Facile synthesis of vanadia aerogels with controlled V3+/V4+ ratio

Balakhonov, S. V.; Efremova, M. V.; Ivanov, V. K.; Чурагулов, Б. Р.

doi:10.1016/j.matlet.2015.04.131

Cited by 10 publications

(1 citation statement)

References 23 publications

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“…Figure 2 d shows the XPS V 2p spectra of V-MTA. The peaks centered at ~521.8 and 514.4 eV were assigned to V 2p 1/2 and V 2p 3/2 of V 3+ , which was close to V(OH) 3 [ 28 , 29 ]. Therefore, the results indicate that some of the Fe 3+ /V 3+ hydrolyzed with TiO 2+ at high temperature and entered the lattice of anatase nanocrystals so these impurities could not be removed by dilute H 2 SO 4 or water.…”

Section: Resultsmentioning

confidence: 99%

Co-Removal of Fe/V Impurity in H2TiO3 Synthesized from Ti-Bearing Blast Furnace Slag

Yang,

Peng,

Wang

et al. 2023

Nanomaterials

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Ti-bearing blast furnace slag (TBFS) can be converted to impurity bearing TiOSO4 solution for TiO2 pigment production. However, the H2TiO3 (MTA) hydrolyzed from the solution has too high Fe/V impurity to meet the standard for TiO2 pigment. In this study, we found that Fe3+ and V3+ were easily hydrolyzed and entered the MTA lattice, and hence could not be removed by washing. Furthermore, Fe/V was hard to co-remove by the traditional reduction method. Therefore, the Fe/V non-hydrolysis condition (Ti3+ = 0.01 M, F = 3.0, T = 130 °C; Ti3+ = 0.01 M, F = 3.5, T = 150 °C) was determined by thermodynamic calculations. However, at these conditions, the Ti hydrolysis ratio was low or the reaction time was long. Therefore, a new two-step hydrothermal hydrolysis process was proposed. Step 1 (130 °C, 2 h) ensured the non-hydrolysis of V3+, and Ti was partially hydrolyzed to increase the H2SO4 concentration. Step 2 (150 °C, 2 h) ensured a high Ti hydrolysis ratio (>0.95) and short total reaction time (4–6 h). Finally, a high-purity MTA was obtained (Fe = 21 ppm, V = 145 ppm). These results provide new insights into the control of the hydrolysis of impurity ions in solutions and help to optimize the process of TiO2 pigment preparation from TBFS.

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Section: Resultsmentioning

confidence: 99%