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volatile organic compound Emissions when Drying Wood Particles at High Dewpoints

Chinese Journal of Chemical Engineering 2004年第6期12卷 767-772页

作者： Inge Johansson Tobias Karlsson Roland Wimmerstedt S.E.P. Scandinavian Energy Project AB Bror Nilssons g. 16 SE-417 55 Goteborg SwedenThurne Teknik AB Heliosvagen 1 b SE-120 30 STOCKHOLM SwedenChemical Engineering Lund University P.O. Box 124 SE-221 00 LUND Sweden

Emission of volatile organic compounds (VOCs) during drying of wood particles for particleboard manufacture, or for production of refined biofuels, is a potential environmental problem. The aim of this work is to study the emissions of VOCs during drying, and the influence on the emissions by different drying *** experiments have mainly been done in a batch fluidized bed dryer, but measurements have also been done in a, pilot scale, continuous fluidized bed dryer. The parameters studied are air flow rate through the bed, air temperature, air dewpoint, and bed height. Since the present trend in biofuels and particle drying is towards very high dewpoints during drying, some measurements have been made at dewpoints up to 95℃, corresponding to a water content of 3.2 kg water per kilogram dry air. The emissions have been measured in two different ways,online during drying with a flame ionization detector and through wood analyses of the terpene content in the wood particles before and after drying. Substantial work has been made in developing the latter method as well as developing the drying equipment to be able to produce a wide range of conditions of the drying medium. It was shown that the VOCs emitted, during wood particle drying, mainly consist of terpenes. The behavior of the emissions was typical, at first contact with the drying gas a sharp peak in the release rate was detected. After that,the release rate stabilizes and declines slowly to a point where the material temperature increases and results in a second small peak in the release rate. Typically 80%-90% of the initial terpene content in the material was emitted during drying to low moisture content and it is not possible to significantly influence this release by changing the drying conditions. Up to 50% of the emitted terpenes are released during a very short period after contact with the drying medium. This fact could be utilized by employing a 2-step drying process. The fact that the VOC con

关键词： drying biofuels particleboard volatile organic compound high dewpoints

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Performance of rotating drum biofilter for volatile organic compound removal at high organic loading rates

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Journal of Environmental Sciences 2008年第3期20卷 285-290页

作者： YANG Chunping CHEN Hong ZENG Guangming ZHU Xueqing SUIDAN Makram T College of Environmental Science and Engineering Hunan University Changsha 410082 China Department of Civil and Environmental Engineering University of Cincinnati Cincinnati OH 45221-0071 USA

Uneven distribution of volatile organic compounds （VOCs） and biomass, and excess biomass accumulation in some biofilters hinder the application of biofiltration technology. An innovative multilayer rotating drum biofilter （RDB） was developed to correct these problems. The RDB was operated at an empty bed contact time （EBCT） of 30 s and a rotational rate of 1.0 r/min. Diethyl ether was chosen as the model VOC. Performance of the RDB was evaluated at organic loading rates of 32,1, 64.2, 128, and 256 g ether/（m^3·h）（16.06 g ether/（m^3·h） ≈ 1.0 kg chemical oxygen demand （COD）/（m^3·d））. The EBCT and organic loading rates were recorded on the basis of the medium volume. Results show that the ether removal efficiency decreased with an increased VOC loading rate. Ether removal efficiencies exceeding 99% were achieved without biomass control even at a high VOC loading rate of 128 g ether/（m^3·h）. However, when the VOC loading rate was increased to 256 g ether/（m^3·h）, the average removal efficiency dropped to 43%. Nutrient limitation possibly contributed to the drop in ether removal efficiency. High biomass accumulation rate was also observed in the medium at the two higher ether loading rates, and removal of the excess biomass in the media was necessary to maintain stable performance. This work showed that the RDB is effective in the removal of diethyl ether from waste gas streams even at high organic loading rates. The results might help establish criteria for designing and operating RDBs.

关键词： biofiltration organic loading rotating drum biofilter (RDB) volatile organic compound

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volatile organic compounds in wintertime North China Plain:Insights from measurements of proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)

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Journal of Environmental Sciences 2022年第4期34卷 98-114页

作者： Xianjun He Bin Yuan Caihong Wu Sihang Wang Chaomin Wang Yibo Huangfu Jipeng Qi Nan Ma Wanyun Xu Ming Wang Wentai Chen Hang Su Yafang Cheng Min Shao Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511443China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 511443China State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry of China Meteorology Administration Chinese Academy of Meteorological SciencesBeijing 100081China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Nanjing Intelligent Environmental Science and Technology Co. Ltd.Nanjing 211800China Max Planck Institute for Chemistry Mainz 55128Germany

The characteristics of wintertime volatile organic compounds(VOCs)in the North China Plain(NCP)region are complicated and remain *** measurements were conducted by a proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)at a rural site in the NCP from November to December *** ions measured by PTRToF-MS were quantified and the overall VOC compositions were investigated by combining the measurements of PTR-ToF-MS and gas chromatography-mass spectrometer/flame ionization detector(GC-MS/FID).The measurement showed that although atmospheric VOCs concentrations are often dominated by primary emissions,the secondary formation of oxygenated VOCs(OVOCs)is non-negligible in the wintertime,i.e.,OVOCs accounts for 42%±7%in the total VOCs(151.3±75.6 ppbV).We demonstrated that PTR-MS measurements for isoprene are substantially overestimated due to the interferences of *** chemical changes of organic carbon in a pollution accumulation period were investigated,which suggests an essential role of fragmentation reactions for large,chemically reduced compounds during the heavy-polluted stage in wintertime *** changes of emission ratios of VOCs between winter 2011 and winter 2018 in the NCP support the positive effect of“coal to gas”strategies in curbing air *** high abundances of some key species(*** aromatics)indicate the strong emissions of coal combustion in wintertime of *** ratio of naphthalene to C8 aromatics was proposed as a potential indicator of the influence of coal combustion on VOCs.

关键词： North China Plain volatile organic compound Wintertime PTR-ToF-MS

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Recent Advances of Beta Zeolite in the volatile organic compounds(VOCs)Elimination by the Catalytic Oxidations

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Chemical Research in Chinese Universities 2022年第3期38卷 716-722页

作者： CHENG Dajun MENG Xiangju Beijing Municipal Research Institute of Eco-Environmental Protection Beijing100037P.R.China Key Laboratory of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhou310028P.R.China

volatile organic compounds(VOCs)have become one of the most serious threats to human health and eco-environment due to their volatility,toxicity and diffusivity,*** completely oxidation had been regarded as a highly efficient strategy for the VOCs *** or metal oxides supported on zeolite have been considered as superior catalysts for the treatment of *** them,Beta zeolites have attracted many attentions due to their unique structure and consequently catalytic properties in the oxidation of *** progresses and developments made in the understanding and design of Beta zeolites-based catalysts in the completely oxidation of VOCs in the past two decades have been systematically summarized in this review.

关键词： Beta zeolite volatile organic compound Catalytic oxidation

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Colorimetric Artificial Nose for Identification of Breath volatile organic compounds of Patients with Lung Cancer

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Chemical Research in Chinese Universities 2014年第4期30卷 572-577页

作者： WU Yu HUO Danqun HOU Changjun FA Huanbao YANG Mei LUO Xiaogang Key Laboratory of Biorheology Science and Technology Ministry of Education College of Bioengineering Chongqing University Chongqing 400044 P. R. China Institute of Functional Materials College of Chemistry and Pharmaceutical Engineering Sichuan University of Science and Engineering Zigong 643000 P R. China College of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 P. R China

A novel and highly sensitive colorimetric sensor array was developed for the detection and identification of breath volatile organic compounds（VOCs） of patients with lung *** dimeric metalloporphyrins,metallosalphen complexes,and chemically responsive dyes as the sensing elements,the developed sensor array of artificial nose shows a unique pattern of colorific changes upon its exposure to eight less-reactive VOCs and their mixture gas at a concentration of 735 nmol/L within 3 *** of quantitative analysis of VOCs samples was proved.A good linear relationship of 490-3675 nmol/L was obtained for benzene vapor with a detection limit of 49 nmol/L（S/N=3）.Data analysis was carried out by Hierarchical cluster analysis（HCA） and principal component analysis（PCA）.Each category of breath VOCs clusters together in the PCA score *** errors in classification by HCA were observed in 45 ***,the colorimetric sensor array showed good reproducibility under the cyclic sensing *** results demonstrate that the developed colorimetric artificial nose system is an excellent sensing platform for the identification and quantitative analysis of breath VOCs of patients with lung cancer.

关键词： Dimeric porphyrin Schiff base Colorimetric artificial nose volatile organic compound

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Nafion-Induced Metal-Metal Interactions in a Platinum(II) Terpyridyl Acetylide Complex:a Luminescent Sensor for Detection of volatile organic compounds

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Chinese Journal of Chemistry 2004年第10期22卷 1204-1207页

作者：佟庆笑李晓红吴骊珠杨清正张丽萍佟振合 Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100101 China

The platinum(II) terpyridyl acetylide complex [Pt(terpy)(C≡CR)]ClO4 (terpy=2,2'∶6'2''-terpyridine, R=CH2CH2CH3) (1) was incorporated into Nafion membranes. At high loading the dry membranes exhibit intense photoluminescence with max at 707 nm from the 3MMLCT state, which was not observed in fluid solution. Upon exposure to the vapor of polar volatile organic compounds (VOC), this photoluminescence was significantly red-shifed. This process was fully reversible when the VOC-incorporated membrane was dried in air. The dramatic and reversible changes in the emission spectra made the Nafion-supported complex as an interesting sensor candi-date for polar VOC.

关键词： Nafion membrane platinum(II) terpyridyl acetylide complex metal-metal-to-ligand charge transfer luminescence sensor volatile organic compound

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Identification of breath volatile organic compounds to distinguish pancreatic adenocarcinoma,pancreatic cystic neoplasm,and patients without pancreatic lesions

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World Journal of Gastrointestinal Oncology 2024年第3期16卷 894-906页

作者： Kasenee Tiankanon Nuttanit Pungpipattrakul Thanikan Sukaram Roongruedee Chaiteerakij Rungsun Rerknimitr Division of Gastroenterology Faculty of MedicineChulalongkorn UniversityBangkok 10330Thailand Center of Excellence for Innovation and Endoscopy in Gastrointestinal Oncology King Chulalongkorn Memorial HospitalThai Red Cross SocietyBangkok 10330Thailand

BACKGROUND volatile organic compounds(VOCs)are a promising potential biomarker that may be able to identify the presence of *** To identify exhaled breath VOCs that distinguish pancreatic ductal adenocar-cinoma(PDAC)from intraductal papillary mucinous neoplasm(IPMN)and healthy *** We collected exhaled breath from histologically proven PDAC patients,radiological diagnosis IPMN,and healthy volunteers using the ReCIVA®device between 10/2021-11/*** were identified by thermal desorption-gas chromatography/field-asymmetric ion mobility spectrometry and compared between *** A total of 156 participants(44%male,mean age 62.6±10.6)were enrolled(54 PDAC,42 IPMN,and 60 controls).Among the nine VOCs identified,two VOCs that showed differences between groups were dimethyl sulfide[0.73 vs 0.74 vs 0.94 arbitrary units(AU),respectively;P=0.008]and acetone dimers(3.95 vs 4.49 vs 5.19 AU,respectively;P<0.001).After adjusting for the imbalance parameters,PDAC showed higher dimethyl sulfide levels than the control and IPMN groups,with adjusted odds ratio(aOR)of 6.98(95%CI:1.15-42.17)and 4.56(1.03-20.20),respectively(P<0.05 both).Acetone dimer levels were also higher in PDAC compared to controls and IPMN(aOR:5.12(1.80-14.57)and aOR:3.35(1.47-7.63),respectively(P<0.05 both).Acetone dimer,but not dimethyl sulfide,performed better than CA19-9 in PDAC diagnosis(AUROC 0.910 vs 0.796).The AUROC of acetone dimer increased to 0.936 when combined with CA19-9,which was better than CA19-9 alone(P<0.05).CONCLUSION Dimethyl sulfide and acetone dimer are VOCs that potentially distinguish PDAC from IPMN and healthy *** prospective studies are required to validate these findings.

关键词： volatile organic compound Pancreas Adenocarcinoma Pancreatic intraductal neoplasms Breathing

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Estimation of the Postmortem Interval Using Chromatographic Fingerprints of volatile organic compounds from Muscle

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Journal of Forensic Science and Medicine 2019年第1期5卷 13-19页

作者： Zhiyuan Xia Beibei Liu Haimei Zhou Ping Lv Jinqi Ma Institute of Evidence Law and Forensic Science Key Laboratory of Evidence ScienceChina University of Political Science and LawMinistry of EducationBeijingChina Department of Forensic Medicine Henan University of Science and TechnologyLuoyangHenanChina

Estimation of the postmortem interval(PMI)is a crucial task in the field of forensic pathology and has unfortunately not been properly *** this study,we analyzed volatile organic compounds(VOCs)in rat muscle samples collected at different PMIs and studied the feasibility of muscle VOC fingerprinting as a new method for PMI *** total,110 rats were sacrificed and stored at a constant temperature(25℃).Rat skeletal muscle samples were collected at 0-10‑day postmortem,and then the VOCs were determined using a method of headspace solid‑phase microextraction coupled with gas chromatography‑mass *** correlations between the VOCs(species and quantities)and PMIs were carefully analyzed and standard muscle VOC fingerprints at 25℃were established for different *** further test the accuracy of muscle VOC fingerprinting as a method for PMI estimation,ten additional rats with known PMIs were *** identified 15 kinds of VOCs and the number of VOC species increased with the *** total peak areas of the VOCs increased significantly with the postmortem day(adjusted R^(2)=0.96-0.97).The mean error of the VOC fingerprinting for PMI estimation was 0.5 days and the mean relative error was 8.33%.We concluded that muscle VOC fingerprinting combining the use of VOC species and peak areas is accurate and effective and could be used as an alternative approach for PMI estimation in forensic *** the preliminary results are encouraging,further studies in human cadavers under real case conditions are needed.

关键词： Chromatographic fingerprint gas chromatography‑mass spectrometry muscle postmortem interval solid‑phase microextraction volatile organic compound

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Adsorptive and catalytic properties in the removal of volatile organic compounds over zeolite-based materials

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Chinese Journal of Catalysis 2016年第6期37卷 800-809页

作者：章凌彭悦欣张娟陈龙孟祥举肖丰收浙江大学化学系浙江省应用化学重点实验室浙江杭州310017 东华理工大学化学生物与材料科学学院江西抚州344000

volatile organic compounds（VOCs） are a major component in air pollutants and pose great risks to both human health and environmental protection. Currently, VOC abatement in industrial applications is through the use of activated carbons as adsorbents and oxide-supported metals as catalysts. Notably, activated carbons easily adsorb water, which strongly hinders the adsorption of VOCs; conventional oxides typically possess relatively low surface areas and random pores, which effectively influence the catalytic conversion of VOCs. Zeolites, in contrast with activated carbons and oxides, can be designed to have very uniform and controllable micropores, in addition to tailored wettability properties, which can favor the selective adsorption of VOCs. In particular, zeolites with selective adsorptive properties when combined with catalytically active metals result in zeolite-supported metals exhibiting significantly improved performance in the catalytic combustion of VOCs compared with conventional oxide-supported catalysts. In this review, recent developments on VOC abatement by adsorptive and catalytic techniques over zeolite-based materials have been briefly summarized.

关键词： Air pollution volatile organic compound Zeolite Supported catalyst Catalytic combustion

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Catalytic removal of volatile organic compounds using ordered porous transition metal oxide and supported noble metal catalysts

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Chinese Journal of Catalysis 2016年第8期37卷 1193-1205页

作者：刘雨溪邓积光谢少华王治伟戴洪兴北京工业大学环境与能源工程学院化学化工系绿色催化与分离北京市重点实验室区域大气污染控制北京市重点实验室新型功能材料教育部重点实验室催化化学与纳米科学研究室北京100124

Most of volatile organic compounds （VOCs） are harmful to the atmosphere and human health. Cata‐lytic combustion is an effective way to eliminate VOCs. The key issue is the availability of high per‐formance catalysts. Many catalysts including transition metal oxides, mixed metal oxides, and sup‐ported noble metals have been developed. Among these catalysts, the porous ones attract much attention. In this review, we focus on recent advances in the synthesis of ordered mesoporous and macroporous transition metal oxides, perovskites, and supported noble metal catalysts and their catalytic oxidation of VOCs. The porous catalysts outperformed their bulk counterparts. This excel‐lent catalytic performance was due to their high surface areas, high concentration of adsorbed oxy‐gen species, low temperature reducibility, strong interaction between noble metal and support and highly dispersed noble metal nanoparticles and unique porous structures. Catalytic oxidation of carbon monoxide over typical catalysts was also discussed. We made conclusive remarks and pro‐posed future work for the removal of VOCs.

关键词： volatile organic compound Catalytic combustion Porous transition metal oxide Perovskite-type oxide Supported noble metal catalyst

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