DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 48
·17737-17744
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IF 4.174
Deyi Zhan,Abdul Saeed,Zixuan Li,Chengming Wang,Zhiwu Yu,Junfeng Wang,Nanjing Zhao,Weihong Xu,Jinhuai Liu
Recently, exploring new luminescent metal–organic frameworks (LMOFs) to selectively detect nitro-aromatic compounds (NACs) has been a hot topic of research. Simultaneously, it is still a challenging issue to understand the sensing mechanism of luminescent MOFs interacting with NACs at the molecular level. In this work, highly fluorescent Sc-tetracarboxylate frameworks (Sc-EBTC) have been successfully synthesized through a solvothermal method. The as-prepared Sc-EBTC crystals have good thermal stability, chemical stability as well as strong fluorescence (λex = 320 nm and λem = 400 nm), and they can detect various NACs rapidly (as short as 30 s), selectively and efficiently by the “turn-off” fluorescence mechanism. The detection limits of Sc-EBTC toward 2,4-DNP and 4-NP are quantified to be 5.71 ppb and 6.26 ppb, respectively. Furthermore, to better understand the sensing mechanism, we attempt to use solid-state NMR and X-ray photoelectron spectroscopy to vividly characterize the charge transfer caused by the interaction between NAC molecules and the MOF at the molecular level. Additionally, test strips were made successfully for the practical detection of the NACs. This study demonstrates that the MOF constructed from the H4EBTC ligands might be a promising candidate for the detection of trace NACs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xiaolong Zhang,Lei Chen,Yang Liu,Yaxin Wang,Qian Duan
We report a facile one-step, co-chemical reduction controlled synthesis of Co x Pt 100-x (x = 25, 35, 50, 65, 75) alloy nanoparticles (NPs). Alloy NPs with Co to Pt atomic ratios of 25/75, 50/50 and 75/25 were found to exhibit a pure phase and superpara-magnetism with a small NP size distribution. The saturation magnetization for Co 75 Pt 25 NPs (55.17 emu/g) was highest than that for Co 25 Pt 75 NPs (47.58 emu/g) and Co 50 Pt 50 NPs (32.38 emu/g), confirmed the best magnetic response of Co 75 Pt 25 NPs. Furthermore, the average crystallite sizes for Co x Pt 100- x (x = 25, 50, 75) alloy NPs is 5.72 nm, 5.43 nm and 5.6 nm, respectively. The observation of an obviously reduced catalytic reduction time and increased rate constant confirmed that the Co x Pt 100- x (x = 25, 50, 75) alloy NPs exhibit intensive performance for the catalytic reduction of 4-nitrophenol (4-NP). Moreover, compared with Co 25 Pt 75 and Co 50 Pt 50 alloy NPs, the Co 75 Pt 25 alloy NPs exhibit short reaction times for catalytic reduction due to their stability in aqueous solution and short induction time. The recycling ability of the alloy catalysts was certified with high yields in four reaction cycles.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Cui Zhang,Jian Lu,Jun Wu
The phytoremediation of phenolic endocrine disrupting compounds (EDCs) in coastal waters by intertidal macroalgae was firstly investigated. The results showed that intertidal macroalgae could remove bisphenol A (BPA) and nonylphenol (NP) at environmental relevant concentration, and Ulva pertusa was the most efficient one. In most cases, the order of EDCs removal efficiency could be expressed as: green algae > brown algae > red algae . The in-situ monitoring using a charge‐coupled device imaging system confirmed the accumulation of EDCs in the intertidal macroalgae. The removal mechanisms included the initial rapid biosorption process, followed by the slow accumulation and biodegradation. The removal efficiency of BPA and NP was slightly dependent on temperature and nutrient concentration. A linear relationship was observed between the initial concentration and the average removal rate (R 2 > 0.99). The BPA and NP at the environmental relevant concentration (100 μg L −1 ) could be removed efficiently using Ulva pertusa even after three cycles in pilot-scale experiments. The high removal efficiency of NP and BPA was also confirmed by the field investigation from the intertidal zone with abundant Ulva pertusa . These findings demonstrated that intertidal macroalgae could play essential role for the phytoremediation of phenolic EDCs in coastal waters.
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高影响因子
Journal of Materials Chemistry C
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2020
·Vol. 8
·期 48
·17202-17210
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IF 7.059
Xin Zhang,Yumei Ran,Qianqian Fu,Jianping Ge
Amorphous photonic crystals (APCs) assembled by mesoporous SiO2 particles were first used to develop thin layer chromatography (TLC) with high separation efficiency and convenient colorimetric recognition. The m-SiO2 APC film has a large number of micron-scale pores, which significantly accelerate the solvent diffusion and address the problem of the short-distance development. Meanwhile, the abundant mesopores in m-SiO2 particles intensify the adsorption–desorption between analytes and APC film. Although the critical micron-scale pores were introduced by the sacrifice of long-range ordered structure, the APC film still has uniform structural colors due to its short-range ordered structure. Therefore, the APC film retains the advantage of colorimetric recognition, where the loaded chemicals cause an increased refractive index and a structural-color change. Compared to traditional SiO2 gel TLC, the sample recognition in APC TLC was simplified because chemical compounds, which must be dyed, can be directly recognized now. Meanwhile, the separation resolution achieved by m-SiO2 APC TLC was also improved due to the enhancement of adsorption–desorption.
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ACS ES&T Engineering
·
2020
·
IF 0
Yuxian Wang,Nuo Ren,Jiaxin Xi,Ya Liu,Tao Kong,Chunmao Chen,Yongbing Xie,Xiaoguang Duan,Shaobin Wang
High-performance and robust catalysts act as core drivers for advanced oxidation technologies for decontamination of water resources. In this study, we used a facile strategy to prepare magnetic and N-doped carbon nanotubes with cobalt encapsulation (Co–N@CNTs) to catalyze ozone for decomposition of aqueous organic pollutants. By regulating the thermal conditions during the synthesis, the derived Co–N@CNTs manifested maneuvered adsorption capabilities. The embedded Co nanoparticles (NPs) not only afforded carbon nanotubes with a magnetic property but also significantly boosted catalytic ozonation due to the synergistic coupling of the Co interface and N-doped graphitic layer. Formation of such a coordinating structure accelerated electron transfer at the interface and increased the conductivity of surface carbon to coordinate a redox reaction. Density functional theory (DFT) calculations and experimental evidence confirmed that cobalt coupled with graphene with pyridinic N dopants was the most favorable structure, which remarkably enhanced ozone adsorption and its dissociation to generate reactive oxygen species (ROS). Intriguingly, the catalytic ozonation underwent different nonradical regimes dependent on the molecular structures of target organics. In terms of ROS, surface-adsorbed atomic oxygen (*Oad) was responsible for degradation of oxalic acid, while phenolics were primarily degraded by O3 molecules and singlet oxygen (1O2). This study provides a cost-efficient and recyclable carbocatalyst for wastewater decontamination and new insights into the structure–functional relationships in carbon-based advanced oxidation processes.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Kishore Chand,Dianxue Cao,Diaa Eldin Fouad,Ahmer Hussain Shah,Muhammad Nazim Lakhan,Abdul Qadeer Dayo,Hemant J. Sagar,Kai Zhu,Abdalla Mohamed Ali Mohamed
In this study, Acacia catechu (AC) extract was used as a stabilizing and reducing agent to synthesize silver (Ag) and titanium dioxide (TiO 2 ) nanoparticles (NPs). By using AC extract, the synthesis process becomes more environmental friendly, economical, and advantageous. The morphology and size of synthesized Ag and TiO 2 NPs were determined by X-ray diffraction (XRD), Transmission electron microscopy (TEM), Dynamic light scattering (DLS), Atomic force microscopy (AFM), and Scanning electron microscopy (SEM). Elemental composition was determined by using Fourier transform infrared spectroscopy (FTIR) and Energy dispersive X-ray spectrometer (EDX), EDS mapping and X-ray photoelectron spectroscopy (XPS). The observations from TEM, SEM, AFM, and DLS revealed that synthesized products are spherical, hexagonal, polydispersed, and ranged within 6–20 nm size. XRD result demonstrated well crystallized and smaller size NPs are formed in both cases. FTIR and XPS analysis depicted the presence of flavonoids , terpenoids , and amino groups in addition to benzene ring agents; which act as stabilizing agents as well as possible aromatic primary amine groups may also be attached with the surface of Ag and TiO 2 NPs. Furthermore, the synthesized AgNPs exhibited strong antibacterial activity against S-aureus and catalytic application over Rose Bengal, Rhodamine B , and 4 nitrophenol dyes as compared to TiO 2 under sunlight (solar irradiation). Overall, Ag and TiO 2 NPs exhibit high potential in the development of antibacterial materials for both Gram-positive as well as Gram-negative bacteria and catalytic material for photocatalytic degradation of a certain type of hazardous dyes or chemicals, thereby paving the way for the treatment and bioremediations. The reason could be high energy and smaller size particles were active in the photo-catalysis and antibacterial performance of AgNPs compared to TiO 2 NPs.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 32
·16392-16404
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IF 11.301
Qiao-Ling Mo,Xin Lin,Zhi-Quan Wei,Xiao-Cheng Dai,Shuo Hou,Tao Li,Fang-Xing Xiao
Precise tuning of photoinduced charge separation and transport has been an enduringly central issue in photocatalysis but has met with limited success. In particular, the controllable, accurate and simultaneous modulation on the charge (electrons/holes) transfer pathway in photocatalytic selective organic transformations has not yet been achieved. Herein, as a proof-of-principle demonstration, we report the fine tuning of charge separation/migration by smartly constructing spatially separated charge transport channels over diverse metal/transition metal chalcogenide [(M/TMC), M = Au, Ag, Pd, TMCs = ZnIn2S4, CdIn2S4, In2S3, and CdS] heterostructure photosystems, which were elaborately crafted by an efficient surface ligand-triggered electrostatic self-assembly. Accordingly, tailor-made positively charged branched poly(ethylene imine) (bPEI)-capped metal nanocrystals (NCs) were controllably and uniformly anchored on the two-dimensional (2D) TMC nanosheet (NS) framework, resulting in well-defined metal/TMC heterostructures. We found that electrons photoexcited over TMC NSs could be spontaneously, smoothly and unidirectionally migrated to closely integrated metal@bPEI NCs, wherein the metal core acts as a Schottky-type electron-trapping reservoir and bPEI ligand as a hole transfer mediator, synergistically affording spatially separated charge transfer channels and expediting the charge separation/transfer efficiency. Benefiting from these merits, the self-assembled M/TMC heterostructures exhibited conspicuously boosted photoactivities in the visible light-driven selective organic transformation toward the anaerobic reduction of aromatic nitro compounds to amino derivatives, which are superior to pristine TMCs and M/TMCs without ligand encapsulation. More significantly, the self-assembly strategy and charge modulation concept are universal for diverse metal NCs and TMCs. Thus, our study provides a general and effective protocol to construct a host of metal/TMC heterostructures and stimulates new inspiration for modulating tunable charge separation/migration for substantial solar energy conversion.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Guifa Xiao,Ying Wang,Hui Zhang,Zhaodong Zhu,Shiyu Fu
Gold nanoparticles (AuNPs) within 10 nm prepared and stabilized by environmentally friendly reducing and supporting agents are highly desired to obtain excellent catalytic properties for organic transformation. In this paper, a rapid and mild strategy for synthesizing ultra-fine AuNPs is reported by using dialdehyde cellulose nanocrystals (DACNCs) as both efficient reductant, dispersant and template for the first time. DACNCs with higher content of aldehyde groups, acting as multi-role player, are crucial to limit the size of AuNPs within 10 nm. Furthermore, AuNPs with average diameter of 5.1 ± 1.0 nm are quantitative obtained at ambient temperature by reducing chloroauric acid within 1 h under conditions of pH= 10.8, 53% aldehyde content, 0.4% DACNCs and 0.25 mM gold ions. In addition, a quantitative method for monitoring the exhaustion of gold ions is established to clarify the synthetic mechanism of AuNPs. Finally, reduction of 4-nitrophenol under AuNPs catalysis is conducted to verify the superiority of as-prepared ultra-fine AuNPs.
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ADVANCED MATERIALS
·
2017
·Vol. 30
·期 6
·1704576
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IF 19.791
Yucheng Luo,Shiyan Fan,Wenqian Yu,Zili Wu,David A. Cullen,Chaolun Liang,Jianying Shi,Chengyong Su
Multifunctional composite materials are currently highly desired for sustainable energy applications. A general strategy to integrate atomically precise Au 25 (SG) 18 with ZIF-8 (Zn(MeIm) 2 , MeIm = 2-methylimidazole), is developed via the typical Zn-carboxylate type of linkage. Au 25 (SG) 18 are uniformly encapsulated into a ZIF-8 framework (Au 25 (SG) 18 @ZIF-8) by coordination-assisted self-assembly. In contrast, Au 25 (SG) 18 integrated by simple impregnation is oriented along the outer surface of ZIF-8 (Au 25 (SG) 18 /ZIF-8). The porous structure and thermal stability of these nanocomposites are characterized by N 2 adsorption–desorption isothermal analysis and thermal gravimetric analysis. The distribution of Au 25 (SG) 18 in the two nanocomposites is confirmed by electron microscopy, and the accessibility of Au 25 (SG) 18 is evaluated by the 4-nitrophenol reduction reaction. The as-prepared nanocomposites retain the high porosity and thermal stability of the ZIF-8 matrix, while also exhibiting the desired catalytic and optical properties derived from the integrated Au 25 (SG) 18 nanoclusters (NCs). Au 25 (SG) 18 @ZIF-8 with isolated Au 25 sites is a promising heterogenous catalyst with size selectivity imparted by the ZIF-8 matrix. The structural distinction between Au 25 (SG) 18 @ZIF-8 and Au 25 (SG) 18 /ZIF-8 determines their different emission features, and provides a new strategy to adjust the optical behavior of Au 25 (SG) 18 for applications in bioimaging and biotherapy.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 23
·9793-9801
·
IF 3.288
Yonghang Xu,Fangya Zhou,Min Chen,Huawen Hu,Limiao Lin,Jingshu Wu,Min Zhang
A novel, efficient and durable ZrP@PDA/Ag nanocatalyst was prepared via the facile reduction and deposition of silver nanoparticles (AgNPs) on two dimensional (2D) α-zirconium phosphate (ZrP) nanosheets using bio-inspired dopamine chemistry. The formation, adhesion and dispersion of AgNPs were confirmed by the full morphological and structural characterizations including SEM, TEM, FTIR, TGA, WXRD, and XPS. This ZrP@PDA/Ag nanocatalyst was evaluated by the reduction of 4-nitrophenol into 4-aminophenol, utilizing UV-vis absorption spectroscopy to monitor the reaction solution with a trace silver content of 0.125 μg mL−1. ZrP@PDA/Ag exhibits a superior catalytic activity compared with other noble metal nanocatalysts due to its high turnover frequency of 32.36 min−1 at room temperature without stirring, which is as high as almost 10 times that of the reported nanocatalysts using 2D graphene and silica supports. Furthermore, due to the excellent catalytic recyclability of ZrP@PDA/Ag it has very promising prospects in the treatment of organic pollutants in water.
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Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 9
·1762-1768
·
IF 0.581
Ce Su,Bai Lingling,Zhang Hongbo,Chang Kaishan,Li Guanbin,Li Siliang
Abstract In this work, the Pt NPs/Fe 3 O 4 -DIB-DETA-CNSs nanohybrids have been synthesized through in situ deposition of uniform Pt and Fe 3 O 4 NPs on the surface of carbon nanospheres. The resulting nanohybrids exhibit good catalytic performance and stability in the reduction of 4-nitrophenol in aqueous solution. Meanwhile, they can be easily separated through an external magnet, and their catalytic properties were also viable even after ten cycles. The unusual catalytic activity should be ascribed to the effects of the Pt NPs anchored on carbon nanospheres.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiuling Ji,Xiaotian Yuan,Hongjuan Nian,Pengfei Song,Yingying Xiang,Yunlin Wei,Suping Wang,Kunhao Qin,Qi Zhang,Yujiao Tu
Novel blue fluorescent carbon dots (CDs- CP ) deriving from yeast Cryptococcus podzolicus 5–2 were successfully prepared via a facile and green hydrothermal synthesis method. It exhibited uniform particle size and possessed good excitation-dependent characteristic. The dead bacterial cells were selectively labled by the CDs- CP , but the live ones not, indicating good potential for the live/dead bacterial differentiation. It was found that the prepared CDs- CP showed low biotoxicity and excellent biocompatibility with multicolour fluorescence emission properties, which provided a new insight on the bioimaging application. In addition, the prepared CDs- CP exhibits high selectivity and sensitivity in Ag(I), 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP) detection with excellent linear ranges of 0–15 μM (R 2 = 0.9945), 0–30 μM (R 2 = 0.9959) and 0–37.5 μM (R 2 = 0.9982), respectively. The low detection limits of Ag(I), 2,4-DNP and 4-NP were 113.57 nM, 73.36 nM and 86.47 nM, respectively. It revealed that static quenching mechanism dominated in Ag(I) quenching of the CDs- CP fluorescent, while those of 2,4-DNP and 4-NP were inner filter effect. The fluorescent CDs- CP was successfully applied to determine the Ag(I), 2,4-DNP and 4-NP in real water samples with satisfactory results. Therefore, it is a good candidate for bioimaging application and environmental pollutant detection.
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