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Pradip Bhattacharyya,Kalyan Chakrabarti,Asish Chakraborty,Subhasish Tripathy,M.A. Powell 한국지질과학협의회 2008 Geosciences Journal Vol.12 No.1
Effect of addition of municipal solid waste compost(MSWC) on lead (Pb) content of submerged rice paddies wasstudied. Experiments were conducted during the three consecutivewet seasons from 1997 to 1999 on rice grown under submergence,tial extraction method was used to determine the Pb fractions inMSWC and decomposed cow manure (DCM). Lead was signifi-cantly bound to the organic matter (60%) and Fe and Mn oxidesin MSWC and DCM. Lead content (mg kg-1) in rice straw washigher than in rice grain. Lead bound with water soluble andexchangeable fractions in MSWC and DCM was best correlatedwith straw and grain Pb. Fe and Mn oxide bound Pb in both theorganics also significantly correlated with straw and grain Pb con-Pb in MSWC and DCM did not significantly corelate with Pbcontent in rice straw and grain metal. MSWC would be a valuableresource for agriculture if it can be used safely, but long-term fieldexperiments with MSWC are needed to assess by regular moni-toring of the metal loads and accumulation in soil and plants.
An ultralight porous alumina ceramic in the image of jute stem
Pijush Kanti Mandal,Kalyan Kumar Mukherjee,Omprakash Chakrabarti,Himadri Sekhar Maiti,Rabindranath Majumdar 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
A carbonaceous preform (C-preform) was prepared by thermal and microwave (MW) processing of short lengths (0.02- 0.06 m) of dry stems of jute (Corchorus capsularis L). Infiltration of an Al2O3-sol into the C-preforms and a subsequent oxidising heat treatment (1273-1723 K) resulted in the formation of an ultralight monophasic Al2O3 ceramic (bulk density ~200 kg·m−3) with perfect replication of the pore structure of the starting C-preforms derived from the jute stems (JS). The cellular porous alumina ceramics derived from JS having special morphologies with a long, large and oriented growth of alpha alumina grains are likely to be suitable for devices such as high temperature insulators, catalyst supports, permeators for gas phase reactions at elevated temperatures, and biomaterials such as for controlled drug release devices. A carbonaceous preform (C-preform) was prepared by thermal and microwave (MW) processing of short lengths (0.02- 0.06 m) of dry stems of jute (Corchorus capsularis L). Infiltration of an Al2O3-sol into the C-preforms and a subsequent oxidising heat treatment (1273-1723 K) resulted in the formation of an ultralight monophasic Al2O3 ceramic (bulk density ~200 kg·m−3) with perfect replication of the pore structure of the starting C-preforms derived from the jute stems (JS). The cellular porous alumina ceramics derived from JS having special morphologies with a long, large and oriented growth of alpha alumina grains are likely to be suitable for devices such as high temperature insulators, catalyst supports, permeators for gas phase reactions at elevated temperatures, and biomaterials such as for controlled drug release devices.