JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-8
·
IF 2.278
Ren Yanlin,Zhao Qidong,Li Xinyong,Xiong Wei,Tade Moses,Liu Lihong
A novel visible-light-activated photocatalyst consisting of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles were synthesized through a tunable in situ deposition method. The morphology and microstructure of the C 3 N 4 /Ag 3 PO 4 nanocomposites were carefully characterized by scanning electron microscope, TEM, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectra, and so on. The porous C 3 N 4 /Ag 3 PO 4 nanocomposites were featured by the typical platelet-like morphology, with an average crystallite size of about 39 nm. The coexistence of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles is confirmed via the XRD and EDX results. Owing to its narrower band gap of Ag 3 PO 4 , the nanocomposites displayed a significant redshift of UV–Vis spectral absorption edge together with expanded light absorption in comparison with g-C 3 N 4 nanosheets. The photocatalytic activity of the prepared C 3 N 4 /Ag 3 PO 4 nanocomposites is demonstrated by the photodegradation of 4-chlorophenol (4-CP). The C 3 N 4 /Ag 3 PO 4 nanocomposites displayed higher photocatalytic activity than pure C 3 N 4 or Ag 3 PO 4 , which could be attributed to the interfacial effect of the nanocomposites in inhibiting the unfavorable recombination of photogenerated electrons and holes. Electron spin resonance spin-trap study implied that the generation of hydroxyl radicals plays the key role in the photodegradation of 4-CP by the C 3 N 4 /Ag 3 PO 4 nanocomposites under visible light irradiation.
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Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 5
·3501-3511
·
IF 3.006
Chen Hongshuo,Liu Haibin,Cui Chuanjin,Zhang Xuechao,Yang Wei,Zuo Yueming
To effectively cut off the transmission of Brucella to humans through milk, a novel biosensor for detection of Brucella was constructed using cysteamine functionalized nanogold (Cys-Au) and 4-Mercaptobenzoic acid (4-MBA) modified gold electrode as the platform. The morphology of the prepared nanomaterials was characterized by laser particle sizer, XPS and SEM, and the results showed the 4-MBA film was modified on the gold electrode surface, and the diameter of successfully prepared nanogold and Cys-Au are about 55 and 65 nm, respectively. The electrochemical performance of the biosensor was tested in Brucella antigen solution by square wave voltammetry (SWV). The results showed the reproducibility and stability of the biosensor were good, the spiked recovery in milk was in the range of 95.12–105.27%, and the minimum detection limit (S/N = 3) was 5.12 × 10 2 cfu/mL with a linear range from 1.6 × 10 2 to 1.6 × 10 8 cfu/mL. In addition, the minimum detection limit was reduced from 5.12 × 10 2 cfu/mL to 7.0 × 10 1 cfu/mL after processing the SWV data by second-order derivative transformation, which showed Second-order derivative transformation is very helpful to further optimize the performance of the sensor. Compared with the previously reported test methods, the prepared biosensors have a wider linear range and lower limit of detection (LOD). Therefore, the constructed biosensor can be used as a promising tool for the trace detection of Brucella in milk samples.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xiaoming Chen,Mingdi Yang,Qishu Qu,Qingchun Zhao,Wensheng Zou
The synthesis and electrochromic properties of a novel regiosymmetric polymer based on 3,4-ethylenedioxythiophene, poly(2,3-bis(bromomethyl)-2,3-dihydrothieno[3,4-b][1,4]dioxine) (PEDOT(MeBr) 2 ) were highlighted. The monomer was electrochemically polymerized via repetitive cycling between 0 and 1.8 V in lithium perchlorate (LiClO 4 )–acetonitrile (ACN) electrolytic medium. The corresponding polymer was characterized by FTIR spectra, scanning electron microscopy, cyclic voltammetry , UV–Vis-NIR spectroscopy and colorimetry . It features a reversible redox process and demonstrates a stable blue-to-transmissive electrochromic behavior with very low driving potentials (−0.1 and 0.65 V). Additionally the polymer film exhibits enhanced optical contrast (60% at 669 nm) and improved coloration efficiency (183.1 cm 2 /C at 100% full contrast during bleaching process) which are higher than those of PEDOT, a relatively longer response time compared with PEDOT and reasonable redox stability.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yuwei Xue,Lihua Liu,Ting Zhang,Ziqi Zhu,Mingjun Xu,Qian Zhang,Junming Hong
There has been growing attention in the combination of metal oxide nanoparticles with metal-organic frameworks (MOFs) for the synergistically intensified catalytic activity . Herein, functional Fe-MOF@Mn 2 O 3 composites were synthesized to activate peroxymonosulfate (PMS) for 4-Cholophenol (4-CP) degradation via a hydrothermal and calcination method. Under the reaction parameters of 2 mM PMS, 0.2 g/L catalyst dosage, and pH 7.0, 91.4% of 4-CP (10 mg/L) could effectively be degraded within 60 min (2.2-fold increase in reaction rate constant compared with pure Mn 2 O 3 ). The excellent degradation performance of Fe-MOF@Mn 2 O 3 /PMS system was attributed to the surface hydroxyl and synergistic effect between iron and manganese. Quenching reaction and EPR analysis revealed both sulfate (•SO 4 - ) and hydroxyl radicals (•OH) were responsible for 4-CP degradation. The Fe-MOF@Mn 2 O 3 composite exhibited intensive catalytic capability as well as electron transfer efficiency according to the electrochemical measurements. Meanwhile, the possible degradation pathways were proposed by analyzing intermediates via LC-MS detection. The results indicates that the Fe-MOF@Mn 2 O 3 /PMS system is effective and adaptable for the treatment of 4-CP in different water conditions.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 23
·2100284
·
IF 2.527
Da Zhang,Jinxin Zheng,Pengfei Zhang,Ronghui Zhao,Zhuo Chen,Meng Wang,Kuilin Deng
In the synthesis of traditional AIE-active polymers with conjugate or multi-benzene system, the troublesome process is still faced such as consuming time, high temperature, catalysis, no water or vacuum, and so on. In this study, the polydihydropyrimidone derivatives (PDPMDs) with AIE properties are facilely synthesized by the introduction of 4-dihydropyrimidone rings onto non-AIE-active intermediate polyureas (PUs) in Biginelli reaction. It is found that the unsymmetrical L- lysine ethyl diisocyanate and butylenediamine played a very important role in the smooth preparation and fluorescence enhancement of PDPMDs. Compared with the intermediate PUs, the fluorescence of PDPMDs is significantly enhanced (35-fold increase), which is mainly due to the intramolecular aggregation of dihydropyrimidone rings on PUs chains. At the same time, with the increase of the content of dihydropyrimidone rings, the fluorescence intensity of PDPMDs also increases, and the emission wavelength shows an obvious red shift. The fluorescence of PDPMDs also showed obvious dependence on excitation wavelength, which further reveals the clusterization-triggering emission (CTE) mechanism. In summary, the strategy of endowing AIE properties to non-AIE active polymer by introducing heterocycles into the backbone through multi-component reaction provides useful guidance for AIE functionalization of other non-AIE materials.
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Chemical Engineering and Processing-Process Intensification
·
2022
·
IF 4.264
Kai Zhu,Wenjie Ye,Meng Hu,Yiping Huang,Jingjing Huang,Hanfei Liu,Hao Zhu,Zhenhao Wei,Feng Zhou
4-nitroaniline has been widely used in the production of antioxidants, dyes and pharmaceuticals. A continuous-flow strategy was exploited for the efficient synthesis of 4-nitroaniline through the noncatalytic amination of 4-chloronitrobenzene with aqueous ammonia in a highly controlled and safe manner, in which N-methyl-2-pyrrolidone was selected as the appropriate solvent. Various conditions (reaction temperature, residence time, 4-chloronitrobenzene concentration, molar ratio of ammonia to 4-chloronitrobenzene, presence of base catalyst) were investigated to improve the synthesis of 4-nitroaniline. The Box-Behnken design in response surface methodology was employed for the optimization of reaction conditions, and over 91% yield of 4-nitroaniline could be achieved. Furthermore, a kinetic model was proposed to guide the design and optimization of the synthesis of 4-nitroaniline.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Bo Luo,Yuerui Wu,Xinran Ren,Huimin Li,Xuanru Li,Gege Wang,Mengjia Wang,Luqi Dong,Mengxing Liu,Wei Zhou,Lailiang Qu
In the search for novel succinate dehydrogenase inhibitor (SDHI) fungicides to control Rhizoctonia solani, thirty-five novel pyrazole-4-carboxamides bearing either an oxime ether or an oxime ester group were designed and prepared based on the strategy of molecular hybridization, and their antifungal activities against five plant pathogenic fungi were also investigated. The results indicated that the majority of the compounds containing oxime ether demonstrated outstanding in vitro antifungal activity against R. solani, and some compounds also displayed pronounced antifungal activities against Sclerotinia sclerotiorum and Botrytis cinerea. Particularly, compound 5e exhibited the most promising antifungal activity against R. solani with an EC50 value of 0.039 μg/mL, which was about 20-fold better than that of boscalid (EC50 = 0.799 μg/mL) and 4-fold more potent than fluxapyroxad (EC50 = 0.131 μg/mL). Moreover, the results of the detached leaf assay showed that compound 5e could suppress the growth of R. solani in rice leaves with significant protective efficacies (86.8%) at 100 μg/mL, superior to boscalid (68.1%) and fluxapyroxad (80.6%), indicating promising application prospects. In addition, the succinate dehydrogenase (SDH) enzymatic inhibition assay revealed that compound 5e generated remarkable SDH inhibition (IC50 = 2.04 μM), which was obviously more potent than those of boscalid (IC50 = 7.92 μM) and fluxapyroxad (IC50 = 6.15 μM). Furthermore, SEM analysis showed that compound 5e caused a remarkable disruption to the characteristic structure and morphology of R. solani hyphae, resulting in significant damage. The molecular docking analysis demonstrated that compound 5e could fit into the identical binding pocket of SDH through hydrogen bond interactions as well as fluxapyroxad, indicating that they had a similar antifungal mechanism. The density functional theory and electrostatic potential calculations provided useful information regarding electron distribution and electron transfer, which contributed to understanding the structural features and antifungal mechanism of the lead compound. These findings suggested that compound 5e could be a promising candidate for SDHI fungicides to control R. solani, warranting further investigation.
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PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2908-2915
·
IF 3.665
Shuai Wen,Qiang Liu,Wentian Liang
The linear benzyl chlorine-free poly(4-acetoxystyrene) (PSTO) with low polydispersity ( M w / M n = 1.3) is obtained through anisole quenching of the living polymerization of 4-acetoxystyrene initiated with the St–Cl/SnCl 4 /n-Bu 4 NBr system in CH 2 Cl 2 . The alkylation reaction rate increases with increasing anisole concentration and temperature. With a 4-fold excess of anisole over the initiator, end-chlorine groups are completely capped by anisole in 30 minutes at −15°C through adding extra SnCl 4 prior to the alkylation reaction. In addition, by using 2-methylanisole and 2,6-dimethylanisole as capping agents, it is verified that both para- and ortho-positions substitution of living PSTO cations to the anisole occur during alkylation reactions.
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Journal of Nano Research
·
2021
·
IF 2.929
Bi Quan Su,Yinxia feng,Liang Xian,Li Sheng,Qi Qi Li
Photochemistry to prepare platinum nanoparticles (Pt NPs) is an essential way to control Pt NPs catalyst size distribution. This article reports a series of morphologically controlled syntheses of Pt NPs loaded on modified carbon nanotube (Pt-CNTs). In the synthesis, Polyethylene glycol (PEG) participates in reactions both as a reducing agent and a stabilizer. Visible light irradiation was adopted as a kinetic controlling approach. Typical 4-nitrophenol (4-NP) reduction was adopted to probe the catalytic performances. Characterizations prove that visible light irradiation is an effective way to control the reaction process. In the optimized reaction conditions, i.e., when the ratio PEG:H2O is 1:9, and the pH is 10, the as-prepared Pt NPs are consequently in a very narrow sized distribution with an average diameter of 1.29 nm. The Pt-CNTs present a high reaction rate constant of 0.624 min-1 in the catalytic reduction of 4-NP. All the research results are beneficial for exploring more green chemistry and facile photochemical approaches in the controlled preparation of Pt nanocatalysts.
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SOLAR ENERGY
·
2023
·
IF 6.7
Yonggang Zhao,Qiaogang Song,Zhineng Zhou,Yufei Chen,Ying Zhang,Lang Wu,Xu Su,Xinghuan Hu,Shurong Wang
In the solution method, the surface morphology characteristic of the precursor film is essential for obtaining the high quality of the absorber layer. Herein, the post-heating treatment (PHT) precursor films were adopted to modify the morphology significantly and the effects of different PHT temperatures on the properties of precursor films, absorber layer films, and photovoltaic devices were investigated. The precursor film with a more porous surface could be obtained by PHT, which facilitates the downward diffusion of Se easily during sulfoselenization and the formation of a large-grain-spanning monolayer structure. Furthermore, the Cu 2 ZnSn(S, Se) 4 absorber layer surface holes were significantly reduced, owing to sufficient grain growth during sulfoselenization. As a result, the device efficiency with PHT was increased to 11.07% mainly due to improved Cu 2 ZnSn(S, Se) 4 absorber spectral response. This study might provide a new potential method for adjusting precursor film morphology and thus enhancing the corresponding device performance.
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CURRENT ORGANIC CHEMISTRY
·
2012
·Vol. 16
·期 22
·2745-2751
·
IF 3.064
Khalid Khan,Hong Huang,Yan-Song Zheng
A new family of non-ionic amphiphilic dendro-calix[4]arene bearing hydrophilic branched substituents at the upper rim and lipophilic alkyl chains at the lower rim was designed and synthesized. Micelles of various sizes are obtained due to the amphiphilic nature of the calix[4]arene derivatives in aqueous medium. The amphiphilic calix[4]arene derivatives effectively load hydrophobic dye such as alizarin yellow via secondary interactions such as hydrogen bonding and π-π stacking. The length of alkyl chain and the intrinsic cyclic nature of calixarene scaffold have shown a significant impact on the transport potential of all amphiphiles.
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Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 19
·2973-2977
·
IF 4.568
Jun Zhou,Sha Yang,Yesen Tan,Huaisheng Cheng,Jinsong Chai,Manzhou Zhu
The change in the valence state of nanocluster can induce remarkable changes in the properties and structure. However, achieving the valence state changes in nanoclusters is still a challenge. In this work, we use Cu 2+ as dopant to “oxidize” [Ag 62 S 12 (SBu t ) 32 ] 2+ (4 free electrons) to obtain the new nanocluster: [Ag 62−x Cu x S 12 (SBu t ) 32 ] 4+ with 2 free electrons. As revealed by its structure, the [Ag 62−x Cu x S 12 (SBu t ) 32 ] 4+ (x=10∼21) has a similar structure to that of [Ag 62 S 12 (SBu t ) 32 ] 2+ precursor and all the Cu atoms occupy the surface site of nanocluster. It′s worth noting that with the Cu atoms doping, the [Ag 62−x Cu x S 12 (SBu t ) 32 ] 4+ nanocluster is more stable than [Ag 62 S 12 (SBu t ) 32 ] 2+ at higher temperature and in electrochemical cycle. This result has laid a foundation for the subsequent application and exploration. Overall, this work reveals crystals structure of a new Ag−Cu nanocluster and offers a new insight into the electron reduction/oxidation of nanocluster.
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