Novel column reactor design for simultaneous photocatalysis and adsorption of 1-naphthol by FeOOH/peroxymonosulfate: Modelling the kinetics and concentration gradient

化学 催化作用 吸附 单线态氧 光催化 动力学 氧气 光化学 有机化学 量子力学 物理
作者
Hiu Lam So,Wei Chu
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:451: 138598-138598 被引量:6
标识
DOI:10.1016/j.cej.2022.138598
摘要

This study demonstrated a simultaneous photocatalysis and adsorption of 1-naphthol by peroxymonosulfate (PMS), FeOOH and UV-C in a novel column reactor, which is composed of a submerged UV-C lamp, mixed quartz bead-FeOOH media bed and a continuous supply of oxidant. Around 80 % of 1-naphthol was removed at its optimal condition. The reaction mechanism was found to be pH dependent. At lower pH, photocatalysis and adsorption are favored as the catalyst surface is protonated (≡FeOH2+) to promote PMS activation and 1-naphthol adsorption, and the dissolution of Fe3+ enhanced homogeneous activation of PMS. At pH level higher than 8, the reaction becomes retarded due to the deprotonation of catalyst surface and dissociation of 1-naphthol into its conjugate base. Superoxide radical (O2•-), singlet oxygen (1O2) and sulfate radical (SO4•-) were confirmed to contribute to 1-naphthol oxidation. The reactor design was optimized at 20 min retention time. Due to the regeneration of FeIII/FeII sites on FeOOH, the performance of reused catalyst is maintained at 90 % after 5 cycles of reuse. A quadratic regression with R2 = 0.929 was used to model the concentration gradient of 1-naphthol along the column at different time intervals.
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