Enhanced heterogeneous wet hydrogen peroxide catalytic oxidation performance of fly ash-derived zeolite by CuO incorporation

Abstract

Abstract. Copper oxide incorporated y ash-derived zeolite X (CuO/FAZ-X) was synthesized from solid waste coal y ash by ion exchange with Cu 2+ followed by calcination process. The synthesized materials were characterized by XRF, FTIR, SEM, EDX, and BET methods. In the application of the catalysts for wet peroxide oxidative decolorization of the model dye MB (Methylene Blue), the e ects of major parameters, such as CuO loading, initial H 2 O 2 concentration, initial dye concentration, catalyst dosage, and pH, were investigated to assess the activity of the catalysts. In comparison with the activity of either y ash-derived zeolite X (FAZ-X) or CuO, the combined catalyst (CuO/FAZ-X) showed an enhanced wet catalytic activity. Under the optimal condition (catalyst dose 250 mg/L, 100 ppm dye, pH = 6.8, 1 ml H2O2, and room temperature or 30 C), the decolorization of MB was about 100% in 120 min by CuO/FAZ-X and only 31% and 44% by FAZ-X and CuO, respectively. Based on the decolorized products identi ed by HPLC-(-ESI)-TOF-MS, the decolorization pathway of MB was proposed. Consequently, incorporation of CuO remarkably improved the catalytic activity of FAZ-X, such that CuO/FAZ-X emerged as a novel, reusable heterogeneous Fenton-like catalyst for oxidative decolorization of model dye MB. Thus, the present work demonstrates a simple and facile route for the conversion of waste coal y ash into a valuable catalyst.

EPR Evidence for Mechanistic Diversity of Cu(II)/Peroxygen Oxidation Systems by Tracing the Origin of DMPO Spin Adducts

“…In previous reports, − the main reactive oxygen species in Cu-catalyzed H 2 O 2 process was identified to be • OH, which combined with DMPO to develop DMPO-OH adducts as identified by EPR experiments. However, Lee et al did not detect any DMPO-OH signal in a homogeneous Cu­(II)/H 2 O 2 solution under either acidic or neutral pH conditions.…”

An analysis on the effect of temperature on the morphology of egg shell CaO catalyst: Caytalyst production for biodiesel preparation

“…Another study emphasized that addition of CuO in FAZ-X (fly ash derived zeolite-X) have significantly improved the catalytic activity and reusability of the waste derived catalyst. Similarly, other researchers have also suggested the usage of environmentally friendly and high reusability catalyst for carrying out reactions [30][31][32][33][34]. This is very much necessary as biodiesel have been reported to have better characteristics in emission during combustion from internal combustion engines [35][36][37][38][39].…”