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Smita Gupta,Mousumi Chakraborty,Z.V.P. Murthy 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this work, extraction of bisphenol A (BPA) from aqueous solutions by hollow fiber supported liquid membrane is studied. The study had focused on the effects of various parameters, viz., hydrodynamic conditions, type of diluent, feed- and stripping- phase concentrations. Response surface method was adopted to determine the interactive effect of feed and stripping phase concentrations on BPA transport. At optimum conditions, 96% BPA extraction is achieved from aqueous solutions within 9.0 h cycle-time. A mass transfer model was developed, and the aqueous and membrane resistances were evaluated to be 5.78 × 102 s cm-1 and 5.85 × 104 s cm-1, respectively.
Hollow mesoporous silica spheres supported Ag and Ag–Au catalyzed reduction of 4-nitrobenzo-15-crown
Raji Vadakkekara,Mousumi Chakraborty,Parimal A. Parikh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Hollow mesoporous silica (HMS) spheres of size within the range 120–220 nm have been prepared usingpropanol–water solvent as template and cetyltrimethylammonium bromide (CTAB) as stabilizer. HMSsupported silver and silver–gold catalysts were prepared by impregnating metal nanoparticles on HMSand were characterized by ultraviolet–visible spectroscopy (UV–vis), dynamic light scattering (DLS),optical microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transforminfrared spectroscopy (FTIR), inductive coupled plasma optical emission spectroscopy (ICP-OES) and N2adsorption–desorption. The reduction of 4-nitrobenzo-15-crown (4-NB-15-C) was compared using HMSsupported silver and silver–gold nanocatalysts varying experimental parameters. Bimetallic Ag–Au/HMS nanocatalysts was found to be more active than monometallic Ag/HMS nanocatalyst.
Chetan M. Patel,Mousumi Chakraborty,Z.V.P. Murthy 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
A systematic study on wet grinding of barium sulfate to produce nanoparticles (<50 nm) was performed in a stirred media mill. The suspension stabilization by pH adjustment and dispersants addition were investigated using zeta potential measurement and the multiple light scattering methods. It was found that particle size reduction requires use of dispersant (sodium salt of polyacrylic acid). The optimum amount of dispersant concentration was determined to be 2% by weight. Further, the influence of pinlength was found to improve the performance. The influence of solids mass fraction, grinding media diameter on pH variation and final size were evaluated.
Enhancement of stirred media mill performance by a new mixed media grinding strategy
Chetankumar M. Patel,Mousumi Chakraborty,Z.V.P. Murthy 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Wet grinding experiments were carried out to optimize the cost of grinding media and energy consumption by adding different amount of finer to coarser grinding media. The effects of amount of finer media and finer to coarser grinding media size ratio were investigated. Much smaller product particle sizes were obtained with lesser amount of energy consumption by mixed media grinding. Nanogrinding performance was evaluated by mixing grinding media of different sizes based on the stress energy model. Rheological analysis of ground nanosuspension was conducted to elucidate the role of finer grinding media to improve the wet grinding process.