Hierarchical Porous ZnO Nanomaterial Synthesized with Corn Straw as Biological Templates and Its Photocatalytic Performance†

doi:10.7503/cjcu20180110

Abstract

Abstract:

Hierarchical porous ZnO nanomaterial was prepared using corn straw as biological template via roasting process. The components and crystal characterization of the material were investigated via X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), nitrogen adsorption-desorption analysis and UV-Vis spectrophotometry. The results show that the ZnO material synthesized by template method is wurtzite type. And the crystal particle size is 46.2 nm, the specific area is 32.8 m²/g. Irradiated with Xenon lamp, the rate of decolorization of methylene blue of ZnO material prepared by template method reaches 98%, which is 1.3 times of that prepared without template(74%). Moreover, the influence of pollutant concentration and dosage of catalyst were also investiggted. And the results reveal that ZnO materials synthesized by template method own low grain size but high specific surface area, when 0.15 g catalyst was used to degrade 100 mL of 20 mg/L(MB) solution for five times, the degration rate remained at 95%.

Key words: Bio-template, Corn straw, ZnO, Hierarchical porous structure, Photocatalysis

CLC Number:

O644
X703

TrendMD:

HUANG Yuting,YING Zuping,ZHENG Jixing,ZHUANG Sigeng,LIU Lu,FENG Wei. Hierarchical Porous ZnO Nanomaterial Synthesized with Corn Straw as Biological Templates and Its Photocatalytic Performance^†[J]. Chem. J. Chinese Universities, 2018, 39(9): 2031.

Figures/Tables 14

Fig.1 XRD patterns of samples T-ZnO(a) and N-ZnO(b)

Fig.2 SEM images of corn straw(A) and T-ZnO(B—D)

Fig.3 TEM image(A) and HRTEM images(B, C) of T-ZnO Inset shows the SAED image of T-ZnO.

Fig.4 TG and DTA curves of corn straw after solution impregnation

Fig.5 N2 adsorption-desorption isotherm(A) and pore size distribution(B) of T-ZnO

Fig.6 UV-Vis diffuse reflectance spectra of T-ZnO(a) and N-ZnO(b)

Fig.7 XPS spectra of the synthesized powder(A) Wide scan survey; (B) core level spectrum for Zn2p region; (C) core level O1s spectrum, fitted with Gaussian-Lorentz distribution with Shirley type base line

Fig.8 Absorption spectra of MB dye solutions after different time irradiation(A) and the color change of methylene blue solution during irradiation(B)

Fig.9 Kinetic curves of MB(100 mL) degradation under xenon lamp irradiation(A), (B) In the presence of T-ZnO and N-ZnO, c(MB)=20 mg/L; (C), (D) in the presence of T-ZnO with different MB concentrations; (E), (F) c(MB)=20 mg/L, with different amounts of T-ZnO.

Table 1 Photocatalytic degradation efficiencies of ZnO nanomaterials with different morphologies toward MB dye under UV light irradiation

Catalyst	Synthetic method	Catalyst loading/mg	Concentration and volume	Irradiatin time/min	Degradation (%)	Ref.
ZnO nanorods	Hydrothermal method	50	10 mg/L, 100 mL	380	82	[26]
ZnO	Precipitation method	25	20 mg/L, 100 mL	180	81
ZnO	Sol-gel method	25	20 mg/L, 100 mL	180	92	[27]
ZnO particles	Chemical precipitation method	50	5 mg/L, 300 mL	1103	97.2	[28]
ZnO flower-like hierarchical	Hydrothermal synthesis	50	10 mg/L, 60 mL	60	13	[29]
ZnO-C	Codeposition	100 mg/L	100 mg/L	60	20	[30]
C₃N₄/ZnO	Mechanical milling combined with calcination	150	150 mL, 1×10^-5 mol/L	180	90	[31]
ZnO nano-powder	Solution combustion synthesis	50	25 mg/L, 100 mL	120	86	[32]
ZnO hierarchical porous	Bio-template	50	20 mg/L, 100 mL	180	98	This work

Fig.10 Mineralization research of photocatalytic process of MB

Fig.11 Reusability of sample T-ZnO a. 1st; b. 2nd; c. 3rd; d. 4th; e. 5th.

Fig.12 ESR spectra of radical(·O2- and ·OH) adducts trapped by DMPO in T-ZnO with the xenon lamp

Fig.13 Mechanism of photocatalytic degradation of ZnO

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