• Applied Chemistry for Engineering
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• v.22 no.5
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• pp.582-585
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• 2011

In this study, surface-adsorbed species of 1,2-dichlorobenzene (1,2-DCB) on mesoporous $V_2O_5/TiO_2$ catalysts synthesized by spray pyrolysis were investigated through the adsorption/desorption performed using in situ FT-IR cell. Also, the comparison of adsorbed species with $TiO_2$ and $V_2O_5/TiO_2$ synthesized by the incipient wetness was carried out.

• Korean Chemical Engineering Research
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• v.45 no.3
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• pp.215-218
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• 2007

The aim of this study is to test the feasibility of Pt/Al-MCM-41 for the dioxin decomposition reaction. For model reaction, 1,2-dichlorobenzene was decomposed instead of dioxin. $Pt/{\gamma}-Al_2O_3$ was compared with Pt/Al-MCM-41. Al-MCM-41 catlaysts were prepared by post grafting method and the Pt/Al-MCM-41 catalysts with Si/Al = 15, 30 showed higher catalytic activity than $Pt/{\gamma}-Al_2O_3$. Their higher catalytic activities were related with acid amounts. Especially Al-MCM-41 with ion exchanged with $H^+$ enhanced catalytic activity.

• 한국생물공학회:학술대회논문집
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• 2003.04a
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• pp.390-392
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• 2003

Organic solvent tolerant bacterium, Pseudomonas savastanoi BCNU 106 could utilize trichloroacetic acid, monochloroacetic acid, trichloroethylene, p-dichlorobenzene as a sole carbon source. But Pseudomonas savastanoi BCNU 106 didn't have tolerance about trichloroacetic acid, monochloroacetic acid, trichloroethylene, p-dichlorobenzene. Strain BCNU 106 could utilize to the extend of 30 mM trichloroacetic acid as a sole carbon source on mineral salt medium.

• Journal of Korean Society on Water Environment
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• v.29 no.4
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• pp.489-496
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• 2013

Ground water underlying soil is vulnerable to pollution by organic chemicals through their percolation through the soil system. This study was conducted to provide information on the seepage behavior of organic chemical contaminants in clay, silty and sandy soils. Chloroform, 1,1,1-trichloroethane and trichloroethylene are readily transported through the soil; their percolated mass were 4.6-19.2 percent of the total mass applied. Tetrachloroethylene, 1,2-dichlorobenzene and 1,3-dichlorobenzene were retarded by soils due to sorption. Between 0.6 and 4.8 percent of the material applied to the surface percolated within the experimental period. Carbon tetrachloride was attenuated considerably by passage through soils. Only 0.1-0.4 percent of the mass reached the groundwater. Significant degradation of bromoform was observed. Apparent breakdown of intermediates of the brominated compounds were detected. Transformations of the brominated compounds appear to be the result of both biological and chemical processes. The effect of soil type on the mobility of organic chemical contaminants was considerable. The organic contaminants moved faster in sandy soil than in either clay or silty soils.

• Korean Journal of Veterinary Research
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• v.34 no.2
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• pp.335-338
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• 1994

The tests on the oocysticidal effects of three formulations (75% o-dichlorobenzene, 7.5% cresol combined with morestan 0.5%, 1.0%, 1.5%, respectively) against immature oocysts of Eimeria tenella, were carried out. A o-dichlorobenzene preparation (72.5% o-dichlorobenzene, 7.5% cresol) on the market was selected and tested as the control. The tests were divided into two ways, the one was evaluated at different dilutions and contact times. The other was performed at different storage days. The test results are summarized as follows. Oocysticidal effects of 100% were revealed at 1 to 3 hours contact time of all morestan combined preparations. On the other hand, the perfect oocysticidal effect was revealed only at 24 hours exposure time of 100 times dilution among dilutes of control preparation. Combined rate of morestan was higher, oocysticidal effect was better. In the latter test, all morestan combined formulations had 100% of oocysticidal effect up to 5 days storage after dilution and 86.4% to 96.7% at two weeks storage after dilution, whereas the oocysticidal effects of the control preparation was gradually decreased by the storage time was passed and there was no effect at 2 weeks storage after dilution. With these results, morestan combined preparations have synergistic effect against oocysts of E tenella and can be used as the most effective oocysticidal disinfectant for broiler industry in future.

• Journal of Korean Society on Water Environment
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• v.24 no.1
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• pp.78-85
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• 2008

Evaporation of selected toxic volatile chlorinated hydrocarbons was studied in laboratory soil columns. The evaporation values were obtained for the ten volatile chlorinated hydrocarbons at two different temperatures ($12^{\circ}C$ and $21^{\circ}C$) from columns filled with silty clay loam and sandy loam soils. 1,1,1-Trichloroethane, trichloroethylene and chloroform evaporated considerably (36.7~54.6% removal), carbon tetrachloride, 1,2-dichlorobenzene, tetrachloroethylene, 1,3-dichlorobenzene, dichlorobromethane and dibromochloromethane to a lesser extent (15.3~39.3% removal), and bromoform evaporated poorly (<10 percent removal) at both temperature. Volatile chlorinated hydrocarbons concentration did not affect evaporation, no statistically significant difference in evaporation between the soil types was found. However, temperature affected evaporation, the effect of concentration on the evaporation was not conclusive.

• Journal of Environmental Science International
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• v.18 no.7
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• pp.709-714
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• 2009

Catalytic activities of $V_2O_5/TiO_2$ catalyst were investigated under reaction conditions such as reaction temperature, catalyst size, inlet concentration and space velocity. A 1,2-dichlorobenzene(1,2-DCB) concentrations were measured in front and after of the heated $V_2O_5/TiO_2$ catalyst bed, and conversion efficiency of 1,2-DCB was determined from it's concentration difference. The conversion of 1,2-DCB using a pellet type catalyst in the bench-scale reactor was lower than that with the powder type used in the micro flow-scale reactor. However, when the pellet size was halved, the conversion was similar to that with the powder type catalyst. The highest conversion was shown with an inlet concentration of 100 ppmv, but when the concentration was higher or lower than 100 ppmv, the conversion was found to decrease. Complete conversion was obtained when the GHSV was maintained at below 10,000 $h^{-1}$, even at the relatively low temperature of $250^{\circ}C$. Water vapor inhibited the conversion of 1,2-DCB, which was suspected to be due to the competitive adsorption between the reactant and water for active sites.

• Textile Coloration and Finishing
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• v.26 no.4
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• pp.347-352
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• 2014

Film thickness dependent nanostructure evolution by a post annealing was investigated in poly (3-hexylthiophene):phenyl-C61-butyric acid methyl ester(P3HT:PCBM) films for organic solar cells which were fabricated by dichlorobenzene(DCB) solvent. In case of a 70nm thin film, the thermal annealing process affected to slight increment of the P3HT crystals in the surface region. On the other hand, large number of small sized P3HT crystals near the surface region was formed in the 200nm thick film. The solar cell devices showed the 3% power conversion efficiency(PCE) in 1:0.65 and 1:1 ratio(by weight) of P3HT and PCBM in 70nm and 200nm thickness conditions, respectively. Despite to the similar PCE, the short circuit current Jsc was different in 70nm and 200nm devices, which was related to the different nanostructure of P3HT:PCBM after thermal annealing.

• Journal of Korean Society on Water Environment
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• v.26 no.4
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• pp.557-565
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• 2010

Recently, regulations on toxic compounds in aquatic environment have been strengthened in korea due to the increasing public awareness of the water quality. Typically, these regulations include introduction of emerging toxic compounds and stricter effluent limitations for the already regulated compounds. However, too strict regulations may cause excessive burden on the industry. Therefore it is also important to assess the economic impacts when the new effluent limitation guidelines are introduced. The estimation of the additional cost for the wastewater dischargers to meet the new guidelines are based on the selected treatment technology to handle the hazardous substances and the regulatory levels for effluent limitations. To explore the procedures for cost estimation in enforcing new effluent limitations, a case study was performed specially for 1,4-dichlorobenzene. The pollutants of concern are surveyed for different industrial categories and various treatment technologies. For a given pollutant, the general performances of the treatment technologies are surveyed and a representative technology is selected. For a given technology, the capital cost and annual Operation and Maintenance (O&M) cost was calculated. The calculation of baseline costs to operate ordinary treatment technologies is also important. The ratio between the cost for introducing new treatment process and the baseline cost required for conventional technology was used to evaluate the economic impact on the industry. For 1,4-dichlorobenzene, steam stripping and activated carbon processes were selected as the specific treatment technologies. The cost effects to the regulation of the compound were found to be 6.4% and 14.5% increase in capital cost and O&M cost, respectively, at the flow rate over $2,000m^3/d$ for the categories of synthetic resin and other plastics manufacturing industry. For the case of petrochemical basic compounds manufacturing industry, the cost increases were 5.8% and 12.4%, respectively. It was suggested that cost effect analysis to evaluate the economic impacts of new effluent limitations on the industry is crucial to establish more balanced and reasonable effluent limitations to manage the industrial wastewater containing emerging toxic compounds in the wastewater.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.09a
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• pp.338-341
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• 2003

유기염소계 농약 중 대표적인 살충제 $\delta$-BHC(hexachlorocyclohexane)와 1, 2-DCB (1, 2-dichlorobenzene)에 대한 논, 밭 토양 및 풍화 토에 흡착 배치실험을 통하여 토양 특성과 유기오염물간의 흡착 관계를 규명하였다. 13개의 토양시료에 대하여 pH, CEC, 유기물 함량, 비표면적, 입도분석, 원소조성분석을 통하여 토양의 물리ㆍ화학적 특징이 토양 흡착에 미치는 영향을 규명하고자 하였다. 유기염소계 농약의 흡착량을 Freundlich isotherm으로 나타내어 흡착분배계수(K$_{d}$)를 산출하였다. $\delta$-BHC는 유기물 함량이 높은 soil-4$_{d}$에서 가장 높은 $K_{d}$ 값을 보였으며, 1,2-DCB의 경우 CEC, 비표면적이 가장 낮은 soil-5에서 낮은 $K_{d}$ 값을 보여 토양 내 유기물 함량과 비표면적이 유기오염물 흡착량에 중요한 요소로 작용함을 알 수 있었다.