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RISS 인기검색어
- 검색키워드
- 저자 : Gopal Pugazhenthi (검색결과 3 건)
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Investigation of equilibrium and kinetic parameters of methylene blue adsorption onto MCM-41
Gopal Pugazhenthi,Purushothaman Monash 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
Mesoporous MCM-41 was synthesized at room temperature using tetraethoxysilane (TEOS) with cetyltrimethylammonium bromide (CTAB) and employed as an effective adsorbent for the adsorption of methylene blue dye from aqueous solution. The as-synthesized MCM-41 was calcined at 250 and 550 oC to study the relation between the surface area and pore volume with surfactant removal. The synthesized MCM-41 was characterized using thermo gravimetric analysis (TGA), X-ray diffraction (XRD) patterns, nitrogen adsorption/desorption isotherms and Fourier transform infrared (FT-IR) spectroscopy. The MCM-41 calcined at 550 oC showed higher surface area (1,059 m2 g−1) with pore volume of 0.89 ml g−1 and was used for the investigation of adsorption isotherms and kinetics. The experimental results indicated that the Freundlich and Redlich-Peterson models expressed the adsorption isotherm better than the Langmuir model. In addition, the influence of temperature and pH on adsorption was also investigated. The decrease in temperature or the increase in pH enhanced the adsorption of dye onto MCM-41. A maximum adsorption capacity of 1.5×10−4 mol g−1 was obtained at 30 oC. The kinetic studies showed that the adsorption of dye on MCM-41 follows the pseudo-second-order kinetics.
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Debashis Kundu,Sankar Chakma,Gopal Pugazhenthi,Tamal Banerjee 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
The current work presents a mechanistic insight of hydrogen production from ammonia borane (AB) facilitated by the phosphonium based ionic liquid (IL), trihexyl(tetradecyl)phosphonium bis (2,4,4-trimethylpentyl) phosphinate ([TDTHP][Phosph]). Prior to experiments, the IL was screened from a pool of 11 phosphonium ILs with the infinite dilution activity coefficients (IDAC) values as predicted by conductor like screening model segment activity coefficient (COSMO-SAC) theory. Thereafter, a dehydrogenation experiment of AB/[TDTHP][Phosph] was carried out at 105 oC and 4×102mbar of gauge pressure, which yielded 2.07 equivalent hydrogen production. At higher temperature, the 11B NMR characterization shows the suppression of induction period at 105 oC and appearance of borohydride anion after 1 min of dehydrogenation. Further, time-resolved characterization of AB/[TDTHP][Phosph] at 105 oC confirmed the appearance of polymeric aminoborane after 10min with a subsequent formation of polyborazylene. HR-MS characterization coupled with 1H resonance spectrum confirmed structural integrity of IL. The dual characterization of NMR and HR-MS led us to propose a dehydrogenation mechanism of AB/[TDTHP][Phosph] system
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Debashis Kundu,Sankar Chakma,Sainiwetha Saikrishnan,Gopal Pugazhenthi,Tamal Banerjee 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-
Dehydrogenation of ethylene diamine bisborane (EDAB) is carried out in 1-ethyl-3-methylimidazoliumhydrogen sulfate ([EMIM][HSO4]) and 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM][HSO4])ionic liquids (ILs) at 40–100 C and 410 2 mbar gauge pressure. Within 30 min, 3.90 and 3.92cumulative equivalent hydrogen generation are measured in EDAB/[EMIM][HSO4] and EDAB/[BMIM][HSO4] respectively at 100 C. NMR characterization elucidates the intermediate and product formationduring dehydrogenation along with the structural integrity of ILs. The EDAB/[EMIM][HSO4] complex isproved to be more stable with an overall interaction energy of471.29 KJ mol 1 when compared to EDAB/[BMIM][HSO4]. Hydrogen bond interactions are further calculated by natural bond orbital analysis.
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