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Influence of kaolinite and montmorillonite on benzo[a]pyrene biodegradation by Paracoccus aminovorans HPD-2 and the underlying interface interaction mechanisms

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Pedosphere 2022年第2期32卷 246-255页

作者： Xinhong GAN Ying TENG Jian XU Ning ZHANG Wenjie REN Ling ZHAO Peter CHRISTIE Yongming LUO Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental ScienceMinistry of Ecology and Environment(MEE)of ChinaNanjing 210042China University of Chinese Academy of Sciences Beijing 100049China

Clay minerals play an important role in biogeochemical ***,kaolinite and montmorillonite,the two most abundant and widespread clay minerals with typical layered structures,were selected to investigate and compare their effects on the biodegradation of benzo[a]pyrene(BaP)by Paracoccus aminovorans HPD-2 and to investigate the underlying interface ***,the BaP degradation efficiency was significantly higher 7 d after montmorillonite addition,reaching 68.9%(Ppolycyclic aromatic hydrocarbon *** observations improve our understanding of the mechanisms by which clay minerals,organic pollutants,and degrading bacteria interact during the biodegradation process and provide a theoretical basis for increasing the biodegradation of soil pollutants by native microorganisms under field conditions.

关键词： bio-accessibility cell viability clay mineral degrading bacteria nano-scale secondary ion mass spectrometry polycyclic aromatic hydrocarbon

PDMS Rod-SBSE System Coupled with Gas Chromatography for Determination of PAHs in Aqueous Samples

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Chemical Research in Chinese Universities 2011年第5期27卷 742-745页

作者： CHENG Chuan-xian PEI Hai-rong LAN Xiao-zheng College of Chemistry and Material Science Shandong Agricultural University Tai ＇an 2 71018 P. R. China

A method for the analysis of trace polycyclic aromatic hydrocarbons（PAHs） in aqueous samples has been established by polydimethylsiloxane（PDMS） rod aided stir bar sorptive extraction（SBSE）. The homemade PDMS rod has a size of 30 mm×3 mm o.d. with a volume of ca. 200 μL, stable in thermal desorption process. The enriched PAHs by the PDMS rod were released in a homemade thermal desorption system coupled with gas chromatography. Experimental parameters for extraction of six PAHs were optimized including extraction time, pH, ionic strength and temperature of solution. The procedure has good recoveries of 80.0%―100.3% and very low limits of detection of 4.0―33 ng/L. PAHs in rain and river water were analyzed by this method.

关键词： Polydimethylsiloxane(PDMS) rod Stir bar sorptive extraction(SBSE) polycyclic aromatic hydrocarbon

Impact of drilling waste pollution on land cover in a high subarctic forest-tundra zone

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Pedosphere 2022年第3期32卷 414-425页

作者： Anatoly OPEKUNOV Marina OPEKUNOVA Stepan KUKUSHKIN Sergey LISENKOV Institute of Earth Sciences St.Petersburg State UniversitySt.Petersburg 199178(Russia)

Global climate changes can lead to the destruction of the permafrost zone and contribute to the active transfer of pollutants to natural *** can be especially pronounced in the areas of oil and gas production in the *** study aimed to define the landscape components(i.e.,groundwater,soil water,soil,and indicator plant species)of chemical pollution with metals,oil hydrocarbons,and polycyclic aromatic hydrocarbons,from the discharge of drill *** at two sites in the forest-tundra zone of Western Siberia(Russia)were carried out within two years of *** migration was found in peaty-gley heavy loamy soils and iron-illuvial clayey podburs,but lateral migration of different pollutants did not exceed 200 ***,radial migration was practically absent owing to the high buffering capacity of the soil organic horizon and the upward flow of matter in the seasonal melt *** main indicators of drilling waste pollution were high concentrations of Sr,Ba,petroleum hydrocarbons,and Cl^(-)*** the waste disposal sites,the concentration of Ba and Sr in the soil water were 1150 and 1410μg L^(-1),respectively;in groundwater,they reached 721 and 2360μg L^(-1),*** the soil,Ba and Sr accumulated in the peaty horizon(798 and 706 mg kg^(-1),respectively).The concentration of Cl^(-)ions in the soil water at the site of waste discharge was 1912 mg L^(-1),and at a distance of 200 m,it decreased to 77.4 mg L^(-1).The Cl^(-)concentration in the groundwater was lower,and at a distance of 200 m,it was 38.9 mg L^(-1).The highest concentration of petroleum hydrocarbons in the surface layer was found in the peaty-gley soils(up to 2400 mg kg^(-1)).In glandular-illuvial podburs,it was 420 mg kg^(-1).In horizons BH and BC,it was close to the background values(27 and 33 mg kg^(-1),respectively).Alkalinization of soils and water under the influence of drill cuttings led to the death of oligotrophic and acidophilic vegetation at a distanc

关键词： metal petroleum hydrocarbons plant indicator species pollutant migration in soil polycyclic aromatic hydrocarbon

Facile synthesis and functionalization of fluoranthenes via intramolecular[4+2]annulations between thiophenes and alkynes

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Chinese Chemical Letters 2023年第6期34卷 476-479页

作者： Shoudong Xie Weinan Chen Si Liu Hao Zong Binbin Ming Gang Zhou Lab of Advanced Materials State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200438China

Fluoranthenes have attracted tremendous attention due to their unique optoelectronic properties and extensive *** several synthetic methodologies have been developed for the preparation of fluoranthene derivatives,it is still unfavorable to functionalize the fluoranthene framework at different positions due to the relatively low selectivity and ***,a catalyst-free intramolecular[4+2]annulation between thiophenes and alkynes is developed towards the synthesis of *** 20 examples have been demonstrated using this *** functional groups can be precisely introduced into the fluoranthene skeleton at different positions by simply tuning the substituents on the thiophenes and *** conjugation of the fluoranthene can be facilely extended through different ***,the feasibility of this[4+2]annulation reaction is also investigated by density functional theory ***,this protocol provides not only a synthetic methodology towards fluoranthenes with substituents functionalized at different positions,but also an effective pathway to construct large polycyclic aromatic hydrocarbons containing fluoranthene moieties.

关键词： Fluoranthene Annulation polycyclic aromatic hydrocarbon Catalyst-free S-extrusion

Effects of PAHs on Biotransformation Enzymatic Activities in Fish

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Chemical Research in Chinese Universities 2011年第3期27卷 413-416页

作者： LU Guang-hua CHEN Wei LI Ying ZHU Zhi Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing 210098 P. R. China

Biotransformation and detoxification responses to the exposure to five polycyclic aromatic hydrocarbons were investigated in crucian（Carassius auratus）. Juvenile crucian were treated with a single intraperitoneal injection of each compound at dosages of 0.1, 1.0, 2.0, 5.0 and 8.0（or 10.0） mg/kg and sacrificed 15 d later to determine 7-ethoxyresorufin-O-deethylase（EROD） and glutathione S-transferases（GST） activities in gill S9 fractions. EROD activity is significantly increased by benzo（b）fluoranthene and indeno（1,2,3-cd）pyrene at all the doses. High dosages of PAHs induced GST activity and the inducing ability of them increased in the following order： fluorene fluorantheneindeno（1,2,3-cd）pyrenebenzo（g,h,i）perylenebenzo（b）fluoranthene. In all the cases, dose dependence appeared to exist. The gill EROD and GST in Carassius auratus are useful biomarkers to estimate sub-acute toxicity of both polycyclic aromatic hydrocarbons（PAHs） and PAHs-like compounds.

关键词： polycyclic aromatic hydrocarbon Gill 7-Ethoxyresorufin-O-deethylase activity Glutathione S-transferases activity

A step towards the application of molecular plasmonic-like excitations of PAH derivatives in organic electrochromics

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Chinese Chemical Letters 2023年第2期34卷 174-178页

作者： Yanan Zhu Xing Xing Zhenguo Liu Hong Meng School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China Shenzhen Research Institute of Northwestern Polytechnical University Shenzhen 518057China Institute of Flexible Electronics Northwestern Polytechnical UniversityXi'an 710072China

polycyclic aromatic hydrocarbons(PAHs), are regarded as molecular fragments of graphene and are facilely available through chemical synthesis. Recently, it is found collective charge density oscillations with strong induced electromagnetic field display in PAH derivatives. This phenomenon, analogue to plasmonic excitation in metal, called molecular plasmonics, arise the significant interest of physicists. Instead of discussing its rich physics, this work aims at the application of molecular plasmon-like excitations in electrochromics and optoelectronics. We found that the energy and the intensity of plasmonic-like oscillation could be largely tuned by increasing the conjugation size along both the longitude/transverse axis in PAHs. Besides, the dimeric PAH demonstrates the possibility that molecular plasmonics could be designed using PAHs as building blocks for integration into larger molecular systems. Moreover, this work straightforwardly extends the molecular plasmonic-like property from C–H composed PAHs to much more versatile planar conjugation systems with heteroatoms, achieving transferring between p-type and n-type organic semiconductors. Therefore, with the natural abundance, low cost, easily chemical synthesis of PAH derivatives, we believe this work paves the way for the application of molecular plasmonic-like properties in optoelectronics.

关键词： Molecular plasmonic Organic electrochromics polycyclic aromatic hydrocarbon p/n-type organic semiconductor

A fan-shaped synthetic chiral nanographene

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Chinese Chemical Letters 2023年第2期34卷 154-157页

作者： Haonan Shi Bangyuan Xiong Ying Chen Chaojun Lin Jiajian Gu Yanpeng Zhu Jiaobing Wang School of Chemistry Sun Yat-sen UniversityGuangzhou 510275China

We report the synthesis and characterization of a fan-shaped chiral nanographene 1,which is composed of 6 hexabenzocoronene subunits with 216 conjugated carbon *** the dehydrocyclization reaction,38 C–C bonds are formed simultaneously.1 exhibits strong panchromatic absorption from the ultraviolet to the near-infrared,with an absorption coefficient of 209,000 L mol^(-1)cm^(-1)at 564 *** pure samples,obtained via chiral HPLC,show distinct ECD signals(|Δε|=704 L mol^(-1)cm^(-1)at 405 nm).Upon excitation,1 emits near-infrared fluorescence at 820 nm with a quantum yield of 5.5%.These photophysical properties of 1 were analyzed with the assistance of DFT calculations.

关键词： Nanographene Molecular nanocarbon Chirality polycyclic aromatic hydrocarbon Helicene

Facile Synthesis of Aryl-Substituted Cycloarenes via Bismuth(III)Triflate-Catalyzed Cyclization of Vinyl Ethers

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CCS Chemistry 2021年第5期3卷 1445-1452页

作者： Wei Fan Yi Han Shaoqiang Dong Guangwu Li Xuefeng Lu Jishan Wu Department of Chemistry National University of SingaporeSingapore 117543 Department of Materials Science Fudan UniversityShanghai 200438 Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207

Cycloarenes are an essential class of polycyclic aromatic hydrocarbons with unique electronic structure,but their synthesis is very ***,we report a facile synthetic strategy primarily involving macrocyclization by the Suzuki coupling reaction,followed by bismuth(III)triflate-catalyzed cyclization of vinyl *** utilizing this approach,aryl-substituted soluble cycloarenes 7 and 8 with different sizes were obtained.X-ray crystallographic analysis revealed a slightly distorted backbone in the kekulene derivative 7 and a saddle-shaped skeleton in the octulene derivative *** length analysis suggested that both of the cycloarenes mainly complied with the Clar’s bonding model with dominant local aromaticity,which was also in accord with our NMR measurements and the theoretical calculations[nucleus-independent chemical shift[NICS],anisotropy of the induced current density(ACID),three-dimensional isochemical shielding surface(3D ICSS)].The optical properties were investigated by UV-Vis absorption and fluorescence spectral *** method opens opportunities to access various expanded and core-modified cycloarenes in the future.

关键词： polycyclic aromatic hydrocarbon cycloarene kekulene octulene aromaticity

Numerical Analysis on the Characteristics of Soot Particles in C2H4/CO2/O2/N2 Combustion

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Chinese Journal of Chemical Engineering 2013年第3期21卷 238-245页

作者：李山岭蒋勇陈文婷 University of Science and Technology of China State Key laboratory of Fire Science Hefei 230026 China

The purpose of this study is to investigate the characteristics of soot particles in C2H4/CO2/O2/N2 com- bustion at equivalence ratio of 3.0-5.0. As the oxidant is switched from conventional air to CO2/O2/N2 mixture, the key species C2H2, C3H3 responsible for formation of first aromatic ring, the apical aromatics and 4zring aromatics total production rate all decrease greatly. In addition, with CO2 mole fraction from 0.2 to 0.5 in the mixture, the soot particle number density, volume fraction, surface area density, which are three most important parameters to soot oarticle orooertv, are suooressed obviously. Furthermore, the increasing content of C02 in the oxidizer influences mostly H, OH radical concentrations by two reactins CO ＋ OH == CO2＋ H and H ＋ O2===O＋ OH, and the procluction rate ofvo reactions declined, which revealed that C02 in mixture has an inhibiting ef- fect on soot particle generation.

关键词： O2/CO2-combustion soot particle polycyclic aromatic hydrocarbon production rate