Preparation and Electrocatalytic Performance of Bi-Modified Quartz Column Particle Electrode for Phenol Degradation

Jianbin Huang ,Gang Liu,Haitao Chen,Lili Dong,Shuo Pang,Huanyu Cui,Xingjuan Liu

doi:10.1155/2015/812752

Jianbin Huang , Gang Liu + Show 5 more

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https://doi.org/10.1155/2015/812752

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Abstract

Bismuth oxide (Bi2O3) and its composites have good electrocatalytic performance. Quartz column is a good kind of catalyst carrier with the characteristics of high mechanical strength and good stability. A novel Bi-modified quartz column particle electrode (BQP) was prepared by the dipping-calcination method. The characterization results revealed that Bi2O3was successfully loaded on quartz column. The optimum preparation condition was calcining at 550°C for 4 h. Electrocatalytic performance was evaluated by the degradation of phenol and the results indicated that the triclinic phase of Bi2O3showed the best electrocatalytic property. Besides, when the dosage concentration of the particle electrode was 125 g/L and the electrolytic voltage was 12 V, the degradation rate of phenol (200 mg/L) reached the highest (94.25%), compared with 70.00% of that in two-dimensional (2D) system. In addition, the removal rate of chemical oxygen demand (COD) was 75.50%, compared with 53.30% of that in 2D system. The reusability and regeneration of BQP were investigated and the results were good. Mechanism of enhanced electrochemical oxidation by BQP was evaluated by the capture of hydroxyl radical.

Highlights

In comparison to 2D electrochemical process, the introduction of particle electrode brings about higher specific surface area and shorter distance of mass transfer, which renders it more effective and promising for environmental applications [1]
The results revealed that the triclinic Bi2O3 was advantageous to the electrocatalytic property of the material
The optimum preparation condition was calcining at 550∘C for 4 h, on which the optimum degradation rate of phenol was 94.25% and the optimum removal rate of chemical oxygen demand (COD) was 75.50%

Summary

Introduction

In comparison to 2D electrochemical process, the introduction of particle electrode brings about higher specific surface area and shorter distance of mass transfer, which renders it more effective and promising for environmental applications [1]. Catalyst loaded on particle electrode provides one alternative method to extend specific surface area and promote mass transfer [7]. Some rare metal oxides like Sb2O3 and SnO2 or their composites regarded as effective catalysts have been widely studied in electrochemical technology and shown good performance [8]. Some studies have reported that Bi2O3 and its composites have good electrocatalytic performance [16, 17]. No reports have been found to use Bi2O3 as catalyst loading on particle electrode for the treatment of wastewater by electrocatalytic performance in 3D system

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