Degradation of OrangeⅡby PMS activated with magnetic biochar

doi:10.19965/j.cnki.iwt.2021-0622

Abstract

Abstract:

Magnetic biochar was prepared by precipitation method and characterized by SEM，XRD，FTIR and BET. The degradation of OrangeⅡby PMS activated by MBC was studied. The effects of OrangeⅡ concentration，PMS concentration，MBC dosage，initial solution pH and temperature on degradation effect were investigated. Results showed that under conditions such as initial solution pH 7，0.3 g/L MBC，0.4 g/L PMS，the degradation efficiency of 20 g/L OrangeⅡcould reach 98.4% within 90 min at 25 ℃. The degradation efficiency increased with MBC dosage，initial solution pH and temperature. Cl^-，HCO₃^-，NO₃^- and HA had negative effect on the degradation. Quenching experiments revealed that the main oxidant species in the MBC/PMS system were ¹O₂ and ?OH. After 4 runs，the degradation efficiency of OrangeⅡ could reach 39.1%.

Key words: magnetic biochar, peroxymonosulfate, OrangeⅡ

摘要：

利用沉淀法制备了磁性生物炭（MBC），采用扫描电镜（SEM）、X射线衍射仪（XRD）、傅立叶红外光谱仪（FTIR）和比表面积分析仪（BET）对制备的MBC进行了表征，并用其催化过一硫酸盐（PMS）降解水中橙黄Ⅱ，考察了初始橙黄Ⅱ浓度、PMS浓度、MBC投加量、溶液初始pH和温度对降解效果的影响。结果表明，当初始橙黄Ⅱ质量浓度为20 mg/L，溶液初始pH为7，温度为25 ℃，MBC投加量为0.3 g/L，PMS质量浓度为0.4 g/L时，反应90 min后橙黄Ⅱ降解率可达98.4%。橙黄Ⅱ的降解率随MBC投加量、溶液初始pH和温度的升高而提高。Cl^-、HA、HCO₃^-和NO₃^-对降解效果有一定的抑制。自由基猝灭实验结果表明，MBC/PMS体系中的主要氧化物种为¹O₂和?OH。MBC经过4次循环使用后，橙黄Ⅱ降解率仍可达到39.1%。

关键词: 磁性生物炭, 过一硫酸盐, 橙黄Ⅱ

CLC Number:

X703

Dandan WU,Xiaobin SHEN,Yanying RAO,Xiaodan HUANG. Degradation of OrangeⅡby PMS activated with magnetic biochar[J]. Industrial Water Treatment, 2022, 42(3): 54-61.

吴丹丹,沈晓彬,饶艳英,黄晓丹. 磁性生物炭催化过一硫酸盐降解橙黄Ⅱ[J]. 工业水处理, 2022, 42(3): 54-61.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0622

https://www.iwt.cn/EN/Y2022/V42/I3/54

Figures/Tables 15

Fig. 1 SEM characterization results of BC （upper right small figure） and MBC

Fig. 2 XRD characterization results of BC and MBC

Fig. 3 FTIR characterization results of BC and MBC

Fig. 4 N₂ sorption isotherm and pore distribution of MBC

Fig. 5 Treatment effects of different systems

Fig. 6 Effect of MBC dosage

Fig. 7 Effect of PMS concentration

Fig. 8 Effect of the concentration of orangeⅡ

Fig. 9 Effect of the initial solution pH

Fig. 10 Effect of temperature

Fig. 11 Effect of water composition

Fig. 12 Experimental results of free radical quenching

Fig. 13 Changes of UV-Vis spectra during degradation of orangeⅡsolution

Fig. 14 Result of recycle experiments

Fig. 15 Degradation effect of MBC/PMS system on different dyes

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