Article
Environmental Sciences
Jeong Weon Choi, Munhee Kim, Geurim Song, Younglim Kho, Kyungho Choi, Mi-Yeon Shin, Sungkyoon Kim
Summary: In this study, the absorption, distribution, metabolism, and excretion of polycyclic aromatic hydrocarbons (PAHs) in humans were investigated. It was found that all the PAHs were rapidly absorbed and excreted in urine within a short period of time. The fractional urinary excretion of PAH metabolites ranged from 0.07% to 11.3%, with a half-life of 3.4 to 11.0 hours. Two-compartment models successfully described the toxicokinetic characteristics of each PAH.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Kartik Dhar, Sudharsanam Abinandan, Tanmoy Sana, Kadiyala Venkateswarlu, Mallavarapu Megharaj
Summary: Our study examined the anaerobic microbial degradation of hazardous polycyclic aromatic hydrocarbons (PAHs) and found that sulfate-reducing bacteria (SRB) in contaminated freshwater sediments can effectively degrade three-ringed phenanthrene and highly recalcitrant four-ringed pyrene. Desulfovibrio was the dominant bacterium in the phenanthrene-degrading culture, while Rhodopseudomonas was a significant member in the pyrene-degrading culture. This research indicates that SRB could play a crucial role in the natural attenuation of PAHs in oxygen-depleted freshwater sediments.
ENVIRONMENTAL RESEARCH
(2023)
Article
Ecology
Kartik Dhar, Logeshwaran Panneerselvan, Suresh R. Subashchandrabose, Kadiyala Venkateswarlu, Mallavarapu Megharaj
Summary: This study reports on the enrichment culture of Desulfotomaculum, which plays a key role in the anaerobic degradation of PAHs, under completely anaerobic sulfate-reducing conditions.
Article
Environmental Sciences
Zhen-Zong Bao, Si-Qi Lu, Guangzhao Wang, Zongwei Cai, Zhi-Feng Chen
Summary: This study investigated the adsorption mechanism of 2-hydroxynaphthalene (2-OHN), naphthalene (NAP), phenanthrene (PHE), and pyrene (PYR) by polyvinyl chloride microplastics (PVC-MPs) using adsorption/desorption experiments and theoretical calculations. The adsorption onto active sites of PVC-MPs was found to be the rate-limiting step, and the adsorption isotherms were well described by the Freundlich model. The release of 2-OHN from PVC-MPs into the simulated gastrointestinal environment was higher than that of NAP.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Pingting Liu, Kaisheng Wang, Ling Xu, Yutao Rao, Mingbo Zhou, Atsuhiro Osuka, Jianxin Song
Summary: Naphthalene- and phenanthrene-fused [22]smaragdyrin BF2-complexes and the corresponding antiaromatic [20]smaragdyrin free bases were successfully synthesized through a series of reactions. The introduced fused structures altered the aromatic and antiaromatic properties of these compounds.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Microbiology
Ziyan Zhou, Yanqin Wang, Mingxia Wang, Zhifeng Zhou
Summary: The study enriched a microbial consortium capable of degrading phenanthrene under methanogenesis from paddy soil. Glucose addition increased the production rate of CH4 but did not affect phenanthrene degradation. The abundance of genes related to aromatic compound degradation decreased with glucose addition, while genes related to CH4 synthesis were unaffected. Additionally, the acetate pathway was found to be dominant in the phenanthrene-degrading system, indicating the potential for a multistage pattern to enhance PAH removal and CH4 production in anaerobic digestion.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Engineering, Environmental
Zuotao Zhang, Jiao Sun, Xiaoqiang Gong, Chongyang Wang, Hui Wang
Summary: The synergistic metabolism between anammox cultures and nitrate-reducers for anaerobic PAH biodegradation is explored in this study. It includes the identification of anammox culture and anammox bacterium that can perform nitrogen metabolism in the biodegradation processes, the inhibitory effect of PAH and nitrite on the activities of anammox culture and nitrate-reducers, and the synergistic metabolic processes. The results show that anammox culture containing Candidatus Kuenenia efficiently reduces nitrite accumulation and inorganic carbon emissions, and significantly promotes biodegradation efficiency.
Article
Engineering, Environmental
Zuotao Zhang, Jiao Sun, Xiaoqiang Gong, Chongyang Wang, Hui Wang
Summary: A new sulfate-reducing bacterium, Desulforamulus aquiferis strain DSA, was found to degrade high molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs) pyrene and benzo[a]pyrene, while reducing sulfate to sulfide. The metabolic processes for anaerobic pyrene and benzo[a]pyrene degradation were proposed based on detecting intermediates and analyzing the genome. This study provides new guidance for anaerobic HMW-PAHs degradation under sulfate-reducing conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Organic
Alex van der Ham, Hermen S. Overkleeft, Dmitri V. Filippov, Gregory F. Schneider
Summary: This study presents a novel gram-scale synthesis of CPP in three steps starting from pyrene. The key steps involve the ring contraction of pyrene-4,5-dione to oxoCPP in a single step, as well as the direct reduction of oxoCPP to CPP. The methodology benefits from a small number of synthetic steps, use of relatively non-hazardous reagents, and optimized purification procedures, making CPP accessible in useful quantities.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Polymer Science
Hau-Ren Yang, Yen-Yu Chen, Han-Sheng Sun, Shih-Huang Tung, Shou-Ling Huang, Po-Chia Huang, Jey-Jau Lee, Yu-Ying Lai
Summary: Random incorporation of two types of pyrenes into P(NDI2OD-T2) affects the polymer's order and crystal structure through different mechanisms, thus influencing the charge transport properties of organic field-effect transistors (OFETs).
Article
Environmental Sciences
Jose Trevino-Resendez, Petia Mijaylova Nacheva
Summary: This research focused on the synergistic removal of two commonly found polycyclic aromatic hydrocarbons, Naphthalene and Phenanthrene, through a combination of electro-oxidation and biodegradation in a submerged membrane bioreactor. The study found that the use of Ti/IrO2 anode and specific operating conditions led to high removal efficiencies for both compounds, demonstrating the feasibility of the coupled EO-SMBR system in treating PAH-contaminated water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Agricultural Engineering
Xiaolu Li, Yin Liu, Xuyao Li, Zhiyi Qin, Yu Su, Stefano Freguia, Leiyu Feng, Yinguang Chen
Summary: This prospective study investigated the influence of phenanthrene (PHE), a general polycyclic aromatic hydrocarbon found in waste activated sludge, on sludge alkaline dark fermentation for hydrogen accumulation. The yield of hydrogen increased by 1.3-fold compared to the control when PHE concentration was 50 mg/kg TSS, reaching 16.2 mL/g TSS. Mechanism research revealed that PHE promoted hydrogen production and the abundance of functional microorganisms, while reducing homoacetogenesis.
BIORESOURCE TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Meng Zhang, Yitao Zhu, Yaobin Lyu, Yaqi Luo, Tianxin Duan, Li Wei, Li Pingping
Summary: Deashing treatment can enhance the sorption capacity of biochars for naphthalene and 1-naphthol by reducing surface polar groups and enhancing hydrophobic sorption domains. The removal of minerals in biochars promotes diffusion of organic molecules towards surface hydrophobic domains, leading to an increase in the sorption rate constant. Deashed biochars exhibit lower rate constants for the slow sorption fraction due to their higher aromaticity and larger surface area, inhibiting the diffusion of sorbates into condensed domains.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Environmental Sciences
Jiao Sun, Zuotao Zhang, Hui Wang, Matthew J. Rogers, Haijiao Guo, Jianzhong He
Summary: The study demonstrated the effective anaerobic degradation of PAHs using the anaerobic co-culture DYM1 obtained from petroleum-polluted soil without the need for additional terminal electron acceptors. This provides a novel approach for recovering energy from toxic pollutants in the form of methane.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Zuotao Zhang, Jiao Sun, Haijiao Guo, Xiaoqiang Gong, Chongyang Wang, Hui Wang
Summary: This study provides the first evidence of a pure-culture anaerobic phenanthrene-degrading sulfate-reducer, revealing the initial steps of anaerobic phenanthrene biodegradation processes with sulfate as an electron acceptor.
JOURNAL OF HAZARDOUS MATERIALS
(2021)