title: Enhanced reactivity of microscale Fe/Cu bimetallic particles (mFe/Cu) with persulfate (PS) for p-nitrophenol (PNP) removal in aqueous solution.
abstract: In this study, batch experiments were conducted to examine the enhanced reactivity of microscale Fe/Cu bimetallic particles (mFe/Cu) with persulfate (PS) for p-nitrophenol (PNP) removal in aqueous solution. The key operating parameters (i.e., theoretical Cu mass loadings (TMLCu), mFe/Cu dosage, PS dose, initial pH and temperature) were optimized by the batch experiments, respectively. The experimental data were followed well the pseudo-first-order kinetic model. Result reveals that refractory PNP (500 mg L-1) was effectively degraded by mFe/Cu-PS system with removal of 98.4% and kobsof 1.91 min-1after only 3 min treatment under the optimal operating conditions. Moreover, compared with control experiments (i.e., mFe/Cu, microscale Fe0with PS (mFe0-PS), and PS alone), mFe/Cu-PS system exerted better performance for PNP removal due to the strong synergistic effect between PS and mFe/Cu. According to the analysis results of degradation kinetics of PNP, COD (chemical oxygen demand) removal, UV-vis absorption spectra and the intermediates formed, the results reveal that the PNP removal by mFe/Cu-PS system was mainly attributed to reduction accompanied slight oxidation. And based on the analysis of surface characteristics of mFe/Cu particles, it is further demonstrated that PS could enhance the reactivity of mFe/Cu through rapid corrosion of iron surface and decrease of surface passivation of mFe/Cu surface when the low molar ratio of PS to mFe/Cu (i.e., 1:43) was used in this study. These results also illustrates mFe/Cu-PS can be as a high efficient pretreatment technology for the removal of toxic refractory PNP from wastewater.
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Ji
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China.
authors.forename: Zhaokun
authors.initials: Z
authors.lastname: Xiong
authors.affiliation: Department of Environmental Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China. Electronic address: laibo@scu.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Lai
mesh_terms: D057919:Biological Oxygen Demand Analysis; D003300:Copper / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D003300:Copper; D007501:Iron; D009596:Nitrophenols; D012996:Solutions; D062065:Wastewater; D014874:Water Pollutants, Chemical; C024836:4-nitrophenol
keywords: Enhancement effect; Microscale Fe/Cu bimetallic particles (mFe/Cu); Persulfate (PS); p-Nitrophenol (PNP)