Amorphous Iron Phosphate: Inorganic Sol-Gel Synthesis-Sodium and Potassium Insertion

Fatima-Ezzahra Maarouf (Mohammed V University in Rabat)
Sanaa Saoiabi (Mohammed V University in Rabat)
Khalil Azzaoui (First Mohammed University)
Hind Khalil (Mohammed V University in Rabat)
Mariam Khalil (Mohammed V University in Rabat)
Ahmed El Yahyaoui (Mohammed V University in Rabat)
Ahmed Saoiabi (Mohammed V University in Rabat)
Belkheir Hammouti (First Mohammed University)
Moulay Hfid Youssoufi (First Mohammed University)
Sergey Shityakov (Würzburg University)
Othman Hamed (An-Najah National University)
Shehdeh Jodeh (An-Najah National University)
Rachid Sabbahi (University of Ibn Zohr)

Indonesian Journal of Science and Technology
Vol 7, No 2 (2022): IJOST: VOLUME 7, ISSUE 2, September 2022

Amorphous iron phosphate, FePO4.2H2O, was synthesized at ambient temperature using an inorganic sol-gel method coupled with a microwave route. The experimental conditions for the gelling of the Fe (III)-H3PO4 system are defined.  Potentiometric Time Titration (PTT) and Potentiometric Mass Titration (PMT) methods were used to investigate the acid-base surface chemistry of obtained phosphate. Variations of surface charge with the contact time, Q = f(t), are examined for time contact ranged from 0 to 72 hours. The concentrations suspensions used for this purpose were 0.75, 1.25, and 2.5 g/L. The point of zero charges (PZC) and isoelectric point (IEP) were defined using the derivative method examining the variations , at lower contact time. A value of 5.4 was obtained for both PZC and IEP. Q in the function of the t method is performed for synthesized FePO4. 2H2O in NaCl and KCl electrolytes. The optimal surface charge of 40 C corresponding to insertion of 4.2x10-4 M of Na+ or K+, is achieved in explored conditions. The results suggest that the synthesized iron phosphate is amorphous.