Kera, Nazia HBhaumik, MBallav, NPillay, KRay, Suprakas SMaity, Arjun2017-07-282017-07-282016-08Kera, N.H., Bhaumik, M., Ballav, N. et al. 2016. Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite. Journal of Colloid and Interface Science, vol. 476: 144-157. doi.org/10.1016/j.jcis.2016.05.0110021-9797doi.org/10.1016/j.jcis.2016.05.011http://www.sciencedirect.com/science/article/pii/S002197971630296Xhttp://hdl.handle.net/10204/9425Copyright: 2016 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, kindly consult the publisher's website.A polypyrrole/2,5-diaminobenzenesulfonic acid (PPy/DABSA) composite, synthesised by the in situ oxidative polymerization of pyrrole in the presence of DABSA, was studied as an adsorbent for the removal of Cr(VI) from aqueous solution. The structure and morphology of the composite were investigated by ATR-FTIR, FE-SEM, EDX, TGA, XRD and XPS studies. The adsorption of Cr(VI) by PPy/DABSA composite was highly pH dependent and optimum removal was achieved at pH 2. Adsorption of Cr(VI) was confirmed by EDX and XPS studies. The isotherm data fitted the linear Langmuir model well, with a maximum adsorption capacity of 303 mg/g at 25 °C. Thermodynamic parameters ( G°, H° and S°) were calculated using isotherm data and confirmed that the adsorption process was spontaneous and endothermic. Adsorption kinetics was best described by the pseudo-second-order model. The activation energy of the adsorption process suggested that Cr(VI) was chemisorbed by PPy/DABSA composite. PPy/DABSA composite could be used for three consecutive adsorption-desorption cycles without loss of its original adsorption capacity. Highly selective removal of Cr(VI) was observed even when co-existing ions such as Cu(sup2+), Zn(sup2+), Ni(sup2+), Cl(sup-), SO(sub4)(sup2-) and NO(sub3)(sup-) were present in the solution. In summary, the potential of PPy/DABSA composite for remediating industrial wastewater contaminated by Cr(VI) has been demonstrated.enPolypyrrole2,5-Diaminobenzenesulfonic acidCompositeAdsorptionHexavalent chromiumEquilibriumIsothermsKineticsArticleKera, N. H., Bhaumik, M., Ballav, N., Pillay, K., Ray, S. S., & Maity, A. (2016). Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite. http://hdl.handle.net/10204/9425Kera, Nazia H, M Bhaumik, N Ballav, K Pillay, Suprakas S Ray, and Arjun Maity "Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite." (2016) http://hdl.handle.net/10204/9425Kera NH, Bhaumik M, Ballav N, Pillay K, Ray SS, Maity A. Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite. 2016; http://hdl.handle.net/10204/9425.TY - Article AU - Kera, Nazia H AU - Bhaumik, M AU - Ballav, N AU - Pillay, K AU - Ray, Suprakas S AU - Maity, Arjun AB - A polypyrrole/2,5-diaminobenzenesulfonic acid (PPy/DABSA) composite, synthesised by the in situ oxidative polymerization of pyrrole in the presence of DABSA, was studied as an adsorbent for the removal of Cr(VI) from aqueous solution. The structure and morphology of the composite were investigated by ATR-FTIR, FE-SEM, EDX, TGA, XRD and XPS studies. The adsorption of Cr(VI) by PPy/DABSA composite was highly pH dependent and optimum removal was achieved at pH 2. Adsorption of Cr(VI) was confirmed by EDX and XPS studies. The isotherm data fitted the linear Langmuir model well, with a maximum adsorption capacity of 303 mg/g at 25 °C. Thermodynamic parameters ( G°, H° and S°) were calculated using isotherm data and confirmed that the adsorption process was spontaneous and endothermic. Adsorption kinetics was best described by the pseudo-second-order model. The activation energy of the adsorption process suggested that Cr(VI) was chemisorbed by PPy/DABSA composite. PPy/DABSA composite could be used for three consecutive adsorption-desorption cycles without loss of its original adsorption capacity. Highly selective removal of Cr(VI) was observed even when co-existing ions such as Cu(sup2+), Zn(sup2+), Ni(sup2+), Cl(sup-), SO(sub4)(sup2-) and NO(sub3)(sup-) were present in the solution. In summary, the potential of PPy/DABSA composite for remediating industrial wastewater contaminated by Cr(VI) has been demonstrated. DA - 2016-08 DB - ResearchSpace DP - CSIR KW - Polypyrrole KW - 2,5-Diaminobenzenesulfonic acid KW - Composite KW - Adsorption KW - Hexavalent chromium KW - Equilibrium KW - Isotherms KW - Kinetics LK - https://researchspace.csir.co.za PY - 2016 SM - 0021-9797 T1 - Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite TI - Selective removal of Cr(VI) from aqueous solution by polypyrrole/2,5-diaminobenzene sulfonic acid composite UR - http://hdl.handle.net/10204/9425 ER -