Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (03): 125-132.doi: 10.13475/j.fzxb.20180102208

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of cobalt aluminate/ceramic honeycomb catalyst and application thereof in dye wastewater treatment

ZHANG Lanhe1,2(), ZHANG Mingshuang1, GAO Weiwei1, LI Zheng1, JIA Yanping1, GAO Min3, LING Liangxiong1   

  1. 1. College of Chemical Engineering, Northeast Electric Power University, Jilin, Jilin 132012, China
    2. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University,Changchun, Jilin 130118, China
    3. Beijing Agro-Biotechnology Research Center, Beijing 100089, China
  • Received:2018-01-10 Revised:2018-11-08 Online:2019-03-15 Published:2019-03-15

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Abstract:

In order to increase the catalytic efficiency of advanced wastewater treatment by catalytic ozonation, cobalt aluminate(CoAl2O4)/ceramic honeycomb (CH) catalyst was prepared by a coating method. The influence of coating times, the addition amount of catalyst, calcination time and temperature on the catalytic efficiency was investigated to optimize the preparation conditions. The structure of catalysts were analyzed by X-ray diffractometer, field emission scanning electron microscopy and N2-adsorption and desorption. The catalytic performance and mechanisms were evaluated by catalytic ozonation of hydroquinone. The results show that the catalytic efficiency of CoAl2O4/CH is the highest under the conditions of coating for 6 times, calcination temperature of 700 ℃, calcination time of 6 h and molar ratio of Co to Al of 0.4∶5. The specific surface area and pore volume are the highest and reach 45.47 m2/g and 0.05 cm2/g, respectively. Removal rate of hydroquinone is 84.51% and removal rate of COD is 50.60%. The prepared catalysts belong to the spinal structure and the coating has a sponge-like structure. The catalysts maintain high catalytic activity and stability after repeated use for more than 5 times. Therefore, the application is promising.

Key words: cobalt aluminate/ceramic honeycomb catalyst, catalyst, dye wastewater, catalytic ozonation, wastewater treatment

CLC Number: 

  • TQ426.64

Fig.1

Catalytic ozonation process of hydroquinone wastewater"

Tab.1

Orthogonal experiment table"

水平 A B C D
焙烧
温度/℃		 焙烧
时间/h		 Co与Al
的量比		 涂覆次数
1 500 2 0.2∶5 2
2 600 4 0.4∶5 4
3 700 6 0.6∶5 6

Tab.2

Results of orthogonal experiment for catalyst preparation"

试验号 A B C D COD
去除率/%		 对苯二酚
去除率/%
1# 500 2 0.2∶5 2 38.69 69.74
2# 600 4 0.4∶5 2 41.97 70.90
3# 700 6 0.6∶5 2 50.38 74.76
4# 600 2 0.6∶5 4 44.20 79.75
5# 700 4 0.2∶5 4 48.07 81.87
6# 500 6 0.4∶5 4 52.30 81.64
7# 700 2 0.4∶5 6 51.61 79.12
8# 600 4 0.6∶5 6 49.20 81.53
9# 500 6 0.2∶5 6 50.39 84.63
COD
去除率		 K1 47.13 44.83 45.72 43.68
K2 45.12 46.41 48.63 48.19
K3 50.02 51.02 47.93 50.40
极差 4.90 6.19 2.91 6.72
对苯二酚
去除率		 K1 78.67 76.20 78.75 71.80
K2 77.39 78.10 77.22 81.09
K3 78.58 80.34 78.68 81.76
极差 1.28 4.14 1.53 9.96

Fig.2

Influence of O3 concentration on removal rate of hydroquinone and COD"

Fig.3

Influence of CoAl2O4/CH addition amount on removal rate of hydroquinone and COD"

Fig.4

Effect of pH value on removal rate of hydroquinone (a) and COD (b)"

Fig.5

N2 adsorption/desorption isotherms of 1# catalyst (a) and 9# catalyst (b)"

Fig.6

XRD patterns of 1# and 9# CoAl2O4/CH catalysts"

Fig.7

FESEM images of 1# catalyst (a) and 9# catalyst (b)(×20 000)"

Tab.3

Mechanical properties of different catalysts"

催化剂类型 最大压力/N 抗压强度/MPa
蜂窝陶瓷 4 657 12.50
1#催化剂使用前 6 312 16.49
1#催化剂使用后 6 024 16.17
9#催化剂使用前 5 918 15.89
9#催化剂使用后 5 225 14.11

Fig.8

Effect of recycling utilization times of CoAl2O4/CH catalyst on removal rate of hydroquinone"

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