Abstract Undoped and Zn-doped SnO2 nanocrystals were prepared using a straightforward polyol method and the influence of the doping on the structural, textural, and optical properties was carefully studied. X-ray diffraction (XRD) patterns revealed after annealing the formation of cassiterite, i.e. rutile-like, tetragonal SnO2 crystallites and the absence of any crystalline zinc phase whatever the doping concentration. However, the average crystallite size decreased from 9 to 6.5 nm when the doping concentration increased from 0 to 10 at%, respectively. Furthermore, Transmission Electron Microscopy (TEM) and N2 sorption porosimetry showed that all samples prepared were made of an aggregated network of almost spherical nanoparticles, the size of which decreased when increasing the doping concentration up to 10 at%. The presence of SnO2 and zinc oxide species was assessed by EDX (Energy Dispersive X-ray spectroscopy) analysis. According to UV–visible absorption measurements, this decrease in nanoparticle size was accompanied by a decrease in the band gap value from 3.50 eV for undoped SnO2 to 3.17 eV for 10 at% Zn-doped SnO2. The photocatalytic properties of undoped and Zn-doped SnO2 nanoparticles were evaluated by studying the photodecomposition of methylene blue (MB) and methyl orange (MO) as organic pollutant models. The 10 at% Zn-doped SnO2 nanoparticles showed the highest photocatalytic activity for both MB and MO decomposition and led to an almost complete discoloration of MB solutions, i.e. 98%, after irradiation of 120 min and to an apparent MB degradation constant rate reaching 0.058 min−1.

中文翻译：

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锌掺杂对多元醇法合成纳米SnO 2 颗粒光催化活性的影响，用于增强有机染料的降解

摘要 使用简单的多元醇方法制备了未掺杂和 Zn 掺杂的 SnO2 纳米晶体，并仔细研究了掺杂对结构、结构和光学性能的影响。X 射线衍射 (XRD) 图案在锡石的形成后显示，即金红石状的四方 SnO2 微晶，并且无论掺杂浓度如何，都不存在任何结晶锌相。然而，当掺​​杂浓度分别从 0 原子％增加到 10 原子％时，平均晶粒尺寸从 9 纳米减少到 6.5 纳米。此外，透射电子显微镜 (TEM) 和 N2 吸附孔隙率测定法表明，制备的所有样品均由几乎球形纳米颗粒的聚集网络制成，当掺杂浓度增加至 10 at% 时，纳米颗粒的尺寸减小。SnO 2 和氧化锌物质的存在通过EDX（能量色散X射线光谱）分析来评估。根据紫外-可见吸收测量，纳米颗粒尺寸的减小伴随着带隙值从未掺杂 SnO2 的 3.50 eV 降低到 10 at% Zn 掺杂 SnO2 的 3.17 eV。通过研究亚甲基蓝 (MB) 和甲基橙 (MO) 作为有机污染物模型的光分解，评估了未掺杂和掺杂锌的 SnO2 纳米粒子的光催化性能。10 at% Zn 掺杂的 SnO2 纳米粒子对 MB 和 MO 分解显示出最高的光催化活性，并导致 MB 溶液几乎完全变色，即 98%，在照射 120 分钟后，MB 降解恒定速率达到 0.058最小-1。