Samdan Canan, Bozkurt Tugce
Faculty of Engineering and Architecture, Department of Chemical Engineering, Eskisehir Osmangazi University, 26480, Eskişehir, Turkey.
Environ Sci Pollut Res Int. 2023 Apr;30(16):47311-47327. doi: 10.1007/s11356-023-25552-1. Epub 2023 Feb 4.
This study investigated Ni removal performance in 3DER reactors where electrocoagulation mechanisms and microelectrodes are used together. EDTA modification was carried out on the granule-activated carbon surface to increase the efficiency and affinity of microelectrodes against Ni molecules. The grafting was examined using BET, FT-IR, SEM, EDS, and the elemental mapping methods. With the surface analyses made in this study, it was revealed that EDTA modification on granulated activated carbon was successfully performed. Also, 8.48%wt by mass of EDTA grafting on granular activated carbon was possible. EDTA functionalization did not affect the surface pore structures of CAC much. Under 10 V potential, 97.82% Ni removal efficiency was obtained with 2D in 35 min, while 96.69% removal in 10 min and 100% removal in 15 min were obtained in the 3D reactor. The Ni removal mechanism in 3DER reactors has been determined to conform to the pseudo-second-order kinetic model. The k value obtained for 10 V (1.36 10) is 27 times the k value obtained for 5 V for 3DER reactors. In addition, using central composite design (CCD), operational parameters such as time, concentration, and potential difference affecting Ni removal in 3DER reactors have been optimized. The most influential parameter is the applied voltage, followed by time and concentration. It has been determined that 3DER reactors using EDTA-modified microelectrodes are highly efficient and suitable for Ni removal.
本研究调查了在同时使用电凝聚机制和微电极的三维电极反应器中镍的去除性能。对颗粒活性炭表面进行了乙二胺四乙酸（EDTA）改性，以提高微电极对镍分子的效率和亲和力。使用比表面积分析仪（BET）、傅里叶变换红外光谱仪（FT-IR）、扫描电子显微镜（SEM）、能谱仪（EDS）和元素映射方法对接枝情况进行了检测。通过本研究进行的表面分析，结果表明在颗粒活性炭上成功进行了EDTA改性。此外，在颗粒活性炭上实现了质量分数为8.48%的EDTA接枝。EDTA功能化对颗粒活性炭（CAC）的表面孔结构影响不大。在10V电位下，二维反应器在35分钟内镍去除效率达到97.82%，而三维反应器在10分钟内去除率为96.69%，15分钟内去除率为100%。已确定三维电极反应器中的镍去除机制符合准二级动力学模型。三维电极反应器在10V（1.36×10）时获得的k值是5V时获得的k值的27倍。此外，使用中心复合设计（CCD）对影响三维电极反应器中镍去除的时间、浓度和电位差等操作参数进行了优化。最具影响力的参数是施加电压，其次是时间和浓度。已确定使用EDTA改性微电极的三维电极反应器高效且适用于镍的去除。
