Co-sensitization in the Visible Light/H2O2 System †

doi:10.7503/cjcu20190588

Abstract

Abstract:

The causes of co-sensitization in the visible light/H₂O₂ system was analyzed. Through the analysis of the UV-Vis spectra of the phenol red, methyl orange, azure I and the mixed solution which consisted of all the three solutions mentioned above, it was seen that the mixed solution broadened the response range in the visible light region so that the utilization rate of visible light was increased. The yields of photoinduced electron(hydrated electron), singlet oxygen and superoxide anion radical generated under visible light in these matters mentioned above were tested by 1, 10-phenanthroline method, 1, 5-diphenylcarbazide method and ammonium molybdophosphate spectrophotometry. The result showed that the yields of superoxide anion radical in the mixed solution was significantly higher than that of the single chromophoric dissolved organic matters, more-over, the yields of photoinduced electron and singlet oxygen were not much different in each solution. Hence the increase of superoxide anion radical production is the main reason for the co-sensitization. In addition, experimental results confirmed that photoinduced electron could not catalyze hydrogen peroxide to generate hydroxyl radical.

Key words: Photoinduced electron, Singlet oxygen, Superoxide anion radical, Synergistic sensitization

CLC Number:

O644.11

TrendMD:

YANG Jin,CAO Yan,ZHANG Naidong. Co-sensitization in the Visible Light/H₂O₂ System ^†[J]. Chem. J. Chinese Universities, 2020, 41(3): 505.

Figures/Tables 8

References 24

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Colored substance	A
Colored substance	Before illumination	After illumination for 2 h
Phenol red	0.443	0.442
Methyl orange	1.351	1.353
AzureⅠ	0.512	0.510
Methyl orange+phenol red	1.013	1.016
AzureⅠ+methyl orange+phenol red	0.536	0.535
Direct fast brown M	0.467	0.469
Dianil brown 3GN	0.375	0.374

Colored substance	A
Colored substance	Before illumination	After illumination for 2 h
Phenol red	0.443	0.442
Methyl orange	1.351	1.353
AzureⅠ	0.512	0.510
Methyl orange+phenol red	1.013	1.016
AzureⅠ+methyl orange+phenol red	0.536	0.535
Direct fast brown M	0.467	0.469
Dianil brown 3GN	0.375	0.374

Colored substance	ΔA_{510 nm}
Colored substance	Ultraviolet	Visible light	Dark
Phenol red(yellow)	0.077	0.141	0
Methyl orange(red)	0.109	0.152	0
AzureⅠ(blue)	0.021	0.043	0
Methyl orange+phenol red(orange)	0.068	0.137	0
AzureⅠ+methyl orange+phenol red(brown)	0.114	0.157	0
Direct fast brown M(brown)	0.064	0.168	0
Dianil brown 3GN(brown)	0.060	0.186	0

Colored substance	ΔA_{510 nm}
Colored substance	Ultraviolet	Visible light	Dark
Phenol red(yellow)	0.077	0.141	0
Methyl orange(red)	0.109	0.152	0
AzureⅠ(blue)	0.021	0.043	0
Methyl orange+phenol red(orange)	0.068	0.137	0
AzureⅠ+methyl orange+phenol red(brown)	0.114	0.157	0
Direct fast brown M(brown)	0.064	0.168	0
Dianil brown 3GN(brown)	0.060	0.186	0

Colored substance	ΔA_{563 nm}
Colored substance	Ultraviolet	Visible light
Phenol red	0	0.022
Methyl orange	0	0.029
AzureⅠ	0	0.052
Methyl orange+phenol red	0	0.048
AzureⅠ+methyl orange+phenol red	0	0.043
Direct fast brown M	0	0.016
Dianil brown 3GN	0	0.024

Co-sensitization in the Visible Light/H₂O₂ System ^†

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Concentration of direct fast brown M/(mmol·L^-1)	ΔA_{720 nm}	A_{420 nm}
0.003	0	0
0.005	0.017	0
0.01	0.024	0.737
0.02	0.029	0.962
0.03	0.043	0.996

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