Search

Pyrochar–AgBr (DCG–AgBr) produced from discarded chewing gum for the decontamination of trichlorophenol (2,4,5-TCP) is reported. The DCG–AgBr specific surface area (249.5 m2/g), the pore volume of 0.998 cm3/g, surface functional groups and thermal analysis were established. The 2,4,5-TCP removal efficiency at 10 mg/L was estimated to be ∼96% and the dynamic behavior was successfully described by the Thomas and Yoon–Nelson models. Based on the economic analysis, the total cost for treatment of 2,4,5-TCP simulated wastewater was 14.39 US$/m3. For the first time, commonly discarded chewing gum was employed as a precursor for fabrication of adsorbents for wastewater treatment. [ABSTRACT FROM AUTHOR]

High-performance activated carbon-zinc oxide (Ac–ZnO) nanocatalyst was fabricated via the microwave-assisted technique. Ac–ZnO was characterized and the results indicated that Ac–ZnO is stable, had a band gap of 3.26 eV and a surface area of 603.5 m2g−1, and exhibited excellent adsorptive and degrading potentials. About 93% phenol was adsorbed within 550 min of reaction by Ac–ZnO. Impressively, a complete degradation was achieved in 90 min via a photo-Fenton/Ac–ZnO system under optimum conditions. An artificial neural network (ANN) model was developed and applied to study the relative significance of input variables affecting the degradation of phenol in a photo-Fenton process. The ANN results indicate that increases in both H2O2 and Ac–ZnO dosage enhanced the rate of phenol degradation. The highest rate constant at the optimum conditions was 0.093 min−1 and it was found to be consistent with the ANN-predicted rate constant (0.095 min−1). [ABSTRACT FROM AUTHOR]