晶面可控BiOCl光催化剂的制备及其催化反应活性研究

以五水合硝酸铋和氯化钾为原料,通过水热法合成了BiOCl光催化剂,并对其结构进行表征,考察了前驱体的pH对催化剂结构和降解8-羟基喹啉活性的影响。结果表明,随前驱体pH的增加,催化剂001]晶面暴露程度下降,带隙能减小,且催化反应活性降低,这可归因于低的带隙能和高的光生载流子复合效率。进一步考察降解体系pH对催化剂反应活性的影响,结果表明,降解体系pH影响8-羟基喹啉在催化剂表面的吸附行为,进而影响催化剂的反应活性。

Preparation of Planar Controllable BiOCl Photocatalyst and Its Catalytic Activity

Using bismuth nitrate pentahydrate and potassium chloride as raw materials, BiOCl was synthesized successfully via hydrothermal method. The characterization of BiOCl was performed by using XRD, SEM, and DRS, and the influence of precursor pH value on the structure of BiOCl and the degradation of 8-hydroxyquinoline was investigated. The results show that with the increase of the pH value of the precursor, the exposure of {001} crystal plane, the band gap energy, and the catalytic activity decrease. The decrease of catalytic activity can be attributed to low band-gap energy and high photo-generated carrier recombination efficiency. Further investigate the effect of the pH value of the degradation system on the reactivity of BiOCl. The results show that the change of pH value changes the adsorption behavior of 8-hydroxyquinoline on BiOCl surface and then affects the reactivity of the catalyst.