Nickel azamacrocyclic complex activated persulphate based oxidative degradation of methyl orange: recovery and reuse of complex using adsorbents. Issue 40 (2nd April 2015) - Subramanian, Gokulakrishnan
Abstract : The use of adsorbents for the recovery and reuse of metal complex based persulphate activator is demonstrated. Abstract : Adsorbents are useful for the removal of metal complex based catalysts from the reaction medium. Moreover, effective catalysts may be recycled with the use of adsorbents. These facts inspired us to investigate the use of adsorbents for the recovery and reuse of a metal complex that could activate persulphate to effectively degrade an organic pollutant in water. Herein, we report the nickel complex (C1) activated persulphate based degradation of methyl orange (MO) in water and the removal of C1 using activated carbon (AC) and Amberlite (Am) as adsorbents. C1 adsorbed onto AC (C1–AC) was reused in the solid form to activate persulphate and degrade MO without leaching C1 into water. Additionally, solid C1–Am recovered from the degraded MO solution was ion exchanged using sodium chloride to obtain C1, which was reused for MO degradation. The study demonstrates the application of adsorbents such as AC and Am for the adsorptive recovery and reuse of a metal complex based persulphate activator.