Setshedi, Katlego ZBhaumik, MSongwane, Snyango, MSMaity, Arjun2013-05-212013-05-212013Setshedi, K.Z, Bhaumik, M, Songwane, S, Onyango, M.S and Maity, A. 2013. Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal. Chemical Engineering Journal, vol. 222, pp186-1971385 8947http://www.sciencedirect.com/science/article/pii/S1385894713002271http://hdl.handle.net/10204/6743Copyright: 2013 Elsevier. This is the ABSTRACT ONLY. The definite version is published in Chemical Engineering Journal, vol. 222, pp186-197Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite (PPy OMMT NC), was prepared as a potential adsorbent, via in situ polymerization of pyrrole monomer for adsorption of toxic Cr(VI) from aqueous solution. The WAXD and SAXS results indicated that the clay sheets were exfoliated in the prepared nanocomposite. HR-TEM results showed good dispersion of the clay into the polymer matrix. The presence of the PPy polymer in the nanocomposite and adsorption of Cr(VI) onto the nanocomposite were confirmed using ATR-FTIR. Using the BET method, an improved surface area was observed for the PPy-OMMT NC compared to native clay. Batch adsorption studies whereby the pH, initial Cr(VI) concentration, sorbent dosage and temperature were varied, revealed that Cr(VI) adsorption process was rapid, spontaneous in nature and favoured with increased temperature at pH 2. The kinetic data fitted well to the pseudo second order kinetic model while the equilibrium data was satisfactorily described by the Langmuir isotherm. The Langmuir maximum adsorption capacity of Cr(VI) onto PPy-OMMT NC at pH 2.0 was found to be 112.3, 119.34, 176.2 and 209.6 mg/g at 292 K, 298 K, 308 K and 318 K, respectively. The selective adsorption of Cr(VI) was demonstrated in binary adsorption systems with co-existing ions. Moreover, desorption experiments revealed that the nanocomposite can be reused effectively for two consecutive adsorption–desorption cycles without any loss of its original capacity. Groundwater test results showed that the nanocomposite is a potential adsorbent for Cr(VI) ion removal from contaminated water sources.enExfoliated nanocompositePolypyrroleAdsorptionChromium(VI)Equilibrium isothermKineticsMontmorillonite clayArticleSetshedi, K. Z., Bhaumik, M., Songwane, S., nyango, M., & Maity, A. (2013). Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal. http://hdl.handle.net/10204/6743Setshedi, Katlego Z, M Bhaumik, S Songwane, MS nyango, and Arjun Maity "Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal." (2013) http://hdl.handle.net/10204/6743Setshedi KZ, Bhaumik M, Songwane S, nyango M, Maity A. Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal. 2013; http://hdl.handle.net/10204/6743.TY - Article AU - Setshedi, Katlego Z AU - Bhaumik, M AU - Songwane, S AU - nyango, MS AU - Maity, Arjun AB - Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite (PPy OMMT NC), was prepared as a potential adsorbent, via in situ polymerization of pyrrole monomer for adsorption of toxic Cr(VI) from aqueous solution. The WAXD and SAXS results indicated that the clay sheets were exfoliated in the prepared nanocomposite. HR-TEM results showed good dispersion of the clay into the polymer matrix. The presence of the PPy polymer in the nanocomposite and adsorption of Cr(VI) onto the nanocomposite were confirmed using ATR-FTIR. Using the BET method, an improved surface area was observed for the PPy-OMMT NC compared to native clay. Batch adsorption studies whereby the pH, initial Cr(VI) concentration, sorbent dosage and temperature were varied, revealed that Cr(VI) adsorption process was rapid, spontaneous in nature and favoured with increased temperature at pH 2. The kinetic data fitted well to the pseudo second order kinetic model while the equilibrium data was satisfactorily described by the Langmuir isotherm. The Langmuir maximum adsorption capacity of Cr(VI) onto PPy-OMMT NC at pH 2.0 was found to be 112.3, 119.34, 176.2 and 209.6 mg/g at 292 K, 298 K, 308 K and 318 K, respectively. The selective adsorption of Cr(VI) was demonstrated in binary adsorption systems with co-existing ions. Moreover, desorption experiments revealed that the nanocomposite can be reused effectively for two consecutive adsorption–desorption cycles without any loss of its original capacity. Groundwater test results showed that the nanocomposite is a potential adsorbent for Cr(VI) ion removal from contaminated water sources. DA - 2013 DB - ResearchSpace DP - CSIR KW - Exfoliated nanocomposite KW - Polypyrrole KW - Adsorption KW - Chromium(VI) KW - Equilibrium isotherm KW - Kinetics KW - Montmorillonite clay LK - https://researchspace.csir.co.za PY - 2013 SM - 1385 8947 T1 - Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal TI - Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal UR - http://hdl.handle.net/10204/6743 ER -