Synergetic Effect of Ultrasound, the Heterogeneous Fenton Reaction and Photocatalysis by TiO₂ Loaded on Nickel Foam on the Degradation of Pollutants.

Shan Qiu,Guangming Li,Jixian Yang,Shanwen Xu

doi:10.3390/ma9060457

Abstract

The synergistic effect of ultrasound, the heterogeneous Fenton reaction and photocatalysis was studied using a nickel foam (NF)-supporting TiO2 system and rhodamine B (RhB) as a target. The NF-supporting TiO2 system was prepared by depositing TiO2 on the skeleton of NF repeatedly and then calcining it. To optimize the conditions and parameters, the catalytic activity was tested in four systems (ultrasound alone (US), nickel foam (NF), US/NF and NF/US/H2O2). The optimal conditions were fixed at 0.1 g/mL NF, initial 5.00 mg/L RhB, 300 W ultrasonic power, pH = 3 and 5.00 mg/L H2O2. The effects of the dissolution of nickel from NF and quenching of the Fenton reaction were studied on degradation efficiency. When the heterogeneous Fenton reaction is combined with TiO2-photocatalysis, the pollutant removal efficiency is enhanced significantly. Through this synergistic effect, 22% and 80% acetochlor was degraded within 10 min and 80 min, respectively.

Highlights

As one of advanced oxidation processes (AOP), the Fenton reaction can efficiently degrade various pollutants [1,2,3]
Four AOP systems were compared to each other: US alone, nickel foam (NF) alone, US/NF, NF and US/NF/H2 O2 for the removal efficiency of rhodamine B (RhB)
The NF-supporting TiO2 system system was prepared by depositing TiO2 on the skeleton of NF repeatedly and calcining it

Summary

Introduction

As one of advanced oxidation processes (AOP), the Fenton reaction can efficiently degrade various pollutants [1,2,3]. Free radicals are produced in the Fenton reaction, which can damage and degrade organic molecules. Hydroxyl radicals (OH‚) are the main product of the Fenton reaction with high reactivity. They convert organic molecules into CO2 , H2 O and other inorganic ions [4,5]. The Fenton reaction is a kind of AOP that potentially can be used in environmental pollutant treatment areas [6,7,8]

Methods

Results

Conclusion