title: Simultaneous removal of methylene blue and copper(II) ions by photoelectron catalytic oxidation using stannic oxide modified iron(III) oxide composite electrodes.
abstract: Stannic oxide modified Fe(III) oxide composite electrodes (SnO2/Fe2O3) were synthesized for simultaneously removing methylene blue (MB) and Cu(II) from wastewater using photoelectron catalytic oxidation (PEO). The SnO2/Fe2O3 electrodes were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoelectrochemical techniques. The removal of MB and Cu(II) by PEO using the SnO2/Fe2O3 composite electrodes was studied in terms of reaction time, electric current density, and pH of the electrolyte. The kinetics of the reactions were investigated using batch assays. The optimal reaction time, pH, and electric current density of the PEO process were determined to be 30 min, 6.0, and 10 mA/cm(2), respectively. The removal rates of MB from wastewater treated by PEO and electron catalytic oxidation process were 84.87% and 70.64%, respectively, while the recovery rates of Cu(II) were 91.75% and 96.78%, respectively. The results suggest that PEO is an effective method for the simultaneous removal of MB and Cu(II) from wastewater, and the PEO process exhibits a much higher removal rate for MB and Cu(II) compared to the electron catalytic oxidation process. Furthermore, the removal of MB was found to follow the Langmuir-Freundlich-Hinshelwood kinetic model, whereas the removal of Cu(II) fitted well to the first-order reaction model.
authors: College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors: Jinqiu
authors: J
authors: Qi
authors: College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an, Shandong 271018, PR China. Electronic address: lixiaochen02@163.com.
authors: Xiaochen
authors: X
authors: Li
authors: College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors: Hao
authors: H
authors: Zheng
authors: College of Chemistry and Material Science, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors: Peiqiang
authors: P
authors: Li
authors: College of Chemistry and Material Science, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
authors: Huying
authors: H
authors: Wang
mesh_terms: D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D010084:Oxidation-Reduction; D017971:Tin Compounds / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D005290:Ferric Compounds; D017971:Tin Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D003300:Copper; C045358:stannic oxide; D008751:Methylene Blue
keywords: Catalysis; Copper(II) ions; Methylene blue; Oxidation; Photoelectron