ChemistrySelect
·
2022
·Vol. 7
·期 45
·e202204071
·
IF 2.307
Liang Xian,Jing Ma,Wei Li,Yanzhong Yang,Xu Gao,Bei Xi,Xiaoxia Tian
Graphical Under visible light irradiation at low temperature, uniformly dispersed ultrafine platinum(Pt) nanocatalysts was loaded on fullerene (C 60 ) without adding any reducing agent or stabilizing agent, and was effectively used to catalyze the reduction of 4-nitrophenol. The results show that Pt nanoparticles with good catalytic activity can be finally formed under the action of visible light. This green visible light chemical synthesis method is expected to be popularized in the field of catalysis. Here, uniformly dispersed ultrafine platinum nanocatalysts (Pt/C 60 ) were synthesized on C 60 by ice-photochemical method using potassium chloroplatinate (K 2 [PtCl 4 ]) as platinum source under the condition of low temperature, no stabilizer and reducing agent. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM) were used to study the composition and morphology of Pt/C 60 catalyst. It was confirmed that Pt Ultra-small Particles (Pt UPs) was loaded on C 60 surface with high dispersion. The average particle sizes of the three samples obtained under different reaction conditions were 1.41±0.1 nm, 1.54±0.4 nm and 1.73±0.3 nm, respectively. The results show that the light-induced effect and the ice lattice domain limiting effect in the frozen state effectively control the formation and growth of platinum clusters in the process of Pt 2+ reduction to Pt 0 . The rate constants of the three samples were 0.89 min −1 , 0.31 min −1 , 0.19 min −1 , respectively, showing high catalytic activity in the study of the catalytic performance of Pt/C 60 degradation of 4-nitrophenol (4-NP) by Ultraviolet-visible spectroscopy (UV-Vis). This method provides a meaningful attempt for the study of green chemical synthesis method of platinum metal catalysts.
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 24
·期 1
·77-82
·
IF 3.545
Dandan Wang,Xiaoqing Jiang,Pifu Gong,Xinyuan Zhang,Zheshuai Lin,Zhanggui Hu,Yicheng Wu
An alkali metal gallium iodate, Cs3[Ga2O(I3O9)(IO3)4(HIO3)] (CGIO), was synthesized by the traditional hydrothermal method. Interestingly, CGIO revealed a novel I3O93− fundamental building block (FBB) constituted by two IO3 tetrahedrons and one IO5 polyhedron through sharing O atoms. The new I3O93− trimer forms a 0D [Ga2O(I3O9)(IO3)4(HIO3)]3− anion cluster together with the [Ga2O11]16− dimer and isolated IO3− units. The UV-vis-NIR diffuse reflectance spectrum of CGIO shows a wide bandgap of 4.05 eV, and the thermal stability could reach above 400 °C. First-principles calculations explicated that the optical properties of CGIO mainly originated from the iodate anion units with a calculated birefringence of 0.04 at 1064 nm.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 312
·期 2
·187-198
·
IF 1.282
Zheng Zhiyang,Wang Youqun,Zhao Wuwei,Xiong Guoxuan,Cao Xiaohong,Dai Ying,Le Zhanggao,Yu Shenglong,Zhang Zhibin,Liu Yunhai
Hydrothermal carbon spheres (HCSs) functionalized with 4-aminoacetophenone oxime group (HCSs-oxime) were prepared by a grafting method and explored to adsorption of uranyl ions from aqueous solution. The results of FT-IR, elemental analysis and zeta potential indicate a successfully modification with oxime group. The adsorbent shows an excellent adsorption capacity (Langmuir, q
m
= 588.2 mg g −1 ) and quick adsorption kinetic (equilibrium time of approximately 60 min) at optimal pH of 6.0. The adsorptive selectivity for uranyl ions has been also great improved in present with various co-existing ions. Overall, HCSs-oxime is a potentially promising material for selective removal of uranium in the contaminated solution.
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Polymers
·
2021
·Vol. 13
·期 15
·2388
·
IF 4.329
Meina Xie,Daikun Jia,Jin Hu,Jiyu He,Xiangmei Li,Rongjie Yang
In this study, the aromatic acetylene compound 4-(phenylethynyl) di(ethylene glycol) phthalate (PEPE) was used as a chain extender, partially replacing 1,4-butanediol. To synthesize an intrinsic flame-retardant thermoplastic polyurethane elastomer (TPU) with an aromatic acetylene structure, PEPE was synthesized by a two-step polymerization. The flame retardancy, thermal stability, and mechanical properties of TPU were studied. The microstructure of TPU char was investigated by scanning electron microscopy to analyze the flame-retardant mechanism. The tensile strength of TPU containing 1.35 wt% PEPE was 39.2 MPa, which was almost twice as much as neat TPU, showed a dramatic decrease in the peak heat release rate and total heat release, and declined by 46.2% and 24.5%, respectively. After the flame-retardant TPU burned, a cross-linked network foaming char structure was formed. The results showed that PEPE improved the mechanical properties of TPU and conferred good stability that promoted the formation of charcoal and reduced heat release during the combustion of TPU.
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CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6513-6519
·
IF 3.849
Yuhang Wu,Congyan Li,Kaiwen Zhou,Yanhong Zhao,Xiaojing Wang
A novel catalyst, CeO2@Ag/Ag2Ta4O11, was successfully assembled via an in situ catalytic process for 4-nitrophenol reduction. As-prepared samples were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The results showed the elementary substance Ag was produced from Ag2Ta4O11 after a circular reduction reaction and was homogeneously deposited on the surface of Ag2Ta4O11 nanoparticles, which were wrapped by octahedron-shaped CeO2. The as-prepared nanocomposites exhibited extremely accelerated catalytic activity toward the efficient reduction of 4-nitrophenol compared to pure CeO2 and Ag2Ta4O11 nanoparticles. 15 rounds of recycling experiments confirmed that the samples exhibited good reuse stability, assigned to the confined robust shield of CeO2. The shell of CeO2 efficiently prevented undesirable aggregation and leaching of Ag nanoparticles. The persistent ascending activity with an increasing number of experimental runs was related to the amount of metallic Ag gradually growing. Moreover, it was proposed that the active interfacial contact between ceria oxide/metallic Ag/the semiconductor Ag2Ta4O11 (CeO2@Ag/Ag2Ta4O11) in the core–shell structure facilitated the transfer of electrons, contributing to the enhanced activity.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Muhammad Yasir Nawabi,Waqar Uddin,Gang Hu,Saif Ullah,Zhaohui Fang,Saira Sardar
In this article, we presented an innovative work of distinguishing the two different positional heterosubstituents-aromatic isomers i.e. 4-hydroxycoumarin (4-HC) and 7-hydroxycoumarin (7-HC) on their perturbation effect by a novel analytical Belousov-Zhabotinskii (BZ) oscillator. In such BZ oscillator, the tetra-aza-macrocyclic copper complex ([CuL](ClO4)2) was used in which the ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraeazacyclotetradeca-4,11 diene. Experimental data confirmed that, by discrete injection of these two isomers (4-HC and 7-HC) into the active BZ system with equal concentrations reflected in their inhibition time (t in ), but the tin produced by 4-HC was higher than the tin initiated by 7-HC. The interesting feature is that, with increasing concentrations (9.0 x 10 -5 to 3.6 x 10 4 ) of 4-HC constantly increase the tin and decreased the oscillation number (N) after the regeneration of oscillation. Whereas, the upsurge concentrations of 7-HC didn’t change the tin but reduced the N after regeneration of oscillation. Thus, the two isomers were identified. Based on the mechanistic approach of FKN (Field-Koros-Noyes) model, the reaction perturbation mechanism was discussed. A fleeting description is that both 4-HC and 7-HC isomers were oxidized by BrO 2 intermediate radical (which produce during the course of reaction) into salicylic acid and quinone respectively and the system was temporary freeze (t in ) as well. The products (salicylic acid and quinone) were identified by infra-red and Ultra-Visible spectroscopies.
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Polymers
·
2022
·Vol. 14
·期 23
·5255
·
IF 4.967
Xiaohong Yi,Jingshu Huang,Yizhang Tong,Hui Zhao,Xianwu Cao,Wei Wu
Biodegradable polylactide (PLA) has been widely utilized in people’s daily lives. In order to improve the fire safety of PLA, ammonium polyphosphate (APP) was self-assembled onto the surface of serpentine Ni3Si2O5(OH)4through the electrostatic method, followed by mixing with PLA by melt compounding. The APP-modified serpentine (serpentine@APP) dispersed uniformly in the PLA matrix. Compared with pure PLA, the PLA composite with 2 wt% serpentine@APP reduced the peak heat release rate (pHRR) and total heat release (THR) by 43.9% and 16.3%, respectively. The combination of APP and serpentine exhibited suitable synergistic flame-retardant effects on the fire safety enhancement of PLA. In addition, the dynamical rheological tests revealed that the presence of APP and serpentine could reduce the viscosity of PLA composites. The plasticizing effects of APP and serpentine benefited the processing of PLA. The mechanical properties of PLA/serpentine@APP maintained suitable performance as pure PLA. This study provided a feasible way to enhance the fire safety of PLA without sacrificing its mechanical properties.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2022
·
IF 6.437
Yang Li,Bin Hu,Hao Fu,Zhen-xi Zhang,Zi-teng Guo,Guan-zheng Zhou,Ling-jun Zhu,Ji Liu,Qiang Lu
4-Vinylphenol (4-VP) is a value-added phenol compound, which can be obtained from the pyrolysis of herbaceous biomass, and its yield can be further improved through the in-situ catalytic fast pyrolysis process. Herein, a barium-magnesium mixed metal oxide (BaMg-MMO) catalyst was developed and employed for the selective production of 4-VP from bagasse fast pyrolysis. The effects of Ba/Mg molar ratio in the BaMg-MMO catalyst, pyrolytic temperature, catalyst-to-bagasse (CA-to-BA) ratio were carefully investigated based on pyrolysis-chromatography/mass spectrometry (Py-GC/MS) tests. The 4-VP yield reached a maximal of 7.3 wt% with the corresponding selectivity of 44.4% at 300 °C under the Ba/Mg molar ratio of 1:1 and the CA-to-BA ratio of 4:1, compared with that of 5.0 wt% in the non-catalytic process. Moreover, a series of lab-scale fast pyrolysis tests of bagasse were carried out in a fixed bed reactor using BaMg-MMO with a Ba/Mg molar ratio of 1:1. The highest 4-VP yield and selectivity were 7.1 wt% and 56.6% at 300 °C with the CA-to-BA ratio of 1:1. The results indicated that BaMg-MMO could provide a promising catalytic performance on the formation of 4-VP during the fast pyrolysis of bagasse.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Zhongjia Wu,Junlun Zhu,Wei Wen,Xiuhua Zhang,Shengfu Wang
4-Nitrophenol (4-NP) is water pollutant with good stability, high toxicity and difficult degradation, which will cause great harm to the environment. Thus, the development of high efficiency and rapid catalysts for the degradation of 4-NP will be an urgent problem to be solved. Herein, we synthesized covalent organic framework supporting Cu/Ag bimetallic nanoparticles (Cu/Ag–COF), which had better catalytic activity for the reduction of 4-NP. The porous COF possess large surface area of approximately 737.8 m 2 /g, so it can provide abundant sites for loading metal nanoparticles . At the same time, COF could also improve the stability and catalytic effect of nanocatalyst under flexible condition. The prepared Cu/Ag–COF exhibited the higher catalytic reduction of 4-NP into 4-aminophenol (4-AP) under the condition that the molar ratio of NaBH 4 to 4-NP was 147 and achieved an apparent rate constant of k Cu/Ag – COF = 0.0073 s −1 . The apparent rate constant of Cu/Ag–COF was higher than that of Ag–COF ( k Ag-COF = 0.0032 s −1 ) and Cu–COF ( k Cu-COF = 0.0047 s −1 ), indicating that this system had a synergistic catalytic effect to improve the catalytic activity of metal nanoparticles . Moreover, Cu/Ag–COF still had good catalytic effect after eight cycles, which indicated that it had good stability and reusability. This work provides a novel strategy to fabricate COF supported nanoparticles for outstanding performance in treating wastewater containing 4-NP.
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高影响因子
Solar RRL
·
2023
·Vol. 7
·期 24
·2300838
·
IF 7.9
Ding Ma,Mengge Li,Bin Yao,Yongfeng Li,Zhanhui Ding,Jiayong Zhang,Chunkai Wang,Yuting Sun,Yue Liu,Xiaofei Sun,Yan Zhu
It is known that high carrier recombination at the p–n junction interface and low carrier separation ability (CSA) are two main problems resulting in low power conversion efficiency (PCE) of the Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cell. To resolve these problems, one CZTSSe solar cell is prepared through substituting B-doped CdS for CdS in a solar cell with the conventional structure of Ag/ITO/ZnO/CdS/CZTSSe/Mo/SLG and annealing B-doped CdS/CZTSSe/Mo/SLG prior to deposition of ZnO, ITO, and Ag electrode. By optimizing the B doping content in the CdS and annealing temperature and time of the B-doped CdS/CZTSSe, lattice mismatch between CdS and CZTSSe is decreased and width of depletion region is increased, leading to reduction in interfacial recombination, enhancement in CSA and intensity of incident light passing through the B-doped CdS, and so increase in PCE from 7.89% of CZTSSe solar cell using CdS as buffer layer to 10.62%. A mechanism of the increment of the PCE induced by B doping and annealing is suggested. This work proposes a method of increasing PCE of CZTSSe solar cell and advances a deeper understanding of the mechanisms behind various parameters in CZTSSe solar cells through theoretical analysis and calculations.
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Journal of Water Process Engineering
·
2023
·
IF 7
Zijun Xie,Bo Sun,Hongying Lin,Meng Fu,Yi Zhang,Zequn Ma,Xiangming Li
Dephosphorylation that separates phosphate groups from substrates is a significant reaction for both living organisms and environmental protection. Meanwhile, 4-nitrophenol (4-NP) is known to be a popular organic compound used for pesticides production, which is genotoxic and carcinogenic to humans and animals. Herein, we have developed a bifunctional catalyst that can be used for simultaneous dephosphorylation and 4-nitrophenol (4-NP) reduction when para-nitrophenyl phosphate (p-NPP) serves as the model compound. This bifunctional catalyst was obtained by in-situ growth of NiFe layered double hydroxide on the reduced graphene oxide/polyelectrolytes assembly nanolayers (denoted as rGP 3.5 /NiFe LDH). The results demonstrate that the rGP 3.5 /NiFe LDH can activate dephosphorylation of p-NPP at 20 °C and the catalytic efficiency increases significantly with increasing temperature in the range of 20 °C to 90 °C. Moreover, by-product 4-NP formed through p-NPP dephosphorylation is further fully converted to 4-aminophenol by the rGP 3.5 /NiFe LDH within 15 min. As far as we know, this is the first example for both dephosphorylation and 4-NP reduction through NiFe LDH as bifunctional catalysts, which paves the way for the development of multiple potential applications for NiFe LDH.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Pan,Congying Rao,Xiaolin Tan,Yun Ling,Ayushi Singh,Abhinav Kumar,Baohong Li,Jianqiang Liu
Rational designing of carbon-based adsorbent precursors is an important way to enhance adsorption performance. In this work, fascinating Co@C composites have been designed and fabricated using a new cobalt-seamed metal–organic nanocapsule (Co-MONC), which exhibits incredibly high adsorption capacity for chlorpromazine (CPZ) removal from aquatic environments. Benefiting from its interconnected micro- and mesoporous structures, well-dispersed and highly available Co adsorption active sites, the optimal Co@C-900 exhibits ultrahigh CPZ adsorption capacity (1039.53 mg g −1 ) and excellent recycling ability, outperforming the reported porous materials and commercial activated carbon. Moreover, the adsorption behaviors of CPZ for the composite have been comprehensively investigated and the plausible adsorption mechanism was proposed. Apart from this, the interaction mechanism between exposed Co adsorption active sites and CPZ have been suggested with the aid of density functional theory (DFT) calculations. The presented investigation demonstrated a facile and designable strategy for the fabrication of highly effectively adsorbents for organic contaminant removal.
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危险品化学品经营许可证（带存储）