Batch and bulk adsorptive removal of anionic dye using metal/halide-free ordered mesoporous carbon as adsorbent

The present report is an outcome of investigations to assess the adsorptive potential a synthesized metal- and halide-free variant ordered mesoporous carbon (OMC) towards anionic azo dye, Methyl Orange. results preliminary studies, carried out in batch mode, helped setting up process variables achieve optimum adsorption conditions. experimental data were then fitted Langmuir, Freundlich, Temkin, Dubinin-Radushkevitch isotherm models. equilibrium well Langmuir model at 303 K monolayer capacity was 0.33 mmol g?1. kinetics explored by fitting pseudo-first-order pseudo-second-order kinetic latter described well, as indicated higher regression coefficients. To elucidate mechanism mass transfer, various well-known mathematical models employed. dye found involve particle diffusion. Thermodynamic studies revealed that uptake Orange OMC spontaneous (?G0 = ?23.71 kJ mol?1) exergonic (?H0 ?123.15 mol?1). Finally, bulk removal investigated through column operations followed regeneration (desorption) studies. Column saturation 96.55% could be realized. Values for recovery reached 93.26%. efficiency evaluated carrying three consecutive adsorption/desorption cycles. obtained adsorbent has good ability eliminate from wastewater, both operations.