Papers by Keyword: Volatile Organic Compound (VOC)

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Authors: Wei Qiu Huang, Feng Li, Shu Hua Zhao, Jing Zhong
Abstract: A pilot-scale experimental system of filling gasoline into a tank was built to investigate gasoline vapor-air mass transfer in the tank gas space and the vapor evaporation loss from the tank in different operating conditions. The results showed that the higher the location of filling pipe exit inside the tank, the quicker the speed of the filling gasoline, and the higher the initial vapor concentration in the tank gas space, then the more severe the vapor-air convective transport and the larger the gasoline evaporation loss rates.
Authors: Li Xie, Jiang Yu, Shuang Li, Sha Sha Diao
Abstract: Eight volatile organic compounds (VOCs) in the four disposable food packages at refrigeration temperature, room temperature and heating temperature have been analyzed by a headspace gas chromatography and mass spectrometry method. The results of external standard method show that the amount of VOCs in the four disposable packages at different temperatures are arranged in the following order: black plastic lunch box, white plastic lunch box, paper cup, paper bowl. Under the three types of temperature for an hour, the amount of VOCs in the black plastic lunch box at heating temperatures is higher (1.2382 mg/m2 at 90 °C), room temperature has smaller content (0.6682 mg/m2 and 0.9105 mg/m2 at 20 °C and 30 °C, repectively). Content of VOCs in the white plastic lunch box increases gradually with temperature rising.
Authors: Wan Xi Peng, Lan Sheng Wang, Qing Ding Wu, Shi Long Xiang
Abstract: Poplar composite biomaterial, which self bonded under high temperature and pressure, is a new indoors materials. In order to evaluate its potential health risk to human settlements, the volatile organic compounds of poplar composite biomaterial were adsorbed and determined by TD-GC-MS. The result were: (1) The main constituents of volatiles at 40°С were acetic acid(50.6%), 1,2-benzenedicarboxylic acid, mono(2-ethylhexyl) ester(8.48%), [1,1':3',1''-terphenyl]-2'-ol(3.98%), 1,2-propanediol, 3-benzyloxy-1,2-d iacetyl-(3.12%), etc. (2) The main constituents of volatiles at 60°С were acetic acid(46.7%), 1,2-benzenedicarboxylic acid, mono(2-ethylhexyl) ester(7.93%), cedrol(5.53%), butane, 1-(benzyloxy)-2-[(benzylox y)methyl]- (5.43%), [1,1':3',1''-terphenyl]- 2'-ol(3.72%), 1-propene, 3-(2-cyclopentenyl)-2-m ethyl-1,1- diphenyl-(3.18%), etc. Generally, the poplar composite biomaterial was safe under 40-60°С.
Authors: Wan Xi Peng, Qiu Xue, Feng Juan Wu, Xu Zhang, Zhong Feng Zhang
Abstract: Smoked bamboo, which was made by bamboo in high temperature smoke, is a new indoors materials. In order to evaluate its potential health risk to human settlements, the volatile organic compounds of smoked bamboo biomaterial were adsorbed and determined by TD-GC-MS. And the main constituents of volatiles at 60°С were cyclononasiloxane, octadecamethyl-(35.14%), acetic acid(23.27%), cyclotrisiloxane, hexamethyl- (9.53%), bicyclo[4.4.0]dec-1-ene,2-isoprop yl-5-methyl-9-methylene-(7.56%), silane, 1,4-phenylenebis[trimethyl(4.32%), 1,3-benzodioxole, 5-(2-propenyl)- (3.47%), cedrol(2.75%), etc. (2) The main constituents of volatiles at 130°С were acetic acid(43.78%), 2,5-furandione, dihydro-3- methylene-(16.57%), 1,3-benzodioxole, 5-(1-propenyl)-,(z)-(6.75%), octasiloxane, 1,1,3,3,5,5,7,7,9,9, 11,11,13, 13,15,15- hexadecamethyl -(4.09%), bicyclo[2.2.1]heptan-2-one, 1,7,7- trimethyl-, (1s)- (3.21%), etc. Generally, the smoked bamboo biomaterial was safe under 60-130°С.
Authors: Xiao Qiang Cao, Xian Jun Lv, Jun Qiu, Shu Gang Hu, Sheng Rong Liu, Xue Min Huang
Abstract: Experimental investigations using granular activated carbon (GAC) adsorption and then desorpted with microwave irradiation for toluene abatement are reported in this paper. The results indicated that For different kinds of catalysts, Cu0.33Mn0.67Ox/γ-Al2O3 had the highest catalytic activity. For toluene combustion, the temperature required for 99% toluene conversion was lower than 300°C. In combination process of microwave desorption with catalytic combustion, the toluene conversion was ranged from 92% to 99% and the optimum volume flow rate ratio of carrier and air was 1:1.
Authors: Ying Jie Li, Hua Qian, Shen Gao Jing, Hai Xia Dai
Abstract: Tightness, dynamic back pressure and air to liquid volume ratio (A/L) of vapor recovery system of gasoline filling stations were detected, VOCs was analyzed by GC, in-station diagnostic operation status was inspected by site investigation. The results denoted that the modification of gasoline filling stations was not complete and the installed vapor recovery systems didn’t operate under normal state. Insufficient understanding on vapor recovery control, poor management and unsuitable regulations resulted in these problems. Some solutions such as enhancing the propaganda, making preferential policies, holding training for the connected staffs, maintenance in time, and revising the unsuitable regulations were proposed. This study has positive significance in promoting vapor recovery control developed in China.
Authors: Chen Yu Chang, Yao Chuan Lee, Ching Hsing Lin, Jyh Wei Lee, Yu Jie Chang, Jian Huan Chen
Abstract: The TiO2 thin films were coated on the 100 meshes stainless steel 304 (SS304) sieves by using the sol-gel method followed by a thermal treatment at 200oC. The prepared TiO2-coated sieves were then employed to setup a photocatalytic reactor for evaluating their abilities on the degradation of VOCs (volatile organic compounds). The UV lamp was enveloped with a cylinder TiO2-coated sieve and located in the center of the reactor. A VOCs diffusing tube was applied to yield acetone under water bath. The yielded gaseous acetone was enforced to pass through the TiO2-coated sieves and reacted by photocatalytic reaction. Both the inflow gas and off-gas were monitored by a PID (photoionization detector) sensor for calculating the treat efficiencies under various conditions. The results showed that the amorphous structure was observed on the TiO2 films after sol-gel method, whereas the crystalline anatase phase was found after annealing at 200oC. The SEM images showed that the surface morphology of TiO2 coated SS304 sieves was very similar to that of uncoated sieves, demonstrating a good uniformity and thin thickness of the sol-gel coating method derived in this work. It was observed that most volatile acetone (almost 100%) was removed after treated with the designed photocatalytic reactor under a high fed flow rate (0.5- 2.0 l/min). As compared with the control experiments (UV OFF test), the adequate photocatalytic abilities of this developed TiO2 coated sieves were demonstrated. With the advantages of high contacting area with VOCs, low headloss, durable substrate and easy maintenance, the TiO2-coated sieves possessed a high potential for applying on the photocatalytic degradation of indoor air pollutants.
Authors: Jun Liu, Qiu Lin Tan, Chen Yang Xue, Ji Jun Xiong
Abstract: Based on the photo ionization principle, a gas sensor for the hydrazine is designed. The photo ionization gas sensor can also measure other volatile organic compounds and other gases in concentrations from sub parts per billion to 10000 parts per million (ppm). This gas sensor is the most efficient and inexpensive type of gas sensor. They are capable of giving real-time readings and monitoring continuously. The design of micro ionization chamber, signal detection circuits and installation technology is expatiated in detail. Through researching the design of cell structure, the cell with integration and miniaturization has been devised. By taking Single-Chip Microcomputer (SCM) as intelligence handling, the functional block diagram of gas detection system is designed with the analyzing and devising of its hardware and software system. Experiment results show that the gas sensor has reached the technology requirement of portable, mini-volume, high accuracy, fast response, continuous test, and is able to apply in detecting the organic gases. Therefore, the photo ionization sensor has a promising future for the hydrazines gas and volatile organic compounds detection.
Authors: De Liang Chen, Tao Li, Li Yin, Rui Zhang, Xin Jian Li
Abstract: Hierarchical SnO2 (H-SnO2) and particulate SnO2 (P-SnO2) nanostructures were synthesized by a hydrothermal method with and without the aid of sodium 1-dodecanesulfonate (SDS), respectively. X-ray diffraction and scanning electron microscopy were used to characterize the products obtained. The sensing properties of the H-SnO2 and P-SnO2 nanostructures to volatile organic compound gas (VOCs) were measured. The H-SnO2 sensors show better gas-sensing performance than the P-SnO2 sensors due to the hierarchical microstructure.
Authors: José J. Gonçalves, Gabriela V. Silva, Armando S. Santos, Eduardo O. Fernandes
Abstract: Diffusion and partition coefficients are key parameters for the characterization of building materials as sources and sinks of air pollutants indoors. A simple and rapid experimental method for direct measurement of the diffusion coefficient (D) was presented in a previous article [1]: the modified dry cup method. This method was based upon two existent methodologies, the passive sampling on Tenax TA and the dry cup method, proposed by Haghighat et al. [2]. In the present article, some improvements were made in the experimental set-up in order to obtain more precise results. The previous cup was modified by increasing the number of Tenax tubes, connected to the bottom of the cup, from one to five. The results obtained with both cups were compared. Measurements with single compounds and with three compounds simultaneously were compared in order to evaluate the influence of competition between molecules of different compounds.
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