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Shraddha Mishra,Nishith Verma 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Novel triethanol amine-grafted hollow carbon nanofibers (CNFs), supported on carbon beads, weresynthesized via templating method for the removal of hexavalent chromium (Cr(VI)) ions from water. CNFs were grown on carbon beads by chemical vapor deposition using the in situ incorporated Crnanoparticles in the beads, as the catalyst. The beads were ultra-sonicated to remove the nanoparticlesfrom the tip of the CNFs, thereby creating the hollow CNFs. The Cr(VI)-adsorption capacity of the materialwas determined to be 51 mg/g at 125 ppm-initial concentration and 4.5-solution pH. Negligibleinterference from coexisting metal ions in water was found with the Cr(VI)-adsorption.
Preparation of Activated Carbon Fibers from Cost Effective Commercial Textile Grade Acrylic Fibers
Mekala Bikshapathi,Nishith Verma,Rohitashaw Kumar Singh,Harish Chandra Joshi,Anurag Srivastava 한국탄소학회 2011 Carbon Letters Vol.12 No.1
Activated carbon fibers (ACFs) were prepared from cost effective commercial textiles through stabilization, carbonization, and subsequently activation by carbon dioxide. ACFs were characterized for surface area and pore size distribution by physical adsorption of nitrogen at 77 K. ACFs were also examined for various surface characteristics by scanning electron microscopy, Fourier transform infrared spectroscopy, and CHNO elemental analyzer. The prepared ACFs exhibited good surface textural properties with well developed micro porous structure. With improvement in physical strength, the commercial textile grade acrylic precursor based ACFs developed in this study may have great utility as cost effective adsorbents in environmental remediation applications.
Ashish Yadav,Nishith Verma 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.67 No.-
Copper nanoparticle-doped and graphitic carbon nanofibers-covered porous carbon beads were used as an efficient catalyst for treating synthetic phenolic water by catalytic wet air oxidation (CWAO) in a packed bed reactor over 10–30 bar and 180–230 °C, with air and water flowing co-currently. A mathematical model based on reaction kinetics assuming degradation in both heterogeneous and homogeneous phases was developed to predict reduction in chemical oxygen demand (COD) under a continuous operation with recycle. The catalyst and process also showed complete COD reduction (>99%) without leaching of Cu against a high COD (∼120,000 mg/L) containing industrial wastewater.
Mohit Yadav,Amol Pophali,Nishith Verma,김태진 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
Conversion of volatile organic compounds (VOCs) such as toluene and xylene to less harmful CO2 and H2Ovia catalytic oxidation over the metal oxide-impregnated activated carbon beads is a viable solution forcontrolling emission of the pollutants. The poly(furfuryl) alcohol (PFA) precursor-based carbon beads( 0.8 mm) were synthesized via suspension polymerization. The metal-salt was in situ dispersed inthe polymerization reaction mixture, and PFA-supported Ni was carbonized (C) and steam activated(A). Decomposition of toluene ( 2000 ppm) and xylene ( 400 ppm) at 500 C over the supported metaloxide catalysts followed the trend: NiO > CoO > CuO > FeO. Approximately 8.5% (w/w) NiO loadingshowed the highest VOC decomposition rate. The present results revealed that NiO-PFA/C/A was stableunder the experimental VOC oxidation reaction conditions, and is an efficient oxidation catalyst for controllingVOC emissions under a continuous operation.