Para‐substituted 1‐Phenyl‐3‐methyl‐4‐aroyl‐5‐pyrazolones as Selective Extractants for Vanadium(V) from Acidic Chloride Solutions

Abstract

Para-substituted 4-aroyl derivatives of 1-phenyl-3-methyl-5-pyrazolones (HX), namely, 1-phenyl-3-methyl-4-(4-fluorobenzoyl)-5-pyrazolone (HPMFBP) and 1-phenyl-3-methyl-4-(4-toluoyl)-5-pyrazolone (HPMTP) were synthesized and examined with regard to the extraction behavior of multivalent metal ions such as magnesium(II), aluminum(III), titanium(IV), vanadium(V), chromium(III), manganese(II), iron(II), and iron(III) that are present in titania waste chloride liquors. For comparison, studies have also been carried out with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP). The results demonstrate that vanadium(V) and iron(III) are extracted into chloroform with 4-aroyl-5-pyrazolones as VO 2 X . HX and FeX 3 , respectively. On the other hand, magnesium(II), aluminum(III), titanium(IV), chromium(III), manganese(II), and iron(II) were not found to be extracted into the organic phase. The equilibrium constants of vanadium(V) and iron(III) with various 4-aroyl-5-pyrazolones follow the order HPMFBP . HPMBP . HPMTP, which is in accordance with their pKa values. The selectivity between vanadium(V) and iron(III) increases with increasing hydrochloric acid concentration. Further, it is clear from the results that iron(III) is not getting extracted above 1.0 mol dm 23 hydrochloric acid solution. The electronic and IR spectra of the extracted complexes of vanadium(V) and iron(III) were used to further clarify the nature of the extracted complexes. The potential of these reagents for the selective extraction and separation of vanadium(V) from titania waste chloride liquors has also been discussed.

Synthesis and Characterization of HPMpFBP Using Raman Spectroscopy, Nuclear Magnetic Resonance (NMR) Spectroscopy, and FTIR

“…On the 1 H NMR spectrum, the pepper displacement is 7.20-8.00 ppm. While, the characterization results obtained by Meera et al (2004) and Remya et al (2006) are 1 H NMR (CDCL3) data : δ (ppm) 7.17-7.87, and IR (KBr) data (ʋ cm -1 ); 2800, 1620 (C=O), 1590, 1500, 1356, 1214, 752; Elemental analysis: calculated for C17H13N2O2F. In the spectrum 1 H NMR spectrum of HPMFBP, no peak corresponding to the enolic -OH has been observed.…”

“…The synthesis of HPMpFBP had been carried out by other researchers with the same and different compound names. Jensen et al (1959), andMustaffa &Illyas Md Isa (2011) named their synthesis result as HPMpFBP, while Meera et al (2004) and Remya et al(2006) named their synthesis result as HPMFBP. In this study, the authors followed the synthesis of Jensen et al (1959), andMustaffa &Illyas Md Isa (2011) but there are different ingredients and different amounts of the many substances used, the differences can be seen in Figure 2.…”

“…The HPMpFBp had been synthesized by Jensen et al (1959), andMustaffa &Illyas Md Isa (2011) but the HPMpFBP samples had not been characterized so that how many functional groups were present in the samples is still unknown. Then Saleh et al (1990), Meera et al (2004), Remya et al (2006), andPetrova et al (2011) have also synthesized and characterized HPMpFBP samples using Nuclear Magnetic Resonance (NMR) Spectroscopy and FTIR. However, they did not use Raman Spectroscopy as a comparison between the main ingredient, namely PMP (1-phenyl-3-methyl-5-pyrozolone) and HPMpFBP after being added with other ingredients.…”

“…The non-invasive methods used are Raman spectroscopy, Nuclear Magnetic Resonance (NMR) Spectroscopy and FTIR which will later provide information about wavelengths, chemical shifts and functional groups contained in the HPMpFBP sample. Furthermore, the results were compared with previous researches (Jensen et al, 1959;Meera & Reddy, 2004;Mustaffa & Illyas Md Isa., 2011;Petrova et al, 2011;Remya et al, 2006;Saleh et al, 1990). Then, we perform an analysis of the HPMpFBP sample whether it can be used for glucose detectors or not.…”

Extraction of Mn(II) Ions from Sulphate Solution by 1-Phenyl- 3-Methyl-4-Butyryl-Pyrazolone-5: Influence of pH, Sulphate Concentration, and Additional Complexing Agents

“…Derivatives of 1-phenyl-3-methyl-4-acyl-pyrazolone-5 have been used for a very long time in practical applications [1][2][3] due to their formation of very stable metal chelates [4][5][6][7] with various transition metals. Their application as versatile extraction reagents in liquidliquid extraction, separation, and speciation of metals have been investigated by many people.…”