FeS催化过一硫酸盐处理含SDS水溶液中的三氯乙烯

doi:10.19965/j.cnki.iwt.2024-0585

摘要/Abstract

摘要：

采用硫化亚铁（FeS）催化过一硫酸盐（PMS）降解含十二烷基硫酸钠（SDS）水溶液中的三氯乙烯（TCE），优化了PMS/FeS体系中药剂投加量以提高TCE降解效率，考察了SDS浓度对去除TCE的影响，探究了反应过程中各类活性氧物种对TCE降解的贡献度，确定了主导自由基，考察了溶液水质条件等因素对TCE降解的影响，验证了PMS/FeS体系对含SDS的模拟实际地下水中TCE的降解效果。结果表明：在一定范围内增加PMS或FeS投加量均有利于TCE降解，当PMS初始浓度为0.8 mmol/L，FeS初始质量浓度为0.8 g/L时，1 h内TCE降解率达90.2%，但其降解率随着SDS浓度的增加而略有下降。自由基清扫实验和电子顺磁共振检测结果表明，·OH、SO₄ ^·-和O₂ ^·-均参与了TCE降解，其中SO₄ ^·-作用最显著。在溶液初始pH为3.0~9.0的范围内，TCE降解率均达90%以上，Cl^-和HCO₃ ^-的存在均会抑制TCE降解，且HCO₃ ^-抑制作用更明显。实际地下水的复杂水质条件对TCE降解有一定的负面影响，但通过预先调节地下水pH至4.0能有效提高TCE去除率，证明了该技术在实际应用中具有可行性。

关键词: 三氯乙烯, 十二烷基硫酸钠, 过一硫酸盐, 硫化亚铁, 地下水修复

Abstract:

Ferrous sulfide(FeS) was employed to activate peroxymonosulfate(PMS) for trichloroethylene(TCE) degradation in aqueous solution containing sodium dodecyl sulfate(SDS). The dosage of the agents in the PMS/FeS system was optimized to improve the degradation efficiency of TCE. The effect of SDS concentration on the removal of TCE was investigated. The contribution of various reactive oxygen species to the degradation of TCE during the reaction was explored, and the dominant free radicals were determined. The effects of water quality conditions on the degradation of TCE were investigated. The degradation performance of PMS/FeS system on TCE in simulated actual groundwater containing SDS was verified. The experimental results showed that increasing the dosage of PMS or FeS in a certain range was favorable to TCE removal and TCE degradation reached 90.2% when the dosages of PMS and FeS were set as 0.8 mmol/L and 0.8 g/L, respectively. The degradation of TCE decreased slightly with the increase of SDS. ROS scavenging tests and electron paramagnetic resonance(EPR) analysis confirmed that all ·OH, SO₄ ^·-, and O₂ ^·- were involved in the TCE degradation with SO₄ ^·- playing the more important role. More than 90% of TCE could be removed in the initial solution pH range from 3.0 to 9.0. Both Cl^- and HCO₃ ^- had an inhibition effect on TCE degradation and HCO₃ ^- displaying more significant. Finally, the complex of the actual groundwater matrixes had a negative influence on TCE degradation,but the removal of TCE could be effectively improved by pre-adjusting the pH of the actual groundwater to 4.0, thus demonstrating the feasibility of this process for practical application.

Key words: trichloroethylene, sodium dodecyl sulfate, peroxymonosulfate, ferrous sulfide, groundwater remediation

中图分类号:

X703.1

赵泫然, 曹恩伟, 刘璐琦, 吕树光. FeS催化过一硫酸盐处理含SDS水溶液中的三氯乙烯[J]. 工业水处理, 2025, 45(8): 113-120.

Xuanran ZHAO, Enwei CAO, Luqi LIU, Shuguang LÜ. Degradation of trichloroethylene in sodium dodecyl sulfate aqueous solutions by FeS-activated peroxymonosulfate process[J]. Industrial Water Treatment, 2025, 45(8): 113-120.

https://www.iwt.cn/CN/Y2025/V45/I8/113

图/表 13

图1 TCE在不同体系中降解效果的比较

Fig.1 Comparison of TCE degradation performance in different systems

图2 PMS/FeS体系中溶解性Fe（Ⅱ）及总铁浓度的变化

Fig.2 Changes of the dissolved Fe（Ⅱ） and total Fe concentration in PMS/FeS system

图3 PMS/FeS和PMS/Fe（Ⅱ）体系中PMS分解率

Fig.3 PMS decomposition in PMS/FeS and PMS/Fe（Ⅱ） systems

图4 PMS投加量对TCE降解效果的影响

Fig.4 Effect of PMS dosage on TCE degradation performance

图5 FeS投加量对TCE降解效果的影响

Fig.5 Effect of FeS dosage on TCE degradation performance

图6 SDS浓度对TCE降解效果的影响

Fig.6 Effect of SDS concentration on TCE degradation performance

图7 PMS/FeS体系中EPR检测谱图

Fig.7 EPR spectrum in PMS/FeS system

图8 自由基清扫剂对TCE降解效果的影响

Fig.8 Effect of radical scavengers on TCE degradation performance

图9 溶液初始pH对TCE降解效果的影响

Fig.9 Effect of initial solution pH on TCE degradation performance

表1 不同溶液初始pH条件下TCE降解率及反应后pH变化

Table 1 TCE degradation and changes of solution pH after reaction under different initial solution pH

实验条件	反应后溶液pH	TCE降解率/%
pH=3.0	2.86	92.2
pH=5.0	2.83	91.4
pH=7.0	2.99	92.5
pH=9.0	3.01	91.2
pH=11.0	2.92	79.8

图10 无机阴离子Cl^-和HCO₃ ^-对TCE降解的影响

Fig.10 Effect of inorganic ions Cl^- and HCO₃ ^- on TCE degradation

表2 实际地下水参数

Table 2 Parameters of the actual groundwater

参数	pH	TOC	Cl^-	CO₃ ^2-	NO₃ ^-	SO₄ ^2-	Ca²⁺	Mg²⁺	Mn²⁺
数值	7.72	34.63	127	86.82	1.14	60.72	59	63	<0.01

图11 实际地下水中TCE去除效果

Fig.11 TCE degradation performance in actual groundwater

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