ANALYST
·
2017
·Vol. 143
·期 2
·409-414
·
IF 3.885
Hong Shao,Yadan Ding,Xia Hong,Yichun Liu
The detection of copper ion (Cu2+) has become a long-term and arduous task in the field of environmental monitoring and human health. Current methods based on branched polyethylenimine (BPEI) for the detection of Cu2+ more or less suffer from being time-consuming and having a high cost or complex surface modifications. Herein, an ultra-facile and rapid colorimetric method was explored to detect Cu2+ in 100% aqueous solution by a direct format using only BPEI. Cu2+ could be captured by BPEI and form BPEI–Cu2+ complexes, which resulted in a color change from colorless to blue within 5 s, associated with the strong absorption peak at 278 nm. The lower the molecular weight and the concentration of BPEI are, the lower the detection limit is. When the molecular weight and the concentration of BPEI were 600 and 21.5 mg L−1, respectively, the detection limit was calculated to be 1.21 μM, and the linear range was 2 μM to 50 μM. Besides, BPEI also had an excellent selectivity toward Cu2+. This ultra-facile, rapid and inexpensive method offers great potential for various applications in biomedicine, environmental protection, food safety and so on.
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PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Pengfei Zhu,Mengrong Geng,Shuang Qin,Heyang Cao,Zhenhong He,Xinhua Gao,Chuanyi Wang
The conversion of CO 2 into chemical products or fuels of great value always remains an outstanding challenge. Here, we report a heterojunction Fe@C/Ni 2 P composite catalyst obtained by preparing MIL-100(Fe) derived Fe@C confined Ni 2 P nanoparticles, which is applied to photothermal catalytic CO 2 hydrogenation with H 2 O. Without adding any sacrificial agents or co-catalysts, the optimal Fe@C/Ni 2 P sample shows higher yields for CO 2 -to-C 2 H 6 and CO 2 -to-CO yield of 5.83 μmol g −1 h −1 and 179.9 μmol g −1 h −1 than that of pristine Fe@C and Ni 2 P, respectively. The experimental results indicated that the obtained Fe@C/Ni 2 P can act as catalytic sites to adsorb, activate, and convert CO 2 under low-intensity LED light irradiation (420 nm) with a temperature of 200 ℃. The physical structure, photochemical properties and energy band structure of the Fe@C/Ni 2 P composite catalysts were investigated by XRD, XPS, FT-IR, TEM, BET, respectively. Furthermore, the reaction pathway of Fe@C/Ni 2 P photothermal catalytic CO 2 hydrogenation with H 2 O to C2 products and CO were systematically analyzed by in situ infrared spectroscopy (DRIFTS).
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 15
·7449-7455
·
IF 5.968
Shu-Hui Huo,Xiu-Ping Yan
The adsorption of malachite green from aqueous solution on a highly porous metal–organic framework MIL-100(Fe) was studied in view of the adsorption isotherm, thermodynamics, kinetics, and regeneration of the sorbent. The adsorption isotherms of malachite green on MIL-100(Fe) followed the Freundlich model, and MIL-100(Fe) possessed heterogeneous surface caused by the presence of different functional groups on the surface. The adsorption of malachite green on MIL-100(Fe) is controlled by an entropy effect rather than an enthalpy change, and obeyed a pseudo-second-order kinetics. Analysis of the intraparticle diffusion plots revealed that more than one process affected the adsorption, and film (boundary layer) diffusion controlled the adsorption rate at the beginning. Evidence from zeta potential and X-ray photoelectron spectroscopic data showed that the adsorption of malachite green was also driven by electrostatic attraction and the interaction between the Lewis base –N(CH3)2 in malachite green and the water molecule coordinated metal sites of MIL-100(Fe). MIL-100(Fe) gave much higher adsorption capacity for malachite green than other conventional adsorbents such as activated carbon and natural zeolite. The high adsorption capacity, good solvent stability, and excellent reusability make MIL-100(Fe) attractive for the removal of MG from aqueous solution.
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JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Shu-Hui Huo,Hai-Yan An,Jing Yu,Xue-Feng Mao,Zhe Zhang,Lei Bai,Yan-Feng Huang,Peng-Xin Zhou
In this study, we report a facile, environmental friendly fabrication of a type of magnetic metal-organic framework (MOF) MIL-100 that can be used for magnetic solid-phase extraction (MSPE). The magnetic MOF composites were fabricated using in situ calcination method. The as-synthesized materials exhibited both high porosity and magnetic characteristics. They used for the MSPE of polycyclic aromatic hydrocarbons (PAHs) from water samples. Such MOF-based magnetic solid-phase extraction in combination with gas chromatography equipped with a flame ionization detector (GC-FID), exhibited wide linearity (0.02–250 μ g L −1 ), low detection limits (4.6-8.9 ng L −1 ), and high enrichment factors (452–907) for PAHs. The relative standard deviations (RSDs) for intra- and inter-day extractions of PAHs were ranging from 1.7% to 9.8% and 3.8% to 9.2%, respectively. The recoveries for spiked PAHs (1 μ g L −1 ) in water samples were in the range of 88.5% to 106.6%. The results showed that the special anion-π orbital (electron donor-acceptor) interaction and π-π stacking between magnetic MIL-100 and PAHs play an important role in the adsorption of PAHs.
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PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Bo Xu,Zhiming Chen,Bing Han,Cuncheng Li
This work presents MIL-100(Fe) nanoparticles synthesized using glycol with uniform size and morphology. This is the first report of nanoscale MOFs material synthesized using glycol. The MIL-100(Fe) particles have been characterized by SEM, TEM, XRD and the results indicate that the MOFs particles show monodispersed nanospherical morphology. Photocatalytic study reveals that the MIL-100(Fe) nanospheres exhibit good oxidation ability of benzene to phenol under visible light irradiation with high selectivity.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yong Fu,Pengyi Zhang,Xianjie Wang
We developed a feasible strategy to obtain the defective MIL-100(Cr) (De-M) via doping 3,5-pyridinedicarboxylate and subsequently loaded polydivinylbenzene (PDVB) by thermal deposition to obtain a hydrophobic MOFs composite (De-M@PDVB). De-M 10 (10 % defective ligand/total ligands) exhibited excellent performance for the capture of toluene due to uniform particle size, high specific surface area and pore volume. Subsequent thermal deposition with PDVB further increased the hydrophobicity, as-obtained De-M 10 @PDVB in the dynamic adsorption experiment showed about 2 and 1.5 time adsorption capacity as that of primary MIL-100(Cr) and De-M 10 under 50 % RH at 298 K. In addition, the toluene uptake of De-M 10 @PDVB (0.95, 298 K) in static adsorption experiments was 1320 mg/g, much higher than many reported MOFs. Furthermore, De-M 10 @PDVB could be regenerated at 378 K, demonstrating its excellent regenerability at low temperature. The adsorption mechanism of toluene on De-M 10 @PDVB could be attribute to the π-π stacking interaction between the benzene ring of toluene with H 3 BTC and adsorption sites offered by the incorporation of H 2 DL in the framework of MIL-100(Cr) according to XPS analysis. Our finding provided a novel strategy by constructing defective MIL-100(Cr) and introducing PDVB to enhance efficient adsorption for toluene capture even in humid air.
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ChemCatChem
·
2024
·
IF 3.8
Chengzhuo Yu,Jin Xu,Yarui Wang,Silong Wang,Li Xiong,Fanglan Geng,Zesen Shang,Huasheng Wu,Jitao Lv,Lixia Zhao,Yawei Wang
Graphical Untill now, reactive oxygen species (ROS) are difficult to generate in the natural light conditions, since most photocatalysts require external strong stimuli. We surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. The ROS generation patterns and mechanism of MIL-100(Fe)/TiO 2 was revealed by chemiluminescence (CL) and density functional theory (DFT). Reactive oxygen species (ROS), as one kind of the most highly oxidizing oxidants, are difficult to generate and utilize in the natural light conditions, since many materials require external strong stimuli for ROS release to be effective as pollutant degradation or biocide. In this work, we surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. Then ROS generation patterns and mechanism was revealed by chemiluminescence (CL) and density functional theory (DFT). Meanwhile, rhodamine B (RhB) can also be removed by MIL-100(Fe)/TiO 2 under natural light, which further evidence the ROS generation under the natural light. This work provides a new direction for spontaneously generating ROS releasing without external strong stimuli and has the broad potential applications in the field of pollutant degradation or antimicrobials under natural conditions.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yuqin Yang,Gui Zhang,Li Song,Guangrong Kuang,Yilan Ding,Shuchun Bu,Yaqin Chai,Yingzi Fu
Carbon dots (CDs) with excellent optical performance have attracted tremendous interest for the construction of electrochemiluminescence (ECL) biosensors. However, the intrinsic self-aggregation behavior of CDs brings a serious issue of aggregation-caused quenching (ACQ), which can quench the ECL emission. In this work, different surfactants (non-ionic, anionic and cationic) were used to modulate the preparation of functionalized CDs (CDs-based nanocomposites). Their ECL performances were significantly enhanced in potassium persulfate solution. In particular, the highest ECL intensity obtained from the Triton X-100 functionalized CDs (T-CDs) was 16.8-fold than that of CDs as ACQ was suppressed effectively. Therefore, utilizing T-CDs as an ECL luminophore, integrating with the catalytic hairpin assembly and strand displacement reaction signal amplification strategies, a "Signal on" ECL biosensor was constructed for microRNA-21 (miRNA-21) monitoring. The proposed biosensor shows a dynamic range from10 fmol·L −1 to 10 nmol·L −1 at a low detection limit of 2.9 fmol·L −1 (S/N = 3). Meanwhile, it exhibits good results for analyzing miRNA-21 in healthy human samples and the expression in MCF-7 and HeLa cells. This work not only expands the method for suppressing ACQ of CDs, but also shows great potential for the analysis of other biomarkers by replacing the corresponding DNA sequences , so as to realize the early diagnosis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Bo Xue,Chuanruo Yang,Pengtao Guo,Ting Wang,Gan Li,Dahuan Liu
The low efficiency of photogenerated carriers separation and slow cycling of Fe 2+ /Fe 3+ in Fe-based metal–organic frameworks (MOFs) have limited the improvement of their photo-Fenton activity. Therefore, in this work, MIL-100/BiOBr heterogeneous photo-Fenton catalyst was constructed by compositing MIL-100 with BiOBr nanosheets through a simple solvent evaporation method. In this system, the type II heterojunctions formed by the close contact of MIL-100 and BiOBr can promote the separation of photogenerated carriers and accelerate the redox cyclic of Fe 2+ /Fe 3+ , thereby significantly enhancing the photo-Fenton activity. Under visible light irradiation for 60 min, the best removal rate of tetracycline hydrochloride (TCH) by MIL-100/BiOBr is 94.3 %. Remarkably, the MIL-100/BiOBr exhibits a nearly fourfold increase in degradation rate constant compared to MIL-100 at photo-Fenton system. In addition, the catalysts can maintain high degradation performance over a wide pH range (3–9) and the co-existence of different anions. An in-depth investigation of the degradation mechanism reveals that superoxide radicals ( · O 2 – ) and hydroxyl radicals (·OH) play major roles in the photo-Fenton system. Based on this, the possible degradation pathways were proposed. Therefore, this study provides a new strategy for Fe-based MOFs to remove emerging pollutants from wastewater by photo-Fenton reaction.
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高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 33
·期 1
·2005074
·
IF 27.398
Yang Li,Chongjia Lin,Zuoxu Wu,Zhongying Chen,Cheng Chi,Feng Cao,Deqing Mei,He Yan,Chi Yan Tso,Christopher Y. H. Chao,Baoling Huang
Low-cost and large-area solar–thermal absorbers with superior spectral selectivity and excellent thermal stability are vital for efficient and large-scale solar–thermal conversion applications, such as space heating, desalination, ice mitigation, photothermal catalysis, and concentrating solar power. Few state-of-the-art selective absorbers are qualified for both low- ( < 200 ° C) and high-temperature ( > 600 ° C) applications due to insufficient spectral selectivity or thermal stability over a wide temperature range. Here, a high-performance plasmonic metamaterial selective absorber is developed by facile solution-based processes via assembling an ultrathin ( ≈ 120 nm) titanium nitride (TiN) nanoparticle film on a TiN mirror. Enabled by the synergetic in-plane plasmon and out-of-plane Fabry–Pérot resonances, the all-ceramic plasmonic metamaterial simultaneously achieves high, full-spectrum solar absorption (95%), low mid-IR emission (3% at 100 ° C), and excellent stability over a temperature range of 100–727 ° C, even outperforming most vacuum-deposited absorbers at their specific operating temperatures. The competitive performance of the solution-processed absorber is accompanied by a significant cost reduction compared with vacuum-deposited absorbers. All these merits render it a cost-effective, universal solution to offering high efficiency (89–93%) for both low- and high-temperature solar–thermal applications.
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Chemistry-Switzerland
·
2025
·Vol. 7
·期 5
·150
·
IF 2.4
Ting Geng,Yuhan Qin,Zhuo Chen,Yuhan Sun,Ao Zhang,Mengyuan Lu,Mengzhen Lu,Siying Zhou,Yongguang Li,Guanjun Xiao
Lead-free perovskite variants have emerged as promising candidates due to their self-trapped exciton emission. However, in ASnX3systems, facile oxidation of Sn(II) to Sn(IV) yields A2SnCl6vacancy-ordered derivatives. Paradoxically, despite possessing a direct bandgap, these variants exhibit diminished photoluminescence (PL). Doping engineering thus becomes essential for precise optical tailoring of A2SnX6materials. Herein, through integrated first-principles calculations and spectroscopic analysis, we elucidate the luminescence mechanism in Te4+-doped (NH4)2SnCl6lead-free perovskites. Density functional theory, X-ray diffraction (XRD) patterns and X-ray photoelectron spectroscopy (XPS) confirm Te4+substitution at Sn sites via favorable chemical potentials. Spectral interrogations, including absorption and emission profiles, reveal that the intense emission originates from the triplet STE recombination (3P1→1S0) of Te centers. Temperature-dependent PL spectra further demonstrate strong electron–phonon coupling that induces symmetry-breaking distortions to stabilize STEs. Complementary electronic band structure and molecular orbital calculations unveil the underlying photophysical pathway. Leveraging these distinct thermal responses of PL intensity and peak position, 0.5%Te:(NH4)2SnCl6emerges as a highly promising candidate for non-contact, dual-parameter optical thermometry over an ultra-broad range (100–400 K). This work provides fundamental insights into the exciton dynamics and thermal engineering of optical properties in this material system, establishing its significant potential for advanced temperature-sensing applications.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Jing Wu,Rong Zhao,Hui Xiang,Chenfan Yang,Wenda Zhong,Chengzhi Zhang,Qin Zhang,Xuanke Li,Nianjun Yang
Tin disulfide (SnS 2 ), one transition metal dichalcogenide (TMD) is a cost-effective and promising electrocatalyst for hydrogen evolution reactions (HER) in the alkaline electrolytes. Its electrocatalytic HER performance is unfortunately limited, originating from its un-conspicuous inherent catalytic activities and non-favorable adsorption sites for hydrogen. Herein, a tin disulfide/stannic oxide (SnS 2 /SnO 2 ) heterostructure is designed and grown on the nickel foam (denoted as SnS 2 /SnO 2 -NF). The SnS 2 /SnO 2 heterostructure introduces more active (100) facets or a high density of active sites, accelerates the diffusion kinetic of electrons and ions, lowers the water dissociation energies, and optimizes adsorption energies of hydrogen atoms. On this catalyst, superior HER performance is realized in an alkaline medium. An overpotential of 108 mV at a current density of −10 mA cm –2 with a Tafel slope of 50.1 mV dec –1 and long-term durability are achieved for HER in 1 M KOH. This work paves a new way to design high-performance HER electrocatalyst through facet engineering of the designed heterostructures.
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高影响因子
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