过硫酸盐增强ZnO@N,C-Co_(3)O_(4)光电催化降解四溴双酚A的性能研究

The Photoelectrocatalytic Degradation of Tetrabromobisphenol A with Persulfate-enhanced ZnO@N,C-Co_(3)O_(4)

过硫酸盐活化技术作为一种新型高级氧化技术,与光电催化技术耦合后能够显著提高材料对污染物的降解性能.通过水热法研制ZIF-67/8的衍生材料ZnO@N,C-Co_(3)O_(4),显著拓宽ZnO的光吸收范围至可见光区域,并且有效抑制光生载流子的复合.对复合薄膜电极的化学组成、形貌特征、光吸收性能进行表征,研究了光电化学性能.研究表明:薄膜电极在过硫酸盐增强光电催化体系中对四溴双酚A(TBBPA)的降解率最高达97.2%.过硫酸盐活化技术和光电催化耦合显著增强ZnO@N,C-Co_(3)O_(4)对TBBPA的催化降解效率.提出了过硫酸盐增强光电催化降解TBBPA的机理,硫酸根自由基和羟基自由基是该体系的主要活性物种.

The persulfate activation technology,as one of the advanced oxidation technologies,can significantly improve the performance of materials degradating pollutants when coupled with photocatalysis.ZnO@N,C-Co_(3)O_(4) was fabricated from ZIF-67/8 through hydrothermal method.The optical absorption range of ZnO was expanded to the visible light region and the recombination of photogenerated carriers was effectively inhibited.The chemical composition,morphology and light absorption properties of the composite film electrode were characterized,and the photoelectrochemical properties were degradation studied.The highest rate of degrading Tetrabromobisphenol A(TBBPA)from the thin film electrode in the persulfate-enhanced photocatalytic system was 97.2%,which indicated that the coupling of the persulfate activation technology and photocatalysis significantly enhanced the efficiency of catalytic degradation of TBBPA from ZnO@N,C-Co_(3)O_(4).The mechanism of photoelectrocatalytic degradation of TBBPA assisted with persulfate was studied.Sulphate radical and hydroxyl radical were the main active species in the system.