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해양 퇴적물에서 인 용출 차단을 위한 반응성 피복 소재로서 제강슬래그의 적용성 검토
조성욱,박성직,Jo, Sung-Wook,Park, Seong-Jik 한국농공학회 2014 한국농공학회논문집 Vol.56 No.3
We investigated the applicability of steel slag as a capping material in order to minimize phosphorus(P) release into seawater. Steel slag is a byproduct from the iron and steel industries and the use of steel slag has some advantages in respect of both cost and environmental concern. P removal by steel slag were studied in a batch system with respect to changes in contact time and initial concentration. Kinetic adsorption data were described well by pseudo 2nd order model, indicating rate limiting step for P adsorption to steel slag is chemical sorption. Equilibrium adsorption data fitted well to Langmuir isotherm model which describes for single layer adsorption. The maximum P adsorption capacity of steel slag was 7.134 mg-P/L. Increasing the depth of steel slag produced a positive effect on interruption of P release. More than 3 cm of steel slag was effective for blocking P release and 5 cm of steel slag was recommended as the depth for capping of P contaminated marine sediments. Increasing P concentration and flow rate had a negative effect on P removal ratio. It was concluded that the steel slag has a potential capping material for blocking P release from marine sediments.
오태협,이한욱,박성직,박재우,Oh, Tae Hyup,Lee, Hanuk,Park, Sung Jik,Park, Jae-Woo 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1
Fenton is the reaction using the OH· radicals generating by interaction between hydrogen peroxide and Fe<sup>2+</sup> which can oxidize the contaminants. Fe<sup>2+</sup> ions are oxidized to Fe<sup>3+</sup> ions by reaction with H<sub>2</sub>O<sub>2</sub> and formed OH· radicals. UV-Fenton process includes the additional reaction that generates the OH· radicals by photodegradation of H<sub>2</sub>O<sub>2</sub>. In methylorange (MO) decolourization experiment with UV-Fenton, optimal Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> ratio was obtained at 1 : 10. Based on the obtained condition (H<sub>2</sub>O<sub>2</sub>= 10mM, Fe<sup>2+</sup> = 1 mM) with/without UV-fenton experiment was carried out. Removal efficiency and sludge production were measured at 30 min. The case of w/o UV irradiation and only H<sub>2</sub>O<sub>2</sub> was hardly treated and only Fe<sup>2+</sup> showed 65% removal owing to coagulation. When UV-Fenton process in optimal ratio (Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> = 1 : 10), UV irradiation showed better removal efficiency than of w/o UV irradiation. Also, MO decolourization was a function of the hydrogen peroxide concentration (x<sub>1</sub>), Fe<sup>2+</sup>:H<sub>2</sub>O<sub>2</sub> ratio (x<sub>2</sub>), and numbers of UV lamp (x<sub>3</sub>) from the application of the response surface methodology. Statistical results showed the order of significance of the independent variables to be hydrogen peroxide concentration > numbers of UV l amp > Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> ratio.
엄병환,조성욱,강구,박성직,Um, Byung-Hwan,Jo, Sung-Wook,Kang, Ku,Park, Seong-Jik 한국농공학회 2013 한국농공학회논문집 Vol.55 No.3
The present study was conducted to investigate the adsorption potential of red mud for fluoride removal. Different operation parameters such as the effect of contact time, initial concentration, pH, competing anions, seawater, adsorbent dose amount, and adsorbent mixture were studied. Nearly 3 hr was required to reach sorption equilibrium. Equilibrium sorption data were described well by Langmuir model and the maximum adsorption capacity of red mud was 5.28 mg/g. The fluoride adsorption at pH 3 was higher than in the pH range 5-9. The presence of anions such as sulfate, nitrate, phosphate, and bicarbonate had no significant effect on fluoride adsorption onto red mud. The fluoride removal by red mud was greater in seawater than deionized water, resulting from the presence of calcium and magnesium ion in seawater. The use of red mud alone was more effective for the removal of fluoride than mixing red mud with other industrial waste such as oyster shells, lime stone, and steel slag. This study showed that red mud has a potential application in the remediation of fluoride contaminated soil and groundwater.
엄병환 ( Byung Hwan Um ),조성욱 ( Sung Wook Jo ),박성직 ( Seong Jik Park ) 한국목재공학회 2014 목재공학 Vol.42 No.4
파쇄한 소나무와 참나무를 수중에서 Pb(II) 제거를 위한 흡착제로서 적용성을 검토하였다. 접촉시간, 초기 Pb(II) 농도, pH, 경쟁이온, 그리고 흡착제 주입량이 Pb(II) 흡착에 미치는 영향을 파악하기 위하여 회분 흡착 실험을 수행하였다. 동역학적 실험 결과, 소나무와 참나무에 Pb(II) 흡착은 유사 1차 모델과 유사 2차 모델 모두 적합한 것으로 나타났다. 평형 흡착 실험 결과는 결정계수가 소나무의 경우 0.956, 참나무의 경우 0.950으로 Freundlich 모델이 적합한 것으로 나타났다. 소나무와 참나무의 Pb(II) 최대 흡착양은 각각 16.853과 27.989 mg/g으로 나타났다. pH가 3에서 9로 증가함에 따라서 소나무와 참나무에 Pb(II) 흡착은 증가하였다. Na+, Ca2+, 그리고 Al3+와 같은 양이온의 존재는 Pb(II) 흡착을 감소시켰다. Pb(II) 흡착은 증류수 조건에서 보다 해수에서 흡착량이 컸으며, 이는 해수에 존재하는 CO32-와 OH- 이온이 Pb(II)와 화합물을 형성하기 때문이다. 본 연구를 통해서 Pb(II)로 오염된 물 정화에 소나무와 참나무가 활용될 것으로 판단된다. Crushed pinewood and oakwood were studied as an adsorbent for Pb(II) removal from aqueous solution. Batch adsorption experiments were carried out to describe the effects of contact time, initial Pb(II) concentration, pH, competing cations, and adsorbent dosage on the Pb(II) adsorption process. Kinetic studies revealed that the Pb(II) adsorption process for pinewood and oakwood followed both pseudo first and pseudo second order model. The Fruendlich model best described equilibrium adsorption data with correlation coefficients (R2) of 0.956 and 0.950 for pinewood and oakwood. The maximum adsorption capacity of Pb(II) onto pinewood and oakwood was found to be 16.853 and 27.989 mg/g, respectively. The Pb(II) adsorption onto both pinewood and oakwood was increased as pH increased in the pH range 3-9. The presence of cations such as Na+, Ca2+, and Al3+ decreased Pb(II) adsorption. The Pb(II) removal was greater in seawater than deionized water, resulting from the presence of CO3 2- and OH- ions in seawater. This study showed that pinewood and oakwood have a potential application in the remediation of Pb(II) contaminated water.
그래핀 옥사이드와 이산화티타늄 조합을 이용한 이산화탄소의 광환원
이명규 ( Myung Kyu Lee ),장준원 ( Jun Won Jang ),박성직 ( Sung Jik Park ),박재우 ( Jae Woo Park ) 한국물환경학회 2016 한국물환경학회지 Vol.32 No.1
In this study, we synthesized a combination of graphene oxide (GO) and titanium dioxide (TiO2) and confirm that GO can be used for CO2 photoreduction. TiO2 exhibited highly efficient combination with other conventional electric charges generated by these paration phenomenon for suppression of hole-electron recombination. This improved the efficiency of CO2 photoreduction. The synthetic form of GO-TiO2 used in this study was agraphene sheet surrounded by TiO2 powder. Efficiency and stability were enhanced by combination of GO and TiO2. In a CO2 photoreduction experiment, the highest CO conversion rate was 0.652 μmol/g·h in GO10-TiO2 (2.3-fold that of pure TiO2) and the highest CH4 production rate was 0.037 μmol/g·h in GO0.1-TiO2 (2.4-fold that of pure TiO2). GO enhances photocatalytic efficiency by functioning as a support and absorbent, and enabling charge separation. With increasing GO concentration, the CH4 level decreases to~45% due to decreased transfer of electrons. In this study, TiO2 together with GO yielded a different result than the normal doping effect and selective CO2 photoreduction.