CHEMOSPHERE
·
2023
·
IF 8.8
Yue Sun,Yanbo Liu,Gangsen Yue,Jinhui Cao,Chong Li,Jie Ma
Traditional natural attenuation studies focus on aqueous process in the saturated zone while vapor-phase biodegradation and natural attenuation in the unsaturated zone received much less attention. This study used microcosm experiments to explore the vapor-phase biodegradation and natural attenuation of 23 petroleum VOCs in the unsaturated zone including 7 monoaromatic hydrocarbons, 6 n-alkanes, 4 cycloalkanes , 3 alkylcycloalkanes and 3 fuel ethers. We found that monoaromatic hydrocarbon vapors were easily attenuated with significantly high first-order attenuation rates (9.48 d −1 -43.20 d −1 ) in live yellow earth, of which toluene and benzene had the highest rates (43.20 d −1 and 28.32 d −1 , respectively). The 13 aliphatic hydrocarbons and 3 fuel ethers all have relatively low attenuation rates (<0.54 d −1 ) in live soil and negligible biodegradation contribution. We explored the effects of soil types (black soil, yellow earth, lateritic red earth and quartz sand), soil moisture (2, 5, 10, and 17 wt%) contents and temperatures (4, 15, 25, 35 and 45 °C) on the vapor attenuation. Results showed that increasing soil organic matter (SOM) content, silt content, porosity and soil microorganism numbers enhanced contaminant attenuation and remediation efficiency. Increasing moisture content reduced the apparent first-order biodegradation rates of monoaromatic hydrocarbon vapors. The vapor-phase biodegradation had optimal temperature (∼25 °C in yellow earth) and increasing or decreasing temperature slowed down biodegradation rate. Overall, this study enhanced our understanding of vapor-phase biodegradation and natural attenuation of petroleum VOCs in the unsaturated zone, which is critical for the long-term management and remediation of petroleum contaminated site.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Liangliang Wang,Chenhang Zhang,Tongzhou Xu,Lirong Lv,Zhongguo Zhang,Can He
A wet scrubbing – catalytic ozonation (WCO) process with activated carbon (AC) loaded MnOx (MnOx/AC) as the catalyst was developed, based on volatile organic compounds (VOCs) can be efficiently removed. The mineralization efficiency, degradation pathway and mechanism, and effects of the process operating parameters were investigated in detail using toluene as the target pollutant. The results show that the average removal efficiency of toluene reached 71.82 % within 90 min under optimal conditions (C Toluene = 100 mg/m 3 ; C O3 = 1 mg/L; catalyst loading = 5 g/L; pH = 7; gas flow = 500 mL/min), which outperformed that of the gaseous system. Quenching experiments and electron spin resonance spectroscopy indicate that OH and O 2 − are the two main reactive oxygen species (ROSs) in the system, which facilitate the opening of the benzene ring and significantly reduce by-products. The intermediates of toluene degradation were identified by proton-transfer reaction time-of-flight mass spectroscopy (PTR-TOF-MS). The results indicate that most of the intermediates generated in the system are captured in water rather than being emitted into the atmosphere. In the pilot-scale experiments, the WCO process exhibited a stable VOC removal efficiency (≥61.05 %) for 10 d in the treatment of actual low-concentration VOCs. Therefore, in this study, an effective process for the removal of low-concentration VOCs is proposed, which can be used for multiple VOC treatments.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Zhiqiang Yi,Yusen Yue,Jianquan Kan,Zhirong Wang,Sameh Awad,Amel Ahmed Ibrahim,Muying Du
Gastrodia elata Bl. Is susceptible to infestation by the fungus Fusarium oxysporum , which can cause severe post-harvest diseases. This paper presents the findings of an investigation into the control and bacteriostatic mechanisms of Lactobacillus curvatus 2768-VOCs on F. oxysporum -infected G. elata . The results of both in vitro and in vivo tests demonstrated that L. curvatus 2768-VOCs exhibited inhibitory effects against F. oxysporum , with inhibition rates of 63.37% and 44.4%, respectively. The results of the in vivo test also demonstrated that the pre-fumigation approach exhibited superior efficacy compared to direct fumigation, with the former showing a preventive effect. Furthermore, it was discovered that VOCs disrupted the integrity of F. oxysporum cell membranes and altered their permeability, resulting in the leakage of cell contents. The fumigation caused damage to the mycelial structure, accompanied by a notable decline in the total lipid and ergosterol content, and an appreciable increase in MDA content. Moreover, the fumigation of VOCs markedly diminished the activities of ATPase and mitochondrial dehydrogenase, thereby disrupting the respiration of F. oxysporum and its energy metabolism. The VOCs were subjected to GC-MS analysis, which revealed that the relative content of acids was the highest, particularly formic acid and glyoxalic acid. The study offers a theoretical basis for the biological control of postharvest diseases in G. elata .
研究领域:
植物病理学
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微生物学
·
药用植物学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiao Song,Yanan Kong,Xiaoxia Sun,Shuaihu Ma,Siyu Zhu,Zhilou Liu,Hui Liu,Lei Wang,Shu Yang
Achieving efficient catalytic oxidation of VOCs by transition metal oxides at low temperatures is a major challenge. Controlling exposed crystal facets through crystal facet engineering is an efficient strategy for enhancing the catalytic activity of catalysts. Herein, we proposed an anion-inducted method for precisely modulating the exposed crystal facets on Co 3 O 4 catalysts by using different types of cobalt salts. The Co 3 O 4 -a catalyst with highly exposed (220) facets exhibits exceptional catalytic performance, achieving 90% conversion of benzene and toluene at 239 and 240 °C, respectively, which are significantly lower than the temperatures required for Co 3 O 4 -s (286 and 299 °C). The specific reaction rates of Co 3 O 4 -a for benzene and toluene catalytic oxidation were 19.7 × 10 −9 mol/m 2 /s and 15.5 × 10 −9 mol/m 2 /s, which were 3.1 times and 19.4 times than that of Co 3 O 4 -s (6.3 × 10 −9 mol/m 2 /s and 0.8 × 10 −9 mol/m 2 /s), respectively. The excellent activity of Co 3 O 4 -a catalyst was due to stronger interactions between the tetra-coordinated cobalt atoms (Co 4c ) on the (220) crystal plane with reactants by in situ DRIFTS and DFT results. The Co 4c sites act as bifunctional active centers, simultaneously inducing C C bond elongation in aromatic hydrocarbons and O O bond activation in O 2 , which the pre-activation of adsorbed molecules can lower the energy barriers for C H cleavage and ring-opening reactions, and ultimately promotes the deep oxidation of VOCs. This research deepens the understanding of surface structure-oriented catalysis in VOCs oxidation, while aiding the rational design of advanced catalysts.
研究领域:
催化化学
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环境化学
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材料科学
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表面科学
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物理化学
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纳米催化
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能源与环境催化
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DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Yang Lv,Shaopeng Wu,Haiqin Xu,Na Li,Quantao Liu,Huan Wang,Yingxue Zou,Qi Jiang,Serji Amirkhanian
The adsorption kinetics and molecular dynamics were modeled based on the structure-assembled technique of MOFs , conjugate bonding and targeted adsorption of characteristic pollutants. The mechanism of interaction between UiO-66 and rubber-modified asphalt (RMA) was simulated. The adsorption characteristics between UiO-66 and five class I carcinogens, high concentration VOCs components were simulated by Sorption module. The conjugate bonding and targeting adsorption mechanism between UiO-66 on VOCs was elucidated by combining the GC-MS analysis data. The results were showed that the interaction between UiO-66 and rubberized asphalt was influenced by the number of molecules, contact area, spatial site resistance, and active groups. The content of UiO-66 should be controlled below 3.31 %. The small size of vinyl chloride molecules made it easier to enter the pore structure of UiO-66 with a maximum inhibition rate of 91.75 %. The 1,2-dichloropropane has a large molecular size, spatial site resistance, non-conjugation effect, and the smallest adsorption amount of 72.2 %. The total concentration of VOCs was decreased from 726.38 mg/cm 3 to 166.12 mg/cm 3 , a reduction of 77.13 %. The adsorption of UiO-66 on VOCs molecules was affected by molecular size, carbon chain length, conjugation effect, polarity and other factors. VOCs and UiO-66 form a p-d, d-d π conjugation effect based on the conjugated structure, targeting adsorption within the benzene ring of the organic framework.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CARBON
·
2025
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IF 11.6
Hongyang Zhou,Qiang Xie,Shimei Gu,Xiuchun Li,Yihuan Zhou,Dingcheng Liang,Jinchang Liu
Purification of industrial gaseous emissions containing volatile organic compounds (VOCs) by adsorption of activated carbon (AC) has been identified as an established method, which is creating a strong demand for rapid predicting VOCs adsorption performance of adsorbents. However, experimental data acquisition is costly and time-consuming. Meanwhile, traditional machine learning methods fail to effectively consider physical knowledge. This study proposes a physical experience -driven neural network (PEDNN) based on feature analysis for predicting VOCs adsorption performance of AC with small sample size. 33 data points were collected at first and extended to 83 using the synthetic minority over-sampling technique (SMOTE). Then the feature correlation and importance analysis results were exploited as physical constraints to construct PEDNN model, and its predicted performance were compared with those predicted by traditional model, including Support Vector Regression (SVR), Random Forest (RF), and Extreme Gradient Boosting (XGBoost) models. The results indicate that the PEDNN model exhibits superior performance on both the validation and test datasets, with R 2 values of 0.951 and 0.947, respectively. During the final process of experimental validation, the experimental data served as the test set to assess the generalization ability and predictive accuracy of the four trained models. The PEDNN model exhibited the best performance, with an R 2 value of 0.893. This work provides a novel approach for predicting VOCs adsorption performance with small sample size.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Hongyan Yu,Jingxu Zhang,Qingping Liu,Duxing Li,Ruonan Pan,Gan Miao,Yidi Chen,Zhe Kou,Guangbo Qu,Rong Zhang,Xiaoting Jin,Yuxin Zheng
Volatile organic compounds (VOCs) emitted from interior decorations are suggested to pose substantial respiratory hazards as they disturb the immune response in the lung. Despite this, the characteristics and mechanisms underlying immune cell responses to real-world VOC mixtures, rather than previously individual or dominant VOC species, remain poorly understood. Employing a whole-body inhalation exposure model, we reveal that interior decorative VOCs alter pulmonary immune cell profiles with a persistent increase in alveolar T cells. This sustained elevation results from intensified lymphoid-biased hematopoiesis in the bone marrow (BM) rather than in situ lung, which is followed by thymic maturation and subsequent recruitment to lung tissues. The ex vivo biosensor and antibody neutralization assays clarify that VOCs-induced lymphoid-biased hematopoiesis is primarily driven by osteogenic differentiation within the BM niche, a process further regulated by interleukin-6 (IL-6) and interleukin-17A (IL-17A). Moreover, the cohort study associates VOCs-expanded lymphocytes with increased risks of obstructive lung diseases, where exposed individuals show elevated IL-6 and IL-17A levels, correlating with VOC concentrations and lymphocyte proportions. These findings highlight compelling indicators (i.e., T cells) and potential interventions (i.e., IL-6 and IL-17A) for evaluating and mitigating VOC-associated respiratory risks.
研究领域:
免疫学
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环境健康
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呼吸医学
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毒理学
·
造血生物学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huijuan Liu,Keyan Wei,Chao Long
Y zeolite with high specific surface area and peculiar microporous channels has been regarded as a promising adsorbent in volatile organic compounds (VOCs) control. However, a scalable strategy for improving the hydrophobicity and mass diffusion of Y zeolite to remove VOCs remains a challenge. In this study, we successfully synthesized two NaY@ meso -SiO 2 core–shell composites with different shell thicknesses by coating NaY zeolite with mesoporous SiO 2 (NaY@ meso -SiO 2 -0.8 and NaY@ meso -SiO 2 -1.2), which significantly improved the hydrophobicity of NaY zeolite and diffusion of VOCs into NaY zeolite. The results of XRD, SEM, TEM, FTIR and BET confirmed the successful synthesis of core–shell composites. The adsorption equilibrium experiments showed that coating NaY zeolite with mesoporous SiO 2 effectively enhanced the hydrophobicity of NaY zeolite. Under RH = 0, the adsorption capacity of pristine NaY zeolite was the highest; while under RH = 50%, NaY@ meso -SiO 2 -1.2 exhibited stronger adsorption ability and excellent hydrophobicity. The adsorption diffusion indicated that coating NaY zeolite with mesoporous SiO 2 remarkably promoted the diffusion of VOCs into composites. Compared with the pristine NaY, core–shell composites showed higher diffusion coefficients and lower diffusion activation energy under RH = 0, particularly NaY@ meso -SiO 2 -1.2. In addition, linear solvation energy relationships (LSERs) revealed that π-/n-electron pairs interaction became weak and dipolar interactions were enhanced when water was adsorbed on the surface of NaY@ meso -SiO 2 -1.2. Hydrogen bonding decreased when RH level reached 50% and then increased with the increase of RH from 50% to 90%.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 36
·e202203273
·
IF 2.307
Jingting Qiu,Xiang Xu,Baogen Liu,Yang Guo,Huijun Wang,Lingyun Yu,Yuwei Jiang,Changsheng Huang,Binfeng Fan,Zheng Zeng,Liqing Li
Graphical Zeolitic imidazolate frameworks-8 (ZIF-8) with different average sizes (50, 120, and 2200 nm) is successfully prepared. Carbonization is proved to be an effective method to adjust the aperture for derived porous carbon of ZIF-8. Among them, ZC50 possesses narrow micropore in range of 0.7–1.0 nm, located in the optimal pore size range of CO 2 adsorption. Besides, ZC120 exhibits more superior mesopore structure that could strengthen VOCs adsorption. It's acknowledged that surface chemical and pore structure of adsorbent are main parameters to determine adsorption results. Herein, we prepared zeolitic imidazolate frameworks-8 (ZIF-8) with different average sizes (50, 120, and 2200 nm) and demonstrated their specific surface area and pore volume decreased with increasing particle size. ZIF-8 (ZN) exhibits a large specific surface area (1626.4 m 2 g −1 ) and total pore volume (1.088 mL g −1 ), but it has been shown to lack the non-specific adsorption capacity for the adsorbate. Carbonization at 800 °C is proved to be an effective method to expose massive surface nitrogen-containing functional groups and adjust the aperture to an appropriate pore size range for derived porous carbon of ZIF-8 (ZCN). High nitrogen content (18.7 at. %) greatly improves the affinity for CO 2 and Volatile Organic Compounds (VOCs), as explained by the density functional theory (DFT) calculation results. Meanwhile, particle size influences the pore-forming results after carbonization directly. Among them, ZC50 generates a certain amount of narrow micropore in range of 0.7–1.0 nm, located in the optimal pore size range of CO 2 adsorption calculated by Grand canonical Monte Carlo (GCMC) simulation, thus possessing the largest CO 2 adsorption capacity (4.03 mmol g −1 at 25 °C). Besides, ZC120 exhibits more superior mesopore structure that could strengthen multilayer adsorption for VOCs.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 41
·e53004
·
IF 3.057
Zheng Qu,Jiamin Huang,Guoliang Wu,Liangliang Dong,Chunfang Zhang,Yunxiang Bai
Urgent needs for the removal of volatile organic compounds (VOCs) from gas streams has stimulated a vigorous research for high-performance separation membranes. Herein, porous iron-organic molecular cage (Fe-cage) embedded polydimethylsiloxane (PDMS) mixed miatrix membranes (MMMs) were fabricated through emulsion casting method for efficient VOCs removal. The membrane separation performance was systematically investigated by separating VOC/N 2 gas mixtures under various operating conditions (e.g., feed concentration, operating temperature) using n -hexane, n -heptane, and cyclohexane as model organic vapors. It was found that the resultant membranes demonstrated homogeneous Fe-cage dispersion and intimate interfacial adhesion. With the increase of the Fe-cage loading, the MMMs demonstrated obviously improved permselectivity for the separation of n -hexane/N 2 and n -heptane/N 2 . The MMM containing 4 wt% Fe-cage showed a n -heptane permeability of 1657 × 10 −8 mol μm m −2 s −1 Pa −1 and a n -heptane/N 2 selectivity of 145 at 25°C when the feed concentration is 4.3 mol%. These values were 231% and 158% of those for the pristine PDMS membrane, respectively. Furthermore, the VOC permeability and VOC/N 2 selectivity of the membranes increased with decreasing operating temperature or increasing feed concentration. Because of its excellent mixed-gas VOC/N 2 permselectivity, the Fe-cage embedded PDMS membrane could find use in petrochemical applications such as gasoline vapor recovery.
研究领域:
材料科学
·
环境工程
·
化学工程
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产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Siyue Zhou,Jingjing Fang,Kai Chao,Liang Li
Toluene, dichloromethane, and methanethiol were selected as probe molecules for aromatic, chlorinated, and sulfurated VOCs, respectively, to evaluate the catalytic properties of Pt/CeO 2 composites. The T 90 for toluene, DCM, and methanethiol oxidation were only 153, 265, and 240 °C, when 0.9 wt% Pt/CeO 2 was used as the catalyst. The synergy between Pt and support could be responsible for the high catalytic activity and antipoisoning properties. When combined with NDIR CO 2 sensors, the composite could be used for atmospheric total organic carbon detection. The recorded data almost overlap with that of the theoretical, suggesting the excellent reliability of the dictation system.
研究领域:
环境科学
·
催化材料
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Dongyang Wu,Qing'e Sha,Shan Jiang,Luyun Liu,Citao Zhang,Jialin Song,Junhao Xu,Haoqi Chen,Guanghui Li,Zhangmin Xiang,Bin Jiang,Zhuangmin Zhong,Duohong Chen,Shupin Situ,Guanying Xu,Jianlin Hu,Boguang Wang,Junyu Zheng
China's aluminum-products industry, a large-scale consumer of industrial paints, is a potentially significant source of full-volatility organic compounds (F-VOCs). However, the emission characteristics of F-VOCs, including VOCs, intermediate-, semi-, and low-volatility organic compounds (I/S/LVOCs), and their role in ozone formation potentials (OFP), and secondary organic aerosol formation potentials (SOAP) remain unclear. In this study, we collected in-field samples from three industrial paints (solvent-based, water-based and powder paints) at spraying and drying processes, and treatment devices to analyze the emission characteristics of F-VOCs, OFP, SOAP. Results revealed water-based and powder paints—often marketed as eco-friendly—emitted non-negligible SOA precursors. The F-VOC emission factors of three paints based on the field measurement method and the material balance method were 3.3–57.3 and 1.5–61.8 (kg/t-raw materials), respectively. Due to overlooking I/S/LVOCs, conventional material balance methods underestimated F-VOC emissions from powder by 46.9–53.9 %, and SOAP and OFP from three paints by 18.1–80.9 % and 14.5–77.8 %, respectively. Despite comprising less than 25.0 % of total emissions, I/S/LVOCs dominated 70.0–80.0 % SOAP. The paint types and treatment devices rather than industrial processes are the main factors influencing volatility, phase distributions, and source profiles. Current controls reduce OFP by ∼80.0 % but SOAP by only ∼20.0 %, highlighting the evasion of I/S/LVOCs from mitigation strategies. In 2023, China's aluminum-products industry emitted 258.4 kt of F-VOCs, comparable to those from on-road diesel transportation. The findings indicate substantial F-VOC emissions from aluminum production and inadequate I/S/LVOC controls, necessitating their inclusion in emission inventories and air-quality models to enhance pollution control.
研究领域:
大气化学
·
环境科学
·
空气污染控制
·
工业排放
·
环境工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）