Preparation and electro oxidation performance of MnO2‒RuO2/ CFS composite electrode

doi:10.19965/j.cnki.iwt.2021-0680

Abstract

Abstract:

MnO₂?RuO₂/CFS（carbon fiber cloth）composite electrode was prepared by electrodeposition. The prepared electrode was characterized by SEM， XRD and cyclic voltammetry， and the electrochemical oxidation performance and its influencing factors of the electrode were investigated by degrading methylene blue simulated wastewater containing high concentration of chloride. The results showed that dense and rough MnO₂ and RuO₂ nanocrystals were distributed on MnO₂?RuO₂/CFS composite electrode，which could improve the utilization of chloride ions and degradation efficiency. Compared with pure carbon fiber cloth and RuO₂/CFS electrode， MnO₂?RuO₂/CFS composite electrode had stronger electrochemical oxidation ability and higher decolorization rate and COD removal rate for the degradation of methylene blue. The optimum conditions by SPSS for the treatment of methylene blue wastewater with MnO₂?RuO₂/CFS composite electrode were as follows：the initial mass concentration of methylene blue 550 mg/L，the mass concentration of NaCl 20 g/L，the current density 90 mA/cm²，and the electrolysis time 60 min. Under these conditions，the COD removal rate reached 95.90%，and the degradation reaction was accorded with the first-order reaction kinetics.

Key words: MnO₂?RuO₂/CFS composite electrode, electrochemical oxidation, methylene blue

摘要：

采用电沉积法制备MnO₂?RuO₂/CFS（碳纤维布）复合电极，利用SEM、XRD、循环伏安测试等对制备的电极进行了表征，并通过降解高氯亚甲基蓝模拟废水实验，考察了制备电极的电化学氧化性能及影响因素。结果表明：MnO₂?RuO₂/CFS复合电极上分布着密集粗糙的MnO₂和RuO₂纳米晶体，可提高氯离子利用率和降解效率；与纯碳纤维布、RuO₂/CFS电极相比，MnO₂?RuO₂/CFS复合电极的电化学氧化能力更强，降解亚甲基蓝具有更高的脱色率和COD去除率。通过SPSS优化可以得到MnO₂?RuO₂/CFS复合电极处理亚甲基蓝废水的最佳条件：初始亚甲基蓝质量浓度550 mg/L，NaCl质量浓度20 g/L，电流密度90 mA/cm²，电解时间60 min，在此条件下，COD去除率达到95.90%。降解反应符合一级反应动力学。

关键词: MnO₂?RuO₂/CFS复合电极, 电化学氧化, 亚甲基蓝

CLC Number:

TQ151.4

Weitao MA,Zaixing LI,Xiaofei CHEN,Yanfang LIU,Yihan LEI,Pengfei HOU. Preparation and electro oxidation performance of MnO₂‒RuO₂/ CFS composite electrode[J]. Industrial Water Treatment, 2022, 42(3): 98-105.

马伟涛,李再兴,陈晓飞,刘艳芳,雷诣涵,侯鹏飞. MnO₂‒RuO₂/CFS复合电极制备及其电氧化性能研究[J]. 工业水处理, 2022, 42(3): 98-105.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0680

https://www.iwt.cn/EN/Y2022/V42/I3/98

Figures/Tables 14

References 18

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编号	A	B	C	D	COD去除率/%	脱色率/%
1	350	15	80	15	-65.22	95.79
2	550	25	80	45	75.78	97.05
3	650	30	80	60	90.76	92.92
4	450	20	80	30	65.21	92.06
5	450	30	100	15	-67.71	88.83
6	650	25	90	15	-62.05	92.07
7	550	20	110	15	-38.21	97.93
8	350	30	110	45	45.54	96.53
9	650	15	110	30	27.39	98.04
10	350	25	100	30	-4.06	93.15
11	450	25	110	60	78.23	96.91
12	450	15	90	45	53.02	97.33
13	550	15	100	60	95.90	97.21
14	550	30	90	30	34.64	97.46
15	650	20	100	45	70.30	97.84
16	350	20	90	60	93.22	94.38

编号	A	B	C	D	COD去除率/%	脱色率/%
1	350	15	80	15	-65.22	95.79
2	550	25	80	45	75.78	97.05
3	650	30	80	60	90.76	92.92
4	450	20	80	30	65.21	92.06
5	450	30	100	15	-67.71	88.83
6	650	25	90	15	-62.05	92.07
7	550	20	110	15	-38.21	97.93
8	350	30	110	45	45.54	96.53
9	650	15	110	30	27.39	98.04
10	350	25	100	30	-4.06	93.15
11	450	25	110	60	78.23	96.91
12	450	15	90	45	53.02	97.33
13	550	15	100	60	95.90	97.21
14	550	30	90	30	34.64	97.46
15	650	20	100	45	70.30	97.84
16	350	20	90	60	93.22	94.38

指标	方差来源	平方和	自由度	均方和	F值
亚甲基蓝脱色率	A	0.003	3	0.001	1.670
	B	0.002	3	0.001	1.314
	C	0.002	3	0.001	1.460
	D	0.003	3	0.001	1.528
	误差E	0.002	3	0.001
COD 去除率	A	0.209	3	0.070	5.087
	B	0.274	3	0.091	6.380
	C	0.139	3	0.046	2.968
	D	2.281	3	0.760	201.944
	误差E	0.130	3	0.043

指标	方差来源	平方和	自由度	均方和	F值
亚甲基蓝脱色率	A	0.003	3	0.001	1.670
	B	0.002	3	0.001	1.314
	C	0.002	3	0.001	1.460
	D	0.003	3	0.001	1.528
	误差E	0.002	3	0.001
COD 去除率	A	0.209	3	0.070	5.087
	B	0.274	3	0.091	6.380
	C	0.139	3	0.046	2.968
	D	2.281	3	0.760	201.944
	误差E	0.130	3	0.043

考核指标		A	B	C	D
COD 去除率	K₁	0.694 9	1.111 0	0.504 6	-2.33
	K₂	1.287 5	1.905 2	1.188 4	1.231 8
	K₃	1.681 1	0.879 1	0.944 3	2.446 4
	K₄	1.264 0	1.032 3	1.129 5	3.581 2
	k₁	0.173 7	0.277 7	0.126 2	-0.583 0
	k₂	0.321 9	0.476 3	0.297 1	0.308 0
	k₃	0.420 3	0.219 8	0.236 1	0.611 6
	k₄	0.316 0	0.258 1	0.282 4	0.895 3
	R	0.246 5	0.256 5	0.170 9	1.478 3

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Preparation and electro oxidation performance of MnO₂‒RuO₂/ CFS composite electrode

MnO₂‒RuO₂/CFS复合电极制备及其电氧化性能研究

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水平	因素
水平	A 亚甲基蓝初始质量浓度/（mg·L^-1）	B NaCl质量浓度/（g·L^-1）	C 电流密度/（mA·cm^-2）	D 电解时间/min
1	350	15	80	15
2	450	20	90	30
3	550	25	100	45
4	650	30	110	60

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