Degradation of organics with simultaneous recovery of silver in a simple visible-light responsive dual photoelectrode photocatalytic fuel cell,Environmental Science: Water Research & Technology

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Degradation of organics with simultaneous recovery of silver in a simple visible-light responsive dual photoelectrode photocatalytic fuel cell
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-04-29 , DOI: 10.1039/d0ew00130a
Xu Zhao _{1,

2,

3,

4,

5} , Xia Li _{1,

2,

3,

4,

5} , Yan Wang _{1,

2,

3} , Jia Lin _{6,

7,

8} , Jie Liu _{6,

7,

8} , Huixin Shao _{1,

2,

3,

4,

5}

Affiliation

An efficient photocatalytic fuel cell (PFC) system driven by visible-light using a BiVO₄ photoanode and a Cu₂O/CuO photocathode has been designed for phenol degradation with simultaneous silver recovery. Using this system, 86.4% removal of phenol (5 mg L⁻¹) and 100% recovery of Ag (40 mg L⁻¹) were achieved within 4 h, which was more efficient than the individual PFC system without Ag⁺ ions. High Ag⁺ concentration and low initial pH were beneficial for phenol removal. The surface variations of the photoanode and photocathode were characterized by the FE-SEM, XRD and XPS techniques. The Ag species recovered on the photoanode was found to be metallic Ag and Ag₂O and the Ag species recovered on the photocathode was determined to be metallic Ag. The Ag₂O–BiVO₄ heterojunction inhibited the recombination of photo-generated electron–hole pairs. Active radicals including h⁺, ˙O₂⁻ and ˙OH were determined to be responsible for the degradation of organics by quenching experiments and ESR analysis. The proposed system provided an economical and efficient way for the oxidation of organic contaminants and metal ion recovery.

中文翻译：

简单可见光响应双光电极光催化燃料电池中有机物的降解和银的同时回收

使用BiVO ₄光电阳极和Cu ₂ O / CuO光电阴极设计了由可见光驱动的高效光催化燃料电池（PFC）系统，用于苯酚降解并同时回收银。使用该系统，可在4小时内除去86.4％的苯酚（5 mg L ^-1）和100％回收Ag（40 mg L ^-1），这比没有Ag ⁺离子的单个PFC系统更有效。高Ag ⁺浓度和低初始pH值对于去除苯酚是有益的。通过FE-SEM，XRD和XPS技术表征了光电阳极和光电阴极的表面变化。发现在光电阳极上回收的Ag种类为金属Ag和Ag ₂O和在光电阴极上回收的Ag种类确定为金属Ag。Ag ₂ O–BiVO ₄异质结抑制了光生电子-空穴对的重组。活性基团，包括ħ ⁺，邻₂^-和OH被确定为通过淬火实验和ESR分析负责有机物的降解。提出的系统为有机污染物的氧化和金属离子的回收提供了一种经济有效的方法。

更新日期：2020-07-02

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