Zhao Yuwei, Cui Jiaxin, Sarrouf Stephanie, Hojabri Shayan, Alshawabkeh Akram N
Department of Civil and Environmental Engineering, Northeastern University, Boston, 02115, MA, USA.
Changjiang Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, Hubei, China.
Res Sq. 2023 Apr 3:rs.3.rs-2608922. doi: 10.21203/rs.3.rs-2608922/v1.
The electrochemical degradation of ibuprofen (IBP) by electro-Fenton process has been studied in a flow-through system by evaluating the performance of two different iron sources, sacrificial cast iron anode and FeSO salt. The effect of operating conditions, including initial IBP concentration, cast iron anode location, initial FeSO concentration, applied current, the split current on the iron anode, solution pH, and flow rate on the efficacy of the process was evaluated. The sequence of the electrodes significantly influences ibuprofen removal. When using cast iron anode as iron source, placing the iron anode upstream achieved the best IBP removal rate. Split current of 3 mA applied on the iron anode out of 120 mA total current is the optimum current for remove 1 mg/L of IBP under a flow rate of 3 mL/min. There is a linear correlation between the applied current and the Fe concentration in the FeSO-system. The initial IBP concentration does not influence the rate of Fenton reaction. Flow rate influences the degradation efficiency as high flow rate dilutes the concentration of OH radicals in the electrolyte. FeSO-system was less affected by the flow rate compared to the iron anode-system as the concentration of the Fe was steady and not diluted by the flow rate. Both systems prefer acidic operation conditions than neutral and alkaline conditions. Iron-anode can be used as an external Fe supply for the treatment for iron-free. These findings contribute in several ways to our understanding of the electro-Fenton process under flow conditions and provide a basis for how to design the reactor for the water treatment.
通过评估两种不同铁源（牺牲铸铁阳极和硫酸亚铁盐）的性能，在流通系统中研究了电芬顿法对布洛芬（IBP）的电化学降解。评估了操作条件（包括初始IBP浓度、铸铁阳极位置、初始硫酸亚铁浓度、施加电流、铁阳极上的分流电流、溶液pH值和流速）对该过程效率的影响。电极顺序对布洛芬的去除有显著影响。当使用铸铁阳极作为铁源时，将铁阳极置于上游可实现最佳的IBP去除率。在总电流120 mA中，铁阳极上施加3 mA的分流电流是在流速为3 mL/min的条件下去除1 mg/L IBP的最佳电流。在硫酸亚铁体系中，施加电流与铁浓度之间存在线性关系。初始IBP浓度不影响芬顿反应速率。流速会影响降解效率，因为高流速会稀释电解液中羟基自由基的浓度。与铁阳极体系相比，硫酸亚铁体系受流速的影响较小，因为铁的浓度稳定，不会被流速稀释。两种体系都更倾向于酸性操作条件而非中性和碱性条件。铁阳极可用作无铁处理的外部铁源。这些发现从几个方面有助于我们理解流动条件下的电芬顿过程，并为如何设计用于水处理的反应器提供了依据。
