Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (11): 131-139.doi: 10.13475/j.fzxb.20181000409

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Degradation kinetics and mechanism of Acid Red 37 under attack of sulfate radicals

ZHUANG Shuai1, YANG Hai1(), AN Jibin2, HU Qian1, ZHANG Hao1, HE Guitian1, YI Bing1   

  1. 1. Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, Hunan Institute of Engineering, Xiangtan, Hunan 411104, China
    2. Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, Chongqing University of Arts and Sciences, Chongqing 402160, China
  • Received:2018-10-08 Revised:2019-08-11 Online:2019-11-15 Published:2019-11-26
  • Contact: YANG Hai E-mail:yanghai1001@163.com

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Abstract:

In order to explore the degradation possibility of Acid Red 37 (AR37) under the attack of sulfate radicals, the system of UVC-activated potassium persulfate (PDS) was obtained in mixed solution of acetonitrile (ACN) and water. Firstly, the degradation feasibility of AR37 in different solutions, such as dimethyl sulfoxide (DMSO), N-N-dimethylformamide (DMF), ACN and water, was compared. And then the influences of the dosage of PDS, the concentration of substrate, the reaction temperature and the UVC light intensity on the degradation kinetics of AR37 were studied in the system of UVC/PDS/(90%ACN+10%H2O). Lastly, the degradation intermediates of AR37 were identified by HPLC/MS/MS and the transformation mechanism was proposed. The results indicated that AR37 can be degraded in the system of UVC/PDS/(90%ACN+10%H2O). The removal efficiency of AR37 is more than 98% and the pseudo-first-order rate is 0.123 min-1. Higher temperature and light intensity facilitate producing the sulfate free radical, which is helpful for the degradation of AR37; and the sulfate free radical plays an important role in the degradation of AR37 in the system of UVC/PDS/(90%ACN+10%H2O). Based on the degradation intermediates, the degradation pathway is deduced, such as the cleavage of azo bond and the desulfonation due to single electron transfer of the sulfate free radical, as well as hydroxylation products from hydrogen-abstracted and substitution reaction.

Key words: Acid Red 37, azo dye, dye wastewater, degradation kinetics, photo-activated

CLC Number: 

  • X131

Fig.1

Chemical structure of AR37"

Fig.2

Degradation effect of AR37 in different solvents"

Fig.3

Degradation curves of AR37 in four kinds systems of ACN solvents(a) and relatonship between-ln(C/C0) and time(b)"

Fig.4

Degradation curves of AR37 under different PDS dosage(a)and effect of PDS dosages on degradation kinetics of AR37(b)"

Fig.5

Degradation curves of AR37 under different substrate concentration(a) and effect of substrate concentration on degradation kinetics of AR37(b)"

Fig.6

Degradation curves of AR37 under different reaction temperature (a) and effect of different reaction temperature on degradation kinetics of AR37 (b)"

Fig.7

Degradation curves of AR37 under different light intensity (a) and Effects of different light intensity on the degradation kinetics of AR37(b)"

Fig.8

Homolysis of S2O82-"

Fig.9

Degradation curves of AR37 after addition of EtOH(a),TBA(b)and comparison on degradation rate(c)"

Fig.10

EPR spectra of UVC/PDS in different solvents system after 10 min reaction"

Fig.11

TIC chromatography of AR37 after 15 min reaction in UVC/PDS/(90%ACN+10%H2O) system"

Tab.1

Proposed structure of AR37"

降解产物
编号		 保留时间/min 质荷比(m/z) 分子式 可能降解产物 反应体系
实验值 理论值
P1 5.95 495.025 6 495.023 1 C18H14N4O9S2 单羟基化产物 体系1和3
P2 6.57 416.087 3 416.071 8 C18H15N4O6S 脱单磺酸基后单羟基取代产物 体系1和3
P3 6.71 400.095 4 400.076 9 C18H15N4O5S 脱单磺酸基产物 体系1和3
P4 7.19 255.043 2 255.012 9 C10H8NO5S 4,5-二羟基-6-氨基萘-2-磺酸 体系1,2和3
P5 7.52 192.077 1 192.058 2 C10H9NO3 7-氨基-1,3,8-萘三醇 体系1和3
P6 7.86 353.132 4 353.117 2 C18H16N4O4 脱双磺酸基后二羟基取代产物 体系1,2和3
P7 7.96 206.041 1 206.037 5 C10H7NO4 2-硝基-1,8-萘二醇 体系1,2和3
P8 8.25 337.134 3 337.122 2 C18H16N4O3 脱单磺酸基后单羟基取代产物 体系1,2和3
P9 8.70 181.066 1 181.053 5 C8H8N2O3 对硝基乙酰苯胺 体系1和3
P10 9.15 151.089 7 151.079 3 C8H10N2O 对氨基乙酰苯胺 体系1,2和3

Fig.12

Proposed degradation mechanism of AR37 in system of UVC/PDS/(90%ACN+10%H2O)"

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