Mechanism of Photocatalytic Degradation of Rhodamine B by TiO2 Nanowire Array with Internal Extraction Electrospray Ionization Mass Spectrometry

doi:10.7503/cjcu20200165

Abstract

Abstract:

By means of hydrothermal synthesis, the TiO₂ nanowire array was prepared on the SnO₂ conductive glass(FTO) substrate doped with F, and it was combined with the internal extraction electrospray ionization mass spectrometry(iEESI-MS) to realize the detection of Rhodamine B intermediate product and the conjecture of its reaction mechanism. The effects of ion source voltage, ion transmission tube temperature and eluting agent on the signal strength of rhodamine B and its degradation products were systematically investigated. The results showed that the optimum Rhodamine B intermediate product and its degradation product signal could be obtained under the condition that the photocatalytic reaction time was 2 h, the reaction solution volume was 15 μL, the ion source voltage was 3 kV, the ion transmission tube temperature was 300 ℃, and the eluting agent was 0.5% methanol-acetic acid(volume ratio). Under the optimized conditions, 8 kinds of intermediate products were detected from Rhodamine B reaction solution, and the degradation mechanism of rhodamine B was inferred. In this method, the detection limit(S/N≥3) of rhodamine B quantitative analysis is 0.1 μg/L, and the relative standard deviation(RSD, n=6) is 2.1%—7.3%, which shows that this method has the characteristics of low testing limit, high sensitivity, less sample consumption during detection, fast analysis speed and simple operation. In addition, this method can also be used to detect the intermediate products of other photocatalytic reactions, widen the application of mass spectrometry in the field of environment, and provide new ideas for the future exploration of the degradation mechanism of environmental pollutants.

Key words: TiO₂ nanowire arrays, Internal extraction electrospray ionization mass spectrometry, Rhodamine B, Photocatalytic degradation

CLC Number:

O657

TrendMD:

LI Xiaoqian, ZHANG Hua, LU Haijian, LIU Chang, LIU Qinglong, MA Xiayu, FANG Yuanping, LIANG Dapeng. Mechanism of Photocatalytic Degradation of Rhodamine B by TiO₂ Nanowire Array with Internal Extraction Electrospray Ionization Mass Spectrometry[J]. Chem. J. Chinese Universities, 2020, 41(9): 2003.

Figures/Tables 9

References 30

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Compound	[M-H]^-		Fragment	Molecular formula	10⁶ Error
Compound	Experimental	Calculated	Fragment	Molecular formula	10⁶ Error
Malonic acid	103.03925	103.01041	*	C₃H₄O₄	*
Maleic acid	115.07556	115.01041	*	C₄H₄O₄	*
Succinic acid	117.05484	117.02606	*	C₄H₆O₄	*
Phthalic acid	165.01851	166.02626	*	C₈H₆O₄	*
DER	331.14527	331.10772	313, 287	C₂₀H₁₅O₃N₂	0.721
EER	359.14078	359.13902	344, 330, 315	C₂₂H₁₉O₃N₂	4.901
ER	387.17032	387.17032	358, 343, 332	C₂₄H₂₃O₃N₂	0
R	415.20211	415.20162	371, 360	C₂₆H₂₇O₃N₂	1.180

Compound	[M-H]^-		Fragment	Molecular formula	10⁶ Error
Compound	Experimental	Calculated	Fragment	Molecular formula	10⁶ Error
Malonic acid	103.03925	103.01041	*	C₃H₄O₄	*
Maleic acid	115.07556	115.01041	*	C₄H₄O₄	*
Succinic acid	117.05484	117.02606	*	C₄H₆O₄	*
Phthalic acid	165.01851	166.02626	*	C₈H₆O₄	*
DER	331.14527	331.10772	313, 287	C₂₀H₁₅O₃N₂	0.721
EER	359.14078	359.13902	344, 330, 315	C₂₂H₁₉O₃N₂	4.901
ER	387.17032	387.17032	358, 343, 332	C₂₄H₂₃O₃N₂	0
R	415.20211	415.20162	371, 360	C₂₆H₂₇O₃N₂	1.180

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Mechanism of Photocatalytic Degradation of Rhodamine B by TiO₂ Nanowire Array with Internal Extraction Electrospray Ionization Mass Spectrometry

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