Controllable synthesis of (NH4)Fe2(PO4)2(OH)·2H2O using two-step route: Ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment

Dong, Bin; Li, Guang; Yang, Xiaogang; Chen, Luming; Chen, George Z.

Abstract

© 2017 Elsevier B.V. (NH4)Fe2(PO4)2(OH)·2H2O samples with different morphology are successfully synthesized via two-step synthesis route – ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment (UIHT) method. The effects of the adoption of ultrasonic-intensified impinging stream pre-treatment, reagent concentration (C), pH value of solution and hydrothermal reaction time (T) on the physical and chemical properties of the synthesised (NH4)Fe2(PO4)2(OH)·2H2O composites and FePO4 particles were systematically investigated. Nano-seeds were firstly synthesized using the ultrasonic-intensified T-mixer and these nano-seeds were then transferred into a hydrothermal reactor, heated at 170 °C for 4 h. The obtained samples were characterized by utilising XRD, BET, TG-DTA, SEM, TEM, Mastersizer 3000 and FTIR, respectively. The experimental results have indicated that the particle size and morphology of the obtained samples are remarkably affected by the use of ultrasonic-intensified impinging stream pre-treatment, hydrothermal reaction time, reagent concentration, and pH value of solution. When such (NH4)Fe2(PO4)2(OH)·2H2O precursor samples were transformed to FePO4 products after sintering at 650 °C for 10 h, the SEM images have clearly shown that both the precursor and the final product still retain their monodispersed spherical microstructures with similar particle size of about 3 μm when the samples are synthesised at the optimised condition.

Citation

Dong, B., Li, G., Yang, X., Chen, L., & Chen, G. Z. (2018). Controllable synthesis of (NH4)Fe2(PO4)2(OH)·2H2O using two-step route: Ultrasonic-intensified impinging stream pre-treatment followed by hydrothermal treatment. Ultrasonics Sonochemistry, 42, 452-463. https://doi.org/10.1016/j.ultsonch.2017.12.008

• Journal Article Type: Article
• Acceptance Date: Dec 4, 2017
• Online Publication Date: Dec 7, 2017
• Publication Date: 2018-04
• Deposit Date: May 27, 2020
• Journal: Ultrasonics Sonochemistry
• Print ISSN: 1350-4177
• Electronic ISSN: 1873-2828
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 42
• Pages: 452-463
• DOI: https://doi.org/10.1016/j.ultsonch.2017.12.008
• Public URL: https://nottingham-repository.worktribe.com/output/3213206
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S1350417717305758