Ammonium phosphomolybdate: a material for dielectric crossover and resistive switching performance

Abstract

The yellow ammonium phosphomolybdate [(NH4)3PMo12O40] (YAPM) is a robust and elegant compound which finds innumerable field applications. Herein, we have shown that this inorganic polymer serves as a novel dielectric...

Selective and Fast Separation of Cesium Ions by In Situ Synthesized Ammonium Molybdophosphate-Like Moieties in a Polymer Gel

“…The polymer gels were further characterized by recording their Raman spectra as shown in Figure S1. Typical characteristic bands of Mo–O–Mo stretching (657 cm –1 ), Mo–O–Mo asymmetric stretching (820 cm –1 ), and Mo–O stretching vibrations (988 cm –1 ) showing the presence of Keggin structure are observed in AMP powder as well as AMP-modified polymer gels …”

“…Typical characteristic bands of Mo−O−Mo stretching (657 cm −1 ), Mo−O−Mo asymmetric stretching (820 cm −1 ), and Mo−O stretching vibrations (988 cm −1 ) showing the presence of Keggin structure are observed in AMP powder as well as AMPmodified polymer gels. 45 Cesium Ion Uptake Studies. The uptake of Cs + ion in AMP-modified gels (poly(BMEP)-AMP and poly(BMEP-AA)-AMP) was studied at different acid concentrations, namely 0.5, 2, 4, and 8 mol L −1 HNO 3 .…”

Efficient lead sorption by ammonium phosphomolybdate: experimental and density functional theory (DFT) studies

“…The weak signals between 600-500 cm À1 are due to the other Mo-O bond vibrations in APM. 36 Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis were also performed to observe the morphology and elemental composition of the pristine adsorbent. As shown in Fig.…”

“…The decrease in the intensity of the (222) peak at 26.4741 indicates the development of significant lattice strain in Pb-APM, which caused the formation of defects or oxygen vacancies in the lattice. 36 The variation in the atomic displacement with Pb 2+ sorption resulted in the shifting of peaks towards lower angle, as highlighted in Fig. 8a (inset).…”

“…30 It shows high selectivity for Cs + , good recovery (495%) and a distribution coefficient (K d ) of about 104 mL g À1 of under low or neutral pH conditions; however, metal ions can easily be recovered from the APM-based sorbent by dissolving it in alkali solutions such as NH 4 OH or NH 4 Cl. [31][32][33] In the last few years, APM has also been extensively investigated for electrocatalysts, 34,35 dielectric materials, 36 the removal of cationic dyes from wastewater, 37,38 the catalytic desulfurization of diesel fuel, 39 photocatalysts 40 and even nanomaterial synthesis. 41,42 The ion exchange capacity of APM to form Cs 2 NH 4 PMoO 40 is approximately 1.0 mmol g À1 , and the ion exchange mechanism is an isomorphous exchange of ammonium ions with Cs ions, as reported in the literature.…”