ACS Omega
·
2022
·
IF 4.132
Weiwei Tie,Surjya Sarathi Bhattacharyya,Cancan Han,Shuaibiao Qiu,Weiwei He,Seung Hee Lee
A novel high-performance BiOBr@graphene (BiOBr@G) photocatalyst with a new assembly structure had been demonstrated using a facile hydrothermal method through chemical bonding of reduced graphene oxide and structure-defined BiOBr flakes for improving charge separation and transfer performance, which were first synthesized at room temperature in immiscible solvents without corrosive acids. The prepared samples were characterized, and the BiOBr@G composite realized an efficient assembly portfolio of graphene and BiOBr flakes with defined structures, verified by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman and X-ray photoelectron spectroscopy (XPS), in which BiOBr flakes were covalently linked with the assembled graphene sheets through the Bi–C bond. This composite exhibited remarkable visible light absorbance and efficient photoinduced charge splitting characteristics in comparison with those of pure BiOBr, as established by DRS absorption, photoluminescence radiation, and photocurrent study. Hence, a very small amount (5 mg) of the BiOBr@G composite displayed a complete photodegradation effect on the rhodamine B dye under only 15 min of visible light excitation, which was three times faster than that of pure BiOBr and extremely superior to that of commercial P25. This was probably ascribed to the well-defined BiOBr structure itself, elevated light absorbance, and Bi–C chemical bond inducing quick charge separation and transfer in the BiOBr@G composite. Additionally, investigations on the photocatalytic mechanism displayed that the photogenerated holes in the BiOBr valence band and derivative superoxide radicals played vital roles in the photodegradation of RhB dyes, as reinforced by the electron spin resonance method, where the covalent linking of BiOBr and graphene served as an effective pathway for charge transportation.
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PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2022
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IF 6.437
Shiyun Tang,Qiuyuan Xu,Kexin Liu,Junjiang Guo,Anjiang Tang
Coking with carbon deposition in hydrocarbon fuel (C x H y ) pyrolysis at high temperature is a serious problem to be considered. In this work, single component C x H y with different structures was used as the probe of the carbon deposition. Thirteen simple and representative of alkanes, cycloalkanes , aromatics and O-containing C x H y were selected as the model compounds to decompose and coking in microchannel continuous flow reactor under the same conditions. The distributions of gas, liquid and solid phase products formed by C x H y pyrolysis were characterized by GC, GC-MS, SEM and TPO-IR respectively. The results demonstrate that the molecular structure of C x H y has a great influence on pyrolysis and coking behavior. For all alkanes, CH 4 , C 2 H 4 , C 3 H 6 and C 4 H 8 are the most abundant in gaseous products, and their total content exceeds 70 %. For cycloalkanes, monocyclic cyclohexane pyrolysis tends to produce C 2 H 4 , C 4 H 8 and 1,3-C 4 H 6 , while bicyclic decahydronaphthalene pyrolysis tends to produce CH 4 , C 2 H 4 and C 3 H 6 . For aromatics, CH 4 and C 2 H 4 are the main products in the pyrolysis gas phase of benzene, toluene and ethylbenzene . Interestingly, in the liquid phase of the pyrolysis of O-containing C x H y (ethanol, acetone and tetrahydrofuran), most of the products are oxygenated compounds and no aromatics. SEM and TPO-IR revealed that at least three carbon species were formed by cracking of C x H y molecules with different structures, including amorphous, filamentous and granular carbon. However, due to the great and complex influence of C x H y molecular structure on the micro morphology of carbon deposition, it is difficult to classify all carbon species at present, which needs further experiments and researches.
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高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
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IF 1.134
Yan-Bing TAO,Jing HUANG,Yu-Nong ZHAO,Yan CHEN,Qing HUANG,Bo-Xiang SONG,Jian-Jun CHEN,Huan LIU
The electrochemical sensor fused with the principle of immunoassay can recognize the specific binding reaction of antigen and antibody, and transduce it directly into an electrical signal, realizing the rapid detection of relevant disease markers in the liquid sample. In this study, an electrochemical sensor for detecting eosinophil cationic protein (ECP), a marker of allergic rhinitis, was constructed based on a chemically modified electrode , and the surface of the carbon electrode was modified with semiconductor colloidal quantum dots (CQDs). Owing to the remarkable surface effect, size effect and unique quantum effect of CQDs, which can improve the enrichment of biomolecules and signal transduction on the surface of the carbon electrode, the lead sulfide (PbS) CQDs have good adhesion to the carbon electrode. On the basis of the ECP antibody coating and sealing treatment on the surface of the CQDs modified working electrode , the differential pulse voltammetry (DPV) was combined to significantly reduce the background current for electrochemical performance test, and then the quantitative detection of ECP antigen of different concentrations can be achieved. The detection time of the electrochemical sensor for ECP antigen was about 30 seconds, and the detection limit was 0.508 pg mL −1 . The electrochemical sensor has the characteristics of high sensitivity, convenience and non-invasiveness, showing the potential for early screening of diseases such as allergic rhinitis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ze Fang,Nan Li,Zhiguo Zhao,Zhexin Zhu,Wangyang Lu,Fengtao Chen,Junjie Wang,Wenxing Chen
Developing efficient and environmentally friendly catalytic system is significant for the removal of sulfide in fuel. O-bridged diiron perfluorophthalocyanine/4-mercaptopyridine (FePcF 16 -O-FePcF 16 /4-Mpy) as a novel composite catalyst was designed and prepared by axial coordination. The catalyst characterization was conducted through ultraviolet–visible spectroscopy, fourier transform infrared spectroscopy, X-ray diffractometry, electrospray ionization–mass spectrometry and density-functional theory technology. A high-efficient extraction oxidative desulfurization system is composed of hydrogen peroxide (H 2 O 2 ), the mixture of ethanol and water and FePcF 16 -O-FePcF 16 /4-Mpy. Notably, the coordination of 4-Mpy greatly enhanced the catalytic activity of FePcF 16 -O-FePcF 16 , 99.4% of the desulfurization rate was achieved in 20 min at 30 °C. The catalyst system was cycled 8 times without significantly reducing the removal of dibenzothiophene. Electron paramagnetic resonance and gas chromatography–mass spectroscopy proved the high-valent iron-oxo intermediates were the main active substances in the FePcF 16 -O-FePcF 16 /4-Mpy/H 2 O 2 system, and the pathway of catalytic oxidation DBT was proposed. This work provided useful insights to select suitable ligands to improve the activity of metal phthalocyanine, and offered a novel idea for the construction of efficient oxidative desulfurization system.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Yajie Wang,Zhiwei Guo,Yujie Yang,Yanxiang Li,Qingchun Guo,Peilin Cui,Wangliang Li
The magnetically responsive anti-fouling nanofiber membrane (MRANM) was fabricated for efficient oil-water emulsion separation, which could be cleaned using oscillating magnetic field. MRANM was prepared by grafting superparamagnetic Fe 3 O 4 nanoparticles onto the surface of electrospun polyacrylonitrile nanofiber membrane (PANM). Compared with PANM, the water contact angle of MRANM decreased from 104° to 0°, indicating that the hydrophilicity of the membrane was significantly improved. For the emulsions of hexadecane, octane and rapeseed oil, the separation efficiency was 98.04%, 96.59% and 92.67%, respectively. After the treatments in oscillating magnetic field, the separation efficiency kept above 95% after 8 times recycling, which indicated that the MRANM had good regenerability and reusability. The as-fabricated membrane with magnetic responsiveness facilitated an effective method for solving the membrane fouling problem during practical applications of separation high viscosity oil-water emulsion.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Weiwei Sui,Huawen Hu,Yinlei Lin,Peng Yi,Lei Miao,Haichen Zhang,Haiying He,Guangji Li
Stimuli-responsive materials with switchable wettability for bidirectional oil-water separation show great potential in practical applications. Inspired by mussels, we use dopamine as an anchor molecule to construct a polydopamine (PDA) coating on the surface of copper foam (CF). Silver particles are deposited on the PDA coated surface to construct a multiscale composite structure, and the long-chain alkylthiol with carboxyl and methyl groups at the end is subsequently self-assembled to the modified copper foam surface. The as-modified copper foam has unique pH responsiveness, that is, the water contact angle (WCA) is measured to be about 140° under acidic and neutral conditions, while alkaline conditions radically change the surface property from superhydrophobic to superhydrophilic due to the measured WCA turning to 0°. It can be used efficiently for the bidirectional separation of an oil-water mixture, e.g., the separation efficiency of a 1,2-dichloroethane/water mixture can reach as high as 98.2%. Besides, it maintains 98% separation efficiency and stable wettability for an octane/water mixture, together with excellent mechanical durability; the WCA of the surface maintains at about 130° after ten wear cycles.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wei Wei,Wen Chen,Xizhu Zhao,Zifan Yang,Yueli Liu
All-inorganic CsPbI 3 quantum dots perovskite solar cells (QDPSCs) have wide potential application due to their excellent photoelectric properties with high environmental stability. However, the poor interface contact between the light absorption layer and hole transport layer (HTL) results in the serious carrier recombination and the large open-circuit voltage ( V OC ) loss. Herein, we introduce the insulating PMMA (poly(methyl methacrylate)) buffer layer into CsPbI 3 quantum dots (QDs)/Cu 12 Sb 4 S 13 QDs HTL interface in all-inorganic QDPSCs with the structure of FTO/c-TiO 2 /m-TiO 2 /CsPbI 3 QDs/Cu 12 Sb 4 S 13 QDs/Au. The interface carrier recombination is obviously suppressed and the significant V OC improvement from 1.04 V to 1.14 V is obtained with the incorporated PMMA buffer layer. The devices with PMMA buffer layer show the enhanced power conversion efficiency (PCE) of 10.99%, and the improvement of 9.71% is achieved compared to that of the control devices (10.02%). The stability is significantly enhanced due to the intrinsic hydrophobic characteristic of PMMA, and the devices retain 62.69% of their initial PCE after stored in air condition for 15 days, which is greatly improved compared with the control device without PMMA.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Han Jia,Shaoyan Wang,Yingbiao Xu,Tingyi Wang,Lingyu Zhang,Jinyong Song,Xuehao Zhang,Lin Song,Haidong Jia,Hui Yan
Ionic liquids are regarded as the promising and efficient additives to use in various aspects of petroleum industry , especially in chemical EOR. In this investigation, three novel fatty acid ionic liquids (FAILs), methyltrioctylammonium octanoate ([N 8881 ][C 8:0 ]), methyltrioctylammonium laurate ([N 8881 ][C 12:0 ]) and methyltrioctylammonium palmitate ([N 8881 ][C 16:0 ]), were selected and evaluated for their performances in terms of surface/interfacial activity, temperature and salt resistances. The three FAILs could cause remarkable reduction of surface tension to ~30mN/m in their aqueous solutions, and the [N 8881 ][C 8:0 ] with the shortest anionic alkane chain exhibited the greatest surface activity among three FAILs. Then the size-match effect and intermolecular interaction were employed to explain the abnormal variations, which were confirmed by the control experiments using mixed surfactants and the molecular dynamics simulation . It was found that the binding energy in [N 8881 ][C 8:0 ] (−28.961 kcal/mol) was larger than that in [N 8881 ][C 16:0 ] (−22.942 kcal/mol), which should be responsible for their different surface activity. Moreover, the crude oil/water interfacial tension (IFT) could be decreased to the much level (4.9 ×10 −3 mN/m and 1.7 × 10 −2 mN/m) even at high-temperature conditions (80 °C) and at high-salinity conditions (100,000 mg/L), indicating the FAILs might be the ideal candidate for the EOR used surfactants with great temperature and salt tolerances. Meanwhile, the variations of IFT results further verified our proposed mechanism.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Yingbiao Xu,Jinyong Song,Tingyi Wang,Mingming Xu,Lingyu Zhang,Haidong Jia,Jianan Wang,Lin Song,Han Jia,Peng Lian
The effects of carboxylate group positions in terephthalic acid (TA) and phthalic acid (PA) on the self-assembly behaviors of cationic surfactant dodecyl trimethyl ammonium bromide (DTAB) have been investigated by interfacial tension (IFT) measurement and molecular dynamics (MD) simulation in this study. The IFT results reveal the added PA improves the interfacial activity of DTAB more effectively than TA at acid/NaOH molar ratio of 1:2. The number density profiles in MD simulation systems are calculated to confirm the high interfacial adsorption in DTAB/PA 2− system. Interaction energy calculation and molecular electrostatic potential analysis demonstrate the ortho -position distribution of carboxylate groups enhance the electrostatic potential more obviously, which results in the more stable gemini-like self-assembly configurations in DTAB/PA 2− system. Spatial distribution function calculation and reduce density gradient method are employed to further visualize the intermolecular interaction between DTAB and acid molecules. The present study provides the visual insights into the effects of functional group positions in acids on their self-assembly behaviors and intermolecular interaction with cationic surfactant.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
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IF 4.759
Ruijuan Duan,Meiling Qi
This work presents the investigation of using the amphiphilic triblock copolymer composed of poly(ethylene oxide)(PEO)-poly(propylene oxide) (PPO)-poly(ethylene oxide) (PEO) (denoted as EPE) as the stationary phase for gas chromatographic (GC) analyses . The EPE capillary column exhibited moderate polarity and column efficiency of 4348 plates/m determined by naphthalene at 120 °C ( k = 11.52) . Different from the PEG and polysiloxane homopolymers, it showed high-resolution performance towards a wide range of aliphatic and aromatic isomers in terms of polarity and acid-base properties. Particularly, the EPE column displayed distinct advantages for separating the critical isomers of alkanes, anilines and phenols and the components of the lemon essential oil over the commercial PEG and polysiloxane columns. In addition, the EPE column exhibited excellent separation repeatability and reproducibility with the relative standard deviation (RSD) values in the range of 0.03% – 0.08% for run-to-run, 0.14% – 0.61% for day-to-day and 3.1% – 4.0% for column-to-column, respectively. Moreover, the EPE column was investigated in terms of thermal stability, the minimum allowable operating temperature (MiAOT) and sample loadability. Its application to GC-MS analysis of the essential oil demonstrated its feasibility for practical analyses. This work demonstrates the promising future of triblock copolymers as a new class of selective stationary phases for GC analyses, which is barely reported up to date. The findings of this work is of important value for fundamental researches and practical applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 23
·10502-10509
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IF 3.591
Chenhua Shu,Xunzheng Liu,Wenjing Xie,Shuiping Cai,Wenting Li,Mengjiao Wang
In order to improve the desulfurization rate, deep eutectic solvents (DESs) were used for the first time as solvents in the reductive desulfurization process with nickel boride (NB). DES plays a dual role of stabilizer and extracting agent in the desulfurization process. NBs prepared in different solvents were characterized by PSZPA, SAPA, XRD and FTIR spectroscopy. Results indicate that the NBs with small particle size and high specific surface area can be obtained by using DES as the solvent. The desulfurization rate of aromatic sulfides using DESs as the solvent is much higher than that using MeOH/THF as the solvent. The desulfurization rate in different DESs follows the order of tetrabutyl ammonium chloride (TBAC)/polyethylene glycol > TBAC/ethylene glycol > TBAC/glycerol. No chemical reactiong takes place between NB and DESs, and the structures of the DESs remain unchanged after regeneration.
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高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jing Cao,An Li,Yicen Zhang,Linchao Mu,Xi Huang,Yankun Li,Tao Yang,Cen Zhang,Congshan Zhou
To prepare catalyst with high activity, high selectivity and good stability remains the biggest challenge in the hydrodeoxygenation (HDO) of phenols by adopting MoS 2 -based sulfides as catalysts. Herein, we report a simple hydrothermal method to synthesize highly-dispersed nano-MoS 2 with abundant defects and some curved slabs. All these advantages enable nano-MoS 2 to provide a large number of coordination unsaturated sites to anchor Co atoms. The unsupported Co-doped catalyst with an optimal Co/(Co + Mo) molar ratio of 0.3 exhibited excellent performance in the HDO of p -cresol with conversion of 98.7 % and toluene selectivity of 98.9 % at 220 °C. Moreover, the optimized Co/MoS 2 -0.3 catalyst had a good stability after reaction of 72 h. The excellent HDO performance was attributed to the formation of abundant Co-Mo-S active sites which optimize the electrical structure of nano-MoS 2 by Co promoter.
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高影响因子
危险品化学品经营许可证（带存储）