Jilin University, State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Qianjin Street 2699, Changchun, 130012, P. R. China.
Fuzhou University, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, No. 2 Xue Yuan Road, University Town, Fuzhou, 350108, P. R. China.
Adv Mater. 2023 May;35(18):e2300396. doi: 10.1002/adma.202300396. Epub 2023 Mar 23.
The photoresponse and photocatalytic efficiency of bismuth oxychloride (BiOCl) are greatly limited by rapid recombination of photogenerated carriers. The construction of porous single-crystal BiOCl photocatalyst can effectively alleviate this issue and provide accessible active sites. Herein, a facile chelated ion-exchange strategy is developed to synthesize BiOCl mesoporous single-crystalline nanosheets (BiOCl MSCN) using acetic acid and ammonia solution respectively as chelating agent and ionization promoter. The strong chelation between acetate ions and Bi ions introduces acetate ions into the precipitated product to exchange with Cl ions, resulting in large lattice mismatch, strain release, and formation of void-like mesopores. The prepared BiOCl MSCN photocatalyst exhibits excellent catalytic performance with 99% conversion and 98% selectivity for oxidation of benzyl alcohol to benzaldehyde and superior general adaptability for various aromatic alcohols. The theoretical calculations and characterizations confirm that the superior performance is mainly attributed to the abundant oxygen vacancies, plenty of accessible adsorption/active sites and fast charge transport path without grain boundaries.
氧氯化铋（BiOCl）的光响应和光催化效率受到光生载流子快速复合的极大限制。多孔单晶 BiOCl 光催化剂的构建可以有效缓解这一问题，并提供可及的活性位点。在此，开发了一种简便的螯合离子交换策略，使用乙酸和氨水溶液分别作为螯合剂和离子化促进剂，合成 BiOCl 介孔单晶纳米片（BiOCl MSCN）。乙酸根离子与 Bi 离子之间的强螯合作用将乙酸根离子引入到沉淀产物中，与 Cl 离子进行交换，导致晶格错配度大、应变释放和形成类孔状介孔。所制备的 BiOCl MSCN 光催化剂表现出优异的催化性能，对苯甲醇氧化为苯甲醛的转化率达到 99%，选择性达到 98%，并且对各种芳香醇具有优异的普遍适应性。理论计算和表征证实，优异的性能主要归因于丰富的氧空位、大量可及的吸附/活性位点和快速的电荷输运路径，没有晶界。
