TY - JOUR
T1 - Supercritical hydrothermal synthesis of nano-ZnO
T2 - Effects of key parameters and reaction mechanism
AU - Liu, Lu
AU - Wang, Shuzhong
AU - Liu, Wei
AU - Wang, Jinlong
AU - Zhang, Baoquan
AU - Yang, Jianqiao
AU - Liu, Hui
AU - Li, Yanhui
N1 - Publisher Copyright:
© 2023 Elsevier Ltd and Techna Group S.r.l.
PY - 2023/10/1
Y1 - 2023/10/1
N2 - In this paper, ZnO particles with the particle size as low as 23 nm were successfully prepared by supercritical hydrothermal synthesis technique. The particle size of nano-ZnO decreased with the increase of temperature and pressure. Nano-ZnO particles in ZnSO4 system were spherical with smaller particle size. The discrepancy in nano-ZnO produced by different precursor of Zn(NO3)2, Zn(CH3COO)2 or ZnSO4 is attributed to the anion effects and supersaturation. The particles in the KOH system (29 nm) were smaller than those in the NaOH system (44 nm). For precursor concentration, intermediate Zn(OH)2 was generated at lower concentration, while Zn4SO4(OH)6·4H2O was produced at higher concentration. For alkali concentration, as the gradual increase of KOH concentration, Zn(OH)2 began to decrease and gradually transformed into Zn(OH)3– and [Zn(OH)4]2−. When the KOH concentration reached a certain value, [Zn(OH)4]2− occupied the dominance in the mixed solution.
AB - In this paper, ZnO particles with the particle size as low as 23 nm were successfully prepared by supercritical hydrothermal synthesis technique. The particle size of nano-ZnO decreased with the increase of temperature and pressure. Nano-ZnO particles in ZnSO4 system were spherical with smaller particle size. The discrepancy in nano-ZnO produced by different precursor of Zn(NO3)2, Zn(CH3COO)2 or ZnSO4 is attributed to the anion effects and supersaturation. The particles in the KOH system (29 nm) were smaller than those in the NaOH system (44 nm). For precursor concentration, intermediate Zn(OH)2 was generated at lower concentration, while Zn4SO4(OH)6·4H2O was produced at higher concentration. For alkali concentration, as the gradual increase of KOH concentration, Zn(OH)2 began to decrease and gradually transformed into Zn(OH)3– and [Zn(OH)4]2−. When the KOH concentration reached a certain value, [Zn(OH)4]2− occupied the dominance in the mixed solution.
KW - Key parameters
KW - Nano-ZnO
KW - Reaction mechanism
KW - Supercritical hydrothermal synthesis
UR - https://www.scopus.com/pages/publications/85165276256
U2 - 10.1016/j.ceramint.2023.07.079
DO - 10.1016/j.ceramint.2023.07.079
M3 - 文章
AN - SCOPUS:85165276256
SN - 0272-8842
VL - 49
SP - 31313
EP - 31324
JO - Ceramics International
JF - Ceramics International
IS - 19
ER -