Hydrothermal Synthesis of PbO2/RGO Nanocomposite for Electrocatalytic Degradation of Cationic Red X-GRL

Weidong Li,Qi Liu,Huayun Yang

doi:10.1155/2017/1798706

Weidong Li, Qi Liu + Show 1 more

Open Access

https://doi.org/10.1155/2017/1798706

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Abstract

PbO2 nanoparticles were prepared using a simple hydrothermal method with β-PbO as precursor and ammonium peroxydisulfate as oxidant. During the hydrothermal condition with ammonium peroxydisulfate, the formed hydroxyl radical has played a key role in the oxidation of β-PbO to PbO2. The size of as-prepared PbO2 nanoparticles was in the range of 25–50 nm. Reduced graphene oxide (RGO) was successfully prepared by the simple reduction reaction of graphene oxide by sodium borohydride and the obtained RGO was then incorporated into the PbO2 nanoparticles. The surface of ITO electrode was modified with the as-prepared PbO2/RGO nanocomposite. The constructed PbO2/RGO/ITO electrode was subsequently applied for the catalytic degradation of cationic red X-GRL which was an azo dye in wastewater. The effects of reaction time, applied current density, and initial concentration of dye on the color removal and COD removal were thoroughly investigated. All results demonstrated that the degradation performance of the electrode modified with PbO2/RGO nanocomposite was extremely excellent.

Highlights

A large amount of wastewater has been produced in the textile industry since the consumption of chemical dyes and water in the dye bleeding processes in high demand
Several techniques including wet air oxidation (WAO) [3,4,5], catalytic wet air oxidation (CWAO) [6] and electrochemical oxidation [7] have been employed for the treatment of the wastewater
For the degradation of azo dye using electrochemical oxidation, the performances of various anodes including active carbon fiber (ACF) [14], Pt [15], PbO2 [16], SnO2 [17], RuO2 [18], and diamond electrode [19, 20] were investigated in detail

Summary

Introduction

A large amount of wastewater has been produced in the textile industry since the consumption of chemical dyes and water in the dye bleeding processes in high demand. Cathonic red X-GRL, a kind of azo dye, is widely applied in various industries including varnish, plastic, and textile. For the degradation of azo dye using electrochemical oxidation, the performances of various anodes including active carbon fiber (ACF) [14], Pt [15], PbO2 [16], SnO2 [17], RuO2 [18], and diamond electrode [19, 20] were investigated in detail. For the sake of retaining the high specific surface area, varieties of conductive materials, including conductive carbon materials and polymers and metal oxides, can be adopted as a substrate for the electrode composed of nanomaterial. Cationic red X-GRL, a hardly biodegradable dye that was widely used in various industries such as plastic, textile, and varnish, has been employed as a model organic substance in wastewater

Experimental

Results and Discussion

1: XRD pattern of synthesized

Conclusions