Environmental Technology & Innovation
·
2024
·
IF 6.7
Shiyuan Liu,Qin Qiu,Hong Yang,Lai Zhou,Xueqiang Zhu
Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic pollutants known for their carcinogenic, teratogenic, and mutagenic properties. A considerable amount of PAHs has been released into groundwater. Persulfate-based advanced oxidation processes (PS-AOP) are commonly employed to remediate such contamination. However, traditional in-situ chemical oxidation (ISCO) faces challenges such as concentration rebound and tailing. To address these issues, sodium persulfate sustained release materials (PDS@SA) and ferrous sulfate sustained release materials (FeSO 4 @SA) were developed using stearic acid (SA) as a binder. Batch and column experiments were conducted to evaluate the efficacy of pyrene degradation through PDS@SA activated by FeSO 4 @SA. The batch experiments showed that the optimal mass ratio of FeSO 4 @SA to PDS@SA was 1:2, achieving degradation efficiencies over 95 % for pyrene with various concentrations (5, 10, 15, 20 mg⸱L −1 ) within 2 h. The column experiments showed that sustained release materials (FeSO 4 @SA and PDS@SA) with a particle size of 5 mm achieved an average removal rate of 89.3 % during days 7–15, while those with particle sizes of 7.5 mm and 10 mm achieved average removal rates of 68.5 % and 74.6 % during days 15–23, respectively. Additionally, electron paramagnetic resonance (EPR) analysis confirmed sulfate radicals SO 4 - ⸱ and hydroxyl radicals ⸱OH as the primary oxidative species during pyrene degradation. These findings suggested that the sustained activation of PDS by sustained release Fe 2+ represents a viable method for degrading PAHs in groundwater.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
The Innovation
·
2025
·
IF 25.7
Yuting Lin,Jianyu Zhang,Wen-Jin Wang,Zhenguo Tang,Xianying Fang,Xu Xu,Fritz E. Kühn,Zheng Zhao,Qiang Yong,Ben Zhong Tang,Xu-Min Cai
The aggregation process plays a significant role in regulating the aggregate structures from molecules toward macroscopic photophysical properties. Pyrene (Py), as the simplest dimer candidate, serves as a suitable model for studying the aggregation. Herein, a series of Py-based aggregation-induced emission (AIE) materials have been investigated by clarifying the comprehensive roles of oxygen, substituents, molecular motion, and packing during aggregation, initially realizing the aim of controlling aggregate structures. With a largely planar and conjugated conformation, Py shows anomalous AIE characteristics due to the oxygen quenching at the molecular level but turn-on fluorescence in the aggregate state because of the oxygen isolation. Although introducing substituents induces molecular motion and similarly weakened luminescence in the molecular state, the impact of substituents on the aggregate-state photophysical properties enormously differs, exhibiting from weak blue, strong cyan, and strong green to weak yellow emissions, due to variable aggregate structures. Interestingly, the natural alicycle-substituted Py-dehydroabietylamine (Py-DAA) exhibits both mechanochromism and acidichromism, which can be synergistically applied in dynamic encryption-decryption. This work not only elucidates the unique AIE property of Py for the first time but also clarifies the bridging role of aggregation between single-molecular and aggregate states, achieving preliminary control over the aggregate structures.
研究领域:
化学
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材料科学
·
光物理学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jingnan Lu,Ran Wang,Manzi Hu,Kezhou Cai,Xinglan Du,Jieshun Cheng,Haimei Hu,Hui Zhou,Baocai Xu
Benzo( a )pyrene (B( a )P) is a structurally stable and carcinogenic compound, and B( a )P deposition and transport from smoking environment particulates to smoked meat products is a global challenge. In this study, a novel photosensitive bifunctional composite gel (ST/SiO 2 -Mn) was successfully synthesized as a reliable material for reducing PM 2.5 -B( a )P in the smoke environment. B( a )P removal experiments demonstrated that the adsorption and filtration properties of the gel effectively reduced the emission of PM 2.5 -B( a )P in smoke environment. The ST/SiO 2 -Mn gel removed 88.5 % of PM 2.5 -B( a )P in 240 min, which further led to a 59.7 % decrease in B( a )P on the sausage surface. In addition, photocatalytic experiments demonstrated that the ST/SiO 2 -Mn composite could effectively remove B( a )P, and 50 μg/mL B( a )P could be completely degraded within 20 min. Free radical trapping experiments showed that superoxide radicals (•O 2 -) contributed significantly to the degradation process. In conclusion, this study provides valuable insights for effective PM 2.5 -B( a )P degradation without increasing economic burden.
研究领域:
食品安全
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Jiahui Zhu,Shiqi Liu,Yu Shen,Jia Wang,Huiqian Wang,Xinhua Zhan
Microplastics wildly occur in soil and they can become the carriers of persistent contaminants. However, the influence of microplastics on polycyclic aromatic hydrocarbons vertical translocation in the soil system after rainfall is limitedly understood. Here, experiments were conducted to study the influence of polyethylene (PE), polystyrene (PS) and polyvinyl chloride (PVC) microplastics on the leaching behavior and bioavailability of phenanthrene (Phe). The adsorption capacity of phenanthrene on the microplastics followed the order of PS > PE > PVC . The Phe concentrations in the top soil layer after 15 days of leaching with water were 30.25, 28.32 and 27.25 mg kg −1 for the treatments of Phe-PS, Phe-PE and Phe-PVC respectively, which is consistent with the adsorption capacities of microplastics. The concentrations of Phe were correlated with the microplastic adsorption capacities at soil depths of 5–45 cm. Under long-term leaching, Phe could reach the deeper soil layer. Phe concentrations significantly decreased in the leachate over time. Phe concentrations in wheat had a positive correlation with that in leachate/leached top soil layer. Our findings are beneficial to accurately evaluate the ecological risk of the combined contamination of PAHs and microplastics, and improve the understanding of the environmental behaviors of different microplastics.
研究领域:
环境科学
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生态学
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2015
·Vol. 226
·期 5
·1-9
·
IF 1.554
Wang Qian,Liu Xiaoyan,Wang Chuanhua,Zhang Xinying,Li Hongbing,Chen Tingru,Hou Yunyun,Chen Xueping,Liang Xia
Four kinds of surfactants were used to increase accessibility of pyrene and cadmium (Cd) in simulated pyrene, Cd, and pyrene-Cd soils in this study. Tea saponin (TS) at 40 mg L −1 groups (exchangeable fraction of Cd and bioaccessible fraction of pyrene were 8.96 and 36.93 mg kg −1 ) showed more preferable potential application in improving solubilization capability than other surfactants. The morphology of Cd was transformed from Fe-Mn oxides (8.86 to 7.61 and 8.67 to 7.99 mg kg −1 in Cd and pyrene-Cd soil) and associated to carbonates fractions (4.46 to 4.36 and 4.28 to 4.36 mg kg −1 in Cd and pyrene-Cd soil) to exchangeable fraction with adding TS. These two morphological changes were important processes in the solubilization of Cd. The morphology of pyrene was transformed from associated fraction (72.15 to 61.95 and 71.02 to 63.48 mg kg −1 in pyrene and pyrene-Cd soil) to bioaccessible fraction (26.66 to 33.71 and 26.91 to 36.93 mg kg −1 in pyrene and pyrene-Cd soil) with adding TS. This morphological transformation was important in the improving of solubilization capacity of pyrene. In contrast, the solubilization of pyrene was promoted in the presence of Cd in pyrene-Cd soil (the bioaccessible fractions were 33.71 and 36.93 mg kg −1 in pyrene and pyrene-Cd soil), but the solubilization of Cd was hindered in the presence of pyrene (the exchangeable fractions of Cd were 8.86 and 8.67 mg kg −1 in Cd and pyrene-Cd soil). These findings will be beneficial for application of surfactants in soil remediation.
研究领域:
环境科学
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土壤学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yibin Yang,Rui Chen,Zhiqiang Zhang,Yuke Qin,Attiqa Parveen,He Bai,Xiaoqiang Jia
Phenanthrene, a pervasive polycyclic aromatic hydrocarbon (PAH), poses significant environmental and health risks due to its persistence and bioaccumulation. This study presents the development of a synthetic bacterial consortium comprising three engineered Escherichia coli BL21(DE3) strains, each harboring distinct catabolic modules encoded by pET-28(a) plasmids for the complete mineralization of phenanthrene. The consortium was engineered by integrating 17 genes critical for phenanthrene degradation, organized into three distinct modules that harness the collective metabolic potential of separate strains to enhance the degradation process. Each module was tailored to a specific phase of phenanthrene catabolism, ensuring the coordinated and efficient breakdown of the pollutant. Following the identification of rate-limiting enzymes within the up- and downstream degradation modules, the eight corresponding genes were subjected to laboratory evolution using the SCRaMbLE method to bolster the degradation capabilities of the strains. The consortium was then tested in a minimal salt medium (MSM) containing 100 mg/L phenanthrene. Following their evolution, the two SCRaMbLE strains E. coli SCRPHE033 and E. coli SCRKA065 exhibited enhanced degradation rates of 11.5 and 25.18 % for their respective substrates. Finally, the comprehensive phenanthrene degradation system, which includes the two SCRaMbLE strains and E. coli CRSA, was subjected to comprehensive optimization, after which it achieved a significant degradation efficiency of 84.33 % for 100 mg/L phenanthrene within a 120-hour timeframe. This research demonstrates the potential of synthetic biology in constructing microbial consortia for environmental bioremediation based on the SCRaMbLE method, offering a promising strategy for mitigating PAH pollution.
研究领域:
合成生物学
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环境微生物学
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基因组工程
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生物修复
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Meng Xia,Shuai Zhang,Kaihao Xu,Chengxue Zhang,Xiaocong Wang
In arid and semi-arid areas, the remediation of saline-alkaline soils polluted by organic contaminants is challenging. In this study, the adsorption–photocatalysis synergistic removal of organic contaminants was realised using the MIL-88A(Fe) catalyst, and the saline-alkaline soils were remediated simultaneously. The adsorption isotherm of catalyst conformed to Langmuir model, and the photocatalytic degradation of PHE in an optimal visible light system achieved a PHE degradation efficiency of up to 86.2 % within 30 min. Based on the identification of active oxygen species, the PHE photocatalytic degradation was primarily driven by holes (h + ) and superoxide radicals (·O 2 - ), followed by hydroxyl radicals (·OH) and singlet oxygen ( 1 O 2 ). Furthermore, the determined physical and chemical properties of the saline-alkaline soils indicated that the soil pH value decreased to 6.82, effectively increasing the absorbable nitrogen content and improving soil fertility. This study offers a new strategy for the removal of organic contaminants under special soil medium conditions.
研究领域:
环境科学
·
土壤修复
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DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Min Liu,Xinyu Gao,Fei Pan,Yuwei Deng,Dongsheng Xia,Zhang Li,Jie Fu
This work reported the role of pyrene in formation of naturally occurring silver nanoparticles (AgNPs) via the reduction of silver ions by humic acid under the UV irradiation in the aquatic environment. An increase in temperature (25–90 °C), pH (5–9) or concentration of humic acid (2.5–15 mg/L) led to an enhanced formation of AgNPs. The TEM images indicated the formed AgNPs were spherical with an average particle size of ∼20 nm. Pyrene showed a limited capacity for the photoreduction of silver ions, and when both pyrene and humic acid were present, pyrene would compete with humic acid for the reduction of silver ions. However, the presence of pyrene would enhance the stability and suppress the antibacterial activity of natural AgNPs. The UV–vis spectra of AgNPs suspensions generated with pyrene did not change within 45 days. The inhibition rates against Escherichia coli of AgNPs generated with pyrene were 8–32% lower than those of AgNPs generated without pyrene. This study provides environmental implications on the fate and ecotoxicity of natural AgNPs with interaction of polycyclic aromatic hydrocarbons .
研究领域:
环境科学
·
纳米生物学
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DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2012
·Vol. 108
·期 2
·531-544
·
IF 0.829
He Min-Qiang,Pan Ai-Xia,Xie Ji-Min,Jiang De-Li,Yuan Xin-Hua,Chen Min
Phosphotungstic heteropoly acid (PW) supported on various oxides (SiO 2 , TiO 2 , K-10 montmorillonite and γ-Al 2 O 3 ) were synthesized and used as catalysts for Friedel–Crafts acylation of pyrene with acetic anhydride to 1-acetylpyrene for the first time. The as-prepared catalysts were characterized by specific surface area measurement, X-ray diffraction, infrared spectroscopy, and temperature programmed desorption of ammonia. SiO 2 -supported phosphotungstic heteropoly acid (PW/SiO 2 , 40 wt%) was found to be the most active catalyst in the acylation giving 91.8 % yield and 100 % selectivity for 1-acetylpyrene at reaction temperature of 60 °C under ambient pressure. The effect of PW Loading, PW/SiO 2 amount, molar ratio of reactants, reaction temperature and reaction time on the catalytic acylation reaction were studied in detail to optimize the process parameters. The reusability of the PW/SiO 2 catalyst was appraised, and the possible pathway for the production of the Friedel–Crafts acylation of pyrene with acetic anhydride catalyzed by phosphotungstic heteropoly acid was also discussed briefly.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 23
·期 6
·5705-5711
·
IF 2.828
Wang Qian,Liu Xiaoyan,Zhang Xinying,Hou Yunyun,Hu Xiaoxin,Liang Xia,Chen Xueping
Tea saponin (TS), a kind of biodegradable surfactant, was chosen to improve the accessible solubilization of pyrene and cadmium (Cd) in co-contaminated soils cultivated Lolium multiflorum . TS obviously improved the accessibility of pyrene and Cd for L. multiflorum to accelerate the process of accumulation and elimination of the pollutants. The chemical forms of Cd was transformed from Fe-Mn oxides and associated to carbonates fractions into exchangeable fractions by adding TS in single Cd and pyrene-Cd contaminated soils. Moreover, the chemical forms of pyrene were transformed from associated fraction into bioaccessible fraction by adding TS in pyrene and pyrene-Cd contaminated soils. In pyrene-Cd contaminated soil, the exchangeable fraction of Cd was hindered in the existence of pyrene, and bioaccessible fraction of pyrene was promoted by the cadmium. Besides, in the process of the pyrene degradation and Cd accumulation, the effect could be improved by the elongation of roots with adding TS, and the microorganism activity was stimulated by TS to accelerate the removal of pollutions. Therefore, Planting L. multiflorum combined with adding TS would be an effective method on the phytoremediation of organics and heavy metals co-contaminated soils.
研究领域:
环境科学
·
植物学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chong Zhang,Xiaoyi Jiang,Shuai Zhang,Xian Cao,Hui Wang,Takashi Sakamaki,Xianning Li
The polycyclic aromatic hydrocarbons (PAHs) frequently accumulate in sediments, particularly those near industrial sites. The efficacy of microbial electrochemical systems (MESs) in electricity generation and PAHs degradation is intricately linked to the microbiome’s response to high contaminant levels. Metabolomics and metagenomics were applied to elucidate the impact of a high pyrene concentration on the functional structure and metabolic dynamics of sediment microbiomes within MES. In sediment with a high pyrene concentration, both the electrical output of MES and efficiency of their microbiomes in degrading organic substrates and pyrene were markedly reduced. These conditions were associated with the enrichment of PAH-degrading microorganisms, such as Hydrogenophaga and Flavobacterium . Analyses of metabolites and genetic profiles revealed that metabolic pathways were primarily influenced in MES exposed to low pyrene concentrations whereas fewer metabolic pathways were activated in MES exposed to high concentrations; instead, pathways representing functions critical for microbial survival and communication were activated as well. According to enzymatic analyses, low pyrene levels promoted carbohydrate metabolism by sediment microorganisms, whereas high levels had an inhibitory effect. An examination of electron transport enzymes revealed that intracellular electron transfer was facilitated by both low and high concentrations. However, high levels impeded enzymes associated with outer membrane electron transfer, hindering electron movement from intracellular to extracellular electron acceptors and thus negatively affecting the electrical output of MES. Our study provides crucial theoretical insight and mechanistic understanding for addressing the challenges that may be encountered when MES are used to treat pyrene-contaminated sediment near industrial sites.
研究领域:
环境科学
·
微生物学
·
分子生物学
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产品关联
DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2024
·Vol. 46
·期 8
·1-12
·
IF 3.2
Zhang Zhou,Wang Litao,Liang Hong,Chen Guanyu,Tao Huayu,Wu Jing,Gao Dawen
Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants with carcinogenic, mutagenic and teratogenic effects. The white-rot fungi in the fungal group have significant degradation ability for high molecular weight organic pollutants. However, exogenous fungi are easily antagonized by indigenous microorganisms. Low molecular weight organic acids, a small molecular organic matter secreted by plants, can provide carbon sources for soil microorganisms. Combining organic acids with white rot fungi may improve the nutritional environment of fungi. In this study, immobilized Trametes versicolor was used to degrade benzo[a]pyrene in soil, and its effect on removing benzo[a]pyrene in soil mediated by different low molecular weight organic acids was investigated. The results showed that when the degradation was 35 days, the removal effect of the experimental group with citric acid was the best, reaching 43.7%. The degradation effect of Trametes versicolor on benzo[a]pyrene was further investigated in the liquid medium when citric acid was added, and the effects of citric acid on the biomass, extracellular protein concentration and laccase activity of Trametes versicolor were investigated by controlling different concentrations of citric acid. In general, citric acid can act as a carbon source for Trametes versicolor and promote its extracellular protein secretion and laccase activity, thereby accelerating the mineralization of benzo[a]pyrene by Trametes versicolor . Therefore, citric acid can be used as a biostimulant in the remediation of PAHs contaminated soil with Trametes versicolor .
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）