SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Basem E. Keshta,Haojie Yu,Li Wang,Ali H. Gemeay
MIL-101(Cr) MOF (MIL-Materials of Institute Lavoisier; Metal-organic framework) as an adsorbent has great application in water treatment because of its high stability against air, temperature, and chemicals. Herein, we develop a novel value-added, sustainable, and eco-friendly green method to prepare MIL-101(Cr) hydrothermally based on organic and inorganic waste recycling (G-MIL-101(Cr)@R) without hydrofluoric acid (HF) addition. Several characterization techniques suggest that G-MIL-101(Cr)@R was successfully synthesized. Then, it was used as an adsorbent for acid blue 92 dye (AB-92) as a model of anionic dyes. The adsorption parameters were studied, such as adsorbent dose, contact time, pH, dye concentration, temperature, salinity, and dye selectivity. The results showed that the adsorption of AB-92 is a monolayer according to the Langmuir isotherm with a q max of 2176 mg/g. Adsorption kinetics follow the pseudo second-order model (R 2 = 0.99), occurring in three steps according to the intra-particle diffusion kinetic model. The adsorption of AB-92 over G-MIL-101(Cr)@R is spontaneous and exothermic. The adsorption mechanism is mainly defined by electrostatic interactions. G-MIL-101(Cr)@R can adsorb the anionic dyes more efficiently than cationic dyes. It could also be reused for up to five cycles with an uptake efficiency of not less than 80 % without any change in its structure. Finally, G-MIL-101(Cr)@R is considered a superior adsorbent for anionic dyes. So, it will pave the way for developing MIL-101(Cr), based on organic and inorganic waste recycling, as an efficient adsorbent for removing organic dyes from wastewater.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
·
IF 10.9
Huan Yao,Ruifeng Zhang,Yu Wen,Yue Liu,Gang Yu,Zhi-Hui Xie
Metal-organic framework [MOF, i.e., NH 2 -MIL-53(Al)] modified TiO 2 (NMT) composite photoanodes were successfully prepared by hydrothermal synthesis and were used for the photoelectrochemical cathodic protection (PECCP) of nickel-plated magnesium alloy (Mg/Ni). Results showed that the synthesis temperature significantly impacted the morphology and PECCP performance of the NMT photoanodes. The NMT@150 photoanode prepared at a reaction temperature of 150 °C exhibited the best PECCP performance and produced a current density of 1980 μA cm −2 under visible light irradiation, which was 19.8 times higher than that of a single TiO 2 photoanode. The composite photoanode could polarize the open circuit potential of the coupled Mg/Ni electrode to -876 mV and remain relatively stable within 35 h. XPS and EPR tests showed that a Z -scheme heterojunction was formed between the NH 2 -MIL-53(Al) and TiO 2 nanotubes, allowing the photogenerated electrons to accumulate mainly on the conduction band of NH 2 -MIL-53(Al). The heterojunction greatly promoted the separation and transfer of photogenerated electron-hole in the NMT composite photoanode, significantly enhancing the PECCP performance for Mg/Ni.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xin Zhou,Qianwei Liang,Boqian Yang,Yuyu Chen,Yuanyuan Fang,Hanjin Luo,Yushan Liu
Compounding a single component with a specific function into a composite material that can fully exert synergy effects according to demand is the key to achieving the expected function and expanding emerging applications. Herein, anchoring δ -MnO 2 with strong oxidizing ability on the surface of Fe/Mg-MIL-88B with superior uptake ability for As(V) to form an amorphous nanocomposite with multiple functions for removing more toxic As(III). Due to special construction and rational design, the fabricated nanocomposite demonstrated an excellent As(III) removal performance over a very broad pH range of 3 to 10. Impressively, the adsorption efficiency of the obtained δ -MnO 2 @Fe/Mg-MIL-88B on As(III) is greatly improved, and the maximum adsorption capacity under laboratory conditions is as high as 221.04 mg/g in room temperature. Notably, the residual concentration of arsenic will drop below 10 μg/L, as long as the initial As(III) concentration is not higher than10 mg/L, which is very critical for further promotion. In general, the δ -MnO 2 @Fe/Mg-MIL-88B exhibits excellent promise in removing As(III) from sewage, and its applicability in practical complex water treatment deserves further study.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-9
·
IF 6.232
Qin Peige,Zhu Wenli,Han Lizhen,Zhang Xiaowan,Zhao Bing,Zhang Xuebin,Lu Minghua
The monodispersed mesoporous SiO 2 @metal-organic framework (MSN@MIL-101(Fe)) composites were prepared by grafting MSN-NH 2 onto MIL-101(Fe) particles with a solvothermal method. The adsorption ability of the composites was greatly improved compared to that of pristine MSNs or MIL-101(Fe) for phytohormones (Phys). The MSN@MIL-101(Fe) composites were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive spectrometer, and mapping analysis. Using MSN@MIL-101(Fe) composites as sorbent, a dispersive solid-phase extraction procedure (dSPE) was developed to extract three endogenous Phys (abscisic acid (ABA), indole-3-aceticacid (IAA), and indole-3-butyric acid (IBA)) and two exogenous Phys (1-naphthylacetic acid (1-NAA) and 2-naphthylacetic acid (2-NAA)) prior to HPLC-DAD analysis. The experimental parameters including sample volume, sorbent amount, adsorption time, adsorption pH, desorption time, and desorption solvent on extraction efficiency were optimized and evaluated. Under optimized conditions, the working range of 0.08 to 0.45 ng mL −1 with enrichment factors from 144 to 207 were achieved. The linear range is 0.75–200 ng mL −1 for IAA, 0.20–200 ng mL −1 for ABA, and 1.0–200 ng mL −1 for IBA, 1-NAA, and 2-NAA. With MSN@MIL-101(Fe) as sorbent for extraction of Phys and determination by HPLC-DAD, two endogenous Phys (IAA and ABA) were detected from mung bean sprouts which were made in a laboratory, and the results were further confirmed by high-resolution mass spectrometry. The composites can be applied to extract other small molecules, which have similar chemical structures with Phys in biological, environmental, and food samples.
Schematic presentation of a dispersive solid-phase extraction using monodispersed mesoporous SiO 2 @metal-organic framework composites (MSNs@MIL-101(Fe)) as the sorbent for extraction, clean-up, and preconcentration of phytohormones in mung bean sprouts prior to HPLC-DAD analysis.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Liangyan Shao,Zongxue Yu,Xiuhui Li,Xuyang Li,Haojie Zeng,Xiaofang Feng
A one-pot strategy for the preparation of NH 2 -MIL-88B(Fe)/CDs composite was successfully developed via a simple solvothermal synthesis method. NH 2 -MIL-88B(Fe)/CDs composites were characterized by XRD, FT-IR, SEM, TEM, XPS, UV–vis DRS, PL, transient photocurrent response and Mott-Schottky plots. The synthesized NH 2 -MIL-88B(Fe)/CDs composites exhibit stronger photocatalytic activity than the original NH 2 -MIL-88B(Fe) in both photoreduction of Cr(VI) and photodegradation of MB. This is mainly because on the one hand, there is an interaction at the interface between CDs and NH 2 -MIL-88B(Fe), and on the other hand, CDs in the composite as local electron acceptors can effectively enhance charge transfer and inhibit electron-hole recombination. The experimental results show that the pH value greatly affects the reduction efficiency of Cr(VI) over photocatalyst, and the addition of hole trapping agent is beneficial to photocatalytic reduction. Moreover, we have proposed the possible photocatalytic mechanism on composites through trapping experiments of active species. Importantly, cycling experiments have also revealed that NH 2 -MIL-88B(Fe)/CDs photocatalysts have good chemical stability and reusability, and have broad industrial application prospects.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Yana Liu,Cheng Zhang,Hui Liu,Yuebin Li,Zushun Xu,Ling Li,Andrew Whittaker
Rare-earth doped up-conversion nanoparticles (UCNPs) with high uniformity and dispersibility were synthesized by a facile solvothermal method. The conditions of synthesis for NaYF 4 :Yb/Tm were explored, and the NaYF 4 :Yb/Tm particles with the optimal size (about 300 nm) were obtained. Blue emission was observed with the excitation 980 nm near infrared (NIR) laser, indicating that the UCNPs can be potentially used for up-conversion luminescence (UCL) imaging. On basis of the optimal UCNPs, further coated by poly (ethylene glycol) (PEG) functionalized metal-organic frameworks (MOFs), a multifunctional platform UCNPs@MIL-PEG for cancer diagnosis and treatment was established. The core-shell structure was confirmed by TEM images. Doxorubicin (DOX) was selected as drug model and the drug loading of UCNPs@MIL-PEG was found to be 60%. Cytotoxicity indicated that UCNPs@MIL-PEG were highly biocompatible. The DOX release in different pH value revealed an excellent pH-triggered drug release. In addition, the UCNPs@MIL-PEG nanoparticles can be tracked by magnetic resonance imaging (MRI). A clear dose-dependent contrast enhancement in T 2 -weighted MR images indicated the potential act as T 2 MRI contrast agents. The UCNPs@MIL-PEG nanoparticles are expected to be simultaneously used for UCL/MR dual-mode imaging and pH-responsive drug release.
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Nano Research
·
2015
·Vol. 8
·期 10
·3237-3249
·
IF 7.01
Liang Ruowen,Jing Fenfen,Shen Lijuan,Qin Na,Wu Ling
Proper design and preparation of high-performance and stable dual functional photocatalytic materials remains a significant objective of research. In this work, highly dispersed noble-metal nanoparticles (Au, Pd, Pt) were immobilized on MIL-100(Fe) (denoted M@MIL-100(Fe)) using a facile room-temperature photodeposition technique. The resulting M@MIL-100(Fe) (M = Au, Pd, and Pt) nanocomposites exhibited enhanced photoactivities toward photocatalytic degradation of methyl orange (MO) and reduction of heavy-metal Cr(VI) ions under visible-light irradiation (λ ≥ 420 nm) compared with blank-MIL-100(Fe). Combining these results with photoelectrochemical analyses revealed that noble-metal deposition can effectively improve the charge-separation efficiency of MIL-100(Fe) under visible-light irradiation. This phenomenon in turn leads to the enhancement of visible-light-driven photoactivity of M@MIL-100(Fe) toward photocatalytic redox reactions. In particular, the Pt@MIL-100(Fe) with an average Pt particle size of 2 nm exhibited remarkably enhanced photoactivities compared with those of M@MIL-100(Fe) (M = Au and Pd), which can be attributed to the integrative effect of the enhanced light absorption intensity and more efficient separation of the photogenerated charge carrier. In addition, possible photocatalytic reaction mechanisms are also proposed.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Fenfen Jing,Ruowen Liang,Jinhua Xiong,Rui Chen,Shiying Zhang,Yanhua Li,Ling Wu
A highly effective Iron Metal-Framework photocatalyst (MIL-68(Fe)) has been successfully prepared via a facile solvothermal method under acidic condition. The UV–vis diffuse reflectance spectrum reveals that the absorption edge of MIL-68(Fe) is 440 nm. The flat-band potential of MIL-68(Fe) is −0.6 V vs. NHE at pH = 6.8, which is more negative than the redox potential of Cr(VI)/Cr(III) (+0.51 V, pH = 6.8). Consequently, it is thermodynamically permissible for the transformation of photogenerated electrons to the Cr(VI) to produce Cr(III). Moreover, MIL-68(Fe) could perform as an efficient photocatalyst towards the reduction of Cr(VI) aqueous with a wide pH range. After 5 min of visible light illumination (λ > 420 nm), almost 100% Cr(VI) can convert to Cr(III) with (NH 4 ) 2 C 2 O 4 as a scavenger (pH = 3), which is also higher than that of N-doped TiO 2 (50%) and ZnO (7.6%) under identical conditions. Furthermore, MIL-68(Fe) is proved to perform as a highly efficient photocatalyst for remove of different aqueous contaminant with malachite green (MG) as a scavenger. Finally, a possible reaction mechanism has also been investigated in detail.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Basem E. Keshta,Haojie Yu,Li Wang,Md Alim Uddin,Heba G. El-Attar,Amr E. Keshta,Ali H. Gemeay,Fathy Hassan,Sherif M. Eid
Fabricating an ion-to-electron transducer (IET) from waste in the solid contact screen-printed ion-selective electrodes (SC-SP-ISEs) technique is challenging because its properties determine the potential stability and reproducibility of the designed sensors. Herein, we fabricated an IET substrate from recyclable wastes, and we applied it as an IET layer in an ISE-based sensor for fast and on-site detection of lead ions (Pb 2+ ) in an environmental sample. First, MIL-101(Cr) was prepared based on a combination of PET and Cr +6 waste recycling (R-MIL-101(Cr)). Polyaniline (PANI) was polymerized over R-MIL-101(Cr) to prepare a conductive PANI@R-MIL-101(Cr) composite. Then, it was applied as an IET substrate in the construction of pb 2+ -ISE for the detection of Pb 2+ ions in sediment samples collected from Lake Idku, Egypt. Three Pb 2+ sensors were fabricated and abbreviated as sensors I, II, and III corresponded to PANI, R-MIL-101(Cr), and PANI@R-MIL-101(Cr) as IET substrates, respectively. The performance of the sensors was studied to be applied for fast and selective detection of Pb 2+ at low concentration levels. Among the fabricated sensors, PANI@R-MIL-101(Cr) shows fast response (5 sec), low detection limit (1 × 10 −7 mol/L), and long lifetime reaches 70 days with a potential drift of 0.9 mV h −1 . The electrochemical characteristics prove the fast ion-to-electron transportation in the case of PANI@R-MIL-101(Cr) owing to its lower impedance and high capacitance. In-situ polymerization of PANI significantly enhanced the conductivity of the PANI@R-MIL-101(Cr) composite. The hydrophobic nature of PANI@R-MIL-101(Cr) ensures high stability by preventing the formation of water layers at the electrode/membrane interface. These results show the great potential of the IET-based PANI@R-MIL-101(Cr) layer for Pb2 + sensing in environmental samples with low detection limits and high stability for the future development of SC-ISEs.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Lili Yuan,Yongkang Yan,Yiyue Tang,Xueer Huang,Jiajing Liao,Jianmei Zou,Jinfang Nie,Lang Zhang,Shan Liao,Yun Zhang
This study initially reports a distance-based quantitative assay of pyrophosphate ion (PPi) based on analyte-triggered decomposition of metal–organic framework (MOF) in microfluidic paper-based analytical devices (µPADs). The µPADs were created using a mini-cutter machine and a home-use hot-pressing machine for loading one type of MOF of NH 2 -MIL-88 (Fe) prepared with Fe 3+ and fluorescent ligand of 2-aminoterephthalic acid (NH 2 -BDC). Upon sample introduction, the PPi could compete with NH 2 -BDC to bind Fe 3+ , leading to disintegration of the MOF and releasing of the fluorescent ligand in paper channel. The length (distance) of the NH 2 -BDC’s flow trace, when irradiated by a money tester pen, is proportional to the PPi level. The results show that the developed method only requires a ruler to linearly quantify PPi in a concentration range of 0–1000 μM, with a limit estimated to be ∼0.25 μM. Furthermore, recovery of PPi in orange juice and human urine was between 95.72 and 108.11 %, further validating its high detection accuracy. The fabrication method for µPADs offers many attractive advantages kike simplicity, batch production capability and low cost. Moreover, to our knowledge, this may be the first report of a portable quantitative MOF-based PPi assay with distance-based readout in µPADs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuang Liu,Mengjie Sheng,Bingqing Quan,Yabi Yang,Qinghong Ji,Xinpeng Hu,Xiang Lu,Jinping Qu
It is certainly one of the most feasible ways to extract fresh water from seawater in the face of the current depletion of fresh water resources. Although solar energy as a heat source for desalination is the cleanest and most abundant way, its intermittent and seasonal also poses an obstacle to its practical application. In order to solve the above-mentioned issues, we prepared a series of phase change composites (PCCs) with excellent light-absorbing and magnetic properties by growing MIL-101(Fe) in situ on cotton fabric. All-day desalination through the synergistic action of phase change material (PCM) and magnetic particles. The evaporation rate of PCC can reach 2.76 kg m −2 h −1 with an evaporation efficiency of 90.19 % under one sunlight condition. The evaporation rate of sea water under the synergistic effect of magnetic particles and PCM reached 4.53 kg m −2 h −1 in the absence of sunlight. This paper provides a new approach to all-day desalination without contact heating.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
·
IF 4.1
Jingjing Chen,Zhixiang Li,Xiaoqi Li,Yingxiang Du
A fluorescence sensor was developed based on NH 2 -MIL-101(Fe) and silicon-doped carbon quantum dots for the analysis of copper ions. Copper ions enhanced the fluorescence intensity of doped silicon-carbon quantum dots and decreased the intensity of NH 2 -MIL-101(Fe). The addition of copper ions resulted in fluorescence resonance energy transfer, which caused a reverse change in the fluorescence signal. The sensor based on the above mechanism can eliminate false positive interference. The fluorescence sensing system had a remarkable linear range of 0.25–5 µM for copper ions and a detection limit of 11 nM. It was then applied to water samples, resulting in recoveries ranging from 95.43 % to 103.1 %. The successful construction of this optical sensor not only broadened the way to detect copper ions but also provided a new idea for the detection of other targets mediated by copper ions. Finally, an attempt was made to construct a smartphone-assisted colourimetric platforms to detect copper ions in daylight.
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危险品化学品经营许可证（带存储）