Efficient removal of bisphenol A with activation of peroxydisulfate via electrochemically assisted Fe(III)-nitrilotriacetic acid system under neutral condition
Efficient removal of bisphenol A with activation of peroxydisulfate via electrochemically assisted Fe(III)-nitrilotriacetic acid system under neutral condition
复制标题
中性条件下电化学辅助Fe(III)-次氮基三乙酸体系活化过二硫酸盐高效去除双酚A
DOI：
10.1016/j.jhazmat.2020.123874
复制
发表时间：
2021
影响因子：
13.6
通讯作者：
Zhang Hui
中科院分区：
文献类型：
--
作者：
Xiong Liangliang;Ren Wei;Lin Heng;Zhang Hui
在这项工作中，提出了一种用于活化过二硫酸盐的创新电化学辅助 Fe(III)-次氮基三乙酸系统（电/Fe(III)-NTA/PDS），用于在中性 pH 下使用商用石墨电极去除双酚 A (BPA)。 BPA的有效衰减主要源于阴极Fe(III)-NTA复合物还原的Fe(II)对PDS的持续激活。清除剂实验和电子顺磁共振 (EPR) 测量证实，BPA 的去除是通过石墨吸附、直接电子转移 (DET) 和自由基氧化发生的。硫酸根和羟基自由基是 BPA 氧化的主要原因，而石墨吸附和 DET 在 BPA 去除中起次要作用。探讨了 Fe(III) 浓度、PDS 用量、输入电流、NTA 与 Fe(III) 摩尔比以及共存无机阴离子（Cl−、NO3−、H2PO4− 和 HCO3−）对 BPA 消除的影响。在初始pH 7.0、0.30 mM Fe(III)、0.15 mM NTA、5 mM PDS、5 mA恒流条件下，Electro/Fe(III)-NTA/PDS体系反应60 min后，BPA去除率达到93.5%。总体而言，这项研究为在均相 Fe(III)/过硫酸盐系统中使用 NTA 与电化学相结合来修复有机废水提供了新的视角和潜力。
In this work, an innovative electrochemically assisted Fe(III)-nitrilotriacetic acid system for the activation of peroxydisulfate (electro/Fe(III)-NTA/PDS) was proposed for the removal of bisphenol A (BPA) at neutral pH with commercial graphite electrodes. The efficient BPA decay was mainly originated from the continuous activation of PDS by Fe(II) reduced from Fe(III)-NTA complexes at the cathode. Scavenger experiments and electron paramagnetic resonance (EPR) measurements confirmed that the removal of BPA occurred through graphite adsorption, direct electron transfer (DET) and radical oxidation. Sulfate and hydroxyl radicals were primarily responsible for the oxidation of BPA while graphite adsorption and DET played a minor role in BPA removal. The influence of Fe(III) concentration, PDS dosage, input current, NTA to Fe(III) molar ratio as well as coexisting inorganic anions (Cl−, NO3−, H2PO4−and HCO3−) on BPA elimination was explored. The BPA removal efficiency reached 93.5 % after 60 min reaction in the electro/Fe(III)-NTA/PDS system under the conditions of initial pH 7.0, 0.30 mM Fe(III), 0.15 mM NTA, 5 mM PDS and 5 mA constant current. Overall, this research provided a novel perspective and potential for remediation of organic wastewater using NTA in combination with electrochemistry in the homogeneous Fe(III)/persulfate system.