CHEMOSPHERE
·
2024
·
IF 8.1
Yue Sun,Jinhui Cao,Jie Ma
The fate of volatile organic compounds (VOC) vapors in the unsaturated zone is the basis for evaluating the natural attenuation potential and vapor intrusion risk. Microcosm and column experiments were conducted to study the effects chemical speciation and soil types/properties on the fate of petroleum VOCs in unsaturated zone. The biodegradation and total attenuation rates of the seven VOCs obtained by microcosm experiments in black soil and yellow earth were also generally higher than those in floodplain soil, lateritic red earth, and quartz sand. The VOC vapors in floodplain soil, lateritic red earth, and quartz sand showed slow total attenuation rates (<0.3 d −1 ). N-pentane, methylcyclopentane, and methylcyclohexane showed lower biodegradation rates than octane and three monoaromatic hydrocarbons. Volatilization into the atmosphere and biodegradation are two important natural attenuation paths for VOCs in unsaturated soil columns. The volatilization loss fractions of different volatile hydrocarbons in all five unsaturated soils were generally in the order: n-pentane (93.5%–97.8%) > methylcyclopentane (77.2%–85.5%) > methylcyclohexane (53.5%–69.2%) > benzene (17.1%–73.3%) > toluene (0–45.7%) > octane (1.9%–34.2%) > m-xylene (0–5.7%). The fractions by volatilization into the atmosphere of all seven hydrocarbons in quartz sand, lateritic red earth, and floodplain soil were close and higher compared to the yellow earth and black soil. Overall, this study illustrated the important roles chemical speciation and soil properties in determining the vapor-phase transport and natural attenuation of VOCs in the unsaturated zone.
研究领域:
环境科学
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土壤科学
·
化学工程
·
环境工程
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Jiazheng Liu,Dongzheng Wang,Zifan Li,Long Hu,Li Ni,Yang Zhou,Xin Li,Yubin Yuan,Weihua Liu
The detection of volatile organic compounds (VOCs) and their mixtures is of increasing importance in environmental monitoring and breath analysis-based disease diagnosis. Field-effect transistors (FETs) show potential for VOCs detection due to their inherent signal amplification and high sensitivity. Ionogel, with its unique electric double-layer capacitance and high polarity, offers excellent molecular enrichment for gas sensing. Accordingly, this work reports an ionogel-gated carbon nanotube-FET (IG-CNTFET) that achieves near-orthogonal selective detection of dimethyl methylphosphonate (DMMP) and triethylamine (TEA) by designing distinct ionogel materials as the gate dielectric. The mechanism originates from an anion-dominated interfacial solvation and polarization process. Different anions regulate the local solvation environment and charge distribution of the ionogel, thereby controlling the selective partitioning and interfacial enrichment of gas molecules. Owing to its charge-delocalized and weakly coordinating nature, TFSI - preferentially accommodates highly polar DMMP molecules and promotes their accumulation near the ionogel/CNT interface. In contrast, PF 6 - provides a distinct ionic environment for TEA enrichment, leading to a pronounced negative threshold-voltage shift. These analyte-specific interfacial responses ultimately enable orthogonal gas-sensing behavior. The device exhibits exceptional tunable sensing performance. Adjusting the gate voltage significantly enhances the response signal and selectivity toward the target gases. Notably, the sensor achieves a detection limit as low as 600 ppb for DMMP, and 100 ppb for TEA. In contrast, the sensor shows negligible responses to other common VOCs, such as ethanol, n-hexane, and acetone. This work provides a crucial material design strategy for developing next-generation ionogel-based gas sensors.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Taotao Gao,Han Zhang,Wenxin Wu,Ming Xue,Xiangyu Cui,Xingchun Li,Jian Lu,Fusheng Pan,Zhongyi Jiang
Hybrid membranes that incorporate functional fillers into the polymer matrix have emerged as promising membranes for separation of volatile organic compounds (VOCs). However, the pore architectures of the commonly used fillers are usually unable to perfectly match the size of the targets. Excessively large pores will compromise molecular selectivity, while ultramicropores will restrict the permeation properties. Herein, we report a hybrid membrane that incorporates a flexible metal-organic framework (Al-CDC) into poly (ether-block-amide) (Pebax) matrix to create self-adaptive transport pathways for efficient toluene/N 2 separation. The flexible Al-CDC exhibits a stimulus-response upon absorption of toluene, which triggers framework expansion (∼20% unit-cell volume increase) and concurrently imposes enhanced diffusion resistance on weakly interacting N 2 . This dynamic pore-opening and occupation mechanism enables selective absorption and low-resistance permeation of toluene. As a result, the optimized membrane (Pebax-Al-CDC-3) achieves a toluene permeability of 1.48 × 10 −6 mol μm m −2 s −1 Pa −1 and a toluene/N 2 selectivity of 1030 with stable performance over 120 h of continuous operation. Moreover, the developed membrane can also significantly enhance the separation of n -heptane/N 2 , indicating the wide effectiveness towards both aromatic and aliphatic VOCs. This work establishes that integrating flexible MOF fillers with self-adaptive pore regulation offers a promising strategy to overcome the intrinsic selectivity-permeability trade-off, providing new insights into the design of high-performance hybrid membranes for VOCs separation.
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DOI
高影响因子
Small
·
2025
·
IF 12.1
Xue-Tong Yang,Long-Feng Hu,HuiTing Zhang,Huan Lin,Hao Li,Yuelian Peng,Quan-Fu An
The removal of trace volatile organic compounds (VOCs) from water through solar-driven evaporation is crucial for ensuring access to safe drinking water. However, the faster evaporation rate of VOCs compared to water presents a significant challenge in effectively removing these hazardous compounds. To address this issue, a thin polymeric nanoparticle separation membrane is integrated with a photothermal membrane, forming a dual-layer solar evaporator. The bottom layer, a hydrogen-bonding complexed polymer nanoparticle (HCPN) membrane, is fabricated by complexing poly(acrylic acid) and poly(vinylpyrrolidone) into well-dispersed nanoparticles through hydrogen bonding. This HCPN membrane selectively impedes VOC transport while allowing water to pass. The top layer is an in situ-grown photothermal membrane that absorbs solar energy, converting it into heat to drive the water evaporation process. Together, the two layers enable efficient separation and evaporation. This dual-layer solar evaporator demonstrates unprecedented performance, achieving a water evaporation rate of 2.18 kg m −2 h −1 under 1 sun irradiation and over 98% rejection to VOCs. The system maintains stability during 30-h continuous operation and performs effectively under real sunlight conditions. With its high efficiency, stability, and adaptability to real-world conditions, this solar evaporator offers a promising solution for providing safe, clean water in remote and underserved areas.
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PubMed
高影响因子
Separations
·
2024
·Vol. 11
·期 2
·39
·
IF 2.5
Zhenhua Sun,Qingxiang Shu,Qikun Zhang,Shaopeng Li,Ganyu Zhu,Chenye Wang,Jianbo Zhang,Huiquan Li,Zhaohui Huang
ZSM-5 zeolite is a kind of high-value-added porous aluminosilicate zeolite. The use of the coal gasification slag utilization process by-product desilication liquid as a silicon raw material to replace the current raw materials such as water glass will help reduce production costs and achieve high-value utilization of solid waste. ZSM-5 zeolites for volatile organic compounds (VOCs) adsorption were prepared by a one-step hydrothermal method using the desilication solution prepared from coal gasification slag as the main silicon source and sodium source. The effects of crystallization reaction time, the crystallization temperature, the Na2O/SiO2molar ratio, and the SiO2/Al2O3molar ratio on the relative crystallinity and the specific surface area of the ZSM-5 zeolite were investigated and optimized. The optical reaction conditions were as follows: a crystallization time of 12 h, a crystallization temperature of 170 °C, a Na2O/SiO2molar ratio of 0.2, and a SiO2/Al2O3molar ratio of 200. The optimal ZSM-5 zeolite synthesized is hexagonal, with regular grains, a relative crystallinity of 101.48%, a specific surface area of 337.48 m2·g−1, and a pore volume of 0.190 cm3·g−1. And the optimal ZSM-5 zeolite was composed of SiO2content of 97.52 wt%, Al2O3content of 1.58 wt%, Na2O content of 0.33 wt%, and SiO2/Al2O3molar ratio of 104.93. Na2O/SiO2molar ratio is 0.0033. The results of static adsorption experiments show that the static adsorption capacities of ZSM-5 zeolite forp-xylene, benzene, toluene, and butyl acetate were 118.85, 69.98, 68.74, and 95.85 mg·g−1, respectively, which can effectively adsorb VOCs. The synthetic process of the ZSM-5 zeolite is a simple preparation process and short in synthesis time. The results of this study not only help to realize the high-value utilization of silicon components in solid waste, but also provide an economical and effective way to synthesize VOCs adsorption materials.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
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IF 6.434
Muhammad Farooq Mustafa,Xindi Fu,Yanjun Liu,Yawar Abbas,Hongtao Wang,Wenjing Lu
Non-thermal plasma (NTP) an emerging technology to treat volatile organic compounds (VOCs) present in unhygienic point source air streams. In present study, double dielectric barrier discharge (DDBD) reactors were used for the first time to evaluate the removal efficiency of VOCs mixture of different nature at constant experimental conditions (input power 16–65.8 W, VOCs mixture feeding rate 1–6 L/min, 100–101 ppm inlet concentration of individual VOC). Reactor A and B with discharge gap at 6 mm and 3 mm respectively, were used in current study. When treated at an input power of 53.7 W with gas feeding rate of 1 L/min in DDBD reactor A, removal efficiency of the VOCs were: tetrachloroethylene (100%), toluene (100%), trichloroethylene (100%), benzene (100%), ethyl acetate (100%) and carbon disulfide (88.30%); whereas in reactor B, the removal efficiency of all VOCs were 100%. Plasma-catalyst (Pt-Sn/Al 2 O 3 , BaTiO 3 and HZSM-5) synergistic effect on VOCs removal efficiency was also investigated. Highest removal efficiency i.e 100% was observed for each compound with BaTiO 3 and HZSM-5 at an input power 65.8 W. However, integrating NTP with BaTiO 3 and HZSM-5 leads to enhanced removal performance of VOCs mixture with high activity, increase in energy efficiency and suppression of unwanted byproducts.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 27
·期 4
·1179-1190
·
IF 2.183
Wang Hongning,Yang Qinqin,Zhang Zhihui,Song Fujiao,Zhong Jing,Huang Weiqiu,Chen Ruoyu
Organosiliceous nanotubes (OSNs) have been successfully prepared by a reverse micelle, then coated with mixed silica sources of tetraethylorthosilicate (TEOS) and 1,2-bis(triethoxysilyl)ethane, (BTSE). The OSNs were analyzed with different apparatuses and used for volatile organic compounds (VOCs) removal. The static pentane, hexane, benzene, toluene, 92# gasoline and water adsorption behaviors on OSNs and marketable activated carbon (AC) and silica gel (SG) were explored. Experimental results showed that the OSN-35% sample (mass ratio BTSE to (BTSE + TEOS) of 35% in feeding process) was uniform nanotubes with the biggest aspect ratio and pore volume had the best static VOCs adsorption capacity (1.35 g g − 1 , pentane , 1.63 g g − 1 , hexane , 1.68 g g − 1 , benzene , 1.83 g g − 1 , toluene and 0.973 g g − 1 , oil vapor , respectively) and 0.247 g g − 1 , water (the smallest). The dynamic monocomponent n-hexane and toluene adsorption performance on OSN-35% was evaluated via breakthrough curves, and the experimental results showed that OSN-35% had longer breakthrough times ( t b s) and higher adsorption capacities compared with commercial adsorbents, and OSN-35% is water resistant under wet condition. For binary component (n-hexane and toluene) adsorption, the OSN-35% preferred to adsorb toluene. The larger VOCs capacity of OSNs was co-influenced by the introduction of organic groups, aspect ratio and pore volume. The OSNs with enhanced hydrophobicity and VOCs adsorption behaviors and excellent stability are potential for VOCs adsorption application.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Xiao Chen,Zhenglong Zhao,Ying Zhou,Qiulian Zhu,Zhiyan Pan,Hanfeng Lu
This study presents an efficient, economic, and simple preparation strategy for Pt/TiO 2 monolith catalysts. Nano-Pt/TiO 2 dispersion liquid with good activity and stability was synthesized by hydrolysis and chemical reduction method. Various Pt/TiO 2 monolithic catalysts were prepared by spraying the dispersion liquid on different substrates. Results of transmission electron microscopy, scanning electron microscopy, N 2 adsorption-desorption, H 2 temperature-programmed and CO oxidation showed that the Pt/TiO 2 nanoparticles with good mesoporous structure and redox properties were highly dispersed on the substrate. The as-prepared 0.5 Pt/TiO 2 cordierite monolithic catalyst with 0.1 wt‰ Pt content exhibited excellent catalytic combustion activity ( T 90 of toluene combustion was 212 ℃), stability (no deactivation was observed during a 120 h test) and firmness (mass loss was 0.11% after 1 h ultrasonic vibration) under experimental conditions. Compared with state-of-the-art methods, this method is more suitable for large-scale production of waste-gas-treated monolith catalysts. And this method meets the concept of energy saving and emission reduction because of its simplicity, high efficiency, environmental friendliness, and high utilization of active components.
研究领域:
环境科学
·
催化材料
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DOI
高影响因子
Microbiology Spectrum
·
2023
·Vol. 11
·期 3
·
IF 3.7
Kun Wang,Ziyan Lin,Jin Dou,Mingguo Jiang,Naikun Shen,Jing Feng
The role of microbial volatile organic compounds (MVOCs) in promoting plant growth has received much attention. We isolated Paenibacillus peoriae from mangrove rhizosphere soil, which can produce VOCs to promote the growth of Arabidopsis thaliana seedlings, increase the aboveground biomass of A. thaliana, and increase the number of lateral roots of A. thaliana. The effects of different inoculation amounts and different media on the composition of MVOCs were studied by solid-phase microextraction/gas chromatography-mass spectrometry (SPME/GC-MS) and headspace sampler/GC-MS. We found that the growth medium influences the function and composition of MVOCs. To survey the growth-promoting functions, the transcriptome of the receptor A. thaliana was then determined. We also verified the inhibitory effect of the soluble compounds produced by P. peoriae on the growth of 10 pathogenic fungi. The ability of P. peoriae to produce volatile and soluble compounds to promote plant growth and disease resistance has shown great potential for application in the sustainability of agricultural production.IMPORTANCE Microbial volatile organic compounds (MVOCs) have great potential as “gas fertilizers” for agricultural applications, and it is a promising research direction for the utilization of microbial resources. This study is part of the field of interactions between microorganisms and plants. To study the function and application of microorganisms from the perspective of VOCs is helpful to break the bottleneck of traditional microbial application. At present, the study of MVOCs is lacking; there is a lack of functional strains, especially with plant-protective functions and nonpathogenic application value. The significance of this study is that it provides Paenibacillus peoriae, which produces VOCs with plant growth-promoting effects and broad-spectrum antifungal activity against plant-pathogenic fungi. Our study provides a more comprehensive, new VOC component analysis method and explains how MVOCs promote plant growth through transcriptome analysis. This will greatly increase our understanding of MVOC applications as a model for other MVOC research.
研究领域:
微生物学
·
植物科学
·
农业可持续性
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DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Jianfei Yao,Fang Dong,Hua Feng,Zhicheng Tang
To improve the water-resistance under rich moisture condition of the monolithic Co 3 O 4 /NF (Ni-Foam) catalyst for VOCs catalytic combustion, a hydrophobic coating was carefully designed on the monolithic Co 3 O 4 /NF catalyst surface. Through the modulation of the thickness of hydrophobic layer with PhTES (phenyltriethoxysilane), we observed that the thickness of hydrophobic layer on these Co 3 O 4 /NF-x%Ph catalysts could greatly affect its activity in the wet conditions. More importantly, it is confirmed that the construction of the superhydrophobic surface derived from PhTES hugely inhibited the conformation of hydroxyl groups (OH) on the monolithic Co 3 O 4 /NF catalyst, which effectively restrained the adsorption of moisture on monolithic Co 3 O 4 /NF catalyst. Thus, the catalytic activity of toluene under wet condition was improved. In addition, this work also provided new ideas and experimental accumulation for future industrial applications of Co-based catalysts. In addition, in-situ DRIFTS results verified that the construction of hydrophobic layer greatly inhibited the adsorption of water molecules on the surface of the Co 3 O 4 /NF-25%Ph catalyst.
研究领域:
材料科学
·
环境科学
·
催化化学
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产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Xie Dan,Wang Ruimeng,Fu Jinghao,Zhao Zhongxing,Li Min
Surface-enhanced Raman scattering (SERS) is an important and powerful analytical technique in chemical and biochemical analyses. Metal–organic frameworks (MOFs) can effectively capture volatile organic compounds (VOCs) with high adsorption capacity and fast kinetics, and the local surface plasmon resonance characteristics of gold nanoparticles can quickly and effectively distinguish different VOCs by SERS. Combining both, we designed a novel SERS substrate based on embedding gold nanoparticles (AuNPs) within MIL-101(Cr) for the recognition of various VOCs in the gaseous phase. Occupying of AuNPs inside MIL-101(Cr) increased the micropore-specific surface area of AuNPs@MIL-101(Cr), which enabled AuNPs@MIL-101(Cr) to absorb more toluene molecules and consequently realized its high detection sensitivity. The detection limits for toluene, 4-ethylbenzaldehyde, and formaldehyde were down to 6, 5, and 75, ppm respectively. Moreover, this substrate could be used for detecting different VOCs simultaneously. Finally, we discussed the enhancement of AuNPs outside and inside MIL-101(Cr) on the Raman signal.
研究领域:
分析化学
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材料科学
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环境科学
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DOI
PubMed
高影响因子
Processes
·
2023
·Vol. 11
·期 7
·1893
·
IF 3.5
Chenguang An,Xinxin Jiang,Wei Hong,Ye Sun,Tianle Zhu
A series of mesoporous NiO catalysts with high specific surface area were prepared by a simple hydrothermal method and modified by cetyltrimethylammonium bromide (CTAB) as the crystal structure directing regent. The characterization with SEM, XRD, BET, and H2-TPR results demonstrated that the introduction of CTAB effectively improved the dispersion, specific surface area, and pore volume and redox ability of NiO, and thus exposed more active sites. Meanwhile, the NiO catalyst with a CTAB/NiSO4·6H2O molar ratio of 2/3 exhibited the better catalytic ozonation performance of toluene, formaldehyde, methanol, and ethyl acetate than NiO. The in-situ DRIFTS elucidated the reaction path of catalytic ozonation of toluene and indicated that the introduction of CTAB facilitated the complete oxidation of by-products into CO2and H2O.Keywords:catalytic ozonation;typical VOCs;NiO catalyst;CTAB modification
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）