Journal of Cleaner Production
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2019
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IF 6.395
Xiaoxiao Qian,Zhi Chen,Xiuru Yang,Wan Zhao,Chunxi Liu,Tao Sun,Dantong Zhou,Qian Yang,Guoying Wei,Meiqiang Fan
The efficient removal of antibiotic residues has drawn wide interests; however, little attention has been focused on treating them in organic system. Inorganic perovskite cesium lead bromide quantum dots were successfully prepared by anti-solvent precipitation and the prepared cesium lead bromide quantum dots were well-characterized. The photocatalytic activity was evaluated by degradation of tetracycline hydrochloride in ethanol as a model reactant under visible light for the first time. 76% tetracycline hydrochloride and 70% methyl orange were efficiently degraded in 30 min, which illustrate cesium lead bromide quantum dots could work as efficient photocatalyst for the degradation of organic pollutants in ethanol. The photoelectric conversion efficiency and photoluminescence quantum yields were measured and calculated. The photodegradation process was systematically analyzed by full-wavelength absorption. It is found that superoxide radicals may play a major role in the photocatalytic degradation process by capture experiments and the reaction mechanism has been proposed. Cesium lead bromide is not stable in water and may be converted into perovskite-related phase with water, which will result in the loss of photocatalytic activity. This work indicates that cesium lead bromide may act as an efficient photocatalyst for the removal of tetracycline hydrochloride and methyl orange in organic system, which may benefit the development/application of novel photocatalysts for special applications.
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TALANTA
·
2019
·
IF 4.916
Shengrui Xu,Qingqing Liu,Cuicui Wang,Li Xiao,Suling Feng,Ning Li,Chang-Po Chen
In this study, facile fabrication of three-dimensional (3D) pompon-like gold/zinc oxide (Au/ZnO) porous microspheres by hydrothermal procedure was investigated. These microspheres were utilized as solid phase microextraction (SPME) coating for determination of volatile fatty acids (VFAs) from foot odor coupling with gas chromatography-mass spectrometry (GC-MS). SEM and TEM characterizations showed that as-prepared material was composed of 1D porous nanowires and presented a uniform coating on stainless-steel wire. The extraction of VFAs including propanoic acid, butyric acid , isobutanoic acid, isovaleric acid , hexanoic acid , and heptylic acid was carried out by headspace model after sampling from human foot using cotton wool strips. Following optimization of extraction parameters including extraction temperature and time and desorption temperature and time, the as-prepared SPME coating presented better extraction efficiency than commercial DVB/CAR/PDMS fiber towards all the VFAs due to its excellent properties. Under the optimized conditions, the method exhibited good linearity (0.5–200 ng) with regression coefficients (R 2 ) ranging from 0.9836 to 0.9981 for all the analytes. The limits of detection ranged from 0.017 to 0.098 ng. Single fiber repeatability varied from 6.5% to 11.2% and the fiber-to-fiber reproducibility ranged from 8.6% to 12.3%. The proposed method was successfully applied for extraction and determination of VFAs from foot odor after sampling using cotton wool strips.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2019
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IF 4.191
Yunchang Fan,Zeyu Niu,Chen Xu,Lei Yang,Feiyang Chen,He Zhang
Haematococcus pluvialis , a green microalga, can accumulate high level of astaxanthin which is regarded as a super antioxidant extensively used in cosmetics, poultry, food, and pharmaceutical industries. The difficult point for extraction of astaxanthin is how to break the thick resistant cell walls of Haematococcus pluvialis effectively. In this work, this difficulty was successfully solved by the biocompatible protic ionic liquids-based microwave-assisted liquid-solid extraction (PILs-MALSE). Ethanolammonium caproate (EAC), a PIL used in here, can strongly dissolve mannan, one of the main components of the cell walls of Haematococcus pluvialis , which can leave out the pretreatment process to disrupt the cell walls before extraction, thereby leading to fast extraction (extraction time, 50 s). Furthermore, EAC has the obvious advantages over the imidazolium-based ILs, such as low cost, easy synthesis, and excellent biocompatibility. The PILs-MALSE method is more effective for the extraction of astaxanthin compared with conventional extraction techniques.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2019
·Vol. 29
·期 24
·1900991
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IF 15.621
Keqiang Chen,Qiaohui Zhong,Wen Chen,Binghua Sang,Yingwei Wang,Tingqiang Yang,Yueli Liu,Yupeng Zhang,Han Zhang
Cubic phase CsPbI 3 (α-CsPbI 3 ) perovskite quantum dots (QDs) have received extensive attention due to their all-inorganic composition and suitable band gap (1.73 eV). However, α-CsPbI 3 QDs might convert to δ-CsPbI 3 (orthorhombic phase with indirect band gap of 2.82 eV) due to easy loss of surface ligands. In addition, commonly used long-chain ligands (oleic acid, OA, and oleylamine, OLA) hinder efficient charge transport in optoelectronic devices. In order to relieve these drawbacks, OA, OLA, octanoic acid, and octylamine are used as capping ligands for synthesizing high-quality α-CsPbI 3 QDs. The results indicate that these QDs exhibit excellent optical properties and long-term stability compared to QDs capped only with OA and OLA. Moreover, QDs with shorter ligands exhibit an enhanced charge transport rate, which improves the power conversion efficiency of photovoltaic devices from 7.76% to 11.87%.
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高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Qian Zeng,Zhen Song,Hao Qin,Hongye Cheng,Lifang Chen,Ming Pan,Yi Heng,Zhiwen Qi
Butyl hexanoate (BuHE) is currently synthesized through the Fischer esterification with mineral acid as catalyst, which suffers from the problems of side reaction, difficult recycling, and corrosion. To overcome these disadvantages, ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIm][HSO 4 ]) is employed as dual catalyst-solvent for the esterification of hexanoic acid (HeAc) with n-butanol (BuOH) in a reactive extraction process. The dual functions of [BMIm][HSO 4 ], extraction and catalysis, were confirmed by liquid-liquid equilibria for the two systems {[BMIm][HSO 4 ] + HeAc + BuHE} and {[BMIm][HSO 4 ] + BuOH + BuHE}, and by the comparison of esterifications with or without [BMIm][HSO 4 ], respectively. Moreover, the optimal reactive extraction conditions for BuHE formation were obtained. Finally, the possible mechanism of intensification of [BMIm][HSO 4 ] on BuHE formation in reactive extraction process was proposed.
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高影响因子
ACS Applied Nano Materials
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2019
·
IF 0
Qin Dai,He Zhao,Hongbin Cao,Yiqiu Wu,Zhi Sun,Xiaofei Meng,Tianyu Wang,Guangfei Yu,Jingyi Lin,Rong Hou
The green and low-cost preparation of carbon dots (CDs) with excellent fluorescence plays a key role in cell-imaging applications. Herein, we develop a green photochemical approach for fabricating CDs. The produced CDs can be used directly in lung cancer A549 cell imaging without any tedious post-treatments. As nontoxic and green alternatives to prevent pollution, fatty acids in sole aqueous media are the only reactants used to synthesize CDs. Furthermore, the green process of photoirradiation avoids harsh conditions, such as strong acids and bases, strong oxidants, and high temperatures and pressures. In addition, the by-products remaining in the aqueous environment are fatty acid dimers in the form of vesicles, which can also be recycled as gemini surfactant resources. We demonstrate that this green synthetic method for fabricating CDs is suitable for fatty acids with different chain lengths, and therefore, exhibits considerable universality. Fatty acids, as readily available green resources in nature, and the green and simple synthesis method without additional pollution provides a new approach and perspective for the green synthesis of CDs for bioimaging.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 35
·20317-20324
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IF 10.733
Hongjian Wang,Long Chen,Hao Yang,Meidi Wang,Leixin Yang,Haiyan Du,Chenliang Cao,Yanxiong Ren,Yingzhen Wu,Fusheng Pan,Zhongyi Jiang
Covalent organic frameworks (COFs) hold great promise in molecular separation. However, since the aperture size of most COFs is in the range of 0.8–4.9 nm, constructing COF membranes with a smaller aperture size is thus in urgent demand yet remains a grand challenge. In this study, a Brønsted acid mediated one-step self-assembly method for the fabrication of COF membranes is proposed by segregating the organic phase (containing Brønsted acids and aldehydes) from the aqueous phase (containing amines) with a polymeric support and implementing an interfacial polymerization reaction thereby. Brønsted acids, serving as a versatile mediator, can facilitate the amorphous-to-crystalline transformation, ensure the confined membrane growth at the interface and regulate the assembly behavior of COF subunits, and thus play a critical role in manipulating the microstructure evolution of COF-JLU2 membranes. More intriguingly, a correlation among membrane structures, separation performance and the partition coefficient (log P) of Brønsted acids was established. When log P lies in between 1.0 and 3.0, the COF membranes with continuous active layers, tunable thickness (50–400 nm) and small aperture size (0.49–0.51 nm) can be fabricated, achieving superior alcohol dehydration performances to all the reported membrane counterparts. Our findings may stimulate further research on bottom-up construction of COF membranes and other kinds of organic framework membranes (XOF membranes).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Lihua Zhou,Yang He,Shaohua Gou,Qin Zhang,Ling Liu,Lan Tang,Xianzhi Zhou,Ming Duan
Currently, it remains a great challenge to maintain clay stability in water and prevent shear dispersion of the clay lamellae. Herein, a series of piperazine-based polyether Gemini quaternary ammonium salts (QAs) with different alkyl chains and linker groups were synthesized as the novel intercalator candidates. We established the correlations between their structures and inhibition swelling behavior of montmorillonite (MMT), a representatively hydratable and expansive clay. Upon loading saturated QAs, the lateral bilayer intercalation aligning parallelly to lamella surface was validated by X-ray diffraction (XRD), namely a monolayer adsorption on MMT platelets, agreeing well with Langmuir isotherm model. By combining Fourier transform infrared (FT-IR) spectroscopy and zeta potential, electrostatic attraction and hydrogen bonding were confirmed as the crucial multiple driving forces of adsorption and intercalation. The increased water contact angles (WCAs) demonstrated the formation of protective coating for hindering the entrance of water into the interlayers of MMT. XRD and field emission scanning electron microscope (FE-SEM) indicated that, when the carbon number of “tail” groups in QAs molecules was greater than 12, the platelets of organo-MMT (OMMT) were prone to be exfoliated and aggregated parallelly to sheet surface. This study provides a unique foundation for designing the molecular structure of clay modifier.
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高影响因子
JOURNAL OF CATALYSIS
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2018
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IF 6.759
Shao-Hong Guo,Jie Zhou,Xue Zhao,Chun-Yi Sun,Si-Qi You,Xin-Long Wang,Zhong-Min Su
Development of efficient, selective and low-cost photocatalysts, ideally constructed from Earth-abundant elements, is still a big challenge for CO 2 photoreduction. Herein, adopting mixed halides strategy, the activity of all-inorganic perovskites toward CO 2 reduction is enhanced sharply under simulated sunlight without photosensitizer, meanwhile maintaining high selectivity of CO and CH 4 production. Via regulating ratio of Br and Cl, the yield of CO and CH 4 changes obviously and the optimized catalyst is CsPb(Br 0.5 /Cl 0.5 ) 3 with a total yield of CO and CH 4 up to 875 μmol/g (selectivity of 99%) which outperforms any other reported halide perovskites and is 4.5 and 9.1 folds higher than that of CsPbBr 3 and CsPbCl 3 under the same condition. The efficient charge separation and moderate stability in mixed-halide perovskites may account for the excellent performance in CO 2 reduction. This study may provide a new strategy in design of high performance and low-cost halide perovskite materials for photocatalysis.
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RSC Advances
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2014
·Vol. 4
·期 109
·63977-63984
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IF 3.708
Hui Gao,Wenqi Niu,Yan Hong,Beibei Xu,Chengyin Shen,Chaoqun Huang,Haihe Jiang,Yannan Chu
A novel negative photoionization chloride ion attachment ion mobility spectrometry (NP-CA-IMS) instrument has been developed. In this technique, chloride ion attachment technology is first applied to photoionization ion mobility spectrometry in a negative detection mode. The reactant ions are chloride ions, which are generated from the reaction between carbon tetrachloride (CCl4) and low energy electrons induced by the photoionization of acetone (CH3COCH3) with a commercial vacuum ultraviolet Krypton lamp. The generation efficiency of chloride ions was investigated. Subsequently, the performance of the instrument was investigated. A series of volatile straight chain organic carboxylic acids were detected in the order of magnitude of ppb, including acetic acid (CH3COOH), propionate acid (CH3CH2COOH), butyric acid (CH3(CH2)2COOH), valeric acid (CH3(CH2)3COOH), isovaleric acid (2-CH3(CH2)3COOH), hexanoic acid (CH3(CH2)4COOH), heptanoic acid (CH3(CH2)5COOH), and octanoic acid (CH3(CH2)6COOH). Besides, the concentration of acetic acid was calibrated and a mixture of the investigated acids was also studied. Finally, the new method's capability to detect acetic acid in five different brands of edible white vinegar was evaluated. The experimental results show that negative photoionization chloride ion attachment is an excellent nonradioactive source for IMS.
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高影响因子
ANALYTICAL CHEMISTRY
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2015
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IF 5.636
Jialiang Pan,Shu Jia,Gongke Li,Yuling Hu
Microporous organic polymers (MOPs) are an emerging class of functional porous materials for diverse potential applications. Typically, tailored microporous structures of MOPs are generated by linkages of organic polymerizable monomer building blocks, providing high permanent porosity and excellent stability. Herein, we reported the first example of the application of organic building block based MOPs (OBB-MOPs) as efficient enrichment media for sample preparation. A novel multilayer interbridging strategy was proposed to fabricate OBB-MOP coatings, and hereby SNW-1 (a kind of OBB-MOPs) was coated on silica substrate with well-controlled thickness. Strong covalent bonds throughout the network and interlayer bridging improved the durability of the coating significantly. Outstanding chemical stability was observed in diverse solvents as well as solutions with a wide range of pH or high ionic strength and even under extremely harsh conditions like boiling water. The SNW-1 coating possessed a microporous network structure constructed of conjugated and nitrogen-rich building blocks. Thus, the coating exhibited a superior enrichment performance of polycyclic aromatic hydrocarbons and volatile fatty acids (VFAs) over commercial coatings based on interactions including π–π affinity and acid–base interaction. For further application, this coating was combined with gas chromatography/mass spectrometry for the noninvasive analysis of VFAs from tea leaf and tobacco shred samples. The low detection limits of 0.014–0.026 μg/L were achieved with the relative standard deviations (RSDs) between 4.3 and 9.0%. Consequently, trace original VFAs from the samples were detected. Good recoveries were obtained in the range of 90–129% and 77–118% with the corresponding RSDs (n = 3) of 2.6–9.3% and 1.9–10%, respectively.
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PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2013
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IF 2.915
Hong-De Yan,Qun Zhang,Zhao Wang
A lipase from Aspergillus oryzae WZ007 exhibited high esterification activities toward a series of short-chain acids and alcohols. Moreover, it displayed a strong tolerance for high substrate concentration of up to 2.0 M and presented a highest initial rate of 276 mmol·L − 1 ·h − 1 at this concentration. After a reaction time of 48 h, the conversion rates of acids were higher than 80% for the synthesis of a majority of heptanoic acid esters, some octanoic acid esters and n -propyl hexanoate. These results implied that A. oryzae WZ007 lipase was a promising biocatalyst in the production of flavor esters.
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高影响因子
危险品化学品经营许可证（带存储）