Synthesis of Multi-layered Spherical ZnO Micro/Nano-crystals by Hydrothermal Method from Deep Eutectic Solvent and Their Photo Catalytic Performance†

doi:10.7503/cjcu20140445

Abstract

Abstract:

Multi-layered spherical ZnO micro/nano-crystals were synthesized by means of hydrothermal and antisolvent method from the urea-choline chloride deep eutectic solvent(UCC-DES). The effects of reaction time, amount and concentrations of antisolvents on the morphology of ZnO micro/nano-crystals were investi-gated, and the formation of ZnO micro/nano-crystals was discussed. Furthermore, the photocatalytic activities of the as-prepared ZnO crystals for the degradation of methyl orange were investigated. The results indicate that multi-layered spherical ZnO micro/nano-crystals exhibit a superior photocatalytic activity.The synthetic method of ZnO is facile, safe and environmentally friendly, it is in line with the requirements of green chemistry and should have widespread application in the future.

Key words: Deep eutectic solvent(DES), Antisolvent, ZnO, Micro/nanocrystals

CLC Number:

O644
O614.2

TrendMD:

LI Aoqi, CHEN Yujuan, HU Xiaoyu, ZHUO Kelei. Synthesis of Multi-layered Spherical ZnO Micro/Nano-crystals by Hydrothermal Method from Deep Eutectic Solvent and Their Photo Catalytic Performance^†[J]. Chem. J. Chinese Universities, 2015, 36(1): 165.

Figures/Tables 6

Table 1 Summarized ZnO samples and their corresponding synthesis conditions

Sample No.	Volume of ethanol aqueous solution/mL	Reaction time/h	Sample No.	Volume fraction of alcohol(%)	Volume of ethanol aqueous solution/mL	Reaction time/h
1	50	5	5	20	50	10
2	80	5	6	20	80	10
3	50	10	7	50	50	10
4	80	10	8	50	80	10

Fig.1 SEM images(A, B) and XRD patterns(C, D) of the ZnO samples prepared at 100 ℃ for 5 h in 50 mL(A, C) and 80 mL(B, D) water

Fig.2 SEM images(A, B) and XRD patterns(C, D) of the ZnO samples prepared at 100 ℃ for 10 h in 50 mL(A, C) and 80 mL(B, D) water

Fig.3 SEM images(A, B) and XRD patterns(C, D) of the ZnO samples prepared at 100 ℃ for 10 h in 50 mL(A, C) and 80 mL(B, D) 20% ethanol solution

Fig.4 SEM images(A, B) and XRD patterns(C, D) of the ZnO samples prepared at 100 ℃ for 10 h in 50 mL(A, C) and 80 mL(B, D) 50% ethanol solution

Fig.5 Degradation rate of methyl orange with sample 2(a) and sample 8(b)

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