Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (03): 118-124.doi: 10.13475/j.fzxb.20180302507

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Bentonite supported Zn-Co ozone catalyst for treatment of simulated dye wastewater

SUN Huiping, LÜ Wenzhou()   

  1. Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo, Zhejiang 315211, China
  • Received:2018-03-10 Revised:2018-12-03 Online:2019-03-15 Published:2019-03-15
  • Contact: Lü Wenzhou E-mail:wenzhoulv@yahoo.com

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Abstract:

In order to obtain an efficient ozone catalyst, bentonite was used as carrier, and Fe3+, Cu2+, Mn2+, Ni2+, Co2+ and Zn2+ were selected as active components to prepare supported catalysts by a solution mixing method. The influence of supported catalysts on degradation rate and kinetic characteristics of acid red in catalytic oxidation system were studied, and then the best active components were obtained. According to orthogonal experimental design, the best catalyst preparation conditions were achieved, and characterized by X-ray diffraction and scanning electron microscopy. The results show that the best two-component catalyst is bentonite supported Zn-Co. The optimum conditions for the preparation of the two-component catalyst are as followed: the calcination temperature is 400 ℃, calcination time is 3 h, component concentration is 1.2 mol/L, mole ratio of Zn and Co is 1∶1 and starch content is 1.5 g (in terms of 60 g bentonite). The catalyst prepared under the conditions catalyzes the oxidation of acid red with ozone, and the removal rate reaches 99.92% after 10 min of ozone reaction. After the catalyst is reused for 4 times, the removal rate still reaches 81.44%.

Key words: bentonite, zinc-cobalt catalyst, ozone catalyst, acid red, dye wastewater

CLC Number: 

  • TS19

Fig.1

Removal rate of acid red in wastewater by two-component catalyst"

Tab.1

Design and results of orthogonal test for two-component catalysts"

试验
号		 煅烧
温度/℃		 煅烧
时间/
h		 组分
浓度/
(mol·L-1)		 Zn2+与
Co2+的
量比		 淀粉
质量/
g		 酸性
大红去
除率/
%
1# 300 2 1.0 2∶1 1.2 64.33
2# 300 3 1.2 1∶1 1.5 73.32
3# 300 4 1.4 1∶1.5 1.8 63.85
4# 300 5 1.6 1∶2 2.1 48.44
5# 400 2 1.0 1∶1.5 2.1 90.95
6# 400 3 1.2 1∶1 1.5 99.92
7# 400 4 1.6 2∶1 1.8 98.43
8# 400 5 1.4 1∶2 1.2 96.53
9# 500 2 1.4 1∶2 1.5 91.97
10# 500 3 1.6 1∶1.5 1.2 95.72
11# 500 4 1.0 1∶1 2.1 96.44
12# 500 5 1.2 2∶1 1.8 94.99
13# 600 2 1.6 1∶1 1.8 98.25
14# 600 3 1.4 2∶1 2.1 94.21
15# 600 4 1.2 1∶2 1.2 95.84
16# 600 5 1.0 1∶1.5 1.5 97.46
K1 61.735 86.375 88.742 87.990 88.655
K2 96.213 89.997 88.775 91.685 90.295
K3 94.780 88.640 87.190 86.995 88.457
K4 96.440 84.155 84.460 82.498 81.760
R 34.705 5.842 4.315 9.187 8.535

Fig.2

Kinetic curves of catalytic oxidation of optimum catalysts and single ozone oxidation"

Fig.3

Removal rate of acid red by recycled two-component catalyst"

Fig.4

XRD spectra of optimum catalysts and bentonite"

Fig.5

SEM images of bentonite and optimum catalysts (×7 000). (a) Bentonite; (b) Zn one-component catalyst;(c) Zn-Co two-component catalyst"

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