Preparation of (5.0%)Er3+:Y3Al5O12/Pt-(TiO2-Ta2O5) nanocatalysts and application in sonocatalytic decomposition of ametryn in aqueous solution

Abstract

(5.0%)Er:YAlO/Pt-(TiO-TaO) powder, as a high effective sonocatalyst, was prepared using sol-gel and calcination method. Then it was characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the sonocatalytic activity of the prepared (5.0%)Er:YAlO/Pt-(TiO-TaO) powder, the sonocatalytic decomposition of ametryn was studied. In addition, some influencing factors such as different Ti/Ta molar ratios on the sonocatalytic activity of the prepared (5.0%)Er:YAlO/Pt-(TiO-TaO) powder, catalyst added amount with ultrasonic irradiation time and used times on the sonocatalytic decomposition efficiency were examined by using ion chromatogram determination. The experimental results showed that the best sonocatalytic decomposition ratio of ametryn were 77.50% based on the N atom calculation and 95.00% based on the S atom calculation, respectively, when the conditions of 10.00mg/L initial concentration, 1.00g/L prepared (5.0%)Er:YAlO/Pt-(TiO-TaO) powder (Ti/Ta=1.00:0.25 heat-treated at 550°C for 3.0h) added amount, 150min ultrasonic irradiation (40kHz frequency and 300W output power), 100mL total volume and 25-28°C temperature were adopted. Therefore, the (5.0%)Er:YAlO/Pt-(TiO-TaO) composite nanoparticles could be considered as an effective sonocatalyst for decomposition of ametryn in aqueous solution.

Construction of Z‐scheme Pt‐TiO2/(Er3+:Y3Al5O12@Ta2O5)/HAP and its application in sonocatalytic degradation of prometryn and disinfection of Escherichia coli

“…As shown in Fig. (a), some typical XRD diffraction peaks at 2θ = 18.15° (211), 33.50° (400), 41.50° (422), 46.62° (521) and 55.12° (532) are found, which are the same as previously reported, belonging to the characteristic diffraction peaks of Er 3+ :Y 3 Al 5 O 12 . According to the characteristic diffraction peaks of 28.32° and 36.75° in Fig.…”

“…First, Er 3+ :Y 3 Al 5 O 12 was prepared by the sol–gel and calcination method (for more details refer to a previous report). P‐TET as sonocatalyst was prepared in the following steps.…”

Evaluation of the main active species involved in the TiO2 photocatalytic degradation of ametryn herbicide and its by-products

“…In this context, it is utmost importance to identify the main active species and determine their roles in the formation of intermediates in order to develop and understand the mechanisms underlying the reactivity of photocatalysts for environmental remediation [39]. Although some studies of ametryn degradation by photocatalysis have been reported [40][41][42][43][44][45], none of them investigated the role of reactive species involved in the degradation process and their role in the degradation pathways. This work focused on the elucidation of the photocatalytic mechanism for the removal of ametryn by TiO2 catalysts under simulated solar light.…”