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Influencing factors on sorption of TNT and RDX using rice husk biochar
Lakshmi Prasanna Lingamdinne,장윤영,Hoon Roh,최유림,Janardhan Reddy Koduru,양재규 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
2,4,6-Trinitrotoluene (TNT) and 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) are the most commonlyused nitro-organic explosives in contemporary military munitions, and readily be introduced into theenvironment, especially in groundwater supplies. In the present study, rice husk biochar (RHBC)prepared by pyrolysis at 700 8C was used for the treatment of TNT and RDX in waste water by batchsorption. The prepared RHBC chemical and physical characteristics were well characterized usinganalytical spectroscopic techniques. In order to develop the sorption mechanism of TNT and RDX ontoRHBC, the factors influencing sorption were studied. The results demonstrated that TNT and RDXsorption depended on the pH value of the aqueous solution, and decreased as pH increased from 2.0 to6.0 and was attributed with their pKa1 values along with their physical and chemical characteristics. Thebatch sorption results revealed that the sorption of the two explosives onto RHBC was rate limitingmonolayer chemisorptions on homogeneous surface. These results suggested that the sorption of TNTand RDX occurs through weak electrostatic interactions as well as through charge transfer between –NO2 and p–p electrons of explosives and RHBC surface functional groups.
Synthesis of porous gadolinium oxide for adsorption removal of Arsenic from aqueous solution
( Lakshmi Prasanna Lingamdinne ),이수현,최종수,( Ganesh Kumar Reddy ),장윤영,양재규,( Koduru Janardhan Reddy ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Inorganic arsenic occurs in -3, 0, +3, and +5 oxidation states in aquatic systems. Among several oxidation states, As(III) and As(V) are the most common in natural water or groundwater. The rapid industrialization and urbanization activities and other anthropogenic activities are the primary sources for the arsenic releases into the water. Groundwater contaminated with arsenic over a while has led to a massive arsenic poisoning. In the present paper, a novel porous nano metal oxide (Gadolinium oxide) has been synthesized by a freeze-drying method and characterized to test the ability of gadolinium oxide (Gd<sub>2</sub>O<sub>3</sub>) to remove As(V) from the aqueous matrix. The maximum adsorption was appraised in this research, besides fitting the adsorption data to various equations to obtain certain constants related to the adsorption phenomena.