Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran; Student Research Committee, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran; Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran.
J Environ Manage. 2023 Apr 15;332:117295. doi: 10.1016/j.jenvman.2023.117295. Epub 2023 Feb 2.
The 2,4-dichlorophenol (2,4-DCP) is an important chemical precursor that can affect human endocrine system and induce pathological symptoms. This research reports the degradation of 2,4-DCP using lab-scale hydrodynamic cavitation (HC) approach, which is considered a green and effective method. To promote the degradation efficiency, the zero-valent iron (Fe) as the catalyst for sulfate radical (SO) generation via activation of sulfite (SO) salts was simultaneously used. Degradation efficiency was favorable in acidic pH than the alkaline pH due to higher production of active radicals and was dependent on the dose of Fe and SO. Under optimal condition, degradation efficiency by Fe/HC/sulfite (96.67 ± 2.90%) was considerably enhanced compared to HC alone (45.37 ± 2.26%). Quenching experiments suggested that SO, OH, O, and O radicals were involved in the degradation of 2,4-DCP by Fe/HC/sulfite process, but the dominant role was related to OH (70.09% contribution) and SO (29.91% contribution) radicals. From the turbulence model, turbulent pressure at venturi throat decreased from -0.42 MPa to -2.02 MPa by increasing the inlet pressure from 1.0 to 4.0 bar and increase in pressure gradient has intensified bubble collapse due to higher turbulence tension.
2,4-二氯苯酚（2,4-DCP）是一种重要的化学前体物质，可影响人体内分泌系统并引发病理症状。本研究采用实验室规模的水力空化（HC）方法降解 2,4-DCP，这被认为是一种绿色有效的方法。为了提高降解效率，同时使用零价铁（Fe）作为催化剂，通过激活亚硫酸盐（SO）盐来生成硫酸根自由基（SO）。由于活性自由基的生成更高，因此在酸性 pH 下的降解效率优于碱性 pH，并且取决于 Fe 和 SO 的剂量。在最佳条件下，Fe/HC/亚硫酸盐（96.67±2.90%）的降解效率明显高于单独的 HC（45.37±2.26%）。猝灭实验表明，SO、OH、O 和 O 自由基都参与了 Fe/HC/亚硫酸盐过程中 2,4-DCP 的降解，但主要作用与 OH（70.09%的贡献）和 SO（29.91%的贡献）自由基有关。从湍流模型来看，通过将入口压力从 1.0 增加到 4.0 巴，文丘里喉管处的湍流动压从-0.42 MPa 降低到-2.02 MPa，并且由于更高的湍流张力，压力梯度的增加加剧了气泡的崩溃。
