Synthesis and photocatalytic performance of ZnO with flower-like structure from zinc oxide ore

doi:10.1016/j.jmst.2020.01.062

Abstract

Abstract:

AAAAAEmploying zinc sulfate solution obtained from zinc oxide ore as raw material, sodium hydroxide as precipitant and PEG20000 as dispersant, ultrafine ZnO powders with different morphologies were successfully synthesized through hydrothermal method. The influences of the dosage of PEG20000 solution, molar ratio of OH ^-/Zn ²⁺, reaction temperature, reaction time and Zn ²⁺ concentration on the structures and morphologies of the ZnO powders were discussed in detail. The reaction conditions of synthesizing ZnO powders with flower-like structure were obtained as below: dosage of PEG20000 with 10% mass fraction 5 mL, molar ratio of OH ^- to Zn ²⁺ 5, reaction temperature 150 °C, reaction time 8 h at Zn ²⁺ concentration 1 mol L ^-1. The growth mechanism of ZnO particles with different morphologies was proposed. The ZnO powder with flower-like structure are composed of multiple micro-rods with hexagon morphology and has good photocatalytic degradation ability to degrade RhB. 20 mL RhB solution with 15 mg L ^-1 could be completely degraded over flower-like ZnO powder 300 mg within 3 h.

Key words: ZnO with flower-like structure, Hydrothermal method, Growth mechanism, Photocatalysis

Xiaoyi Shen, Hongmei Shao, Yan Liu, Yuchun Zhai. Synthesis and photocatalytic performance of ZnO with flower-like structure from zinc oxide ore[J]. J. Mater. Sci. Technol., 2020, 51: 1-7.

Figures/Tables 8

Fig. 1. (a) XRD patterns and SEM images of ZnO powders obtained with different dosages of PEG20000 of (b) 2 mL, (c) 5 mL and (d) 8 mL.

Fig. 2. (a) XRD patterns and SEM images of ZnO powders obtained at different molar ratios of OH-/Zn2+ of (b) OH-/Zn2+ = 2, (c) OH-/Zn2+ = 5 and (d) OH-/Zn2+ = 10.

Fig. 3. (a) XRD patterns and SEM images of ZnO powders obtained at (b) 120 °C, (c) 150 °C and (d) 180 °C.

Fig. 4. (a) XRD patterns and SEM images of ZnO powders obtained at different reaction times of (b) 4 h, (c) 8 h and (d) 12 h.

Fig. 5. (a) XRD patterns and SEM images of ZnO powders obtained at different Zn2+ concentrations of (b) 0.5 mol L-1, (c) 1 mol L-1 and (d) 0.5 mol L-1.

Fig. 6. Zoomed SEM image (a) and EDS pattern (b) of ZnO rod of the flower-like structure.

Fig. 7. Schematic growth diagram of ZnO particles.

Fig. 8. Degradation ratios of RhB against time under ZnO powder presence: (a) ZnO powder with different morphologies; (b) dosage of ZnO powder; (c) concentration of RhB.

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