Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, 701, Taiwan; Department of Chemical and Materials Engineering, Tunghai University, Taichung, 407, Taiwan.
Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, 701, Taiwan.
Environ Pollut. 2023 Oct 15;335:122246. doi: 10.1016/j.envpol.2023.122246. Epub 2023 Jul 27.
The Fenton-like reaction is a promising organic wastewater treatment reaction among advanced oxidation processes (AOP), which has emerged to replace the conventional Fenton reaction. Recycled construction and demolition waste (CDW), which is porous and rich in iron, manganese, and magnesium, can be reused as a Fenton-like catalyst. This study proposes an AOP wastewater treatment strategy using recycled porous CDW mixed with hydrogen peroxide (HO) to decompose methylene blue (MB) wastewater. According to the apparent first-order rate (K) of 10 ppm MB adsorption, CDW-3, having the highest specific surface area, also has the highest K of 0.23 min g. The optimized conditions recommended by the Taguchi method include a 0.3 g mL CDW-3 concentration, a 0.254 g mL HO concentration, and 10 ppm MB, resulting in an about 2.01 minK value. In addition, MB concentration is observed as the most influential factor for K, which decreases with increasing MB concentration and is about 0.62 min at 1000 ppm MB. Repeating the Fenton-like reaction five times at 100 p.m. MB using the same CDW-3, the K is about 0.64 min, which is 86% of the initial run. The synergistic effect index (ξ) is defined to quantify the level of interaction between CDW and HO, which produces free radicals during the Fenton-like process. The ξ of CDW-3 is about 2.16. Overall, it is demonstrated that CDW is a promising catalyst for Fenton-like reactions, and the synergistic effect index (ξ) can be used as a reference index to evaluate the catalytic generation of free radicals between the catalyst and HO.
芬顿类反应是高级氧化工艺（AOP）中一种很有前途的有机废水处理反应，它的出现取代了传统的芬顿反应。再生的建筑和拆除废物（CDW）多孔且富含铁、锰和镁，可以被重新用作芬顿类催化剂。本研究提出了一种使用再生多孔 CDW 与过氧化氢（HO）混合分解亚甲基蓝（MB）废水的 AOP 废水处理策略。根据 10 ppm MB 吸附的表观一级速率（K），比表面积最高的 CDW-3 的 K 值也最高，为 0.23 min g。田口法推荐的最佳条件包括 0.3 g mL CDW-3 浓度、0.254 g mL HO 浓度和 10 ppm MB，得到的约 2.01 min K 值。此外，MB 浓度被观察为对 K 最具影响力的因素，随着 MB 浓度的增加而降低，在 1000 ppm MB 时约为 0.62 min。使用相同的 CDW-3，在 100 p.m. MB 下重复五次芬顿类反应，K 值约为 0.64 min，为初始运行的 86%。协同效应指数（ξ）用于量化 CDW 和 HO 之间相互作用的程度，在芬顿类过程中会产生自由基。CDW-3 的 ξ 约为 2.16。总体而言，证明 CDW 是一种很有前途的芬顿类反应催化剂，协同效应指数（ξ）可用作评估催化剂和 HO 之间自由基生成的协同作用的参考指数。
