Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 99-106.doi: 10.13475/j.fzxb.20201004308

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Degradation kinetics and mechanism of Direct Blue 15 in photoactivated potassium persulfate system

HU Qian, YANG Hai(), LI Xin, CHEN Pinting, CHEN Zhen, YI Bing   

  1. Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, Hunan Institute of Engineering, Xiangtan, Hunan 411104, China
  • Received:2020-10-21 Revised:2021-07-12 Online:2021-10-15 Published:2021-10-29
  • Contact: YANG Hai E-mail:yanghai1001@163.com

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Abstract:

In order to explore the degradation feasibility of bisazo dye Direct Blue 15 (DB15) and its transformation mechanism under attack of reactive oxygen species (ROSs), the degradation kinetics and mechanism of DB15 was studied in UV/K2S2O8 system. The results show that the degradation of the bisazo dye DB15 in the UV/K2S2O8 system conforms to pseudo-first-order kinetics, with a kinetic constant rate of 0.010 7 min-1. Different K2S2O8 concentration, initial substrate concentration and reaction temperature have significant effects on its degradation kinetics. Finally, the degradation intermediates of DB15 were identified by gas chromatography-mass spectrometry. Combined with the frontier electron densities (FEDs) of DB15, the positions of N11, N24, N41, N42, and C28 are likely to be attacked or occurred the single electron transfer under the attack of $SO_4^-$·, ·OH and so on, which resulted in the cleavage of N=N and C—N bonds and further hydroxylation and mineralization of the degradation intermediates under the attack of the ROSs.

Key words: Direct Blue 15, photo-activated, degradation kinetics, mechanism, reactive oxygen specie

CLC Number: 

  • X131

Fig.1

Light source and reaction device"

Fig.2

Degradation of DB15 in different systems (a) and relationship between -ln(c/c0) and time(b)"

Fig.3

Degradation curves of DB15 under different K2S2O8 dosage (a) and effect of K2S2O8 dosage on degradation kinetics of DB15(b)"

Fig.4

Degradation curves of DB15 under different substrate concentration (a) and effect of substrate concentration on degradation kinetics of DB15(b)"

Fig.5

Degradation curves of DB15 under different reaction temperature (a) and effect of different reaction temperature on degradation kinetics of DB15(b)"

Fig.6

EPR spectrum of free radicals in UV/K2S2O8 system"

Fig.7

TIC chromatogram of degradation intermediates for DB15 extracted with EA (a) and DCM (b)"

Tab.1

Plausible degradation intermediates of DB15 in UV/K2S2O8 system"

降解产物
编号		 质荷比
m/z		 保留时间/
min		 质谱主要碎片的质
荷比m/z		 可能的降解产物
名称		 谱库相似
度/%		 萃取剂
P1 111 9.3 55,83,84 对苯二酚 81 EA
P2 192 18.6 152,165,179 多羟基取代产物 80 EA
P3 219 22.1 97,165 联苯四醇 83 EA
P4 139 23.6 57,97 4-氨基-3-甲氧基苯酚 87 EA
P5 155 24.9 83,141 4-硝基苯-1,3-二醇 85 EA
P6 331 25.4 207,279,281 N N键断裂产物 86 EA
P7 126 27.8 59,83 1,2,4-苯三醇 88 EA
P8 112 5.4 71,84,99 邻二苯酚 90 DCM
P9 191 13.3 115,163,173 7-氨基萘-1,3,5-三醇 87 DCM
P10 223 17.4 83,111,149 7-硝基萘-1,3,5-三醇 93 DCM
P11 125 23.6 57,71,111 4-氨基苯-1,3-二醇 80 DCM

Tab.2

DB15 frontier electron densities (FEDs) calculation results"

原子序号 2 FE D HOMO 2 2 FED LUMO 2 FED HOMO 2+ FE D LUMO 2 原子序号 2 FE D HOMO 2 2 FE D LUMO 2 FE D HOMO 2+ FE D LUMO 2
C1 0.128 6 0.046 9 0.087 8 C32 0.002 3 0.007 8 0.005 1
C2 0.076 2 0.031 0 0.053 6 C33 0.023 1 0.040 0 0.031 6
C3 0.014 9 0.059 6 0.037 3 C34 0.016 2 0.028 3 0.022 2
C4 0.000 8 0.119 7 0.060 2 C35 0.004 5 0.018 6 0.011 5
C5 0.152 5 0.000 3 0.076 4 C36 0.032 9 0.048 2 0.040 6
C6 0.037 1 0.103 7 0.070 4 C37 0.006 5 0.020 9 0.013 7
C7 0.082 2 0.105 3 0.093 7 C38 0.012 7 0.025 3 0.019 0
C8 0.165 0 0.075 4 0.120 2 O39 0.001 4 0.002 5 0.001 9
C9 0.015 9 0.102 5 0.059 2 C40 0.000 5 0.004 6 0.002 6
C10 0.105 3 0.001 8 0.053 5 N41 0.006 4 0.036 5 0.121 4
N11 0.035 7 0.210 2 0.123 0 N42 0.015 0 0.045 3 0.130 2
O12 0.051 5 0.024 3 0.037 9 C43 0.010 3 0.025 2 0.017 7
N13 0.148 5 0.012 2 0.080 4 C44 0.000 6 0.024 1 0.012 4
S14 0.000 3 0.002 7 0.001 5 C45 0.006 9 0.001 1 0.004 0
O15 0.001 1 0.005 8 0.003 5 C46 0.002 5 0.020 9 0.011 7
O16 0.001 4 0.004 9 0.003 1 C47 0.000 3 0.019 0 0.009 6
O17 0.001 3 0.001 5 0.001 4 C48 0.010 3 0.021 6 0.016 0
S19 0.000 3 0.004 2 0.002 2 C49 0.002 1 0.004 7 0.003 4
O20 0.001 4 0.001 7 0.001 5 C50 0.003 8 0.026 4 0.015 1
O21 0.002 5 0.007 4 0.004 9 C51 0.001 6 0.004 0 0.002 8
O22 0.000 8 0.004 4 0.002 6 C52 0.003 9 0.009 9 0.006 9
N24 0.071 9 0.247 2 0.159 6 O53 0.007 3 0.004 7 0.006 0
C25 0.058 0 0.080 8 0.069 4 N54 0.000 8 0.000 6 0.000 7
C26 0.016 8 0.106 5 0.061 7 S55 0.000 0 0.000 8 0.000 4
C27 0.025 6 0.012 2 0.018 9 O56 0.000 0 0.000 5 0.000 2
C28 0.050 8 0.121 8 0.086 3 O57 0.000 0 0.000 7 0.000 4
C29 0.006 0 0.045 8 0.025 9 O58 0.000 1 0.000 2 0.000 1
C30 0.029 9 0.087 0 0.058 5 S60 0.000 0 0.001 2 0.000 6
C31 0.010 4 0.005 8 0.008 1 O61 0.000 2 0.001 8 0.001 0

Fig.8

Proposed degradation pathways of DB15 in UV/K2S2O8 system"

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