Matos Robert S, Attah-Baah John M, Monteiro Michael D S, Costa Benilde F O, Mâcedo Marcelo A, Da Paz Simone P A, Angélica Rômulo S, de Souza Tiago M, Ţălu Ştefan, Oliveira Rosane M P B, Ferreira Nilson S
Postgraduate Program in Materials Science and Engineering (P2CEM), Federal University of Sergipe, São Cristovão 49100-000, SE, Brazil.
Amazonian Materials Group, Federal University of Amapá (UNIFAP), Macapá 68911-477, AP, Brazil.
Nanomaterials (Basel). 2022 Aug 22;12(16):2889. doi: 10.3390/nano12162889.
ZnO nanocrystals with three different morphologies have been synthesized via a simple sol-gel-based method using (bitter Amapá) and (sweet Amapá) latex as chelating agents. X-ray diffraction (XRD) and electron diffraction patterns (SAED) patterns showed the ZnO nanocrystals were a pure hexagonal wurtzite phase of ZnO. XRD-based spherical harmonics predictions and HRTEM images depicted that the nanocrystallites constitute pitanga-like (15.8 nm), teetotum-like (16.8 nm), and cambuci-like (~22.2 nm) shapes for the samples synthesized using bitter Amapá, sweet Amapá, and bitter/sweet Amapá chelating agent, respectively. The band gap luminescence was observed at ~2.67-2.79 eV along with several structural defect-related, blue emissions at 468-474 nm (V, V, Zn), green emissions positioned at 513.89-515.89 (h-VO+), and orange emission at 600.78 nm (VO+-VO++). The best MB dye removal efficiency (85%) was mainly ascribed to the unique shape and oxygen vacancy defects found in the teetotum-like ZnO nanocrystals. Thus, the bitter Amapá and sweet Amapá latex are effective chelating agents for synthesizing distinctive-shaped ZnO nanocrystals with highly defective and remarkable photocatalytic activity.
通过一种简单的基于溶胶 - 凝胶的方法，以（苦阿马帕）和（甜阿马帕）乳胶作为螯合剂，合成了具有三种不同形态的氧化锌纳米晶体。X射线衍射（XRD）和电子衍射图案（SAED）表明，氧化锌纳米晶体为纯六方纤锌矿相的氧化锌。基于XRD的球谐函数预测和高分辨率透射电子显微镜（HRTEM）图像显示，对于分别使用苦阿马帕、甜阿马帕和苦/甜阿马帕螯合剂合成的样品，纳米微晶分别呈现出类似番樱桃的形状（约15.8纳米）、类似陀螺的形状（约16.8纳米）和类似巴西红果的形状（约22.2纳米）。观察到带隙发光在约2.67 - 2.79电子伏特，同时还有几个与结构缺陷相关的蓝光发射峰位于468 - 474纳米（V、V、Zn）、绿光发射峰位于513.89 - 515.89纳米（h - VO +）以及橙光发射峰位于600.78纳米（VO + - VO ++）。最佳的亚甲基蓝（MB）染料去除效率（85%）主要归因于类似陀螺形状的氧化锌纳米晶体中独特的形状和氧空位缺陷。因此，苦阿马帕和甜阿马帕乳胶是用于合成具有高度缺陷和显著光催化活性的独特形状氧化锌纳米晶体的有效螯合剂。
