晶面可控BiOCl光催化剂的制备及其催化反应活性研究
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摘要
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。
Using bismuth nitrate pentahydrate and potassium chloride as raw materials,BiOCl was synthesized successfully via hydrothermal method,and its structure was characterized by XRD,SEM,and DRS. The influence of precursor pH value on the structure of BiOCl and the degradation of 8-hydroxyquinoline was investigated. The results showed that the exposure of [001] crystal plane,the band gap energy,and the catalytic activity decrease with the increase of precursor pH, which can be attributed to low band-gap energy and high photo-generated carrier recombination efficiency. The effect of degradation system pH on the reactivity of BiOCl catalyst was further investigated. The results showed that degradation system pH affected the adsorption behavior of 8-hydroxyquinoline on the surface of the catalyst,which in turn affected the reactivity of the catalyst.
Using bismuth nitrate pentahydrate and potassium chloride as raw materials,BiOCl was synthesized successfully via hydrothermal method,and its structure was characterized by XRD,SEM,and DRS. The influence of precursor pH value on the structure of BiOCl and the degradation of 8-hydroxyquinoline was investigated. The results showed that the exposure of [001] crystal plane,the band gap energy,and the catalytic activity decrease with the increase of precursor pH, which can be attributed to low band-gap energy and high photo-generated carrier recombination efficiency. The effect of degradation system pH on the reactivity of BiOCl catalyst was further investigated. The results showed that degradation system pH affected the adsorption behavior of 8-hydroxyquinoline on the surface of the catalyst,which in turn affected the reactivity of the catalyst.
引文
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