Efficient degradation of naproxen by persulfate activated with zero-valent iron: performance, kinetic and degradation pathways

作者：Shuyu Dong, Xiaoxue Zhai, Ruobing Pi, Jinbao Wei, Yunpeng Wang, Xuhui Sun · 发表于：Water Science & Technology · 年份：2020 · DOI：10.2166/wst.2020.263 · 被引用次数：13 · 研究领域：Advanced oxidation water treatment、Environmental remediation with nanomaterials、Pharmaceutical and Antibiotic Environmental Impacts

Abstract Degradation of naproxen (NAP) by persulfate (PS) activated with zero-valent iron (ZVI) was investigated in our study. The NAP in aqueous solution was degraded effectively by the ZVI/PS system and the degradation exhibited a pseudo-first-order kinetics pattern. Both sulfate radical (SO4•−) and hydroxyl radical (HO•) participate in the NAP degradation. The second-order rate constants for NAP reacting with SO4•− and HO• were (5.64 ± 0.73) × 109 M−1 s−1 and (9.05 ± 0.51) × 109 M−1 s−1, respectively. Influence of key parameters (initial pH, PS dosage, ZVI dosage, and NAP dosage) on NAP degradation were evaluated systematically. Based on the detected intermediates, the pathways of NAP degradation in ZVI/PS system was proposed. It was found that the presence of ammonia accelerated the corrosion of ZVI and thus promoted the release of Fe2+, which induced the increased generation of sulfate radicals from PS and promoted the degradation of NAP. Compared to its counterpart without ammonia, the degradation rates of NAP by ZVI/PS were increased to 3.6–17.5 folds and 1.2–2.2 folds under pH 7 and pH 9, respectively.