@article { ISI:000348358200057, title = {Bronsted acidic ionic liquid-catalyzed conversion of hemicellulose into sugars}, journal = {Catalysis Science \& Technology}, volume = {5}, number = {1}, year = {2015}, month = {SEP}, pages = {531-539}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Development of a competent method for the conversion of hemicellulose, a lignocellulosic component, into sugars is essential. In a one-pot method, Bronsted acidic ionic liquid (BAIL)-catalyzed hydrolysis of hardwood hemicellulose at 160 degrees C in water media gave C5 sugars (xylose + arabinose) in 87\% yield. The efficiency of the ILs and their acid strength both followed the similar trend, [C3SO3HMIM][HSO4] \> [C3SO3HMIM][PTS] \> [C3SO3HMIM][Cl] \> [BMIM][Cl]. The ion-dipole-type interaction present between the BAIL and the substrate, which is proposed by the H-1 NMR study, is suggested to help in achieving better activity with BAIL than with mineral acid, H2SO4.

}, issn = {2044-4753}, doi = {10.1039/c4cy01047g}, author = {Matsagar, Babasaheb M. and Dhepe, Paresh Laxmikant} } @article { ISI:000365217600004, title = {Conversion of concentrated sugar solutions into 5-hydroxymethyl furfural and furfural using Bronsted acidic ionic liquids}, journal = {Catalysis Science \& Technology}, volume = {5}, number = {12}, year = {2015}, month = {SEP}, pages = {5086-5090}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

Catalytic amounts of recyclable Bronsted acidic ionic liquids (BAILs) yielded HMF (73\%) and furfural (81\%) with high selectivity from highly concentrated solutions of D-fructose (40 wt\%) and D-xylose (3 wt\%), respectively. With a 6 wt\% D-xylose solution, 73\% yield was observed. An activity-property correlation of BAIL is established.

}, issn = {2044-4753}, doi = {10.1039/c5cy00858a}, author = {Matsagar, Babasaheb M. and Munshi, Mudassir K. and Kelkar, Ashutosh A. and Dhepe, Paresh Laxmikant} } @article {44152, title = {Direct production of furfural in one-pot fashion from raw biomass using bronsted acidic ionic liquids}, journal = {Scientific Reports}, volume = {7}, year = {2017}, month = {OCT}, pages = {Article Number: 13508}, type = {Article}, abstract = {The conversion of raw biomass into C5-sugars and furfural was demonstrated with the one-pot method using Bronsted acidic ionic liquids (BAILs) without any mineral acids or metal halides. Various BAILs were synthesized and characterized using NMR, FT-IR, TGA, and CHNS microanalysis and were used as the catalyst for raw biomass conversion. The remarkably high yield (i.e. 88\%) of C5 sugars from bagasse can be obtained using 1-methyl-3(3-sulfopropyl)-imidazolium hydrogen sulfate ([C3SO3HMIM][HSO4]) BAIL catalyst in a water medium. Similarly, the [C3SO3HMIM][HSO4] BAIL also converts the bagasse into furfural with very high yield (73\%) in one-pot method using a water/toluene biphasic solvent system.}, doi = {10.1038/s41598-017-13946-4}, author = {Matsagar, Babasaheb M. and Hossain, Shahriar A. and Islam, Tofazzal and Alamri, Hatem R. and Alothman, Zeid A. and Yamauchi, Yusuke and Dhepe, Paresh L. and Wu, Kevin C. W.} } @article {43835, title = {ffects of cations, anions and H+ concentration of acidic ionic liquids on the valorization of polysaccharides into furfural}, journal = {New Journal of Chemistry}, volume = {41}, year = {2017}, month = {JUL}, pages = {6137-6144}, type = {Article}, abstract = {The valorization of hemicellulose into valuable chemicals, such as C5 sugars and furfural, in a one-pot fashion is crucial. In this work, acidic ionic liquids in the presence of water showed high yields of C5 sugars (>80\%) with >99\% conversion of hemicelluloses at 160 degrees C. With a water + toluene biphasic solvent system, within 4 h, an 85\% furfural yield was obtained directly from hemicellulose in a one-pot fashion using a catalytic amount of 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate. It was seen that Bronsted acidic ionic liquids (BAILs) perform better than solid acid [Faujasite and Mordenite zeolites; ion exchange resin, Amberlyst-15] and mineral catalysts [HCl and H2SO4]. The higher activity of BAILs compared to solid acids and mineral acids was correlated to the Hammett acidity function (Ho) and ion-dipole type of interactions. The catalysts were characterized using NMR (H-1 and C-13), elemental analysis and TGA to confirm that they were stable under reaction conditions and were thus recyclable.}, doi = {10.1039/c7nj00342k}, author = {Matsagar, Babasaheb M. and Dhepe, Paresh L.} } @article {45447, title = { Glucose isomerization catalyzed by bone char and the selective production of 5-hydroxymethylfurfural in aqueous media}, journal = {Sustainable Energy \& Fuels}, volume = {2}, year = {2018}, month = {OCT}, pages = { 2148-2153}, type = {Article}, abstract = {The selective production of 5-hydroxymethylfurfural (HMF) is important, and it is difficult with glucose substrates in a water solvent. Here we demonstrate a selective method for glucose-to-HMF conversion using the combined catalysis of bone char and 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate acidic ionic liquid catalysts with a high HMF selectivity (54\%) in water.}, issn = {2398-4902}, doi = {10.1039/c8se00339d}, author = {Matsagar, Babasaheb M. and Van Nguyen, Chi and Hossain, Md. Shahriar A. and Islam, Md. Tofazzal and Yamauchi, Yusuke and Dhepe, Paresh L. and Wu, Kevin C. -W.} } @article {44634, title = {High surface area nanoporous carbon derived from high quality jute from Bangladesh}, journal = {Materials Chemistry and Physics}, volume = {216}, year = {2018}, month = {SEP}, pages = {491-495}, type = {Article}, abstract = {

We report an economically viable and environment-friendly strategy for the preparation of nanoporous carbon (NC) from jute which is one of the most abundant natural fibers produced in Bangladesh and some South Asian countries. Nitrogen adsorption-desorption isotherms, X-ray diffraction, Raman spectroscopy, UV spectroscopy, and scanning/transmission electron microscopy were performed to characterize the obtained NC. Three different types of jute-derived NCs have been synthesized at three different temperatures, 700 degrees C, 800 degrees C and 900 degrees C. The NC prepared at 800 degrees C resulted in a high surface area (981 m(2) g(-2)) and was associated with the retention of the original fibrous shapes. This study shows a promising future for jute as a natural precursor for NCs for a myriad of applications ranging from water purification to gas separation to energy conversion and storage.

}, keywords = {Adsorbents, Graphitization, Jute, Nanoporous carbons, porous materials}, issn = {0254-0584}, doi = {10.1016/j.matchemphys.2018.05.082}, author = {Khan, Junayet Hossain and Lin, Jianjian and Young, Christine and Matsagar, Babasaheb M. and Wu, Kevin C. W. and Dhepe, Paresh L. and Islam, Md Tofazzal and Rahman, Md Mahbubur and Shrestha, Lok Kumar and Alshehri, Saad M. and Ahamad, Tansir and Salunkhe, Rahul R. and Kumar, Nanjundan Ashok and Martin, Darren J. and Yamauchi, Yusuke and Hossain, Md Shahriar A.} }