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파와,Lalhmunsiama,Hari C. Bajaj,이승목 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
In this study, the effects of acid activation with high bentonite contents under mild synthetic conditionson textural and structural properties were explored. The alteration features after activation were fullycharacterized with the help of X-ray powder diffraction (XRD), X-ray fluorescence (XRF), Fouriertransform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) surface area, Barrett–Joyner–Halenda (BJH) pore size and volume analyses. The active siteswere examined using volumetric titration and confirmed with a pyridine adsorbed FT-IR study. Theactivated bentonite (ABn) was further utilized for the removal of Cu(II) and Pb(II) ions from aqueoussolutions. Batch reactor studies showed that the removal of these toxic metal ions was favored byincreases in the pH, initial metal concentrations, contact time, and dose of the adsorbents. Theequilibrium data obtained at various initial concentrations reasonably fit well with the Langmuir andFreundlich adsorption isotherms. The adsorption process was fast and the kinetic data fit better to thepseudo-second order kinetic model. The presence of other heavy metal ions, such as Cd(II), Fe(II), andMn(II), did not significantly suppress the removal of both the Cu(II) and Pb(II); whereas the other cations,such as Na+, K+, Ca2+, and Mg2+ caused a notable decrease in the Pb(II) removal. In addition, thebreakthrough data obtained in the column studies fit well with the non-linear Thomas equation, andhigh loading capacities of Cu(II) and Pb(II) were obtained. Therefore, we demonstrated in this study thatthe low cost ‘ABn’ solid can be employed as a potential adsorbent for the effective treatment of aqueouswaste contaminated with Cu(II) and Pb(II).
Kalithasan Natarajan,Hari C. Bajaj,Rajesh J. Tayade 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
BiOX (X = Br, Cl and I) nanoplate photocatalysts were synthesized by hydrothermal method. Thephotocatalytic activity of the synthesized catalysts was evaluated for RhB dye degradation under fourtypes of light emitting diodes (LEDs) irradiation possesses different wavelength. 100% RhB dyedegradation was achieved for BiOCl and BiOBr catalysts within 120 and 240 min under UVLEDirradiation. Whereas BiOI catalyst owns 83.4% degradation under red LED (RLED) irradiation at the end of240 min. Our study reveals that BiOI photocatalyst could be effective for RhB dye degradation undercheaper RLED irradiation rather than UVLED.
Ingole, Pravin G.,Bajaj, Hari C.,Singh, Kripal Techno-Press 2013 Advances in materials research Vol.2 No.1
Enantioselective macromer of trimesic acid was prepared using S(-) menthol with trimesoyl chloride on polyimide (PI) ultrafiltration membrane. The chemical composition of macromer as well as polyimide ultrafiltration membrane was determined by ATR-FTIR Spectroscopy. The optical resolution of chiral alcohols was performed in pressure driven process. The effect of monomer solutions concentration, effect of air-drying time of S(-) menthol solution, effect of reaction time, effect of operating pressure, effect of feed concentration of racemate on the performance of macromer was studied. The synthesised material exhibits separation of chiral alcohols (menthol ~23% and sobrelol ~21%).