http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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>
Lingamdinne, Lakshmi Prasanna,Koduru, Janardhan Reddy,Chang, Yoon-Young,Karri, Rama Rao Elsevier 2018 Journal of molecular liquids Vol.250 No.-
<P><B>Abstract</B></P> <P>The presence of toxic heavy metals such as Pb(II) in aqueous environments is causing adverse health risks to human beings, motivating researchers to develop efficient techniques to remove pollutants from potable and effluent water. Adsorption was found to be an efficient technique among the various pollutant removal techniques. Efficiency of the adsorption process depends on the adsorbent and its nature. In this regard, a synthesized nickel ferrite-reduced graphene oxide (NFRGO) nano-composite is developed and utilized as an adsorbent to remove heavy metal ions. Since the performance of the adsorption technique depends on independent process variables, the influence of parameters such as the initial solution concentration, adsorbent dosage, and contact residence time on the removal of Pb(II) by NFRGO using a batch adsorption process are systematically studied in this work. Based on the design of experiments approach and central composite design (CCD), twenty experimental runs are performed with each process variable segregated in the experimental range. The optimal values of the independent process variables to achieve maximum removal efficiency are examined using conventional response surface methodology (RSM). A quadratic model, which consists of a first-order and second-order degree regressive model is developed using the analysis of variance (ANOVA) and RSM - CCD framework. Based on the desirability index, the optimum values were found to be an initial concentration of 18.38mg/L, an adsorbent dose of 0.55g/L, and a contact residence time of 83min in order to achieve 99% removal of Pb(II) ions with 0.953 desirability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel synthesized nickel ferrite-reduced graphene oxide (NFRGO) nano-composite is developed. </LI> <LI> Differential evolution approach as an efficient evolutionary optimization technique for optimal parameters. </LI> <LI> Design of experiments done using response surface methodology-central composite design framework </LI> <LI> Optimized characteristic constants representing mechanisms in isotherms models </LI> </UL> </P>