Surfaces and Interfaces
·
2023
·
IF 6.2
Gaoqiang Niu,Yi Zhuang,Yushen Hu,Zong Liu,Bo Wu,Fei Wang
Due to the complicated gas-sensing process on the surface of metal oxide semiconductors (MOS), it is hard to accurately characterize the transient changes of MOS gas sensor. This paper introduces a modified Hill equation to quantitatively analyze the instantaneous resistance of MOS gas sensors operating in temperature-pulsed operation mode, to extract the gas-sensing dynamic features and key parameters for the selective identification of various volatile organic compounds (VOCs) gases (such as ethanol, formaldehyde, toluene and acetone) by machine learning algorithms. The sensors were tested with the pulse-mode at different temperatures for multiple gases. The characteristic features of the sensing process during the pulse-on period were investigated. Key parameters were extracted via the modified Hill equation, which have shown obvious dependence on the gas type and concentration. Excellent selectivity for the VOC gases was attained at low concentrations of 500 ppb thanks to the equation's further integration with the principal component analysis (PCA) approach. The incorporation of this modified Hill equation in temperature-pulsed operation mode provides the vital features for the possible applications of MOS gas sensors with the emerging machine learning algorithm.
研究领域:
传感器技术
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yaqi Wu,Jianhua Qian,Jinjuan Xing,Junhua Li,He Huang,Yanan Wang,Xueming Kang,Lijuan Wang,Jiasheng Xu
Volatile organic compounds (VOCs), as hazardous environmental pollutants emitted from chemical industries, cause significant threats to human health and ecological environment owing to their inherent toxicity and carcinogenicity. Catalytic oxidation has emerged as a promising technology for VOC elimination, enabling complete degradation of pollutants into CO 2 and H 2 O. This study investigates transition metal oxide (TMO x , TM = Mn, Co, Fe, Ni, Cu, Zn)/TiO 2 catalysts for toluene degradation. Since the catalytic efficacy of TiO 2 -based catalysts critically depends on the quantity of surface oxygen vacancy (O v ) in heterogeneous processes, we engineered O v -rich interfaces by breaking atomic periodicity arrangements and generating unsaturated coordination sites. These structural modifications enhanced oxygen migration rates and increased reactive oxygen species availability. Among the synthesized catalysts, CuO/TiO 2 exhibited the highest performance, achieving 90 % toluene conversion (T 90 ) at 286 °C under a weight hourly space velocity (WHSV) of 20,000 mL/(g·h) with an initial toluene concentration of 1000 ppm. The measurement of in-situ DRIFTS suggested that toluene oxidation process abided by the path of toluene → benzaldehyde → benzoic acid → anhydride →CO 2 and H 2 O. Furthermore, the by CuO/TiO 2 catalyst demonstrated great reusability, and long-term stability, highlighting its potential for industrial-scale VOC abatement applications.
研究领域:
环境科学
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催化
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材料科学
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化学工程
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污染控制
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2022
·Vol. 88
·期 6
·
IF 5.005
Yuan Gong,Jia-Qi Liu,Ming-Jie Xu,Chun-Mei Zhang,Jun Gao,Cheng-Guo Li,Ke Xing,Sheng Qin
Volatile organic compounds (VOCs) produced by microorganisms are considered promising environmental-safety fumigants for controlling postharvest diseases. Ceratocystis fimbriata, the pathogen of black spot disease, seriously affects the quality and yield of sweet potato in the field and postharvest. This study tested the effects of VOCs produced by Streptomyces setonii WY228 on the control of C. fimbriata in vitro and in vivo. The VOCs exhibited strong antifungal activity and significantly inhibited the growth of C. fimbriata. During the 20-day storage, VOC fumigation significantly controlled the occurrence of the pathogen, increased the content of antioxidants and defense-related enzymes and flavonoids, and boosted the starch content so as to maintain the quality of the sweet potatoes. Headspace analysis showed that the volatiles 2-ethyl-5-methylpyrazine and dimethyl disulfide significantly inhibited the mycelial growth and spore germination of C. fimbriata in a dose-dependent manner. Fumigation with 100 μL/L 2-ethyl-5-methylpyrazine completely controlled the pathogen in vivo after 10 days of storage. Transcriptome analysis showed that volatiles mainly downregulated the ribosomal synthesis genes and activated the proteasome system of the pathogen in response to VOC stress, while the genes related to spore development, cell membrane synthesis, mitochondrial function, and hydrolase and toxin synthesis were also downregulated, indicating that WY228-produced VOCs have diverse modes of action for pathogen control. Our study demonstrates that fumigation of sweet potato tuberous roots with S. setonii WY228 or use of formulations based on the VOCs is a promising new strategy to control sweet potato and other food and fruit pathogens during storage and shipment.IMPORTANCE Black spot disease caused by Ceratocystis fimbriata has caused huge economic losses to worldwide sweet potato production. At present, the control of C. fimbriata mainly depends on toxic fungicides, and there is a lack of effective alternative strategies. The research on biological control of sweet potato black spot disease is also very limited. An efficient biocontrol technique against pathogens using microbial volatile organic compounds could be an alternative method to control this disease. Our study revealed the significant biological control effect of volatile organic compounds of Streptomyces setonii WY228 on black spot disease of postharvest sweet potato and the complex antifungal mechanism against C. fimbriata. Our data demonstrated that Streptomyces setonii WY228 and its volatile 2-ethyl-5-methylpyrazine could be a candidate strain and compound for the creation of fumigants and showed the important potential of biotechnology applications in the field of food and agriculture.
研究领域:
微生物学
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植物病理学
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食品科学
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农业生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinqi Luan,Xuehui Jia,Syed Jalil Shah,Jingyu Bao,Shunxiang Qin,Ruimeng Wang,Jiguang Deng,Zhongxing Zhao,Zhenxia Zhao
Low adsorption efficiency and secondary pollution release pose a bottleneck for the efficient capture of radioactive iodine vapor during nuclear utilization via adsorption. In addition, the simultaneous adsorption of iodine vapor alongside other harmful vapors in complex systems has been rarely reported. In this work, an electron/H-donating defective pore construction strategy involving MIL-101 modification via amino acids (AAs) was proposed to enhance its simultaneous adsorption efficiency for iodine and formaldehyde vapors. These defective microenvironments possessed microporous property with 11.3 Å, which not only formed strong affinity for I 2 molecules itself but also enhanced its adsorption interaction towards polyiodide anion (I 3 - and I 5 - ) through electron donation of AAs. Moreover, these adsorbed polyiodide anions and AAs-SL within the MOFs, resulting in multisite capture of FA via NH…O-H…I hydrogen bonding. The results revealed that AAs coordinated MIL-101 exhibited superior removal rate ( k 80% = 0.61–1.15 g g −1 h −1 ) for iodine vapor than that of the original MIL-101, which was 3.6–30.8 times higher that of state-of-the-art adsorbents under similar conditions. Notably, a high-capacity superior retention rate of 94.8 % was achieved for its I 2 adsorption after exposure to air for 7 days. After adsorption of iodine, AAs coordinated MIL-101 retained high FA adsorption capacity up to 9.7–12.9 mg/g, representing 75.1 %–87.7 % of the original AAs@MIL adsorption capacity for FA. This defective engineering strategy in MOFs supplied an efficient method for removing multiple harmful gases from the surrounding nuclear waste atmosphere.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Xifeng Zhu,Yuan Liu,Xingliang Ji,Zhaoyang Zhu,Yi Xiao,Tao Wang,Jiawei Wang,Wei-Ping Pan
Emissions from coal-fired or biomass power plants are often released under conditions of high-humidity, posing significant challenges to the effectiveness and durability of adsorbents and catalysts. In industrial settings, adsorbents and catalysts are often deactivated due to water presence, which can block active sites and reduce their effectiveness. Traditional hydrophobic modification methods often cover these adsorption sites, thus reducing a material’s adsorption capacity for volatile organic compounds (VOCs). In this study, we propose a mild physical blending method, incorporating hydrophobic polymer poly(divinylbenzene) (PDVB) with zeolite-templated carbon (ZTC), to regulate the local environment of ZTC for capturing VOCs under humid conditions without damaging the chemical structure of ZTC. Numerous characterization results confirm that incorporating PDVB does not affect the structure of ZTC. The hydrophobic modification increased the adsorption capacity of ZTC by 205% at 15% water content, while the water contact angle increased from 48 to 138°. Vinyl and phenyl groups in PDVB facilitated the rapid repulsion of water molecules from the surface. Molecular dynamics simulations indicated that the hydrophobic channels promoted the desorption of water molecules, and the number of escaped water molecules increased by 286%. Additionally, we propose an industrial application model for large-scale gas emissions with low-concentration VOCs under humid conditions, which enables simultaneous adsorption and desorption, thereby enhancing operational efficiency.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Esimoneze Emmanuel Chinedu,Dilong Qiang,Xueqian Wu,Wei Liu,Haizhou Cao,Zhaolian Ye,Zhen Li,Songjian Zhao
The Pt-based catalyst for purifying chlorinated volatile organic compounds (Cl-VOCs) has the advantages of high catalytic efficiency and low ignition temperature, but the problem of poor resistance to chlorine and water poisoning has not been effectively solved. A series of 0.5 Pt-Ti catalysts were prepared for chlorobenzene (CB) catalytic oxidation by adjusting the interfacial stability and dispersibility of the TiO 2 and Pt through the organic acid strategy in this study. The introduction of tartaric acid (TA) effectively enhanced the surface reduction performance of 0.5Pt-Ti-TA and the proportion of Pt 4+ on the surface. In addition, TA can strongly coordinate with Ti center to form stable titanium-containing complexes, improve the dispersion of Pt, prevent particles from agglomerating, and make the distribution of active sites more uniform. The designed 0.5Pt-Ti-TA exhibits excellent chlorine and water resistance at 300℃ (5 %H 2 O, 500 ppm CB), and has a higher potential of application.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fada Feng,Yikui Zeng,Dengfeng Yan,Quanming Ren,Bang Lan,Jinping Zhong,Biyuan Liu,Tao Dong,Haibao Huang
To clarify the key role of oxygen vacancy defects on enhancing the oxidative activity of the catalysts, metal–organic frameworks (MOFs) derived MnO X catalysts with different morphologies and oxygen vacancy defects were successfully prepared using a facile in-situ self-assembly strategy with different alkali moderators. The obtained morphologies included three-dimensional (3D) triangular cone stacked MnO X hollow sphere (MnO X -H) and 3D nanoparticle stacked MnO X nanosphere (MnO X -N). Compared to MnO X -N, MnO X -H exhibited higher activity for the oxidation of toluene (T 90 = 226 °C). This was mainly due to the large number of oxygen vacancy defects and Mn 4+ species in the MnO X -H catalyst. In addition, the hollow structure of MnO X -H not only facilitated toluene adsorption and activation of toluene and also provided more active sites for toluene oxidation. Reaction mechanism studies showed that the conversion of toluene to benzoate could be realized over MnO X -H catalyst during toluene adsorption at room temperature. In addition, abundant oxygen vacancy defects can accelerate the activated oxidation of toluene and the formation of oxidation products during toluene oxidation.
研究领域:
催化材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shun-Shun Chen,Zi-Yi Shen,Jin-Xuan Song,Ming Tang,Guo-Hui Jiang
The cross-interference of multiple gases and their unknown concentrations in mixed environments renders identifying and determining single-phase gas concentrations in mixed environments a challenge for chemical-resistant metal oxide gas sensors. In this study, a dynamic temperature modulation strategy is proposed, and the temperature-controlled sensitivity behavior of porous SnO 2 nanofibers embedded with Fe 2 O 3 hollow spheres (Fe 2 O 3 @SnO 2 ) as a gas sensor under different frequency modulations is explored. Based on differences in their characteristic curves, linear discriminant analysis was employed to extract features and reduce dimensions. Seven different volatile organic compounds were successfully identified and analyzed. Convolutional neural networks were used to identify certain characteristics and predict the concentrations of single-phase gases in mixed-gas environments. Using training and data validation, seven single-phase gases were successfully separated and identified, with an accuracy of 99.8% for n-butanol. Linear regression analysis was also performed on different gas targets, and the actual concentration was highly consistent with the predicted concentration, rendering the Fe 2 O 3 @SnO 2 gas sensors useful for quantitative analysis.
研究领域:
化学传感
·
纳米材料
·
气体检测
·
机器学习应用
·
环境监测
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Chenglong Yu,Junhui Dan,Zewei Liu,Jinliang Wang,Jiayang Wang,Hansun Fang,Fayin Lai,Danping Li,Lin Li,Fengying Li,Chunhuo Zhou,Bichun Huang
Carbon materials prepared using conventional strategies tend to have serious defects such as low porosity and a single pore structure, which compromise their VOC removal performance. Herein we report on a group of experimental porous carbons that were fabricated using water hyacinth (WH) as the starting material which is abundant in of N and P. The experimental results showed that the HWK-H prepared using a co-hydrothermal method exhibited the best performance in adsorbing methylbenzene with a saturated adsorption capacity of 624.7 mg/g. The results of several characterization tests revealed that HWK-H exhibited a high specific surface area (2199.9 m 2 /g), large pore volume (1.415 cm 3 /g), a specific micro/mesoporous structure, surface functional groups (mainly C = O, C-O and COOH), and a very disordered structure. All these properties were the reason for its superb methylbenzene adsorption performance. DFT calculations showed that the presence of N and P groups in the samples improved the energy of adsorption of the porous carbon materials for methylbenzene, thereby promoting its adsorption. GCMC simulation results also revealed that the carbon's micro/mesoporous pores in the range of 0.45–5.0 nm also facilitated the adsorption of methylbenzene. In addition, the multi-component co-adsorption performance and reusability of HWK-H were evaluated and the results showed that HWK-H offered good prospects for industrial application.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Chenxin Wu,Wei Liu,Jichun Jiang,Yan Wang,Keyong Hou,Haiyang Li
An in-source, helical membrane inlet single photon ionization time-of-flight mass spectrometry (SPI-TOFMS) has been developed to improve the detection sensitivity of trace volatile organic compounds (VOCs) in water. A helical winding membrane and a four-stage differential pumping system of TOFMS was designed to improve and maintain the vapor pressure of analyte, which is linearly associated with the sensitivity of SPI. The helical winding increased the length of the hollow fiber membrane (HFM) from 7 cm to 100 cm and the pressure inside of SPI source was elevated from 3.6 Pa to 28 Pa, and then the sensitivity was increased by 16, 34.7, 32.3, 17.9 and 13.9 times for benzene, ethyl tert-butyl ether (ETBE), aniline, p-xylene, and chlorobenzene (MCBz) respectively. The limits of quantitation (LOQs) of benzene, ETBE, aniline, p-xylene and MCBz were 0.014, 0.143, 0.556, 0.036, 0.025 μg L −1 respectively with a measurement time of 50 s, which were enhanced by more than one order of magnitude compared to our previous work (reference [32]). The in-source design of helical winding membrane i.e. putting the membrane inside the SPI source dramatically reduced the response time to 1.33 min. This system has been evaluated for VOCs in sewage water of different laboratory buildings and automatic monitoring the pollutants in sewage water from a biological laboratory building. The automatic continuous analysis of organic pollutants in water has very important significance and broad application prospect for online assessment of water quality.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xingmin Liu,Jianfeng Zheng,Kun Peng,Guozhen Qin,Yatao Yang,Zhanggen Huang
Constructing effective photocatalysts with visible-light-driven for degrading VOCs including formaldehyde remains a challenge. The TiO 2 (B) photocatalyst with a two-dimensional lamellar structure was prepared and modified by surface engineering. The DFT calculation results showed new impurity levels appeared among the energy bands of the modified TiO 2 (B) materials. These photocatalysts exhibited different rates of HCHO degradation under visible light. A variety of characterizations demonstrated that the surface defects greatly reduced the bandgap and enhanced the absorption of visible light. And the recombination of photogenerated electron-hole (e - -h + ) pairs was suppressed to varying degrees in the modulated TiO 2 (B) catalysts revealed in the photoelectrochemical analysis. It is necessary to match the band structure of photocatalysts with the frontier orbital of HCHO for achieving effectual photocatalytic oxidation (PCO). Remarkably, the separation and transport of photogenerated carriers were inhibited when excessive metal Cu was doped. The results in this work provide a deeper understanding of the relationship between the surface engineering of TiO 2 (B)-based catalysts and catalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Juanqin Xue,Long Shi,Peng Wang,Wen Cheng,Mingyang Long,Mengjiao Sheng,Qiang Bi
The coal chemical industry generates large quantities of volatile organic compounds (VOCs) and solid wastes. Within this work, porous semi-coke activated carbon (SAC) was produced from solid waste semi-coke (SC) powder. Through loading high performance photocatalysts onto SAC to efficiently degrade VOCs using synergistic effects of adsorption and photocatalysis, acheiving the resourcefulness of solid waste. The specific surface area of the prepared SAC can reach 619.27 m 2 .g −1 , which was effective against the adsorption of VOCs. An one-step hydrothermal method was used to load a 2D Z-scheme g-C 3 N 4 -Bi 2 WO 6 (NB) photocatalyst on a semi-coke activated carbon. The 50 wt% NB/SAC material degraded formaldehyde, benzene and toluene up to 93.6%, 84.4% and 78.8% in 130 min under visible light irradiation, being 6.09, 4.55 and 4.75 times higher than that of a single photocatalyst, respectively. The capture experiments showed that hydroxyl radicals (⋅OH) and superoxide radicals (⋅O 2 – ) were the active species in the degradation pathway. The material maintained a high degradation performance of 84.8%, 79.6% and 74.0% even after five cycles. In this study, the mechanism of using SAC as a substrate to enhance performance in photocatalytic degradation was described. The results of this study offered new insights into the resourcefulness of solid waste and the effective degradation of VOCs. It also offered a promising theoretical foundation for the exploitation and utilization of high-performance photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）