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Influencing factors on sorption of TNT and RDX using rice husk biochar
Lingamdinne, Lakshmi Prasanna,Roh, Hoon,Choi, Yu-Lim,Koduru, Janardhan Reddy,Yang, Jae-Kyu,Chang, Yoon-Young Elsevier 2015 Journal of industrial and engineering chemistry Vol.32 No.-
<P><B>Abstract</B></P> <P>2,4,6-Trinitrotoluene (TNT) and 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) are the most commonly used nitro-organic explosives in contemporary military munitions, and readily be introduced into the environment, especially in groundwater supplies. In the present study, rice husk biochar (RHBC) prepared by pyrolysis at 700°C was used for the treatment of TNT and RDX in waste water by batch sorption. The prepared RHBC chemical and physical characteristics were well characterized using analytical spectroscopic techniques. In order to develop the sorption mechanism of TNT and RDX onto RHBC, the factors influencing sorption were studied. The results demonstrated that TNT and RDX sorption depended on the pH value of the aqueous solution, and decreased as pH increased from 2.0 to 6.0 and was attributed with their p<I>K</I>a<SUB>1</SUB> values along with their physical and chemical characteristics. The batch sorption results revealed that the sorption of the two explosives onto RHBC was rate limiting monolayer chemisorptions on homogeneous surface. These results suggested that the sorption of TNT and RDX occurs through weak electrostatic interactions as well as through charge transfer between –NO<SUB>2</SUB> and ππ electrons of explosives and RHBC surface functional groups.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Characterized rice husk biochar (RHBC) prepared at various pyrolysis temperatures. </LI> <LI> Sorption characteristics of TNT and RDX onto RHBC were well studied. </LI> <LI> Well explained the pH influenced sorption mechanism of TNT and RDX onto RHBC. </LI> <LI> Sorption mechanism of explosives explained with spectral evidence. </LI> <LI> Sorption of TNT and RDX on to RHBC occurs to through complex mechanism. </LI> </UL> </P>
Lingamdinne, Lakshmi Prasanna,Koduru, Janardhan Reddy,Karri, Rama Rao Elsevier 2019 Journal of Environmental Management Vol.231 No.-
<P><B>Abstract</B></P> <P>With the rapid growth of industrialization, water bodies are polluted with heavy metals and toxic pollutants. In pursuit of removal of toxic pollutants from the aqueous environment, researchers have been developed many techniques. Among these techniques, magnetic separation has caught research attention, as this approach has shown excellent performance in the removal of toxic pollutants from aqueous solutions. However, magnetic graphene oxide based nanocomposites (MGO) possess unique physicochemical properties including excellent magnetic characteristics, high specific surface area, surface active sites, high chemical stability, tunable shape and size, and the ease with which they can be modified or functionalized. As results of their multi-functional properties, affordability, and magnetic separation capability, MGO's have been widely used in the removal of heavy metals, radionuclides and organic dyes from the aqueous environment, and are currently attracting much attention. This paper provides insights into preparation strategies and approaches of MGO's utilization for the removal of pollutants for sustainable water purification. It also reviews the preparation of magnetic graphene oxide nanocomposites and primary characterization instruments required for the evaluation of structural, chemical and physical functionalities of synthesized magnetic graphene oxide nanocomposites. Finally, we summarized some research challenges to accelerate the synthesized MGO's as adsorbents for the treatment of water pollutants such as toxic and radioactive metal ions and organic and agricultural pollutants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recent status of the synthetic magnetic adsorbents applications for water-purification. </LI> <LI> Preparation strategies of magnetic graphene oxide (MGO) nanocomposites. </LI> <LI> MGO's nanocomposites characterization strategies are well reviewed. </LI> <LI> Extensively reviews the status and approaches of MGO's for the removal of pollutants. </LI> <LI> Highlighted the future prospective and advantages of the MGO's at conclusions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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.
Lingamdinne, Lakshmi Prasanna,Koduru, Janardhan Reddy,Chang, Yoon-Young,Kang, Seon-Hong,Yang, Jae-Kyu Elsevier 2019 Journal of molecular liquids Vol.279 No.-
<P><B>Abstract</B></P> <P>In this work, the surface of graphene oxide was functionalized with lanthanum to produce porous flowered graphene oxide‑lanthanum fluoride (GO-LaF) nanocomposite for adsorptive removal of As(V) from aqueous system. GO-LaF nanocomposite was characterized by TEM, SEM, XRD, and XPS analysis. Maximum adsorption capacity for As(V) was 18.52 mg g<SUP>−1</SUP> (at 298 K) and was dependent on the solution pH, adsorbent mass, contact time and As(V) concentration. Pseudo-second-order kinetic model provided excellent kinetic data fitting. The isotherm data were well-fitted to the Langmuir equation. Adsorption results obtained at different conditions suggest that As(V) adsorption onto GO-LaF occurs through mixed processes such as electrostatic, ion-exchange, and surface complexation. Electrostatic interactions were predominantly involved in the adsorption process at low pH while surface complexation and/or ion-exchange were predominantly involved above neutral pH.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spectral studies confirmed the synthesis of graphene oxide‑lanthanum fluoride (GO-LaF). </LI> <LI> Characterization results conferred flowered mesoporous nano-sized GO-LaF. </LI> <LI> Arsenate adsorption was rate-controlled monolayer adsorption on homogeneous GO-LaF. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>