COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Ran Wang,Chong Cai,Di Wang,Zhiwei Liu,Lili Gao,Tifeng Jiao
In this work, a new type of self-assembled phytic acid-graphene oxide composite foam (PAGF) was prepared by hydrothermal method. In addition, Au nanoparticles (Au NPs) and Fe 3 O 4 particles were loaded onto PADF to obtain PAGF@Au&Fe 3 O 4 composite by a simple one-step method. The addition of graphene oxide (GO) can effectively prevent the agglomeration of Au NPs and weaken its surface passivation. The results of SEM, XRD, XPS and BET proved the successful preparation of the composite and its large specific surface area. Moreover, the synthesized PAGF@Au&Fe 3 O 4 composite showed good catalytic performance for p-nitrophenol (4-NP) and o-nitroaniline (2-NA) solutions with the rate constant (k) values of 0.0799 min −1 and 0.0546 min −1 , respectively. Due to the addition of Fe 3 O 4 , the composite exhibited good stability and recyclability, and maintained high catalytic efficiency after 8 cycles of catalytic process. The current work provides new ideas for developing novel graphene oxide-based composite materials and their catalytic degradation of organic pollutants.
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Journal of Analytical Methods in Chemistry
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2021
·
IF 2.193
Guanjun Nan,Lina Zhang,Zhengzheng Liu,Yu Liu,Yan Du,Hongwen Zhao,Hongxia Zheng,Rong Lin,Guangde Yang,Shaohua Zheng
Eupatorium fortunei Turcz. is a widely used Chinese herbal medicine in China. In this study, a gas chromatography-triple quadrupole mass spectrometry (GC-MS/MS) method was developed and validated to simultaneously determine the contents of p-cymene, thymol, neryl acetate, and β-caryophyllene in roots, stems, and leaves of Eupatorium fortunei Turcz. harvested at different growth periods. All four constituents could be detected in leaves, three could be detected in stems except β-caryophyllene, and only thymol could be detected in roots. The order of the total contents of four constituents in different parts was leaves > stems > roots. It indicated that the leaves could be the proper medicinal parts of Eupatorium fortunei Turcz. The content of four constituents in leaves varied a lot among different growth periods and showed an M-shaped change trend with the growth of Eupatorium fortunei Turcz. The four constituents accumulated to the highest values in early July followed by mid-September. Accordingly, the best harvest time of Eupatorium fortunei Turcz. is early July and mid-September.
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PubMed
高影响因子
ANALYST
·
2021
·Vol. 146
·期 14
·4566-4575
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IF 4.616
Feng Li,Qi-Le Li,Lei Hu,Hong-Yu Zhu,Wen-Juan Wang,Fen-Ying Kong,Heng-Ye Li,Zhong-Xia Wang,Wei Wang
p-Nitrophenol and its derivatives can cause serious harm to the health of mankind and the earth's ecosystem. Therefore, it is necessary to develop a novel and rapid detection technology for p-nitrophenol and its derivative. Herein, excellent water-soluble, large-size and dual-emissive neuron cell-analogous carbon-based probes (NCNPs) have been prepared via a solvothermal approach, using o-phenylenediamine as the only precursor, which exhibit two distinctive fluorescence (FL) peaks at 420 and 555 nm under 345 nm excitation. The NCNPs show a neuron cell-like branched structure, are cross-connected, and are in the range of 10–20 nm in skeleton diameter. Interestingly, their blue-green dual-colour fluorescence is quenched by p-nitrophenol or its derivative due to the specific mechanism of the π⋯π stacking interactions or internal filtration effect. Accordingly, a simple, rapid, direct and free-label ratiometric FL detection of p-nitrophenol is proposed. An excellent linear relationship shows linear regions over the range of 0.1–50 μM between the ratio of the FL intensity (FL555 nm/FL420 nm) and the concentrations of p-nitrophenol. The detection limit is as low as 43 nM (3σ). Importantly, the NCNP-based probe also shows acceptable repeatability and reproducibility for the detection of p-nitrophenol and its derivatives, and the recovery results for p-nitrophenol in real wastewater samples are favourable.
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Arabian Journal of Chemistry
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2020
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IF 4.762
Yue Li,Yuxuan Ma,Yuanyuan Zhang,Xiaojing Wang,Fenghua Bai
The selectivity and reactivity to converse series nitroaromatic into aminobenzenes are especially significant, which play a vital role in synthesizing required drugs or other fine chemicals. Herein, p-nitrophenol (p-NP) has been completely conversed into p-anomiphenol (p-AP) with a high activity factor k (0.033 s −1 ·mg −1 ) and reusability by core-shell Cu 2 O@CeO 2 catalyst. N-acetyl-para-aminophenol (paracetamal, APAP) as a model drug was further synthesized via a flow route proceeded in two steps including p-NP reduction and subsequently p-AP acylation with self-constructing device. The yield of the paracetamal is up to 85% with a highly purity. The mechanism investigation justifies the rich-electron centers and cation defects generated from the redox coupled Cu + →Cu 0 with Ce 3+ →Ce 4+ will steer selective conversion of p-NP to p-AP, a rate-determining step in the production of APAP. The present results could visualize a highly selective catalyst and a new synthesis route for pharmaceuticals such as paracetamal by using nitroaromatic compounds as the raw materials with environment-friendly, low-cost, easy-manipulation, high-efficiency and high purity.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
·
IF 2.888
Midong Shi,Wei Zeng,Shixian Song,Meiting Zhou,Wei Wang
Liquid-liquid equilibrium (LLE) data for {n-heptane + p-xylene (PX) + furfural/dimethyl sulfoxide (DMSO)} ternary systems were measured at 303.15 K and 323.15 K and atmospheric pressure. Extraction performance of furfural and DMSO were evaluated using distribution coefficient (D) and selectivity (S) according to the measured tie-line data. And the results showed that DMSO had better extraction performance than furfural for separation of n-heptane and PX. Both UNIQUAC and NRTL models were used to correlate the experimental LLE data, and relevant interaction parameters were obtained. Consistency between the measured LLE data and the calculated by these two models was well evaluated by RMSD and maximum absolute deviation. Moreover, reliability of binary interaction parameters was confirmed by topological analysis related to the Gibbs tangent plane test.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Mingliang Ma,Yuying Yang,Wenting Li,Yong Ma,Zhouyu Tong,Weibo Huang,Liu Chen,Guanglei Wu,Huanli Wang,Ping Lyu
Yolk-shell magnetic Fe 3 O 4 /P(MAA-MBAA)-PPy/Au/void/TiO 2 microspheres have been prepared as visible light active photocatalyst . In this structure, the Fe 3 O 4 /P(MAA-MBAA)-PPy core-shell support provides magnetic properties for the catalyst and a large number of binding sites for the Au nanoparticles . In addition, coupling TiO 2 with Au nanoparticles can extend the range of absorbable sunlight and enhance electron hole separation. The test of degrading rhodamine B (RhB) under simulated visible light was used to verify the photocatalytic activity of the photocatalyst. The results showed that the photocatalyst exhibited favorable catalytic properties within 90 min in the case of using 4 mg itself. The improved performances were ascribed to the unique yolk-shell structure, which on the one hand greatly improves the light utilization, on the other hand favors full contact of the dye because of the porous appearance of the outer shell. Furthermore, the existence of magnetic core was beneficial to the recycling of the photocatalyst. And the recycling results demonstrated that the catalyst efficiency was maintained at 70.2% even after six recycling experiments. This work not only displays a new material for the degradation of organic dyes, but also provides a new approach for the synthesis of yolk-shell structure photocatalysts.
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Energy Technology
·
2018
·Vol. 7
·期 5
·1800757
·
IF 3.175
Shuolin Li,Hongmei Li,Shaowei Huang,Qian He,Linxi Hou
Tailoring cobalt phosphide electrocatalysts with a tunable phase and morphology is of great importance for the advancement of hydrogen evolution reaction (HER). The synthesis of phase- and morphology-modulated hollow cobalt phosphide nanoparticles coupled with N, P, S co-doped carbon (Co-P@NPS-C) polyhedrons through a facile three-step method is reported. Benefiting from the cooperation of structural features, heteroatoms doping, and catalytic components (Co x P, a mixture of CoP and Co 2 P), the hollow Co x P@NPS-C polyhedrons exhibit superior HER performance and long-term stability in 1.0 m KOH solution, with a low onset potential value (18 mV), an overpotential of 80 mV at 10 mA cm −2 , and a small Tafel slope of 57.6 mV dec −1 . In addition, the Co x P@NPS-C electrodes exhibit good electrochemical properties and stability in 0.5 m H 2 SO 4 solution. These results suggest a novel and promising coating approach with poly(cyclotriphosphazene- co -4,4′-sulfonyldiphenol (PZS) to fabricate other heterogeneous catalysts for various applications.
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JOURNAL OF CRYSTAL GROWTH
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2013
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IF 1.552
Y.F. Zhang,L. Huang,Y.B. Sun,B. Han,H.S. Cheng
In this work, we reported on the synthesis and characterization of (Z)-4-oxo-4-ureido-but-2-enoic acid and p-toluenesulfonic acid 3-nitrophenyl ester and their detailed crystal structure information were studied. The crystallization of (Z)-4-oxo-4-ureido-but-2-enoic acid results in reduced π -conjugation in the molecule and weaker intra-molecular hydrogen bonding. The main driving force for the molecular self-assembly of (Z)-4-oxo-4-ureido-but-2-enoic acid was found to be the strong intermolecular hydrogen bonds . Compared with (Z)-4-oxo-4-ureido-but-2-enoic acid with six type of strong H-bonds, p-toluenesulfonic acid 3-nitrophenyl ester possesses much lower melting point (110–111°C), average packing energy (−3.7 kcal mol −1 ), molecular deformation energy (−0.6 kcal mol −1 ) and highest torsional angle change (9.3°). This can be ascribed to the week intermolecular interaction between center molecule and adjacent molecules.
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NEW JOURNAL OF CHEMISTRY
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2016
·Vol. 40
·期 3
·2315-2320
·
IF 3.277
Li-Ping Mei,Rui Wang,Pei Song,Jiu-Ju Feng,Zhi-Gang Wang,Jian-Rong Chen,Ai-Jun Wang
Well-defined bimetallic yolk–shell nanostructures of Ni@PtNi nanocrystals with porous shells were uniformly deposited on reduced graphene oxide (Ni@PtNi NCs-rGO) under hydrothermal conditions. The physical characterization was systematically investigated by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The as-fabricated products exhibited improved catalytic performance toward the reduction of p-nitrophenol in comparison with commercial Pt/C (50 wt%), monometallic Pt nanoparticles/rGO and Ni nanoparticles/rGO catalysts.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Hui Zhang,Mengya Li,Jie Li,Guangli Wang,Feng Li,Dayong Xu,Yuan Liu,Minghua Xiong
A natural consortium, named L1, of Rhodococcus sp. JT-3 and Brevundimonas sp. JT-9 was obtained from quizalofop- p -ethyl (QE) polluted soil. The consortium was able to use QE as a sole carbon source for growth and degraded 100 mg L −1 of QE in 60 h. Strain JT-3 initiated the catabolism of QE to quizalofop acid (QA), which was used by strain JT-9 as carbon source for growth and to simultaneously feed strain JT-3. A novel esterase EstS-JT, which was responsible for the transformation of QE to QA and essential for the mineralization of QE by the consortium, was cloned from strain JT-3. EstS-JT showed low amino acid identity to other reported esterases from esterase family VIII and represents a new member of this family. The deduced amino acid sequence contained the esterase family VIII conserved motifs S-X-X-K, YSV and WAG. The purified recombinant EstS-JT displayed maximal esterase activity at 35 °C and pH 7.5. An inhibitor assay, site-directed mutagenesis and 3D modeling analysis revealed that S 64 , K 67 and Y 175 were essential for catalysis and probably comprised the catalytic center of EstS-JT. Additionally, EstS-JT had broad substrate specificity and was capable of hydrolyzing p -nitrophenyl esters (C 2 -C 8 ) and various AOPP herbicides.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Wen-Yuan Yan,Qi Zhou,Xing Chen,Yong Yang,Yong Zhang,Xing-Jiu Huang,Yu-Cheng Wu
Photocatalytic degradation is one of the most promising methods for removal of fulvic acids (FA), which is a typical category of natural organic contamination in groundwater. In this paper, TiO 2 /graphene nanocomposites (N-RGO/TiO 2 ) were prepared via simple chemical functionalization and one-step hydrothermal method for efficient photodegradation of FA under illumination of a xenon lamp as light source. Here, p -phenylenediamine was used as not only the linkage chemical agent between TiO 2 nanocrystals and graphene, but also the nitrogen dopant for TiO 2 nanocrystals and graphene. During the hydrothermal process, facets of TiO 2 nanocrystals were modulated with addition of HF, and sizes of TiO 2 nanocrystals were controlled by the contents of graphene oxide functionalized with p -phenylenediamine (RGO-NH 2 ). The obtained N-RGO/TiO 2 nanocomposites exhibited a much higher photocatalytic activity and stability for degradation of methyl blue (MB) and FA compared with other TiO 2 samples under xenon lamp irradiation. For the third cycle, the 10wt%N-RGO/TiO 2 catalyst maintains high photoactivity (87%) for the degradation of FA, which is much better than the TiO 2 -N/F (61%) in 3 h. This approach supplies a new strategy to design and synthesize metal oxide and graphene oxide nanocomposites with highly efficient photocatalytic performance.
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JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Ke Liu,Lixiang Shi,Yaxin Guo,Shiduo Hao,Yunpu Zhai,Yonggang Liu
Cu-based Fenton-like systems have demonstrated high effectiveness in the degradation of organic pollutants, however, challenges still exist to overcome the sluggish cycling of metal ions and fast activation of reactants. Herein, a novel n-p type Cu 2 (OH) 3 F/Cu 2 O photo-Fenton-like catalyst (CFC) was prepared with in-situ reduction of Cu 2 (OH) 3 F and applied for tetracycline hydrochloride degradation. Under optimized condition, the target catalyst (CFC-5) showed excellent activity, achieving a degradation efficiency of approximately 99.93 % in 30 min. The reaction rate constant with CFC-5 was 4.10 and 3.26 times higher than that of Cu 2 (OH) 3 F and Cu 2 O, respectively. Moreover, the Cu 2 (OH) 3 F/Cu 2 O catalyst exhibited highly cycling stability and broad applicability. The results illustrate that construction of Cu 2 (OH) 3 F/Cu 2 O composites facilitates the charge separation and enhances Cu 2+ /Cu + cycling, which benefits the generation of highly oxidizing active species and thus significantly improved the degradation efficiency. Besides, this study offers a versatile method to construct inexpensive and efficient photo-Fenton-like heterojunction catalysts.
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