rGO-Fe3O4活化过硫酸盐处理酸性红73

doi:10.11949/j.issn.0438-1157.20180918

摘要/Abstract

摘要：

采用共沉淀法制备了还原石墨烯纳米片和磁铁矿复合材料（rGO-Fe₃O₄）。利用X射线衍射（XRD）、X射线光电子能谱（XPS）和透射电镜（TEM）对其进行了表征。以酸性红73（AR73）为目标物，研究了rGO-Fe₃O₄活化过硫酸盐（PS）处理酸性红73的效能，考察了催化剂投加量、PS浓度、溶液初始pH以及反应温度的影响。结果表明，室温下催化剂投加量为1.0 g/L、PS的浓度为1.0 g/L及初始pH为6.9时，10 min内50 mg/L酸性红73的脱色率达到100%。淬灭实验结果表明rGO-Fe₃O₄/PS反应体系同时存在SO₄^-?、?OH和单线态氧¹O₂，其中¹O₂的氧化反应起主导作用。复合材料rGO-Fe₃O₄不但活性高，而且便于分离，应用前景良好。

关键词: 还原石墨烯, 四氧化三铁, 高级氧化, 单线态氧, 过硫酸钠

Abstract:

A reduced graphene oxide nanosheet-iron oxide composite (rGO-Fe₃O₄) was synthesized by using coprecipitation method, and characterized by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The rGO-Fe₃O₄ composite was used as heterogeneous catalyst to activate persulfate (PS) to decolor acid red 73 (AR73). The effects of catalyst dosage, PS concentration, initial pH value and reaction temperature on the decolorization efficiency were investigated. The results showed that 50 mg/L AR73 was totally removed in 10 min at room temperature when the concentrations of rGO-Fe₃O₄ and PS were both 1.0 g/L. Singlet oxygen was confirmed to be the primary reactive oxygen species by quenching experiment. This study shows that the rGO-Fe₃O₄ composite is a promising catalyst for activating PS to treat wastewater due to its high activity and easy separation.

Key words: reduced graphene, magnetite, advanced oxidation processes, singlet oxygen, persulfate

中图分类号:

X 703

尹飞, 王翠, 童少平. rGO-Fe₃O₄活化过硫酸盐处理酸性红73[J]. 化工学报, 2019, 70(1): 207-213.

Fei YIN, Cui WANG, Shaoping TONG. Treatment of acid red 73 by persulfate in the presence of rGO-Fe₃O₄ composite[J]. CIESC Journal, 2019, 70(1): 207-213.

图/表 10

图1 rGO、Fe3O4和rGO-Fe3O4的XRD谱图

Fig.1 XRD pattern of rGO, Fe3O4 and rGO-Fe3O4

图2 rGO-Fe3O4的XPS谱图

Fig.2 XPS spectra of rGO-Fe3O4

图3 rGO-Fe3O4的TEM谱图

Fig.3 TEM image of rGO-Fe3O4

图4 不同体系对AR73的脱色效果

Fig.4 Decolorization efficiency of AR73 under different conditions

表1 与文献同类工作的对比

Table 1 Comparison between this work and relative works

Target pollutant	Concentration	Catalyst	Reaction conditions	Reaction time	Ref.
acid red 73(AR73)	50 mg/L	rGO-Fe₃O₄m(Fe₃O₄):m(rGO)=10:1	catalyst 1.0 g/L; PS 1.0 g/L; pH=6.9	10 min	—
methylene blue	0.05 mmol/L	Fe₃O₄/GO m(Fe₃O₄):m(GO)=1:2	catalyst 0.15 g/L; PS 1.5 mmol/L; pH=6.0	120 min	[19]
trichloroethylene (TCE)	0.15 mmol/L	nFe₃O₄/rGO m(Fe₃O₄):m(rGO)=1:4	catalyst 6.94 g/L; PS 3 mmol/L; pH=6.2	5 min	[20]

图5 不同反应条件对AR73脱色效果的影响

Fig.5 Effect of different reaction conditions on decolorization of AR73

图6 反应温度对脱色效果的影响

Fig.6 Effect of reaction temperature on decolorization of AR73

图7 温度对脱色效果的影响及其动力学特性

Fig.7 Effect of temperature on AR73 decolorization and its kinetics

图8 TOC的去除情况

Fig.8 Removal of TOC at different time

图9 不同淬灭剂对酸性红73脱色效果的影响

Fig.9 Influence of quenching agents on decolorization of AR73

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rGO-Fe₃O₄活化过硫酸盐处理酸性红73

Treatment of acid red 73 by persulfate in the presence of rGO-Fe₃O₄ composite

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