http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Isik Birol (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Isik Birol,Cakar Fatih,Cankurtaran Husnu,Cankurtaran Ozlem 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
The retention behavior of various organic probes on the 4-(Nonyloxy) benzoic acid liquid crystal, which is used as a stationary phase, was investigated using the inverse gas chromatography method at infinite dilution. The thermodynamic parameters including the Flory-Huggins parameter, equation-of-state interaction parameter, the mole fraction activity coefficient, the effective exchange energy parameter, and residual thermodynamic parameters were determined in the temperature range of 423.15-433.15 K by using the retention behavior of the probes on the liquid crystal. It was determined from the thermodynamic parameters that all probes were poor solvents for the liquid crystal. Besides, the results of the 4-(Nonyloxy) benzoic acid liquid crystal was compared with a liquid crystal in the literature, and the effect of the number of alkyl groups on the liquid crystals on the Flory-Huggins interaction parameter and isomer separation was evaluated.
-
Isik Birol 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12
Rumex obtusifolius roots were utilized within the scope of zero waste. Sorption of methylene blue and congo red dyes from wastewater was carried out. First, surface properties were determined using inverse gas chromatography. By this method, it was found that the surface of Rumex obtusifolius roots was acidic (KD/KA=0.13). The point of zero charge value of Rumex obtusifolius roots was determined as 5.62. Based on these results and selectivity studies, suitable dyes were selected for sorption studies. Experimental design was used for the first time to determine the parametric effects and to improve the process for the highest methylene blue and congo red removal. Optimum conditions such as pH (2–12), concentration (10–50 mg/L), adsorbent amount (0.01 g/50 mL–0.30g/50 mL), and contact time (0–210 min) were determined for the adsorption process. The Langmuir-2 model provided the best correlation, and qm values for methylene blue and congo red dyes were determined as 500.00 mg/g and 128.21 mg/g at 298 K. From the kinetic studies, it was found that the sorption process for methylene blue and congo red dyes followed pseudo-second-order kinetics. The effect of NaCl and CaCl2 salts on methylene blue and congo red sorption on Rumex obtusifolius roots was evaluated. The adsorption process was found to be endothermic for methylene blue dye (ΔHo=+19.33kJ/mol) and exothermic for congo red dye (ΔHo=−4.99kJ/mol). The process was found to be spontaneous for both dyes (ΔGo=−28.10 kJ/mol for methylene blue dye and ΔGo=−26.14kJ/mol for congo red dye at 298 K). All findings showed the potential of Rumex obtusifolius roots as a model adsorbent for the removal of various organic pollutants from wastewater.
-
Elif Sen,Zeynep Mus,Volkan Ugraskan,Birol Isik 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
In this paper, polypyrrole (PPy) composites (PPy-BC) filled with boron carbide (BC) at different ratios were synthesized for the sorption of carcinogenic methyl orange (MO) dye from aqueous media. In sorption experiments, first, optimum process parameters including operating time (0-210 min), adsorbent mass (0.01-0.30 g/50 mL), concentration (10-50 mg/L), and pH (2-12) were determined. The raw data obtained from the sorption tests were applied to the various isotherms and the Langmuir model showed the best results. From Langmuir isotherm model, the maximum sorption capacities for pristine BC, pristine PPy, and PPy-BC-10 composite were calculated as 208.3, 285.7, and 222.2 mg/g at 25 °C, pH 7, and 10-50 mg/L, respectively. It was determined that the sorption process followed the pseudo-second-order kinetic and the chemisorption process occurred. From the enthalpy values, it was determined that the process was endothermic for pristine BC (+ 40.82 kJ/mol) and pristine PPy (+ 27.33 kJ/mol), and exothermic for PPy-BC-10 (-7.48 kJ/mol). It can be said that the sorption process of MO dye on composites can be realized by electrostatic interactions, π–π interactions, H-bonding, and pore diffusion. All results showed that the prepared composites could be used as an efficient and potential adsorbent in the sorption of anionic pollutants from an aqueous environment.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
