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Singh S.,University under Section 3 of Act 1956 | Shukla S.R.,University under Section 3 of Act 1956
Environmental Progress and Sustainable Energy | Year: 2017

The potential of an agro industrial waste Citrus limetta peels (CLP) for biosorption of Ni(II) ions from aqueous solution was explored in batch system in terms of equilibrium, kinetics and thermodynamics. The peels were characterized by FTIR spectroscopy, TGA analysis, and SEM. The effect of process parameters such as initial pH, metal ion concentration, biosorbent dosage and contact time on metal ion sorption was examined. The optimum values for pH and biosorbent dose for Ni(II) sorption were 6 and 2 g/L, with time for equilibrium adsorption 45 min. Application of the experimental data to several kinetic models and adsorption isotherms showed that the adsorption process follows a pseudo second order and Langmuir isotherm. The maximum adsorption capacity was found to be 27.78 mg/g. Elution efficiency was determined with different concentrations of HCl. Effect of various competing ions on sorption was also evaluated. The study was extended to metal sorption from synthetic wastewater. Results indicate that the CLP can be an effective and environmentally friendly adsorbent to detoxify Ni(II)-polluted wastewater. The high nickel adsorption capacity of CLP suggests its utility on industrial scale. © 2017 American Institute of Chemical Engineers Environ Prog.

Shukla S.R.,University under Section 3 of Act 1956 | Kapadi P.U.,University under Section 3 of Act 1956 | Mhaske S.T.,University under Section 3 of Act 1956 | Mali M.N.,University under Section 3 of Act 1956 | More A.,University under Section 3 of Act 1956
Journal of Vinyl and Additive Technology | Year: 2015

This study focuses on the synthesis and application of didecanoate of bis(3-hydroxypropyl) terephthalamide (DD-BHPTA) as a secondary plasticizer in poly(vinyl chloride) (PVC) compounding. DD-BHPTA was synthesized from poly(ethylene terephthalate) bottle waste through aminolysis followed by condensation reaction with decanoic acid. Synthesized DD-BHPTA was characterized by Fourier-transform infrared spectroscopy, differential scanning calorimetry, and nuclear magnetic resonance. Plasticized PVC was prepared by compounding PVC in different ratios with DD-BHPTA and dioctyl phthalate (DOP) using a two-roll mill. This newly synthesized plasticizer completely fused with PVC. The mechanical, thermal, and rheological properties like glass transition temperature, tensile strength, % elongation, dynamic mechanical analysis, solvent resistance, accelerated ultraviolet weathering test for color stability, differential scanning calorimetry, and thermal gravimetric analysis of plasticized PVC were investigated. DD-BHPTA along with DOP plasticizer demonstrated plasticization efficiency similar to that of DOP alone, with the same plasticizer loading. DD-BHPTA was found to be the more efficient plasticizer when used in combination with DOP. Thus, DD-BHPTA can be used as a secondary plasticizer for DOP and can substitute DOP up to 50% of plasticizer loading. © 2015 Society of Plastics Engineers.

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