Journal articles: 'Volatile organic compound degradation'

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Atkinson, Roger, and Janet Arey. "Atmospheric Degradation of Volatile Organic Compounds." Chemical Reviews 103, no. 12 (December 2003): 4605–38. http://dx.doi.org/10.1021/cr0206420.

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Wang, Jing, Wei Li Ong, Jie Hong Ho, and Ghim Wei Ho. "Inorganic-organic Hybrid Membranes for Photocatalytic Hydrogen Generation and Volatile Organic Compound Degradation." Procedia Engineering 215 (2017): 202–10. http://dx.doi.org/10.1016/j.proeng.2017.11.010.

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Gasca-Tirado, J. R., A. Manzano-Ramírez, P. A. Vazquez-Landaverde, E. I. Herrera-Díaz, M. E. Rodríguez-Ugarte, J. C. Rubio-Ávalos, V. Amigó-Borrás, and M. Chávez-Páez. "Ion-exchanged geopolymer for photocatalytic degradation of a volatile organic compound." Materials Letters 134 (November 2014): 222–24. http://dx.doi.org/10.1016/j.matlet.2014.07.090.

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Mora, Lucas D., Larissa F. Bonfim, Lorrana V. Barbosa, Tiago H. da Silva, Eduardo J. Nassar, Katia J. Ciuffi, Beatriz González, et al. "White and Red Brazilian São Simão’s Kaolinite–TiO2 Nanocomposites as Catalysts for Toluene Photodegradation from Aqueous Solutions." Materials 12, no. 23 (November 28, 2019): 3943. http://dx.doi.org/10.3390/ma12233943.

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The presence of volatile organic compounds in groundwater is a major concern when it is used as a drinking water source because many of these compounds can adversely affect human health. This work reports on the preparation and characterization of white and red Brazilian São Simão’s kaolinite-TiO2 nanocomposites and their use as catalysts in the photochemical degradation of toluene, a significant volatile organic compound. The nanocomposites were prepared by a sol-gel procedure, using titanium bis(triethanolaminate)diisopropoxide as a precursor. Thermal treatments of the nanocomposites led to different polymorphic titania phases, while the clay changed from kaolinite to metakaolinite. This structural evolution strongly affected the photocatalytic degradation behavior—all the solids efficiently degraded toluene and the solid calcined at 400 °C, formed by kaolinite and anatase, showed the best behavior (90% degradation). On extending the photochemical treatment up to 48 h, high mineralization levels were reached. The advantage of photodegradation using the nanocomposites was confirmed by comparing the results from isolated components (titanium dioxide and kaolinite) to observe that the nanocomposites displayed fundamental importance to the photodegradation pathways of toluene.

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Lomans, B. P., A. Pol, and H. J. M. Op den Camp. "Microbial cycling of volatile organic sulfur compounds in anoxic environments." Water Science and Technology 45, no. 10 (May 1, 2002): 55–60. http://dx.doi.org/10.2166/wst.2002.0288.

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Microbial cycling of volatile organic sulfur compounds (VOSC) is investigated due to the impact these compounds are thought to have on environmental processes like global temperature control, acid precipitation and the global sulfur cycle. Moreover, in several kinds of industries like composting plants and the paper industry VOSC are released causing odor problems. Waste streams containing these compounds must be treated in order to avoid the release of these compounds to the atmosphere. This paper describes the general mechanisms for the production and degradation of methanethiol (MT) and dimethyl sulfide (DMS), two ubiquitous VOSC in anaerobic environments. Slurry incubations indicated that methylation of sulfide and MT resulting in MT and DMS, respectively, is one of the major mechanisms for VOSC in sulfide-rich anaerobic environments. An anaerobic bacterium that is responsible for the formation of MT and DMS through the anaerobic methylation of H2S and MT was isolated from a freshwater pond after enrichment with syringate as a methyl group donating compound and sole carbon source. In spite of the continuous formation of MT and DMS, steady state concentrations are generally very low. This is due to the microbial degradation of these compounds. Experiments with sulfate-rich and sulfate-amended sediment slurries demonstrated that besides methanogens, sulfate-reducing bacteria can also degrade MT and DMS, provided that sulfate is available. A methanogen was isolated that is able to grow on DMS as the sole carbon source. A large survey of sediments slurries of various origin demonstrated that both isolates are commonly occurring inhabitants of anaerobic environments.

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Chiarelotto, Maico, Willian Chucchi Bottin, Cristian Eduardo Spicker, Savio Silva Duarte, Marilete Chiarelotto, and Marlene Magnoni Bortoli. "Composting of household organic waste: effect on control parameters and final compound quality." REVISTA AGRO@MBIENTE ON-LINE 12, no. 4 (December 30, 2018): 272. http://dx.doi.org/10.18227/1982-8470ragro.v12i4.5126.

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It is estimated that 51% of Brazilian urban solid waste is composed of organic material, which has a high recyclability potential via alternative processes. One means of optimization and recycling this fraction would be the popularization of household composting and the dissemination of means of attaining it. The current study objective, therefore, was to evaluate control characters of the household organic residue composting process, test final organic compound product quality and investigate the feasibility of conducting such processes in urban dwellings. Organic residues were collected for three days, distributed over a week, in 20 residences of the urban area of Marmeleiro municipality, Paraná State, southern Brazil. A compost heap was set up with an initial mass of 137.21 kg of organic material. During the degradation process, temperature, dry mass, volume, pH, electrical conductivity, phytotoxicity, volatile solids, total organic carbon exothermic accumulation, and loss of organic matter were measured. At the end of the process, the CTC, CTC:COT, total nitrogen and C:N ratio were also determined. Throughout the composting process it was recorded that the germination index went from 45.27 to 109.43, as the material changed from being dominated by phytotoxic compounds to phytostimulants. In addition, organic compound CTC increased from 27.2 to 57.8, showing organic material degradation occurred in only 37 days. The experimental analysis of the degradation process, has shown that treatment of urban organic waste in compost heaps is both viable and safe under domestic circumstances.

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Cline, Patricia V., and Daniel R. Viste. "Migration and Degradation Patterns of Volatile Organic Compounds." Waste Management & Research 3, no. 1 (January 1985): 351–60. http://dx.doi.org/10.1177/0734242x8500300143.

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CLINE, P., and D. VISTE. "Migration and degradation patterns of volatile organic compounds." Waste Management & Research 3, no. 4 (1985): 351–60. http://dx.doi.org/10.1016/0734-242x(85)90128-4.

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ZUO, G., Z. CHENG, H. CHEN, G. LI, and T. MIAO. "Study on photocatalytic degradation of several volatile organic compounds." Journal of Hazardous Materials 128, no. 2-3 (February 6, 2006): 158–63. http://dx.doi.org/10.1016/j.jhazmat.2005.07.056.

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Wojtasik-Kalinowska, Iwona, Arkadiusz Szpicer, Weronika Binkowska, Monika Hanula, Monika Marcinkowska-Lesiak, and Andrzej Poltorak. "Effect of Processing on Volatile Organic Compounds Formation of Meat—Review." Applied Sciences 13, no. 2 (January 4, 2023): 705. http://dx.doi.org/10.3390/app13020705.

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Meat is a rich source of different volatile compounds. The final flavor of meat products depends on the raw material and processing parameters. Changes that occur in meat include pyrolysis of peptides and amino acids, degradation of sugar and ribonucleotides, Maillard’s and Strecker’s reactions, lipid oxidation, degradation of thiamine and fats, as well as microbial metabolism. A review of the volatile compounds’ formation was carried out and divided into non-thermal and thermal processes. Modern and advanced solutions such as ultrasounds, pulsed electric field, cold plasma, ozone use, etc., were described. The article also concerns the important issue of determining Volatile Organic Compounds (VOCs) markers generated during heat treatment.

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Fu, Yujie, You Zhang, Qi Xin, Zhong Zheng, Yu Zhang, Yang Yang, Shaojun Liu, Xiao Zhang, Chenghang Zheng, and Xiang Gao. "Non-Thermal Plasma-Modified Ru-Sn-Ti Catalyst for Chlorinated Volatile Organic Compound Degradation." Catalysts 10, no. 12 (December 13, 2020): 1456. http://dx.doi.org/10.3390/catal10121456.

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Chlorinated volatile organic compounds (CVOCs) are vital environmental concerns due to their low biodegradability and long-term persistence. Catalytic combustion technology is one of the more commonly used technologies for the treatment of CVOCs. Catalysts with high low-temperature activity, superior selectivity of non-toxic products, and resistance to chlorine poisoning are desirable. Here we adopted a plasma treatment method to synthesize a tin-doped titania loaded with ruthenium dioxide (RuO2) catalyst, possessing enhanced activity (T90%, the temperature at which 90% of dichloromethane (DCM) is decomposed, is 262 °C) compared to the catalyst prepared by the conventional calcination method. As revealed by transmission electron microscopy, X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, and hydrogen temperature-programmed reduction, the high surface area of the tin-doped titania catalyst and the enhanced dispersion and surface oxidation of RuO2 induced by plasma treatment were found to be the main factors determining excellent catalytic activities.

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Jafarikojour, Morteza, Morteza Sohrabi, Sayed Javid Royaee, and Mohammad Rezaei. "Residence time distribution analysis and kinetic study of toluene photo-degradation using a continuous immobilized photoreactor." RSC Adv. 4, no. 95 (2014): 53097–104. http://dx.doi.org/10.1039/c4ra05239k.

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13

Ebrahimi, Hossein, Farshid Ghorbani Shahna, Abdulrahman Bahrami, Babak Jaleh, and Kamal ad-Din Abedi. "Photocatalytic degradation of volatile chlorinated organic compounds with ozone addition." Archives of Environmental Protection 43, no. 1 (March 1, 2017): 65–72. http://dx.doi.org/10.1515/aep-2017-0006.

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Abstract The decomposition of hydrocarbons using combined advanced oxidation methods is largely considered owing to abundant production of OH radicals and the potential economic advantages. In this study, the synergetic effect of ozonation on photocatalytic oxidation of chloroform and chlorobenzene over expanded graphite-TiO2&ZnO Nano composite was investigated. The effect of introduced ozone concentration and residence time was also examined on removal efficiency. The results showed that the removal efficiency was significantly enhanced by the combined system resulting from the additional oxidation process causing active species to be increased. Increasing the introduced ozone concentration which generates more reactive compounds had a greater effect on the removal efficiency than that of residence time. However, from the mineralization point of view, the residence time had a dominant effect, and the selectivity towards CO2 was dramatically declined when the flow rate increased. Based on these results, the combined system is preferred due to higher removal efficiency and complete mineralization.

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Huang, Kun-Chang, Zhiqiang Zhao, George E. Hoag, Amine Dahmani, and Philip A. Block. "Degradation of volatile organic compounds with thermally activated persulfate oxidation." Chemosphere 61, no. 4 (October 2005): 551–60. http://dx.doi.org/10.1016/j.chemosphere.2005.02.032.

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Gu, Zhen Yu, Zhong Zhong, Zhi Qiu, Fu Cheng Sun, and Zong Lin Zhang. "Potential for Persulfate Degradation of Semi Volatile Organic Compounds Contamination." Advanced Materials Research 651 (January 2013): 109–14. http://dx.doi.org/10.4028/www.scientific.net/amr.651.109.

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Semi Volatile Organic Compounds (SVOCs) are common contaminants found in brownfield sites that used to be agrochemical plants, chemical storage sites, and industrial areas. Chemical oxidation showed great potential to provide a rapid, cost-effective approach for SVOCs contaminate sites. Chemical oxidation using persulfate was demonstrated by degrading both lab samples and on-site samples from a local o-ansidine contaminated site in this study. The soil samples were mixed with persulfate at different ratios, while adding supplements for the purpose of persulfate thermal activation and pH control. Experiments for optimal usage and treatment duration were also investigated to provide guidance for following demonstration project. Soil samples were analyzed before and after the treatments to compare the o-ansidine concentration changes. The results suggested an optimal ratio of persulfate at 0.5% (in w/w) for this study, with 90% or more removal of most samples in 3 days, at an average cost of oxidants per ton of soil around 800 RMB. This study demonstrated the potential of persulfate oxidation as a novel and reliable approach for o-ansidine contaminated soil, as well as the possibility of extending the remediation concept for other organic contamination scenarios. In addition, persulfate oxidation could also be combined with other remediation technology in future due to its simplicity and convenience.

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Shao, Jiaming, Yunchu Zhai, Luyang Zhang, Li Xiang, and Fawei Lin. "Low-Temperature Catalytic Ozonation of Multitype VOCs over Zeolite-Supported Catalysts." International Journal of Environmental Research and Public Health 19, no. 21 (November 4, 2022): 14515. http://dx.doi.org/10.3390/ijerph192114515.

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Volatile organic compounds (VOCs) are an important source of air pollution, harmful to human health and the environment, and important precursors of secondary organic aerosols, O3 and photochemical smog. This study focused on the low-temperature catalytic oxidation and degradation of benzene, dichloroethane, methanethiol, methanol and methylamine by ozone. Benzene was used as a model compound, and a molecular sieve was selected as a catalyst carrier to prepare a series of supported active metal catalysts by impregnation. The effects of ozone on the catalytic oxidation of VOCs and catalysts’ activity were studied. Taking benzene as a model compound, low-temperature ozone catalytic oxidation was conducted to explore the influence of the catalyst carrier, the active metal and the precious metal Pt on the catalytic degradation of benzene. The optimal catalyst appeared to be 0.75%Pt–10%Fe/HZSM(200). The catalytic activity and formation of the by-products methylamine, methanethiol, methanol, dichloroethane and benzene over 0.75%Pt–10%Fe/HZSM(200) were investigated. The structure, oxygen vacancy, surface properties and surface acidity of the catalysts were investigated. XRD, TEM, XPS, H2-TPR, EPR, CO2-TPD, BET, C6H6-TPD and Py-IR were combined to establish the correlation between the surface properties of the catalysts and the degradation activity.

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Villaverde, S., F. Fdz-Polanco, and P. A. García Encina. "Endogenous respiration rate in vapour phase biological reactors (VPBRs) during volatile organic compound (VOC) degradation." Water Science and Technology 42, no. 5-6 (September 1, 2000): 429–36. http://dx.doi.org/10.2166/wst.2000.0545.

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Endogenous respiration rates within Pseudomonas putida biofilms growing on toluene and ethanol as sole external carbon source were evaluated using oxygen microelectrodes in a Flat Plate Vapour Phase Biological Reactor (FPVPBR). The endogenous respiration was experimentally evaluated in Pseudomonas putida 54G biofilm cultures growing on toluene and ethanol, by measuring the flux of oxygen through the liquid-biofilm interface in absence of any external carbon source. Two fluorescent probes, 2,4-diamidino-2-phenylindole (DAPI) and 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) were used to evaluate the number of total and respiring cells within the biofilm, respectively. Biofilm samples were also analysed for viable and VOC-culturable cells by spread plating on non-selective and selective media, respectively. Results suggest that endogenous respiration rate may contribute significantly to the oxygen requirements of the overall process and, consequently, affect the performance of the VPBR degrading VOCs. In the time the biofilm growing process at expenses of VOCs may deviate towards serious cryptic growth and endogenous metabolism. The endogenous respiration within the biofilm is a function of the VOC concentration and in last term of the injury phenomena that may act as regulatory mechanism of the biofilm thickness and density, which might justify the absence of plugging phenomena in VPBR. As the VOC concentration increases, the injury increases, meaning increasing intracellular material leakage and injured cell death resulting in lysis products. These observations can justify the unusually long operation periods characterizing VOC vapours biofiltration units.

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Kim, Hyoung-il, Seunghyun Weon, Homan Kang, Anna L. Hagstrom, Oh Seok Kwon, Yoon-Sik Lee, Wonyong Choi, and Jae-Hong Kim. "Plasmon-Enhanced Sub-Bandgap Photocatalysis via Triplet–Triplet Annihilation Upconversion for Volatile Organic Compound Degradation." Environmental Science & Technology 50, no. 20 (September 29, 2016): 11184–92. http://dx.doi.org/10.1021/acs.est.6b02729.

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Noguchi, Miyuki, and Akihiro Yamasaki. "Volatile and semivolatile organic compound emissions from polymers used in commercial products during thermal degradation." Heliyon 6, no. 3 (March 2020): e03314. http://dx.doi.org/10.1016/j.heliyon.2020.e03314.

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Zhang, Luqian, Chen Wang, Jing Sun, and Zhengkai An. "Trimesoyl Chloride-Melamine Copolymer-TiO2 Nanocomposites as High-Performance Visible-Light Photocatalysts for Volatile Organic Compound Degradation." Catalysts 10, no. 5 (May 20, 2020): 575. http://dx.doi.org/10.3390/catal10050575.

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Benzene is a typical volatile organic compound (VOC) and is found widely in industrial waste gases. In this study, trimesoyl chloride-melamine copolymer (TMP)-TiO2 nanocomposites with excellent photocatalytic efficiency in visible-light degradation of gas-phase benzene were synthesized via an in situ hydrothermal synthesis. The optimal conditions for TMP-TiO2 nanocomposite synthesis were determined by orthogonal experiments. The structural, physiochemical, and optoelectronic properties of the samples were studied by various analytical techniques. Ultraviolet-visible diffuse reflectance spectroscopy and surface photovoltage spectra showed that the positions of the light-absorbance edges of the TMP-TiO2 nanocomposites were sharply red-shifted to the visible region relative to those of unmodified TiO2. The most efficient TMP-TiO2 nanocomposite was used for photocatalytic oxidative degradation of gas-phase benzene (initial concentration 230 mg m−3) under visible-light irradiation (380–800 nm); the degradation rate was 100% within 180 min. Under the same reaction conditions, the degradation rates of unmodified TiO2 (hydrothermally synthesized TiO2) and commercial material Degussa P25 were 19% and 23.6%, respectively. This is because the Ti–O–N and Ti–O–C bonds in TMP-modified TiO2 reduce the band gap of TMP-TiO2. The amide bonds in the TMP decrease the TiO2 nanoparticle size and thus increased the specific surface area. The conjugated structures in the TMP provide abundant active sites for trapping photogenerated electrons and promote the separation and transfer of photogenerated electrons and holes.

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Milde, G., M. Nerger, and R. Mergler. "Biological Degradation of Volatile Chlorinated Hydrocarbons in Groundwater." Water Science and Technology 20, no. 3 (March 1, 1988): 67–73. http://dx.doi.org/10.2166/wst.1988.0083.

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Chlorinated organic solvents - such as tetrachloroethene, trichloroethene and 1.1.1-trichloroethane - are the most frequently used compounds e.g. for degreasing in all branches of industries. Due to their widespread use, their large consumption quantities (Fed.Rep.of Germ. 180 × 103 t/a) and their physical properties, these organic solvents are the most important point-source of groundwater contamination. A serious case of soil, soil air and groundwater contamination by these organic solvents (maximum concentrations detected were 500 mg/kg, 7g/m3, 50 mg/l respectively) is reported, caused by the metal industry, rendering plant and paper production. A special effect is the comparatively rapid degradation sequence of tetrachloroethene to trichloroethene to cis-1,2-dichloroethene and to vinyl chloride. Concentrations of cis-1,2-dichloroethene observed in groundwater were up to 1600 µg/l and of vinyl chloride up to 120 µg/l, respectively, although none of these substances were primary pollutants in the investigated area. Results of laboratory tests give rise to the suggestion that degradation of chlorinated hydrocarbons in contaminated areas is mainly by microbiological means. This effect is of special hygienic relevance, due to the fact that one of the metabolites, vinyl chloride, is known to be a human carcinogen and the polluted area (approx. 4 km2) is located in a catchment area of a waterworks.

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Maxwell, Tyler, Richard Blair, Yuemin Wang, Andrew Kettring, Sean Moore, Matthew Rex, and James Harper. "A Solvent-Free Approach for Converting Cellulose Waste into Volatile Organic Compounds with Endophytic Fungi." Journal of Fungi 4, no. 3 (August 26, 2018): 102. http://dx.doi.org/10.3390/jof4030102.

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Simple sugars produced from a solvent-free mechanocatalytic degradation of cellulose were evaluated for suitability as a growth medium carbon source for fungi that produce volatile organic compounds. An endophytic Hypoxylon sp. (CI-4) known to produce volatiles having potential value as fuels was initially evaluated. The growth was obtained on a medium containing the degraded cellulose as the sole carbon source, and the volatile compounds produced were largely the same as those produced from a conventional dextrose/starch diet. A second Hypoxylon sp. (BS15) was also characterized and shown to be phylogenetically divergent from any other named species. The degraded cellulose medium supported the growth of BS15, and approximately the same quantity of the volatile compounds was produced as from conventional diets. Although the major products from BS15 grown on the degraded cellulose were identical to those from dextrose, the minor products differed. Neither CI-4 or BS15 exhibited growth on cellulose that had not been degraded. The extraction of volatiles from the growth media was achieved using solid-phase extraction in order to reduce the solvent waste and more efficiently retain compounds having low vapor pressures. A comparison to more conventional liquid–liquid extraction demonstrated that, for CI-4, both methods gave similar results. The solid-phase extraction of BS15 retained a significantly larger variety of the volatile compounds than did the liquid–liquid extraction. These advances position the coupling of solvent-free cellulose conversion and endophyte metabolism as a viable strategy for the production of important hydrocarbons.

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KHAMI, Sunun, Wipawee KHAMWICHIT, Ratthapol RANGKUPAN, and Kowit SUWANNAHONG. "Volatile Organic Compound (VOC) Removal via Photocatalytic Oxidation Using TiO2 Coated Nanofilms." Walailak Journal of Science and Technology (WJST) 15, no. 7 (June 21, 2017): 491–501. http://dx.doi.org/10.48048/wjst.2018.3143.

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In this paper, toluene removal via photocatalytic oxidation using TiO2 dip coated nanofilms is presented. Nanofilms were synthesized from bacterial cellulose using the electrospinning technique. The physical properties of the nanofilms were analyzed by scanning electron microscopy (SEM). The ratio of bacterial cellulose/nylon used in the spinning process was 0.165:1. The results from SEM showed that the structure of the TiO2 composite nanofilms was rutile crystalline with an average particle size of 20 nm, and synthesized nanofilms had an average size of 20 - 30 nm. The band gap energies of TiO2-dip coated nanofilms ranged from 3.18 - 3.21 eV. SEM results of TiO2 coated nanofilms suggested that the TiO2 was rather uniformly distributed onto the surface of the nanofilms. The actual amount of TiO2 coated on the nanofilms was estimated using thermogravimetric analysis (TGA) for 1x1 cm2 surface area. It was found that 0.1852, 0.2897 and 0.7275 mg of TiO2 were coated on the surface of the nanofilms for 1, 2.5 and 5 % (weight) TiO2 dosage, respectively. The photocatalytic activity of the nanofilms was tested for the removal of gaseous toluene in a photocatalytic reactor. Experimental conditions were set as follows: UV light intensity of approximately 2.7 mW.cm-2, flow rate of 0.2 L.min-1, and an initial toluene concentration of about 200±20 ppm, and a retention time at 200 min. The degradation rate of toluene increased with increasing dosage of TiO2 from 1, 2.5 and 5 %. The nanofilms at a 5 % dosage yielded the highest removal efficiency of 92.71 %, followed by the 2.5 and 1 % dosage, respectively.

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Auer, Nicole R., and Detlef E. Schulz-Bull. "Stable Carbon Isotope Analysis of Anthropogenic Volatile Halogenated C1 and C2 Organic Compounds." Environmental Chemistry 3, no. 4 (2006): 268. http://dx.doi.org/10.1071/en06027.

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Environmental Context.Volatile halogenated organic compounds (VHOCs), ubiquitous trace gases of natural or man-made origin, have gained increasing attention due to their adverse health effects on humans and wildlife, and their potential for catalytic ozone destruction. However, it is difficult to confront VHOC emission budgets as the processes responsible for the formation and degradation of these compounds are complex, and their emission and persistence are affected by variations in the environment and climate. In order to understand VHOCs and reduce their environmental impact, it is necessary to study the isotopic composition of VHOCs produced by different sources, in addition to their concentrations and fluxes in the environment. In this paper, the determination of the carbon isotope range of VHOCs produced by human activities adds useful basic information for future studies of their environmental fate. Abstract. This paper presents the C13/C12 determination of 27 industrial volatile halogenated organic compounds (VHOCs) from different suppliers via gas chromatography combustion isotope-ratio mass spectrometry (GC-C-IRMS). A total of 60 samples, containing one or two carbon atoms, plus chlorine, bromine and iodine substituents, were analyzed to provide a basis for their further comparison with naturally produced VHOC δ13C values. The results indicate a wide range in the carbon isotope signature (–62‰ and –5‰). For chloroiodomethane alone, positive carbon isotope values of 33‰ (Fluka) and 59‰ (VWR International) were found. Each C1 and C2 compound has a distinctive carbon isotope composition, depending on the individual manufacturing reactions, the use of different carbon sources, differences in the composition of the same type of raw material and/or conditions during the manufacturing process. The last two factors are probably responsible for the δ13C discrepancies of ~5‰ found between manufacturers of the same compound. Larger deviations are mainly associated with different carbon isotope signatures of the reactant. Therefore, it is suggested that the reporting of a stable carbon isotope ratio for an anthropogenic VHOC include details of the manufacturing process or alternatively the supplier.

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Liu, Gaoyuan, Haibao Huang, Ruijie Xie, Qiuyu Feng, Ruimei Fang, Yajie Shu, Yujie Zhan, Xinguo Ye, and Cheng Zhong. "Enhanced degradation of gaseous benzene by a Fenton reaction." RSC Advances 7, no. 1 (2017): 71–76. http://dx.doi.org/10.1039/c6ra26016k.

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A wet scrubbing process coupled with advanced oxidation processes (AOP) has raised great interest for the abatement of volatile organic compounds (VOCs) owing to its strong oxidation capacity and few byproducts.

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Hădărugă, Daniel I., Nicoleta G. Hădărugă, Corina I. Costescu, Ioan David, and Alexandra T. Gruia. "Thermal and oxidative stability of the Ocimum basilicum L. essential oil/β-cyclodextrin supramolecular system." Beilstein Journal of Organic Chemistry 10 (November 28, 2014): 2809–20. http://dx.doi.org/10.3762/bjoc.10.298.

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Ocimum basilicum L. essential oil and its β-cyclodextrin (β-CD) complex have been investigated with respect to their stability against the degradative action of air/oxygen and temperature. This supramolecular system was obtained by a crystallization method in order to achieve the equilibrium of complexed–uncomplexed volatile compounds in an ethanol/water solution at 50 °C. Both the raw essential oil and its β-CD complex have been subjected to thermal and oxidative degradation conditions in order to evaluate the protective capacity of β-CD. The relative concentration of the O. basilicum L. essential oil compounds, as determined by GC–MS, varies accordingly with their sensitivity to the thermal and/or oxidative degradation conditions imposed. Furthermore, the relative concentration of the volatile O. basilicum L. compounds found in the β-CD complex is quite different in comparison with the raw material. An increase of the relative concentration of linalool oxide from 0.3% to 1.1%, in addition to many sesquiterpene oxides, has been observed. β-CD complexation of the O. basilicum essential oil modifies the relative concentration of the encapsulated volatile compounds. Thus, linalool was better encapsulated in β-CD, while methylchavicol (estragole) was encapsulated in β-CD at a concentration close to that of the raw essential oil. Higher relative concentrations from the degradation of the oxygenated compounds such as linalool oxide and aromadendren oxide were determined in the raw O. basilicum L. essential oil in comparison with the corresponding β-CD complex. For the first time, the protective capability of natural β-CD for labile basil essential oil compounds has been demonstrated.

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Bejan, Iustinian Gabriel, Romeo-Iulian Olariu, and Peter Wiesen. "Secondary Organic Aerosol Formation from Nitrophenols Photolysis under Atmospheric Conditions." Atmosphere 11, no. 12 (December 11, 2020): 1346. http://dx.doi.org/10.3390/atmos11121346.

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Nitrophenols are important products of the aromatic compounds photooxidation and play a considerable role in urban chemistry. Nitrophenols are important components of agricultural biomass burning that could influence the climate. The formation of secondary organic aerosol from the direct photolysis of nitrophenols was investigated for the first time in a quartz glass simulation chamber under simulated solar radiation. The results from these experiments indicate rapid SOA formation. The proposed mechanism for the gas-phase degradation of nitrophenols through photolysis shows the formation of biradicals that could react further in the presence of oxygen to form low volatile highly oxygenated compounds responsible for secondary organic aerosol formation. The inhibiting effect of NOx and the presence of an OH radical scavenger on the aerosol formation were also studied. For 2-nitrophenol, significant aerosol formation yields were observed in the absence of an OH radical scavenger and NOx, varying in the range of 18%–24%. A gas-phase/aerosol partitioning model was applied assuming the presence of only one compound in both phases. A degradation mechanism is proposed to explain the aerosol formation observed in the photolysis of nitrophenols. The atmospheric impact of nitrophenol photolysis is discussed and the importance for atmospheric chemical models is assessed.

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Webber, M. D., J. D. Goodin, P. J. A. Fowlie, R. L. Hong-You, and J. Legault. "Persistence of Volatile Organic Compounds in Sludge Treated Soils." Water Quality Research Journal 32, no. 3 (August 1, 1997): 579–98. http://dx.doi.org/10.2166/wqrj.1997.034.

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Abstract Laboratory incubation studies were conducted to assess the persistence of ten volatile organic compounds (VOCs) in seven soils treated with 3% dw of anaer-obically digested municipal sludge. The VOCs were probable municipal sludge contaminants and the soils represented wide ranges of constituents likely to sorb organic compounds, e.g., organic carbon (1.3 to 12%) and clay (7 to 50%). The VOCs were spiked into soils at 50 mg kg-1 dw of soil, except for trichloro-ethylene and chloroform which were at 2.5 mg kg-1 dw. Three general patterns of VOC losses from soils were identified: (1) complete volatilization at room temperature within 24 h, (2) complete volatilization/degradation within 144 to 288 h, and (3) incomplete volatilization/degradation within 288 h. All VOC losses were consistent with first-order kinetics and indicated a combination of a rapid initial kinetic (0 to 4 h) followed by a slower kinetic. The slower kinetic was assumed to be more relevant to field VOC losses than the rapid kinetic, and first-order half-lives were calculated using the 4- to 288-h experimental data. The half-lives ranged from 5.5 to 1,926 h with a median value of 70 h, and generally increased with increasing boiling points of the VOCs and with increasing organic carbon contents of the soils. These laboratory findings indicate that VOCs in land-applied sludge are unlikely to represent a hazard to agriculture.

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Tharasawatpipat, Chaisri, Jittiporn Kruenate, Kowit Suwannahong, and Torpong Kreetachat. "Modification of Titanium Dioxide Embedded in the Bio-Composite Film for Photocatalytic Oxidation of Chlorinated Volatile Organic Compound." Advanced Materials Research 894 (February 2014): 37–42. http://dx.doi.org/10.4028/www.scientific.net/amr.894.37.

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This research aimed to apply the Blown Film Extrusion technique to synthesize the titanium dioxide (TiO2) bio-composite films incorporated on a thin film as a photocatalyst. The biopolymer materials have great recognition via their renewable and biodegradable characteristic and the green composite has been a new challenge path to replace traditional polymer composite. In this work, TiO2/Polybutylene succinate (PBS) bio-composite film was developed to be used as a supporter for determining the photocatalytic oxidation activity of the TiO2 on the chlorinated volatile organic compounds degradation. PBS is a synthetic biopolymer which has a reasonable mechanical strength. The modified-TiO2/PBS bio-composite films were studied to evaluate the degradation of dichloromethane. In order to improve the distribution of the developed photocatalyst, the TiO2 powders were modified by 0.05% mole of ethyl triethoxysilane (ETES) and stearic acid (SA), respectively. The 10% wt. TiO2/PBS bio-composite films with thickness of 30 μm were prepared by blown film technique. To evaluate the dispersion efficacy, the modified-TiO2/PBS bio-composite films were characterized by Scanning Electron microscopy (SEM). Photocatalytic degradation of dichloromethane in gas phase was determined using an annular closed system photoreactor. The obtained result which was corresponding to the absorption of TiO2/PBS bio composites film was investigated in a range of 300-400 nm via UV/VIS spectrophotometry. The energy band gap of TiO2, ethyl triethoxysilane-TiO2 and stearic acid-TiO2 bio-composite film was found to be 3.18, 3.21, and 3.26 eV, respectively. The SEM shows that the modified-TiO2 with both ETES and SA exhibit uniform dispersion, while the only TiO2 shows an evidence of agglomeration in the PBS matrix. For photocatalyst efficiency, the photocatalytic activity of modified-TiO2/PBS bio-composite film increased comparing to the TiO2/PBS bio-composite film. Moreover, the photocatalytic degradation of dichloromethane by ETES-TiO2/PBS bio-composite film yielded degradation efficiency of 47.0%, whereas SA-TiO2/PBS bio-composite film yielded the removal efficiency of 41.0% for detention time at 350 min.

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Strlič, Matija, Irena Kralj Cigić, Alenka Možir, Gerrit de Bruin, Jana Kolar, and May Cassar. "The effect of volatile organic compounds and hypoxia on paper degradation." Polymer Degradation and Stability 96, no. 4 (April 2011): 608–15. http://dx.doi.org/10.1016/j.polymdegradstab.2010.12.017.

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Sallem-Idrissi, Naïma, Caroline Vanderghem, Tiphanie Pacary, Aurore Richel, Damien P. Debecker, Jacques Devaux, and Michel Sclavons. "Lignin degradation and stability: Volatile Organic Compounds (VOCs) analysis throughout processing." Polymer Degradation and Stability 130 (August 2016): 30–37. http://dx.doi.org/10.1016/j.polymdegradstab.2016.05.028.

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32

Lin, Bo Tao, Dong Mei Shi, Tao Li, and Sen Kuan Meng. "Progress in Research of the Combined Adsorption-Photocatalysis for the Removal of Volatile Organic Compounds." Advanced Materials Research 1015 (August 2014): 540–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.540.

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TiO2photocatalytic technology was developed in the past two decades in air treatment because of good photocatalytic effect, non-toxic, chemical stability, low cost, reusable features, the effect use of solar energy. A new composite materials of visible light photocatalytic degradation of low concentration of volatile organic compounds were produced by use of combining the adsorbent with TiO2photocatalytic technology.The adsorbent can enrich concentrations of volatile organic compounds on the surface of the TiO2photocatalyst. In this paper,the mechanism of the combined adsorption-photocatalysis for the removal of volatile organic compounds and immobilization methods、principle、craft were reviewed.The characteristic of the immobilization methods was analysed.It laid the foundation for the optimizing of the immobilization methods and the improving of the photocatalytic efficiency.

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Hoven, Vipavee P., Kesinee Rattanakaran, and Yasuyuki Tanaka. "Determination of Chemical Components that Cause Mal-Odor from Natural Rubber." Rubber Chemistry and Technology 76, no. 5 (November 1, 2003): 1128–44. http://dx.doi.org/10.5254/1.3547792.

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Abstract Odorous components emitted from different forms of solid natural rubber (NR) were analyzed using gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS) associated with head space sampling technique. The most odorous components from most samples were identified as low molecular weight volatile fatty acids (C2-C5). Other volatile organic contents verified based on characteristic ions of mass spectra included carbonyl compounds, low molecular weight compounds containing nitrogen or sulfur and aromatic compounds. The total content and composition of volatile organic compounds were directly correlated to the rubber quality and drying process. Low-grade NR samples, i.e. STR 20 from cup lumps with intense smell, had high quantity of volatile organic contents especially low molecular weight volatile fatty acids. On the other hand, high-quality rubber, i.e. deproteinized NR and STR 5L from which no smell was detected, contained only minute quantities of volatile organic contents. Aromatic components were regarded as other major odorous contents found in ribbed smoked sheet (RSS) samples. The results suggested that the odorous components were the by-products of non-rubber components which had undergone microbial breakdown during storage or thermal degradation during processing.

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34

Xie, Yangyang, Sining Lyu, Yue Zhang, and Changhong Cai. "Adsorption and Degradation of Volatile Organic Compounds by Metal–Organic Frameworks (MOFs): A Review." Materials 15, no. 21 (November 2, 2022): 7727. http://dx.doi.org/10.3390/ma15217727.

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Volatile organic compounds (VOCs) are a major threat to human life and health. The technologies currently used to remove VOCs mainly include adsorption and photocatalysis. Adsorption is the most straightforward strategy, but it cannot ultimately eliminate VOCs. Due to the limited binding surface, the formaldehyde adsorption on conventional photocatalysts is limited, and the photocatalytic degradation efficiency is not high enough. By developing novel metal–organic framework (MOF) materials that can catalytically degrade VOCs at room temperature, the organic combination of new MOF materials and traditional purification equipment can be achieved to optimize adsorption and degradation performance. In the present review, based on the research on the adsorption and removal of VOCs by MOF materials in the past 10 years, starting from the structure and characteristics of MOFs, the classification of which was described in detail, the influencing factors and mechanisms in the process of adsorption and removal of VOCs were summarized. In addition, the research progress of MOF materials was summarized, and its future development in this field was prospected.

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35

Borucka, Monika, Maciej Celiński, Kamila Sałasińska, and Agnieszka Gajek. "Identification of volatile and semi-volatile organic compounds emitted during thermal degradation and combustion of triadimenol." Journal of Thermal Analysis and Calorimetry 139, no. 2 (July 6, 2019): 1493–506. http://dx.doi.org/10.1007/s10973-019-08531-y.

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36

Knothe, G., M. O. Bagby, T. W. Ryan, H. G. Wheeler, and T. J. Callahan. "Semi-volatile and volatile compounds formed by degradation of triglycerides in a pressurized reactor." Journal of the American Oil Chemists' Society 69, no. 4 (April 1992): 341–46. http://dx.doi.org/10.1007/bf02636064.

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37

Chang, Tian, Chuanlong Ma, Anton Nikiforov, Savita K. P. Veerapandian, Nathalie De Geyter, and Rino Morent. "Plasma degradation of trichloroethylene: process optimization and reaction mechanism analysis." Journal of Physics D: Applied Physics 55, no. 12 (December 22, 2021): 125202. http://dx.doi.org/10.1088/1361-6463/ac40bb.

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Abstract In this study, a multi-pin-to-plate negative corona discharge reactor was employed to degrade the hazardous compound trichloroethylene (TCE). The response surface methodology was applied to examine the influence of various process factors (relative humidity (RH), gas flow rate, and discharge power) on the TCE decomposition process, with regard to the TCE removal efficiency, CO2 and CO selectivities. The variance analysis was used to estimate the significance of the single process factors and their interactions. It has been proved that the discharge power had the most influential impact on the TCE removal efficiency, CO2 and CO selectivities and subsequently the gas flow rate, and finally RH. Under the optimal conditions with 20.83% RH, 2 W discharge power and 0.5 l min–1 gas flow rate, the optimal TCE removal efficiency (86.05%), CO2 selectivity (8.62%), and CO selectivity (15.14%) were achieved. In addition, a possible TCE decomposition pathway was proposed based on the investigation of byproducts identified in the exhaust gas of the non-thermal plasma reactor. This work paves the way for control of chlorinated volatile organic compounds.

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38

Jiang, Nan, Lianjie Guo, Kefeng Shang, Na Lu, Jie Li, and Yan Wu. "Discharge and optical characterizations of nanosecond pulse sliding dielectric barrier discharge plasma for volatile organic compound degradation." Journal of Physics D: Applied Physics 50, no. 15 (March 14, 2017): 155206. http://dx.doi.org/10.1088/1361-6463/aa5fe9.

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39

Yang, Zhouli, Lu Chen, Ying Chen, Yujun Ju, Zhengze Zhang, Zhidong Zhang, Zhen Wang, et al. "All-in-one solar-driven evaporator for high-performance water desalination and synchronous volatile organic compound degradation." Desalination 555 (June 2023): 116536. http://dx.doi.org/10.1016/j.desal.2023.116536.

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40

WATANABE, Masatoshi, Toshiyuki KAMATA, Hidetomo YAMAMORI, and Eiichi ITO. "Degradation Products of Volatile Chlorinated Organic Compounds(VOC) in Groundwater and Soil." Journal of Environmental Chemistry 7, no. 1 (1997): 53–59. http://dx.doi.org/10.5985/jec.7.53.

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41

Tassi, Franco, Giordano Montegrossi, Orlando Vaselli, Caterina Liccioli, Sandro Moretti, and Barbara Nisi. "Degradation of C2–C15 volatile organic compounds in a landfill cover soil." Science of The Total Environment 407, no. 15 (July 2009): 4513–25. http://dx.doi.org/10.1016/j.scitotenv.2009.04.022.

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Yan, Tingjiang, Jinlin Long, Xicheng Shi, Donghui Wang, Zhaohui Li, and Xuxu Wang. "Efficient Photocatalytic Degradation of Volatile Organic Compounds by Porous Indium Hydroxide Nanocrystals." Environmental Science & Technology 44, no. 4 (February 15, 2010): 1380–85. http://dx.doi.org/10.1021/es902702v.

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43

Jenkin, Michael E., Sandra M. Saunders, and Michael J. Pilling. "The tropospheric degradation of volatile organic compounds: a protocol for mechanism development." Atmospheric Environment 31, no. 1 (January 1997): 81–104. http://dx.doi.org/10.1016/s1352-2310(96)00105-7.

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44

Schmid, Stefan, Matthias C. Jecklin, and Renato Zenobi. "Degradation of volatile organic compounds in a non-thermal plasma air purifier." Chemosphere 79, no. 2 (March 2010): 124–30. http://dx.doi.org/10.1016/j.chemosphere.2010.01.049.

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45

Li, Jufen, Tao Lin, Dandan Ren, Tan Wang, Ying Tang, Yiwen Wang, Ling Xu, Pinkuan Zhu, and Guobin Ma. "Transcriptomic and Metabolomic Studies Reveal Mechanisms of Effects of CPPU-Mediated Fruit-Setting on Attenuating Volatile Attributes of Melon Fruit." Agronomy 11, no. 5 (May 19, 2021): 1007. http://dx.doi.org/10.3390/agronomy11051007.

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N1-(2-chloro-4-pyridyl)-N3-phenylurea (CPPU), a synthetic cytokinin-active compound, is widely applied to induce parthenocarpic fruit set and enhance melon fruit enlargement (Cucumis melo L.). CPPU may also influence fruit quality; however, the mechanisms through which this occurs remain unknown. We investigated the differences in volatile emissions between parthenocarpic fruit set by CPPU (C) and seeded fruit set by artificial pollination (P). Gas chromatography–mass spectrometry (GC–MS) analysis revealed that six volatile organic compounds (VOCs) emitted by the P-group fruits were not detected in C-group fruits. The relative abundances of another 14 VOCs emitted by the CPPU-treated fruits were less than those in the P-group fruits. RNA sequencing analysis indicated that a total of 1027, 994, and 743 differentially expressed genes (DEGs) were detected in the C20 (treatment with 20 mg·L–1 CPPU) vs. P, P-C20 (pollination followed by 20 mg·L−1 CPPU treatment) vs. P, and P-C20 vs. C20 treatments, respectively. Compared with the Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) databases, the DEGs related to fatty acid degradation and metabolism, which contribute to volatile production, were enriched. In particular, DEGs such as carotenoid cleavage dioxygenase (CCD)-, lipoxygenase (LOX)-, alcohol dehydrogenase (ADH)-, and alcohol acyltransferase (ATT)-related genes were closely related to the formation of volatiles. In summary, our study provides a metabolic and transcriptomic atlas, reveals the impact of CPPU on VOCs, and enhances our understanding of the mechanisms of CPPU that contribute towards generally reducing the quality of melon fruit.

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McLoughlin, Emma, Angela H. Rhodes, Susan M. Owen, and Kirk T. Semple. "Biogenic volatile organic compounds as a potential stimulator for organic contaminant degradation by soil microorganisms." Environmental Pollution 157, no. 1 (January 2009): 86–94. http://dx.doi.org/10.1016/j.envpol.2008.07.029.

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Zhu, Jiping, Matthew Yao, Yingjie Li, and Cecilia C. Chan. "Insitu thermal degradation of isopropanol under typical thermal desorption conditions for GC-MS analysis of volatile organic compounds." Anal. Methods 6, no. 15 (2014): 6116–19. http://dx.doi.org/10.1039/c4ay00415a.

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Shahidi, Fereidoon, and Abul Hossain. "Role of Lipids in Food Flavor Generation." Molecules 27, no. 15 (August 6, 2022): 5014. http://dx.doi.org/10.3390/molecules27155014.

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Lipids in food are a source of essential fatty acids and also play a crucial role in flavor and off-flavor development. Lipids contribute to food flavor generation due to their degradation to volatile compounds during food processing, heating/cooking, and storage and/or interactions with other constituents developed from the Maillard reaction and Strecker degradation, among others. The degradation of lipids mainly occurs via autoxidation, photooxidation, and enzymatic oxidation, which produce a myriad of volatile compounds. The oxidation of unsaturated fatty acids generates hydroperoxides that then further break down to odor-active volatile secondary lipid oxidation products including aldehydes, alcohols, and ketones. In this contribution, a summary of the most relevant and recent findings on the production of volatile compounds from lipid degradation and Maillard reactions and their interaction has been compiled and discussed. In particular, the effects of processing such as cooking, drying, and fermentation as well as the storage of lipid-based foods on flavor generation are briefly discussed.

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Venkateshaiah, Abhilash, Daniele Silvestri, Stanisław Wacławek, Rohith K. Ramakrishnan, Kamil Krawczyk, Padmanapan Saravanan, Mirosława Pawlyta, Vinod V. T. Padil, Miroslav Černík, and Dionysios D. Dionysiou. "A comparative study of the degradation efficiency of chlorinated organic compounds by bimetallic zero-valent iron nanoparticles." Environmental Science: Water Research & Technology 8, no. 1 (2022): 162–72. http://dx.doi.org/10.1039/d1ew00791b.

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Various bimetallic nZVI were used in the degradation of chlorinated volatile organic compounds (CVOC) in spiked water and real groundwater. It was found that Ni may be a good alternative to Pd to be used along with nZVI for dechlorination of CVOC.

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Yoo, Tae Hee, Heejoong Ryou, In Gyu Lee, Junsang Cho, Byung Jin Cho, and Wan Sik Hwang. "Comparison of Ga2O3 and TiO2 Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds." Catalysts 10, no. 5 (May 14, 2020): 545. http://dx.doi.org/10.3390/catal10050545.

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The photocatalytic degradation of formaldehyde, acetaldehyde, toluene, and styrene are compared using monoclinic Ga2O3 and anatase TiO2 nanostructures under ultraviolet-C irradiation. These Ga2O3 and TiO2 photocatalysts are characterized using a field emission scanning electron microscope, a powder X-ray diffraction system, the Brunauer–Emmett–Teller method, and a Fourier transform infrared spectrometer. The Ga2O3 shows a higher reaction rate constant (k, min−1) than TiO2 by a factor of 7.1 for toluene, 8.1 for styrene, 3.1 for formaldehyde, and 2.0 for acetaldehyde. The results demonstrate that the photocatalytic activity ratio of the Ga2O3 over the TiO2 becomes more prominent toward the aromatic compounds compared with the nonaromatic compounds. Highly energetic photo-generated carriers on the conduction/valence band-edge of the Ga2O3, in comparison with that of the TiO2, result in superior photocatalytic activity, in particular on aromatic volatile organic compounds (VOCs) with a high bond dissociation energy.

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Journal articles on the topic 'Volatile organic compound degradation'

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