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Nanomaterials 2020, 10, 1321 3 of 15 Nanomaterials 2020, 10, x FOR PEER REVIEW 3 of 15 The solid residue was washed three times with ethanol and was placed in the oven for 24 h at 105 °C. was in the range 13.0–13.5, and in the remaining runs, it reached 13.7–14.0. At the end of each test, The obtained powder was then characterized and the size distribution and average diameter, d [nm], the Zn(OH)2 precipitated and was separated from the liquid by centrifugation (12,000 rpm, 15 min). were measured by the Dynamic Light Scattering method, using a Zetasizer Nano ZS (Malvern The solid residue was washed three times with ethanol and was placed in the oven for 24 h at Panalytical, Westborough, MA, USA), and the pH was measured using a Crison pH-meter 105 ◦C. The obtained powder was then characterized and the size distribution and average diameter, (Barcellona, Spain). The pH value during measurements was almost the same for all of the samples, d [nm], were measured by the Dynamic Light Scattering method, using a Zetasizer Nano ZS (Malvern and equal to 6.0. The yield of ZnO was measured as the ratio between ZnO produced mass and Zn(II) Panalytical, Westborough, MA, USA), and the pH was measured using a Crison pH-meter (Barcellona, initial mass. The most convincing productions were characterized using a SEM-EDS (Zeiss, Spain). The pH value during measurements was almost the same for all of the samples, and equal to 6.0. The yield of ZnO was measured as the ratio between ZnO produced mass and Zn(II) initial mass. The most convincing productions were characterized using a SEM-EDS (Zeiss, Oberkochen, Germany). Figure 1. Spinning disk reactor (SDR) schematization. Figure 1. Spinning disk reactor (SDR) schematization. Initially, the Zn(II) and KOH molar concentrations were set equal to 0.02 and 0.08 M, and the Table 1. Experimental conditions adopted in the 25 runs. maximum rotational velocity (1400 rpm) value was fixed, according to the optimal results obtained on metallic iron naIDnopQarZtnic(lLe/sminina) pQreKvOiHou(Ls/wmoirnk) [3Z4n],(IvIa)r(yMin)g KboOthHth(Me r)eaωge(nrpt smo)lutrio(ncmfl)owrate (0.025, 0.050, 0.075 and10.100 L/m25in) and ri (1.52,52.0, 2.5 and03.0.02cm). On0c.e08the opti1m40a0l reage1n.t5flowrate and ri values were fou2nd, all o5f0the operatin5g0parameters0.w02ere fixed0,.v08arying ω14(0200, 4010.,5800, 1200 rpm). Therefore, once3the ω 1o0p0timal value1w00as found, 0th.0e2Zn(II) a0n.d08KOH m14o0l0ar con1c.e5ntrations were varied (0.05/0.204, 0.10/0.4205, 0.20/0.80, 0.255/2.0 and 1.00/4.0.02M, respe0c.0ti8vely). F1i4n0a0lly, an a2dditional 4 runs were carried ou5t, fixing5t0he reagent fl5o0wrates at 0.05.0L2/min and0.0v8arying 1th4e00Zn(II) 2and KOH molar concentrations (60.5/2.0, 100.705/3.0, 1.0/4.010a0nd 2.0/8.0 M0.,0r2espective0l.y0)8. Each e1x4p00eriment2was carried out in duplicate, an7d the ave2r5age values of2t5he obtained0.r0e2sults wer0e.0r8eported1.400 2.5 Oberkochen, Germany). 8 50 50 0.02 0.08 1400 2.5PDF Image | Spinning Disk Reactor Nano Production Intensification
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