• This paper describes the detection of volatile organic compounds (VOCs) using an e-nose system based on a virtual sensor array (VSA). (researchgate.net)
  • Score plots and radar fingerprints obtained respectively from principal component analysis (PCA) and fitted coefficient of adsorption isotherms for each VOC compose sufficient information to successfully discriminate different VOCs. (researchgate.net)
  • A control device that oxidizes volatile organic compounds (VOCs) by using a catalyst to promote the combustion process. (frtr.gov)
  • and c. breakthrough of VOCs in a carbon adsorption unit. (epa.gov)
  • Volatile organic compounds (VOCs) off-gassing from synthetic materials, nitrogen dioxide and harmful outdoor VOCs such benzene, toluene, ethyl-benzene and xylene penetrate into the indoor environment through ventilation and are the main contributors to poor indoor air quality with health effects. (springer.com)
  • Adsorption is one of the most feasible and effective methods to alleviate the volatile organic compounds (VOCs) pollution. (bvsalud.org)
  • However, the mixture effect and mechanism for competitive adsorption of VOCs on zeolites are barely addressed. (bvsalud.org)
  • The results obtained are vital for understanding the mixture effect of VOCs adsorption and may guide the selection of proper adsorbent for real applications. (bvsalud.org)
  • Activated carbon prepared from different types of straw have great differences in structure and adsorption performance. (edu.sa)
  • In order to explore the performance of different straw-based activated carbon in volatile organic compounds adsorption, five common straws were selected as potential source materials for the preparation of SAC. (edu.sa)
  • Among the five straw-based activated carbons, millet straw-derived activated carbon exhibited superior properties in SBET, Smic and adsorption capacities of both toluene and ethyl acetate. (edu.sa)
  • Furthermore, the preparation process of millet straw activated carbon was optimized via response surface methodology, using carbonization temperature, carbonization time and impregnation ratio as variables and toluene adsorption capacity, ethyl acetate adsorption capacity and activated carbon yield as responses. (edu.sa)
  • The optimal preparation conditions include a carbonization temperature of 572◦C, carbonization time of 1.56 h and impregnation ratio (ZnCl2/PM, w/w) of 1.60, which was verified experimentally, resulting in millet straw activated carbon with a toluene adsorption capacity of 321.9 mg/g and ethyl acetate adsorption capacity of 240.4 mg/g. (edu.sa)
  • Meanwhile, the adsorption isothermals and regeneration performance of millet straw activated carbon prepared under the optimized conditions were evaluated. (edu.sa)
  • Recyclability testing has shown that millet straw activated carbon maintained a stable adsorption capacity throughout the second to fifth cycles. (edu.sa)
  • The results of this work indicate that millet straw activated carbon may be a potential volatile organic compound adsorbent for industrial application. (edu.sa)
  • An add-on control device that uses activated carbon to absorb volatile organic compounds from a gas stream. (frtr.gov)
  • The high sensitivity in response, selectivity and reversibility was achieved on a carbon nanowall-based sensor for the vapor detection of volatile organic compounds, which were tested by an electrical resistance method during adsorption and desorption cycles. (rsc.org)
  • An in situ remediation technique applicable to saturated soil and the capillary fringe that consists of blowing pressurized air into saturated soil to cause the volatilization and desorption (stripping) of volatile and semi-volatile organic compounds. (eni.com)
  • We could conclud that TiO₂ thin films can show higher adsorption capacity of toluene comparing to the carbon-based nanostructures due to higher affinity of the surface OH groups of TiO₂ towards toluene adsorption. (e-asct.org)
  • She has experience in the development of fiber polymer composites, waste water treatment and adsorbent preparation for batch and fixed bed adsorption system. (um.edu.my)
  • The structure-property relationship between adsorbate-adsorbent pairs was revealed by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometer, X-ray fluorescence, N2 adsorption and density function theory calculation. (bvsalud.org)
  • Langmuir-Blodgett (LB) thin films using a N,N'-(L-alanine tert-butylester)-3,4:9,10-perylene diimide derivative were prepared to determine the optimum thin film forming conditions and their sensing properties towards volatile organic vapors. (researchgate.net)
  • The fraction of organic vapors generated by a process that are directed to an abatement or recovery device. (frtr.gov)
  • The results show that the carbon nanowalls with average wall distance 100 nm exhibit substantially enhanced electrical response to all volatile organic compound vapors used in comparison with the nanowalls with 300 nm wall distance as well as entangled multiwall carbon nanotube networks. (rsc.org)
  • Both inorganic and organic emerging pollutants, as well as microbial emerging contaminants, are increasingly being considered a crucial threat for ecosystems and for a diversity of living beings, which has resulted in growing efforts and resources dedicated to lines of research in this regard. (mdpi.com)
  • The discrimination effect was enhanced by the non-uniform adsorption of gas molecules on the top, side and bottom regions of the resonator. (researchgate.net)
  • The porous architecture allows adsorption of guest molecules with high efficiency, which is advantageous for rapid detection of the guest molecules. (nature.com)
  • An in situ remediation technique applicable to unsaturated soil that stimulates the biodegradation by native microorganisms (naturally present in the soil) of organic compounds adsorbed into the unsaturated soil by blowing oxygen or air at a low pressure into the soil layers affected by the presence of organic contaminants. (eni.com)
  • Organic materials may be used to produce thin film sensor chips using several techniques. (researchgate.net)
  • Vapochromism is an ability of chromophoric compounds to alter their colour depending on the chemical composition of the surrounding atmosphere. (nature.com)
  • However, the health assessor will find the information in this report useful in characterizing the significance of exposure pathways and the importance of the physical and chemical properties of the lead compounds that may impact on persons' uptake of lead. (cdc.gov)
  • Toward this end, tailored molecular designs have been established for metal-organic, covalent-bonded and hydrogen-bonded frameworks. (nature.com)
  • Loureirin A, B, and C (LA, LB, and LC) are dihydrochalcone compounds isolated from RD. AIM OF THE STUDY: Dehydration is the primary cause of death in rotaviral diarrhea. (bvsalud.org)
  • 1.1 This test method covers the determination of the amount of volatile organic compound (VOC) released from applied solventborne automotive coatings that is available for delivery to a VOC control device. (astm.org)
  • The same general principles apply to waterborne coatings that contain volatile organic compounds (VOC), although specific procedural details are not presented herein to differentiate between VOC and water. (astm.org)
  • Native microorganisms biodegrade hydrocarbon compounds under aerobic conditions, using them as a source of carbon and energy. (eni.com)
  • New equipment for quantitative and qualitative adsorption of volatile organic compound was set up, and using this equipment, adsorption behaviors of various carbob-based nanomaterials and TiO₂ thin films prepared by atomic layer deposition were compared. (e-asct.org)
  • It can be applied in combination (alternating phases) with a Soil Vapour Extraction (SVE) process to ensure the removal of both volatile/semi-volatile and non-volatile hydrocarbon fractions. (eni.com)
  • 4. The date and reason for any maintenance and repair of the applicable control devices and the estimated quantity and duration of volatile organic compound emissions during such activities shall be recorded. (epa.gov)
  • The research team is developing carbon-based sorbent materials to enhance the ability of bacteria to break down mixtures of chlori- nated organic contaminants, such as chloroethene and polychlorinated biphenyls (PCBs), in groundwater and sediments. (nih.gov)
  • By re-engineering carbon materials, they hope to influence the composition of the degrading microbial community and increase their ability to break down halogenated contaminants while also sequestering toxic chemicals that are found in mixtures with halogenated compounds. (nih.gov)
  • Other methods have been published for the determination of specific compounds in air by thermal desorption/gas chromatography [1-3]. (cdc.gov)
  • 4-BFB is used as an agrichemical intermediate, in organic syntheses, and as a tuning, internal, or surrogate standard for gas chromatography-mass spectrometry for the determination of volatile organic compounds in various media. (nih.gov)
  • 1.1 This test method covers the determination of the amount of volatile organic compound (VOC) released from applied solventborne automotive coatings that is available for delivery to a VOC control device. (astm.org)
  • Surface adsorption loss was found to trend with compound water solubility. (nih.gov)
  • We could conclud that TiO₂ thin films can show higher adsorption capacity of toluene comparing to the carbon-based nanostructures due to higher affinity of the surface OH groups of TiO₂ towards toluene adsorption. (e-asct.org)
  • AB - Using computer-aided molecular modeling techniques to analyze models recently proposed for the receptor binding sites of dopaminergic agonists, we superimposed the chemical structures of various compounds that mimic the pharmacological behavior of dopamine, as well as inactive enantiomers, on a postulated three dimensional frame of reference. (nih.gov)
  • 10) Carbon adsorption system --A carbon adsorber with an inlet and outlet for exhaust gases and a system to regenerate the saturated adsorbent. (epa.gov)
  • This compound is used to remove iron, manganese, and arsenic from the water before it re-enters the municipal supply or returns to the environmental source. (demotix.com)
  • 4. Collect a 'humidity test' sample to determine if the thermal adsorption tubes have a high water background. (cdc.gov)
  • The same general principles apply to waterborne coatings that contain volatile organic compounds (VOC), although specific procedural details are not presented herein to differentiate between VOC and water. (astm.org)
  • A 'greener' commercial process for preparing fluorinated aromatic compounds in which water is generated as the only by-product was being developed by scientists at DuPont Central Research and Development. (nih.gov)
  • This model, when expressed as distances from that of the reference compound pergolide, correlates with the dopaminergic binding affinity observed in compounds previously reported to act on the dopaniergic system in the central nervous system (CNS). (nih.gov)
  • for Organic Optoelectronic Materials and KAIST Inst. (osti.gov)
  • By appropriate use of background subtraction, the mass spectrometrist may be able to obtain more representative spectra of each compound and provide a tentative identity (See Table 1). (cdc.gov)
  • The utility model relates to an environmental protection technology field, saying more specifically relates to an organic gas burns device. (google.com)
  • The utility model provides an organic gas burns device of the cross contamination emission of the gas after not having the gaseous of periodic preliminary treatment and handling. (google.com)
  • 9) Carbon adsorber --An add-on control device that uses activated carbon to adsorb volatile organic compounds from a gas stream. (epa.gov)
  • Therefore, the technical problems to be solved in the utility model is to overcome the incinerator of existing product to have periodically The gas of pretreatment with process after gas cross-contamination discharge problem, provide and a kind of do not have periodic pretreatment The organic gas incinerator of the cross-contamination discharge of the gas after gas and process. (google.com)
  • Compounds which coelute on the chromatographic column may present an interference in the identification of each compound. (cdc.gov)
  • Scientists are evaluating a new technology to clean up groundwater contaminated with 1,4-dioxane and chlorinated volatile organic contaminants. (nih.gov)