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Ballav, N.,Choi, H.J.,Mishra, S.B.,Maity, A. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.6
Fe<SUB>3</SUB>O<SUB>4</SUB> coated glycine doped polypyrrole magnetic nanocomposite (Fe<SUB>3</SUB>O<SUB>4</SUB>χly-PPy NC) was prepared via coating of suspended Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles with gly-PPy. FE-SEM and HR-TEM images indicated that Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles were encapsulated by precipitating gly-PPy moieties. Chromium(VI) adsorption followed a Langmuir isotherm with maximum capacity of 238-303mg/g for a temperature range of 25-45<SUP>o</SUP>C at pH 2. The adsorption process was governed by the ionic interaction and the reduction of Cr(VI) to Cr(III) by the PPy moiety. Results showed that NCs are effective adsorbents for the removal of Cr(VI) from wastewater and can be separated by external magnetic field from the reactor.
Ballav, N.,Choi, H.J.,Mishra, S.B.,Maity, A. Elsevier 2014 Applied clay science Vol.102 No.-
A polypyrrole-coated halloysite nanotube nanocomposite (PPy-HNTs NC) was prepared via in situ polymerization of pyrrole (Py) in the dispersion of HNTs and assessed for the removal of toxic Cr(VI) from aqueous solutions. ATR-FTIR and XRD results confirmed the formation of the nanocomposite. The FE-SEM and TEM images revealed the coating of PPy in the halloysite matrix and the surface morphology of the PPy-HNTs NC. Batch adsorption study showed that the adsorption process was very fast and kinetic data well fitted with pseudo-second-order kinetic model. Adsorption isotherms followed the Langmuir isotherm model and the maximum adsorption capacity was found to be 149.25mg/g at pH2.0 at 25<SUP>o</SUP>C. The adsorption process was spontaneous and endothermic in nature. XPS study confirmed the adsorption of Cr(VI) onto the NC where some part of Cr(VI) reduced to Cr(III) by electron-rich PPy moiety. The desorption study suggested that the nanocomposite (NC) can be reused three times without loss of its original removal efficiency. Tests on contaminated groundwater and chrome mine water indicated the potential applicability of the adsorbents for the removal of Cr(VI) for actual field application.
N. Ballav,최형진,S.B. Mishra,A. Maity 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Fe3O4 coated glycine doped polypyrrolemagnetic nanocomposite (Fe3O4@gly-PPy NC) was prepared viacoating of suspended Fe3O4 nanoparticles with gly-PPy. FE-SEM and HR-TEM images indicated thatFe3O4 nanoparticles were encapsulated by precipitating gly-PPy moieties. Chromium(VI) adsorptionfollowed a Langmuir isothermwith maximum capacity of 238–303 mg/g for a temperature range of 25–45 ℃ at pH 2. The adsorption process was governed by the ionic interaction and the reduction of Cr(VI) toCr(III) by the PPy moiety. Results showed that NCs are effective adsorbents for the removal of Cr(VI) fromwastewater and can be separated by external magnetic field from the reactor.
H. Mittal,N. Ballav,Shivani B. Mishra 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
This article reports the development and biosorption properties of iron oxide magnetic nanoparticles incorporated Gum ghatti based nanocomposites for the remediation of methylene blue contaminated water. The physico-chemical and structural characterization confirmed the incorporation of Fe3O4 MNPs with in the polymer matrix. Adsorption kinetics followed pseudo second order rate model. Adsorption isotherm fitted well with the Langmuir adsorption isotherm with the maximum adsorption capacity of 671.14 mg/g. Thermodynamic parameters like △S0, △H0 and △G0 were investigated and the desorption studies showed that the nanocomposite can be regenerated and reused for the removal of methylene blue.