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RISS 인기검색어
- 검색키워드
- 저자 : Dhamodaran Kavitha (검색결과 3 건)
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변상훈,Dhamodaran Kavitha,Kanagasabai Muruganandam Ponvel,Kyung-min Kim,이창하 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
Coal-based granular activated carbon was modified with acetates of sodium, potassium and lithium at concentrations of 10 and 15% and used as adsorbents to explore the adsorption mechanism of nickel ion in aqueous solution. Acetate treatment reduced surface area and pore volume of the activated carbons, but the adsorption amount of Ni(Ⅱ) on the modified activated carbons (MAC) was greater than that on the virgin activated carbon. The adsorption depended on pH of the solution with an optimum at 4.5 and the adsorbed nickel could be fully desorbed by using 0.05 M HCl solution. The maximum adsorption capacity of nickel ion on Li (15 wt%) modified activated carbon was 151.3 mg/g and the adsorption isotherm follows Langmuir, Sips, and Redlich-Peterson isotherm models better than the Freundlich isotherm model. The kinetic data was better fitted by a non-linear form of the pseudo-first order than the pseudo-second order, but the difference between two kinetic models was small.
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Adsorption of 2,4-dichlorophenol on metal-nitrate modified activated carbon
Kanagasabai Muruganandam Ponvel,Dhamodaran Kavitha,Kyung-Min Kim,이창하 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
To remove 2,4-dichlorophenol (2,4-DCP) from aqueous solution, the surface of the activated carbon was first treated with HCl and then the surface was modified by using various metal ions (Cu, Co, Fe, Ni, Zn, and Mg). Metal doping significantly enhanced the adsorption efficiency of activated carbon, an effect that was further increased by HCl treatment of the modified activated carbons. Of all the preparations, the zinc(Ⅱ)-modified activated carbon with HCl treatment showed the highest adsorption capacity for 2,4-DCP. Analysis of the zinc(Ⅱ)-modified activated carbon by SEM and BET showed a surface area and micropore volume of around 1,154.69 ㎡/g and 0.291 ㎤/g, respectively, values about 20% higher than in the starting material. In the pH range of 2.0-11.0, the maximum uptake of 2,4- DCP from an initial concentration of 1,000 mg/L was 508 mg/g at pH 4.0.
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Thillaikkarasi Dhanapal,Karthikeyan Srinivasan,Ramesh Rajendran,Sengodan Prabhu,Kavitha Dhamodaran,Muthubalasubramanian Malarvizhi 한국탄소학회 2022 Carbon Letters Vol.32 No.6
An electrical double-layer capacitor is fabricated with biomass-derived activated carbon (AC) and multi-walled carbon nanotubes (MWCNTs), which are synthesized from Pongamia pinnata fruit shell and its seed oil, respectively. The activated carbon is produced by the chemical activation process at varying carbonization temperatures from 600 to 900 °C for 5 h at a rate of 10 min in an N2 atmosphere. The surface area of activated carbon and MWCNTs is 1170 m2 g−1 and 216 m2 g−1, respectively. The total pore volumes of activated carbon and MWCNTs are 1.51 cm3 g−1 and 0.5907 cm3 g−1, respectively. The as-prepared AC and MWCNTs are characterized by surface area analysis Brunner–Emmett–Teller method (BET), X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopic analysis, field emission scanning electron microscopy, high-resolution transmission electron microscopy and energy-dispersive X-ray spectroscopy. The electrochemical performances of AC-AC, MWCNTs-MWCNTs and AC-MWCNTs (25:75) symmetric electrodes are studied by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. The AC-MWCNTs (25:75) single electrode performance is also studied in two different electrolytes, such as 0.5 M Na2SO4 and 0.5 M H2SO4. The fabricated AC-MWCNTs (25:75) symmetric supercapacitor cell exhibits excellent electrochemical performance in 0.5 M Na2SO4. It shows a specific capacitance of 55.51 Fg−1, energy density 4.852 Wh Kg−1 and power density of 199.18 W Kg−1 at a current density of 1 Ag−1 in the voltage window of 0–1.8 V. The AC-AC and AC-MWCNTs (25:75) symmetric supercapacitor electrodes show outstanding performance.
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