Comparative Studies On Degradation Of Bisphenol A Under Microwave Irradiation Catalyzed By Prepared Activated Carbon From Several Fruit Shell

In recent years, activated carbon-microwave （AC/MW） system as an improvedmethod,which has been widely used in environmental pollution control.Activatedcarbons has extensive surface area, high degree of surface reactivity, and favorablepore size distribution. MW irradiation combined with AC can result in thedegradation of organic pollutants, a process referred to as MW-assisted oxidation.AC particles can strongly absorb MW energy and then generate many “hot spots” onAC surface due to its non-uniformity. The organic pollutants could be adsorbed anddegraded on the surface of AC with “hot spots”.Activated carbons （AC） were prepared from several shells by chemicalactivation for degradation Bisphenol A （BPA） under microwave （MW） irradiation.Meanwhile，the microwave irradiation time, catalyst dosage, microwave power, theinitial concentration were studied in detail, and comparison the catalytic activity ofseveral AC in MW Catalytic process.Activated carbons （AC） were prepared from shell by chemical activationZnCl₂、H₃PO₄and KOH for degradation Bisphenol A （BPA） under microwave（MW） irradiation. Influence of activating agent concentration, chemicalactivation/coconut shell ratio （impregnation ratio）, activation temperature andactivation time on the yield and textural properties of the resulting AC werecompared. The AC is also conducted to improve degradation performance of BPA.The results showed that the degradation ratio of ZnCl₂-AC, H₃PO₄-AC, andKOH-AC could reach87.1%,56.8%, and40.4%for25mL total volume with50mg/L BPA solution and2g/L AC, under2min microwave irradiation, respectively.That showed again for BPA in aqueous solution can be degraded rapidly andeffectively under microwave irradiation in the presence of ZnCl₂-AC as catalyst.Shell activated carbons （AC） were prepared from coconut shell, nutshell andapricot shell by ZnCl₂for degradation Bisphenol A （BPA） under microwave （MW）irradiation. Influence factors of activating agent concentration, chemical activation/coconut shell ratio （impregnation ratio）, activation temperature andactivation time on the yield and textural properties of the resulting AC were studied.The results showed that the degradation ratio of coconut-AC, nutshell-AC, andapricot-AC could reach80%,50%, and88%for25mL total volume with50mg/LBPA solution and2.0g/L AC, under2.0min microwave irradiation, respectively.That showed again for BPA in aqueous solution can be degraded rapidly andeffectively under microwave irradiation in the presence of nutshell AC as catalyst.Tthe anatase and rutile TiO₂supported activate carbon （A-TiO₂/AC andR-TiO₂/AC） were irradiated by microwave （MW）, and compared the numerber ofgenerated hydroxyl radicals （·OH）. In TiO₂/AC/MW systerm,the more·OH weregenerated than that in AC/MW systerm. Meanwhile, the cataylst dose,MW powerand MW irradiation time were studied.At last, the researches on the MW irradationdegradation of several organic dyes （Acid Red B, Methyl Orange Acid Orange Ⅱ,Methylene blue,Azo Fuchsine）were also performed. It is wished that this papermight offer some important subjects for the destruction of organic contaminants inwastewater treatment applications.Activated carbons （AC） with high surface area were prepared from nutshell bychemical activation.The method using activated carbon as catalyst under microwaveirradiation revealed many advantages such as high degradation ratio, rapiddegradation, low cost, no intermediates and no secondary pollution.