Elimination of bisphenol A with visible light-enhanced peroxydisulfate activation process mediated by Fe 3+ -nitrilotriacetic acid complex.

In recent years, visible light assisted advanced oxidation processes (AOPs) are appealing in the elimination of pollutants. Herein, an innovative and eco-friendly visible light enhanced Fe ³⁺ -nitrilotriacetic acid system for the activation of peroxydisulfate (Vis/Fe ³⁺ -NTA/PDS) was proposed for the removal of bisphenol A (BPA). Fe ³⁺ -NTA could be dissociated through ligand-to-metal charge transfer (LMCT) to realize the generation of Fe ²⁺ for the continuous activation of PDS to remove BPA. The use of 0.10 mM Fe ³⁺ , 0.10 mM NTA and 1.00 mM PDS led to 97.5% decay of 0.05 mM BPA and 66.3% of TOC removal in 30 min with the illumination of visible light at initial pH 3.0. The sulfate and hydroxyl radicals were proved to be the dominant species leading to BPA removal by means of radical scavenging experiments, radical probes and electron paramagnetic resonance (EPR) technique. The effects of various operating parameters, natural water constituents as well as different water matrices on BPA abatement were explored. The intermediate products of BPA degradation were identified and a possible transformation pathway was proposed. Briefly, this research provides an attractive strategy for the remediation of refractory wastewater using NTA assisted with visible light in the homogeneous Fe ³⁺ /PDS system.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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