Study on Properties of Potassium Ferrate in Oxidative Degradation of Naphthalene

doi:10.3969/j.issn.1006-396X.2022.03.004

Abstract

Abstract:

In order to investigate the oxidation and degradation effect of potassium on naphthalene,the main factors affecting the degradation rate of naphthalene were determined by single factor experiments,and the degradation conditions of naphthalene were optimized by response surface analysis.The results show that the best degradation condition of potassium ferrate for mass concentratoion of 5.0 mg/L naphthalene are as follows:the temperature is 25 ℃,the pH is 7.0, the dosage of potassium ferrate is 0.60 g/L,and the react time is 30 min.Under the optimum oxidation degradation condition,the rate of naphthalene is 75.60%.The results of single factor experiment show that pH(A),the initial mass concentration of naphthalene(B), and the potassium ferrate dosage(C) are the main factors affecting the degradation rate of naphthalene,and the degree of influence is from big to small C>B>A.The results of multifactor experiment show that the order of interfactors from big to small is AC>AB>BC.The model predicted the optimal degradation conditions of naphthalene by potassium perferrate:the temperature is 25 ℃,the initial mass concentration of naphthalene is 2.79 mg/L and the pH is 6.8,the mass concentration of potassium ferrate is 0.90 g/L,and the reaction time is 30 min.Under the optimum degradation conditions,the highest degradaton rate of naphthalene is 91.82%.

Key words: Potassium ferrate, Naphthalene, Oxidative degradation, Single?factor experiment, Multi?factor experiment, Response surface analysis

摘要：

为探究高铁酸钾对萘的氧化降解效果，通过单因素实验确定影响萘降解率的主要因素，利用响应面分析法对萘的降解条件进行优化。结果表明，高铁酸钾对质量浓度为5.0 mg/L萘的最佳降解条件：温度为25 ℃，pH为7.0，高铁酸钾质量浓度为0.60 g/L，反应时间为30 min；在最佳氧化降解条件下，萘的降解率为75.60%。单因素实验结果表明，pH（A）、萘初始质量浓度（B）和高铁酸钾质量浓度（C）是影响萘降解率的主要因素，影响程度从大到小的顺序为C>B>A。多因素实验结果表明，相互因素的影响程度从大到小的顺序为AC>AB>BC。模型预测高铁酸钾对萘的最佳降解条件：温度为25 ℃，萘初始质量浓度为2.79 mg/L，pH为6.8，高铁酸钾质量浓度为0.90 g/L，反应时间为30 min；在最佳降解条件下，萘降解率最高为91.82%。

关键词: 高铁酸钾, 萘, 氧化降解, 单因素实验, 多因素实验, 响应面分析

CLC Number:

TQ013.7

Jiaqi Han, Shuang Li, Huiqiang Ma. Study on Properties of Potassium Ferrate in Oxidative Degradation of Naphthalene[J]. Journal of Petrochemical Universities, 2022, 35(3): 23-29.

韩佳琪, 李爽, 马会强. 高铁酸钾氧化降解萘的性能研究[J]. 石油化工高等学校学报, 2022, 35(3): 23-29.

Figures/Tables 10

Table 1 The experimental factor level table of the response surface

水平	pH	$ρ$ （初始萘）/(mg $⋅$ L^-1)	ρ（K₂FeO₄）/(g $⋅$ L^-1)
-1	4.0	2.5	0.45
0	6.0	5.0	0.68
1	8.0	7.5	0.90

Table 1 The experimental factor level table of the response surface

水平	pH	$ρ$ （初始萘）/(mg $⋅$ L^-1)	ρ（K₂FeO₄）/(g $⋅$ L^-1)
-1	4.0	2.5	0.45
0	6.0	5.0	0.68
1	8.0	7.5	0.90

Fig.1 Effect of K2FeO4 mass concentration on the degradation rate of naphthalene

Fig.2 The effect of pH on the degradation rate of naphthalene

Fig.3 Effect of temperature on the degradation rate of naphthalene

Fig.4 Effect of initial mass concentration of naphthalene on the degradation rate of naphthalene

Table 2 Response surface experimental results

序号	A	B	C	萘降解率/%		序号	A	B	C	萘降解率/%
序号	A	B	C	实测值	预测值	序号	A	B	C	实测值	预测值
1	4.0	5.0	0.90	68.23	68.15	10	6.0	7.5	0.45	51.47	50.82
2	4.0	2.5	0.68	69.52	68.95	11	6.0	7.5	0.90	75.35	74.65
3	4.0	5.0	0.45	53.02	52.89	12	6.0	2.5	0.45	63.54	64.24
4	4.0	7.5	0.68	47.33	48.11	13	6.0	5.0	0.68	72.02	71.87
5	6.0	2.5	0.90	91.68	92.33	14	8.0	5.0	0.90	82.37	82.50
6	6.0	5.0	0.68	72.58	72.41	15	8.0	7.5	0.68	56.49	56.08
7	6.0	5.0	0.68	71.53	71.74	16	8.0	5.0	0.45	45.78	45.86
8	6.0	5.0	0.68	71.42	71.58	17	8.0	2.5	0.68	68.09	67.31
9	6.0	5.0	0.68	71.14	71.06

Table 3 Response surface model analysis of variance

来源	平方和	自由度	均方	影响程度（F）	拟合程度（P）	显著程度
模型	2 425.63	9	269.51	376.25	<0.000 1	高度显著
A	26.75	1	26.75	37.35	0.000 5	显著
B	483.45	1	483.45	674.92	<0.000 1	高度显著
C	1 347.32	1	1 347.32	1 880.93	<0.000 1	高度显著
AB	28.04	1	28.04	39.14	0.000 4	显著
AC	114.28	1	114.28	159.53	<0.000 1	高度显著
BC	4.54	1	4.54	6.33	0.040 0	显著
A²	401.93	1	401.93	561.11	<0.000 1	高度显著
B²	10.92	1	10.92	15.24	0.005 9	显著
C²	0.62	1	0.62	0.86	0.384 9	不显著
残差	5.01	7	0.72	3.85
失拟项	3.72	3	1.24	376.25	0.113 0	不显著
纯误差	1.29	4	0.32
总和	2 430.64	16

Fig.5 Effect of initial naphthalene mass concentration and pH interaction on naphthalene degradation rate

Fig.6 Effect of potassium ferrate dosage and pH interaction on naphthalene degradation rate

Fig.7 Effect of potassium ferrate dosage and initial concentration of naphthalene on the degradation rate of naphthalene

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