Molecular Catalysis
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2021
·
IF 5.062
Jian He,Zhaozhuo Yu,Hongguo Wu,Hu Li,Song Yang
Effective synthesis of aromatic compounds from renewable biomass is highly important yet challenging. p -Cymene is an attractive aromatic compound with various promising applications in the manufacture of fine chemicals. In this study, a novel and effective catalytic system based on mesoporous tin phosphate (M-SnPO) with Lewis-Brønsted dual acidity was developed for the fast synthesis of p -cymene from the cyclodehydration of bio-based citral. Up to 78.5% yield of p -cymene was achieved from the cyclodehydration of citral at 180 °C within only 0.5 h, superior to the results reported for benchmark homogeneous acid catalysts. Characterization of as-prepared M-SnPO catalyst via various techniques indicates that the synergic effect of Lewis and Brønsted acidic sites, large pore-sized structure, and high surface area are responsible for its remarkable catalytic performance. In addition, the effectiveness of the M-SnPO catalyst could be almost sustained over multiple cycles without significant loss. The work herein is the first example of developing a Lewis-Brønsted dual acidic heterogeneous catalyst for the fast synthesis of p -cymene from the cyclodehydration of citral.
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高影响因子
ENERGY & FUELS
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2021
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IF 3.605
Jin-Long Yi,Xiang-Hui Yu,Ru-Liang Zhang,Lei Liu
Reasonable porous structure and proper heteroatom doping have great influences on electrode materials for supercapacitors. Herein, O, N, and P codoped hierarchical porous carbon (ONPC) was synthesized through a one-pot carbonization–activation strategy by using chitosan as the carbon precursor, phosphoric acid as the activator, and melamine foam as the skeleton. The use of melamine foam facilitated the formation of an interconnected carbon framework and introduced more nitrogen functional groups. Owing to the hierarchical pore structure, large surface area (1588 m2 g–1), and significant heteroatom contents of O (8.61%), N (7.95%), and P (1.34%) in the carbon matrix, the 700 °C carbonized sample ONPC-700 had a specific capacitance of 230 F g–1 at 0.2 A g–1. A high energy density of 7.5 Wh kg–1 at 100 W kg–1 was achieved for the supercapacitor fabricated with two identical ONPC-700 electrodes. Furthermore, the capacitance retention of the device was evaluated to be as high as 86.53% after 8000 cycles.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-13
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IF 5.833
Xu Yeqing,Huang Ting,Meng Minjia,Yan Yongsheng
A highly effective fluorescent molecularly imprinted sensor (F-PDA-MIS) based on fluorescent polydopamine (F-PDA) was successfully synthesized for selective and ultrafast detection of p-nitrophenol (P-NP) in drinking water. F-PDA with abundant surface functional groups has been artfully modified to firstly serve as both fluorescent monomer and functional monomer in the synthesis of a uniform luminous F-PDA-MIS, which can greatly improve the detection efficiency. As expected, F-PDA-MIS had an obvious emission wavelength of 535 nm with the optimal excitation wavelength at 400 nm. Specially, F-PDA-MIS could detect P-NP in the range 100 to 1100 nM with much lower detection limit of 24.2 nM within 120 s compared with other conventional imprinted fluorescent sensors based on pure quantum dots (QDs) or dyes. This excellent test phenomenon is mainly ascribed to the rapid electron transfer between F-PDA and P-NP. Satisfactory recovery of 98.0–104% for mineral water and 98.6–106% for boiling water were obtained with relative standard deviations (RSDs) of 2.7–3.4% and 2.6–3.5% respectively. The detection reliability of F-PDA-MIS was verified by the comparison with high-performance liquid chromatography (HPLC–UV). Consequently, F-PDA as a fluorescence functional monomer has been shown to be a possible strategy to effectively improve the detection limit and shorten response time of the target determination in water.. Graphical abstract
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高影响因子
Environmental Science-Nano
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2021
·Vol. 8
·期 12
·3629-3642
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IF 8.131
Jiaojiao Wang,Xiaoqing Jia,Denghui Shang,Liangbo Xie,Yi Li,He Zhang,Sihui Zhan,Wenping Hu
The long-term overuse of ciprofloxacin has resulted in its ubiquitous release into aquatic environments, seriously threatening public and ecological security. Herein, a photo-assisted-electro-Fenton-like (PAEF-like) system using p–n type Cu2O/Bi2MoO6 (CBM) as photoelectric catalyst was designed for efficient ciprofloxacin removal. The realization of photo-assisted function benefited from the perfectly constructed p–n heterojunction, which effectively regulated the carrier migration behaviors and drove the directional delivery of photoinduced electrons with flexible reactivity. Furthermore, photoinduced electrons directly or indirectly promoted the activation of H2O2 to enhance the ability of the PAEF-like synergy system to form ˙OH, improving the photoelectric catalytic activity. As dominant active species, ˙OH cooperated with h+ and ˙O2−, leading to the efficient elimination of ciprofloxacin. Finally, the degradation rate within 120 min reached almost 100%, and the corresponding kinetic constant was 208 and 1.5 times that of the photocatalytic and EF-like system, separately. Importantly, CBM-25% still maintained superior removal effect after four consecutive runs, revealing the high stability and practical feasibility of the PAEF-like system.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2021
·Vol. 25
·期 5
·1503-1512
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IF 2.647
Zhang Aiqin,Xiao Yuanhua,Cao Yang,Fang Hua,Zhang Yong,Das Paramita,Zhang Huan
Transition metal–based catalysts are considered to be promising materials to replace noble metal catalysts for electrocatalytic water splitting. Herein, a flexible electrode composed of Co-Ni-P ternary catalysts and carbon fiber paper substrate (Co-Ni-P/CFP) was successfully fabricated and applied in water electrolysis. The Co-Ni-P coatings were deposited on CFP by a one-step cyclic voltammetric electrodeposition method and the surface of the composite material exhibits nano-reticular structure. The formation mechanism was also discussed according to the results of material characterization. Notably, the Co-Ni-P/CFP flexible electrode exhibited superior catalytic performance for both hydrogen and oxygen evolution reactions in alkaline media, which could achieve 10 mA/cm 2 current density with overpotential of 89 mV for HER and 320 mV for OER. Moreover, the Co-Ni-P/CFP electrode could also be used as both anode and cathode electrode to drive overall water splitting and required only 1.64 V to achieve a current density of 10 mA/cm 2 , which was very close to that of the commercial combination of Pt/C and IrO 2 . This affordable and easily obtained electrode offers a new avenue to develop earth-abundant resource catalysts for water electrolysis system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Huanan Zhao,Zipeng Xing,Siyi Su,Sijia Song,Zhenzi Li,Wei Zhou
NH 2 -MIL-53(Al)/CdS p-n heterojunctions are fabricated via facile two-step hydrothermal method. The formation of p-n heterojunctions could form built-in field, which favors spatial charge separation. The resultant NH 2 -MIL-53(Al)/CdS p-n heterojunctions with narrowed band gap extend the photoresponse, and have a high specific surface area of 417.7 m 2 g −1 , and a narrow pore size of 8.8 nm. Under visible light irradiation, the photocatalytic efficiency for reduction of Cr(VI) and removal of refractory pesticide trichlorophenol is up to 99.23 and 98.85 %, respectively. The photocatalytic oxygen evolution is also as high as 563.6 μmol g −1 h −1 . The excellent photocatalytic activity can be ascribed to the efficient p-n heterojunctions accelerating charge transfer and favoring spatial charge separation, and the special mesoporous structure supplying adequate surface-active sites and facilitating mass transfer. This facile strategy opens up new insights for fabricating other p-n heterojunctions photocatalysts with efficient solar energy conversion.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Fenyang Tian,Shuo Geng,Lin He,Yarong Huang,Akhmat Fauzi,Weiwei Yang,Yequn Liu,Yongsheng Yu
Transition metal phosphides have shown Pt-like hydrogen evolution reaction (HER) activity in acid and alkaline solution, while their HER performance in neutral-pH is really poor owing to the high resistance and inefficient mass transfer in neutral-pH electrolyte. In this work, the well-arranged core/shell PSS-PPy/Ni-Co-P growing on Cu foil, in which Ni-Co-P is the core and the mixed polymer of pyrrole and sodium polystyrene sulfonate is the shell, has been demonstrated to be a highly efficient electrocatalyst for HER in neutral-pH electrolyte. The PSS-PPy/Ni-Co-P/CF self-supporting electrode was easily synthesized by electrodeposition and chemical deposition at room temperature. According to the experiment and DFT calculation results, PSS-PPy not only improves the conductivity and hydrophilicity of Ni-Co-P, but also optimizes the electronic structure of Ni-Co-P. Thus, the PSS-PPy/Ni-Co-P shows remarkable HER activity with only overpotential of 106 and 67 mV at the current density of 10 mA cm −2 in neutral-pH and alkaline electrolytes, respectively. Furthermore, PSS-PPy/Ni-Co-P has excellent stability in neutral-pH, alkaline electrolytes and even seawater. The current surface modification method directs us to design more low-cost, high-efficiency and stable electrocatalysts for HER in neutral-pH electrolyte.
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Polymers
·
2021
·Vol. 13
·期 14
·2324
·
IF 4.329
Liusi Wang,Haoliang Li,Shuxing Xiao,Mohan Zhu,Junhe Yang
With the development of integrated devices, the local hot spot has become a critical problem to guarantee the working efficiency and the stability. In this work, we proposed an innovative approach to deliver graphene foam/polyaniline@epoxy composites (GF/PANI@EP) with improvement in the thermal and mechanical property performance. The graphene foam was firstly modified by the grafting strategy of p-phenylenediamine to anchor reactive sites for further in-situ polymerization of PANI resulting in a conductive network. The thermal conductivity (κ) and electromagnetic interference shielding (EMI) performance of the optimized GF/PANI4:1@EP is significantly enhanced by 238% and 1184%, respectively, compared to that of pristine EP with superior reduced modulus and hardness. Such a method to deliver GF composites can not only solve the agglomeration problem in traditional high content filler casting process, but also provides an effective way to build up conductive network with low density for thermal management of electronic devices.Keywords:graphene foam;in-situ polymerization;conductive network;thermal management;EMI shielding
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PubMed
高影响因子
Nano Materials Science
·
2021
·
IF 0
Ning You,Shuai Cao,Mengqiu Huang,Xiaoming Fan,Kun Shi,Haijian Huang,Zhangxian Chen,Zeheng Yang,Weixin Zhang
Improving catalytic activity and durabilty through the structural and compositional development of bifunctional electrocatalysts with low cost, high activity and stability is a challenging issue in electrochemical water splitting. Herein, we report the fabrication of heterostructured P-CoMoO 4 @NiCoP on a Ni foam substrate through interface engineering, by adjusting its composition and architecture. Benefitting from the tailored electronic structure and exposed active sites, the heterostructured P-CoMoO 4 @NiCoP/NF arrays can be coordinated to boost the overall water splitting. In addition, the superhydrophilic and superaerophobic properties of P-CoMoO 4 @NiCoP/NF make it conducive to water dissociation and bubble separation in the electrocatalytic process. The heterostructured P-CoMoO 4 @NiCoP/NF exhibits excellent bifunctional electrocatalysis activity with a low overpotential of 66 mV at 10 mA cm −2 for HER and 252 mV at 100 mA cm −2 for OER. Only 1.62 V potential is required to deliver 20 mA cm −2 in a two-electrode electrolysis system, providing a decent overall water splitting performance. The rational construction of the heterostructure makes it possible to regulate the electronic structures and active sites of the electrocatalysts to promote their catalytic activity.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Yuxiao Gong,Lian-Hua Xu,Junji Li,Dan Shan
Research of highly dispersed transition metal phosphides (TMPs)-based catalysts for electrocatalytic hydrogen evolution is of great significance in the area of renewable energy. Herein, the high dispersion of FeNiP nanoparticles on N, P-doped electrospun carbon fibers was realized via the confinement effect induced by phytic acid (PA) and polyacrylonitrile (PAN), as well as electrospinning technique. PA and PAN were used as ligand for coordinating transition metal (TM) ions and carbon sources, respectively. In addition, the nucleophilic addition reaction between PA and PAN resulted in the cyclization of PAN and the further formation of a supramolecular network. Besides, the chelating ability of PA to TM ions was also modulated. Benefitting from the confinement effect, the optimized FeNiP/NPC800 exhibit good hydrogen evolution reaction (HER) activities for achieving a current density of 10 mA cm −2 at an overpotential of 277 mV in 0.5 M H 2 SO 4 .
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Tao Li,Lin Dai,Yixin Huang,Siwen Pan,Zijun Pang,Jing Zou
Nowadays, a number of spectrophotometric methods for Cr(VI) determination have been developed. Whereas most of them are sensitive to pH, metallic ions, temperature, etc, which render them out of feasibility and may result in erroneous measurement. Therefore, to overcome these drawbacks, a new spectrophotometric method with rapid detection, high accuracy and strong anti-interference ability was established. This method is based on the oxidative coloration of N,N -diethyl- p -phenylenediamine (DPD) and Cr(VI) to generate pink-colored DPD •+ radicals which showed maximum absorbance at 551 nm. Accordingly, different reaction parameters were optimized, the calibration curves (linear range 0.85–60 µM) were established with a high sensibility of (3.05 ± 0.02) × 10 4 M −1 cm −1 . The LOD and LOQ were determined to be 0.26 µM and 0.85 µM respectively, accompanied with a stoichiometric coefficient of near 1:3 (1:2.78). The DPD method exerted a satisfactory accuracy in natural water samples and a pretty good anti-interference performance towards various common co-existing metallic ions. Moreover, this method was successfully applied in the Cr(VI)-sulfite and Cr(VI)-hydroxylamine systems. Overall, the study highlights the DPD method as a promising approach for the Cr(VI) determination and provides a new perspective for the practices of spectrophotometry .
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 8
·2298-2309
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IF 3.174
Shizi Luo,Xinyan Xiao,Yi Wang,Mingli Lu
BACKGROUND The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work. RESULTS The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed. CONCLUSION The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that ·O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed. © 2021 Society of Chemical Industry (SCI).
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