Ribeiro Lara Kelly, Gouveia Amanda Fernandes, Silva Francisco das Chagas M, Noleto Luís F G, Assis Marcelo, Batista André M, Cavalcante Laécio S, Guillamón Eva, Rosa Ieda L V, Longo Elson, Andrés Juan, Luz Júnior Geraldo E
Postgraduate Program in Chemistry, Department of Chemistry, Federal University of Piaui, 64049-550, Brazil.
LIEC/CDMF, Department of Chemistry, Federal University of São Carlos, P.O. Box 676, 13565-905, Brazil.
Nanomaterials (Basel). 2022 Sep 23;12(19):3316. doi: 10.3390/nano12193316.
Size and morphology control during the synthesis of materials requires a molecular-level understanding of how the addition of surface ligands regulates nucleation and growth. In this work, this control is achieved by using three carboxylic acids (tartaric, benzoic, and citric) during sonochemical syntheses. The presence of carboxylic acids affects the kinetics of the nucleation process, alters the growth rate, and governs the size and morphology. Samples synthesized with citric acid revealed excellent photocatalytic activity for the degradation process of Rhodamine B, and recyclability experiments demonstrate that it retains 91% of its photocatalytic activity after four recycles. Scavenger experiments indicate that both the hydroxyl radical and the hole are key species for the success of the transformation. A reaction pathway is proposed that involves a series of dissolution-hydration-dehydration and precipitation processes, mediated by the complexation of Ag. We believe these studies contribute to a fundamental understanding of the crystallization process and provide guidance as to how carboxylic acids can influence the synthesis of materials with controlled size and morphology, which is promising for multiple other scientific fields, such as sensor and catalysis fields.
材料合成过程中的尺寸和形态控制需要从分子层面理解表面配体的添加如何调节成核和生长。在这项工作中，通过在声化学合成过程中使用三种羧酸（酒石酸、苯甲酸和柠檬酸）来实现这种控制。羧酸的存在会影响成核过程的动力学，改变生长速率，并决定尺寸和形态。用柠檬酸合成的样品对罗丹明B的降解过程表现出优异的光催化活性，循环利用实验表明，经过四次循环后，它仍保留91%的光催化活性。清除剂实验表明，羟基自由基和空穴都是转化成功的关键物种。提出了一种反应途径，该途径涉及由Ag的络合介导的一系列溶解 - 水合 - 脱水和沉淀过程。我们相信这些研究有助于对结晶过程有基本的了解，并为羧酸如何影响具有可控尺寸和形态的材料合成提供指导，这对多个其他科学领域（如传感器和催化领域）具有前景。
