Effect of isopropanol co-product on the long-term stability of TiO2 nanoparticle suspensions produced by microwave-assisted synthesis

Microwave-Assisted Vacuum Synthesis of TiO2 Nanocrystalline Powders in One-Pot, One-Step Procedure

“…Once the possibility to reproduce suspension’s stability was confirmed, and mineralogic composition and morphology of the industrial product with the simple and fast MW synthesis were reported, the photocatalytic activity of the sample TiO 2 _60_Powd was examined in order to compare NO depletion efficiency of the sample with the one shown by the industrial product PH00025. Tests were carried out as reported in Section 2.5 [ 17 , 36 ]. Kinetic trends of residual NO concentration obtained during photocatalytic tests on samples PH000025 and TiO 2 _60_Powd are reported in Figure 7 , and the percentage of NO depletion after 105 min is also reported in Table 5 .…”

“…A Microwave apparatus (ETHOS TOUCH, Milestone s.r.l., Sorisole, Italy) was modified adequately in order to distill the solvent mixture from a three-necked flask. The experimental setup is accurately described in a previous study [ 17 ], and a landscape image of the system highlighting its main components and the pathway of solvent during distillation is presented in Figure 1 . Briefly, the original microwave carousel was disassembled and replaced with a refractory material able to accommodate a three-necked flask.…”

“…The apparatus and the test execution used for the analyses are patented by Ce.Ri.Col. Colorobbia Research Center, Colorobbia Consulting S.R.L., Sovigliana-Vinci, Italy, and are described in detail elsewhere [ 17 , 37 ]. Briefly, the apparatus consists of a closed reaction chamber where moisture and NO are introduced, and their concentrations are controlled automatically through a given software program.…”

“…For this reason, exploring MW heating and other methods for the fast synthesis of TiO 2 nanoparticles can be valuable research for the chemical industry. Given our interest in MW-assisted TiO 2 synthesis, in our previous paper [ 17 ], we designed a modified MW system for the synthesis of TiO 2 nanoparticles, with the possibility of microwave-aided solvent distillation as a post-processing step. In that paper, we proved that the distillation of isopropanol is beneficial both for the obtainment of low nanoparticle size and for suspension stability, as already proved for nano TiO 2 solvothermal preparation by other researchers [ 18 ].…”

Ni Underlayer Effect for the Structure Development and Visible Light Photocatalytic Efficiency of Carbon-Doped TiO2 Film

“…Photocatalytic purification of waste water [12], disinfection of liquids (or environmental surfaces) [13] and self-cleaning windows [14] are just a few examples of sustainable environment oriented AOPs [15] which thrusted the development of TiO2 based photocatalysts research [16]. Up to now TiO2 synthesis has been realised by the countless number of methods based on sol-gel [17], microemulsionmediated processes [18], electrodeposition [19], hydro/solvothermal processes [20], anodisation [21], sonochemical [22] and microwave-assisted techniques [23], chemical vapour deposition [24], physical vapour deposition [25], spray pyrolysis [19], etc. Most of the early studies synthesised TiO2 by wet chemical methods and produced it in powder form.…”