连文洁,李秋月,黄开波,王锐,唐婷,党志,卢桂宁.黄铁矿活化过硫酸盐降解磷酸三(2-氯乙基)酯的性能及影响因素[J].环境科学学报,2019,39(8):2517-2524
黄铁矿活化过硫酸盐降解磷酸三(2-氯乙基)酯的性能及影响因素
- The performance and influencing factors of pyrite-activated persulfate degradation of tris(2-chloroethyl) phosphate
- 基金项目：国家自然科学基金（No.41573091，41771346）；广东省自然科学杰出青年基金（No.2015A030306005）
- 连文洁
- 华南理工大学环境与能源学院, 广州 510006
- 李秋月
- 华南理工大学环境与能源学院, 广州 510006
- 黄开波
- 华南理工大学环境与能源学院, 广州 510006
- 王锐
- 华南理工大学环境与能源学院, 广州 510006
- 唐婷
- 华南理工大学环境与能源学院, 广州 510006
- 党志
- 1. 华南理工大学环境与能源学院, 广州 510006;2. 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 卢桂宁
- 1. 华南理工大学环境与能源学院, 广州 510006;2. 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 摘要：有机磷酸酯（OPEs）作为一种高效阻燃剂被广泛应用于各种消费品中，并伴随着产品的生产、使用和丢弃等过程而进入环境，且因其具有一定的毒性从而给生态安全带来潜在威胁.本文选择毒性较大的磷酸三（2-氯乙基）酯（TCEP）作为研究对象，利用黄铁矿活化过硫酸盐（FeS2-PS）产生自由基使其降解，并探讨了HCO3-、Cl-、H2PO4-、NO3-和Fe3+、NH4+、Ca2+、Cu2+这8种无机离子和腐殖酸（HA）对TCEP降解的影响.结果表明，黄铁矿活化过硫酸盐能高效降解TCEP，且通过电子顺磁共振波谱仪（EPR）检测发现体系中·OH和SO4·-是TCEP发生降解的主要原因.TCEP在FeS2-PS体系中的降解率随HA浓度的升高而降低.因此，利用4种金属螯合剂环糊精、草酸、柠檬酸钠和乙二胺四乙酸二钠验证得出，Fe2+易与它们络合，导致活性物质减少；无机离子中的Cl-和Fe3+能促进TCEP的降解，而HCO3-和H2PO4-则显著抑制了TCEP的降解.本研究成果可为黄铁矿活化过硫酸盐在实际中的应用提供理论依据.
- Abstract：Organophosphates (OPEs) are one kind of highly effective flame retardants, which are widely applied in a variety of consumer products. It is released to the environment from the processes of production, use and disposal. OPEs pose a potential threat to ecological safety because they were proven to be toxic, persistent and bioaccumulative. In this study, tris(2-chloroethyl) phosphate (TCEP) was selected as the target pollutant, and pyrite activated persulfate system was applied for TCEP degradation. The effects of eight inorganic ions (HCO3-, Cl-, H2PO4-, NO3-, Fe3+, NH4+, Ca2+, Cu2+) and humic acid (HA) on the degradation of TCEP were investigated. The result shows that pyrite-activated persulfate can degrade TCEP efficiently, and we found that·OH and SO4·- are mainly responsible for the degradation of TCEP, which is supported by the result of electron paramagnetic resonance (EPR) spectra. In addition, the degradation rate of TCEP in FeS2-PS system decreases with increasing HA concentration, indicating that Fe2+ was easily complexed with four metal chelators such as β-cyclodextrin, oxalic acid, sodium citrate and edetate disodium, resulting in a decrease in active substances. Besides, the result also indicates that Cl- and Fe3+ can promote the degradation efficiency of TCEP, while HCO3- and H2PO4- are severely inhibited. These results will provide a theoretical basis for the practical application of pyrite-activated persulfate.
