conditions. Notably, the broad planar configuration of Bi 2 MoO 6 sheets improves the separation of the photogenerated charge carriers. NH 2 -UiO-66(Zr) layered atop Bi 2 MoO 6 sheets enhances the availability of catalytically active sites, reduces charge recombination, and promotes charge transfer through the interface. The kinetic rate constant for Bi 2 MoO 6 /NH 2 -UiO-66(Zr) is around 0.00329 L mg −1 min −1 , indicating the increase of 3.78 and 41.13 times compared with pure Bi 2 MoO 6 and NH 2 -UiO-66(Zr), respectively. The efficiency for photocatalytic degradation of tetracycline using Bi 2 MoO 6 /NH 2 -UiO-66(Zr) reaches 81.72 % under visible light. Importantly, this efficiency exhibits a reduction of 10 % after five recycling cycles, demonstrating notable stability. The photocatalytic mechanism involved in tetracycline degradation was uncovered through trapping experiments and EPR, indicating that it is predominantly facilitated by the active oxidation of ·O 2 - and ·OH. The intermediates of the photocatalytic process as well as the possible degradation pathways were discussed. The creation of Bi 2 MoO 6 sheets/NH 2 -UiO-66(Zr) heterojunction photocatalysts provides a fresh approach to the development of novel catalysts, which may lead to significant advancements in environmental remediation efforts.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2016
·
IF 3.902
Wei Zhuang,Linjiao He,Jiahua Zhu,Jianwei Zheng,Xiaojing Liu,Yihui Dong,Jinglan Wu,Jingwei Zhou,Yong Chen,Hanjie Ying
The use of graphene oxide (GO) nanosheets for functional enzyme support has attracted intensive interest owing to their unique planar structure and intriguing physical and chemical properties. However, the detailed effects of the interface properties of GO and its functionalized derivatives on active biomolecules are not well understood. We immobilize nuclease P 1 , a common industrial nucleic acid production enzyme, on pristine and amino poly(ethylene glycol) (PEG-NH 2 ) modified GO nanosheets with interface property heterogeneity using two approaches, physical adsorption and chemical crosslinking. It is demonstrated that nuclease P 1 could be stable immobilized on the surface of pristine GO by physical adsorption and on the edge of modified GO nanosheets by chemical crosslinking. The resultant loading capacity of nuclease P 1 on pristine GO is as high as 6.45 mg/mg as a consequence of strong electrostatic and hydrophobic interactions between the enzyme and carrier. However, it is determined that the acid resistance, thermal stability, reusability and degradation efficiency of the immobilized enzyme on PEG-NH 2 -modified GO are obviously improved compared to those of the enzyme immobilized on pristine GO. The enhanced catalytic behavior demonstrates that GO and its derivatives have great potential in efficient biocatalytic systems.
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PubMed
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Yanghe Fu,Long Sun,Huan Yang,Lai Xu,Fumin Zhang,Weidong Zhu
The Ni-doped NH 2 -MIL-125(Ti) catalyst was developed for the photocatalytic aerobic oxidation of aromatic alcohols upon visible light irradiation. The results show that different aromatic alcohols can be effectively transformed to their corresponding aldehydes with almost absolute selectivity using O 2 as the oxidant over Ni-doped NH 2 -MIL-125(Ti) upon visible light irradiation. Compared with the parent catalyst NH 2 -MIL-125(Ti), Ni-doped NH 2 -MIL-125(Ti) exhibits a significantly enhanced photocatalytic activity for the selective oxidation of aromatic alcohols. Preliminary studies indicate that the doping of Ni nanoparticles into NH 2 -MIL-125(Ti) could improve the visible-light harvesting, charge-separation, and electron-transport of the resultant catalyst, leading to the enhanced photocatalytic activity. The current work provides some guidance in the development of MOF-based photocatalysts for organic syntheses.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Juan Yang,Lite Yang,Huili Ye,Faqiong Zhao,Baizhao Zeng
In this work, highly dispersed AuPd alloy nanoparticles (NPs, 3–6 nm) decorated amino-functionalized Zr(IV)-based metal–organic framework (i.e. UiO-66-NH 2 ) was prepared via a novel adsorption/reduction method in ethanol-water solution. In this process, the UiO-66-NH 2 acted as both supporting platform and protective agent. The pores of UiO-66-NH 2 could limit the aggregation and migration of AuPd alloy NPs. The resulting AuPd/UiO-66-NH 2 catalyst possessed large specific surface area and excellent stability and dispersity in aqueous media. When it was used to construct a nitrite sensor, the composite material exhibited higher catalytic activity than the metal counterparts (i.e., Au/UiO-66-NH 2 and Pd/UiO-66-NH 2 ) due to the strong metallic synergistic effect. The electrochemical study demonstrated that the AuPd/UiO-66-NH 2 based sensor had an extended linear response concentration range of 0.05–5666 μ M for nitrite detection, with a detection limit of 0.01 μ M. It was successfully applied to determine nitrite in sausage and pickle samples.
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Journal of Physical Chemistry C
·
2013
·
IF 4.814
Yongfeng Liu,Chao Li,Bo Li,Mingxia Gao,Hongge Pan
The hydrogen storage properties and mechanisms of the Mg(NH2)2–2LiH system with potassium halides (KF, KCl, KBr, and KI) were investigated and discussed. The results show that the KF-added sample exhibits superior hydrogen storage properties as ∼5.0 wt % of hydrogen can be reversibly stored in the 0.08KF-added sample via a two-stage reaction with an onset dehydrogenation temperature of 80 °C. However, hydrogen storage behaviors of the samples with KCl, KBr, and KI remain almost unchanged. The fact that KF can readily react with LiH to convert to KH and LiF due to the favorable thermodynamics during ball milling should be the primary reason for its significant effects, as the presence of KH provides a synergetic thermodynamic and kinetic destabilization in the hydrogen storage reaction of the Mg(NH2)2–2LiH system by declining the activation energy of the first-step dehydrogenation as a catalyst and reducing the desorption enthalpy change of the second step as a reactant. The understanding on the role played by KF sheds light on how to further decrease the operating temperature and enhance the hydrogen storage kinetics of the metal–N–H system.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Hai Tao Xing,Jian Hua Chen,Xue Sun,Yi Hong Huang,Zhen Bo Su,Shi Rong Hu,Wen Weng,Shun Xing Li,Hong Xu Guo,Wen Bing Wu,Ya Shan He,Fei Ming Li,Yang Huang
Graphene oxide nanosheets (GO) were dispersed and crosslinked with a water soluble polymer, namely poly(allylamine hydrochloride) (PAH) with high amine density, to prepared a novel PAH-GO composite, which was used for removing Cu(II) ions from aqueous solutions. The physico-chemical properties of PAH-GO composites were investigated by transmission electron microscopy, thermogravimetric analysis, etc. Adsorption experiments indicated that adsorption process was strongly dependent on pH and temperature, however weakly dependent on ionic strength. The maximum adsorption capacity was about 349.03 mg/g higher than that of currently reported. Competitive adsorption studies for the ternary system suggested that the adsorption of PAH-GO composite for Cu(II) ions was much preferable to Cd(II) and Ni(II) ions. Thermodynamic parameters suggested that adsorptions were endothermic and spontaneous processes. The Langmuir adsorption isotherm was applicable fit adsorption process, and adsorption kinetic process could be described by the pseudo-second-order model. Adsorption–desorption results showed that the reusability of PAH-GO composite was encouraging. Based on the results obtained, we conclude that PAH-GO composite can be an effective and potential adsorbent for removing Cu(II) ions from an aqueous solution.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Wei Liu,Ming Yang,Shuang Wang,Yan-Sai Bao,Yong-He Cui,Ling-Xu Meng,Liang-Cheng Li,Yang Wu,Yu-Yang Zhang
Solid-phase microextraction (SPME) has been widely used for the analyzing trace organic pollutants in environmental samples. The properties of coatings have a significant effect on the application range, selectivity and sensitivity of existing analytical methods. Therefore, the development of SPME technology depends on fibers with a stable, efficient, and selective coating. In this study, metal-organic frameworks (MOFs) were used to fabricate porous carbon membranes in situ for SPME. The composite material (UIO66-NH 2 @PAC) was directly carbonized to prepare a derivative porous carbon material (C-UIO66-NH 2 @PAC), which was applied to the extraction of off-odour organic pollutants for the first time. The Zr-N co-doping in the material was not only beneficial to the formation of derivatized porous carbon, but also endowed it with a certain hydrophilicity, which was highly advantageous for capturing weakly polar compounds. By optimizing the extraction and desorption conditions, a highly selective and sensitive analytical method was developed, which exhibited a detection limit of 0.61 and 0.78 ng L −1 for 2-methylisoborneol (2-MIB) and geosmin (GSM), respectively, along with a linear range from 10 to 3000 ng L −1 . Both intra-fiber repeatability (RSD 5.5 % and 3.7 %) and inter-fiber repeatability (RSD 9.7 % and 8.8 %) were satisfactory. The fiber coated with C-UIO66-NH 2 @PAC exhibited high extraction efficiency (the extraction efficiency of the analytes was 4.6–8.3 times higher than that of commercial fibers), and had excellent thermal and chemical stability. Finally, the C-UIO66-NH 2 @PAC-coated fibers were successfully applied to the SPME analysis of off-odour organic pollutants in real water samples, and these results highlighted the broad prospect for the detection of natural/drinking water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hongfei Jia,Yangchen Wang,Lizi Yang,Ran Fang
Lithium metal, a pivotal element in modern electric vehicles and electronics, necessitates secure and sustainable supply chains. Extracting lithium from brines presents significant challenges, particularly when dealing with high magnesium-to-lithium ratios, due to the nearly identical ionic radii of lithium and magnesium ions. Herein, we propose an innovative strategy for the selective separation of Li + /Mg 2+ by integrating ZIF-8-NH 2 into polyamide membranes through the interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC). The synthesized PEI@ZIF-8-NH 2 + TMC membranes exhibit an impressive permeation rate for Li + of 0.863 mol m -2 h -1 , alongside a Li + /Mg 2+ selectivity ratio of 33.06. The unique pore structure of ZIF-8-NH 2 and surface chemistry facilitate efficient Li + /Mg 2+ separation, driven by synergistic interactions such as elevated positive surface charges, subnanometer channels, and strong π-π stacking with polyamide layers. These developments are anticipated to augment both the selectivity and durability of MOF-based membranes, providing new directions for research and practical implementations in ion separation technology.
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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.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Wenfan Yu,Zhenxuan Liang,Shaoyu Luo,Qian Yan,Yi Sun,Yisheng Zhu,Shifeng Zhang
Metal-organic frameworks (MOFs) are highly advantageous due to their tunable pore size, exceptional thermal and chemical stability, and high specific surface area, making them ideal for applications in formaldehyde adsorption. However, the practical use of powdered MOFs is significantly hindered by their recycling challenges. In this research, wood-based composite aerogels (WAZN-X) were successfully prepared through loading Zeolitic Imidazolate Framework-8-NH 2 (ZIF-8-NH 2 ) inside wood aerogels. Ascribing to the elimination of lignin and hemicellulose, the enlarged pore structures of wood aerogels and the potential interactions (e.g., hydrogen bonding and electrostatic attractions) between components promoted the uniformly depositing of ZIF-8-NH 2 nanocrystals. The WAZN-X aerogels displayed excellent mechanical strength (e.g., the longitudinal Young’s modulus of 68.57 MPa) and promising formaldehyde adsorption performance (e.g., a stable formaldehyde removal rate of 98.11 %), and kept commendable reusability (95.98 % after 5 cycles). This research provides a new insight for developing high-value functional composite adsorbents for efficient formaldehyde purification.
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