title: Kinetics and energy efficiency for the degradation of 1,4-dioxane by electro-peroxone process.
abstract: Degradation of 1,4-dioxane by ozonation, electrolysis, and their combined electro-peroxone (E-peroxone) process was investigated. The E-peroxone process used a carbon-polytetrafluorethylene cathode to electrocatalytically convert O2 in the sparged ozone generator effluent (O2 and O3 gas mixture) to H2O2. The electro-generated H2O2 then react with sparged O3 to yield aqueous OH, which can in turn oxidize pollutants rapidly in the bulk solution. Using p-chlorobenzoic acid as OH probe, the pseudo-steady concentration of OH was determined to be ∼0.744×10(-9)mM in the E-peroxone process, which is approximately 10 and 186 times of that in ozonation and electrolysis using a Pt anode. Thanks to its higher OH concentration, the E-peroxone process eliminated 96.6% total organic carbon (TOC) from a 1,4-dioxane solution after 2h treatment with a specific energy consumption (SEC) of 0.376kWhg(-1) TOCremoved. In comparison, ozonation and electrolysis using a boron-doped diamond anode removed only ∼6.1% and 26.9% TOC with SEC of 2.43 and 0.558kWhg(-1) TOCremoved, respectively. The results indicate that the E-peroxone process can significantly improve the kinetics and energy efficiency for 1,4-dioxane mineralization as compared to the two individual processes. The E-peroxone process may thus offer a highly effective and energy-efficient alternative to treat 1,4-dioxane wastewater.
authors: School of Environment, Tsinghua University, Beijing 100084, China.
authors: Huijiao
authors: H
authors: Wang
authors: School of Environment, Tsinghua University, Beijing 100084, China.
authors: Belal
authors: B
authors: Bakheet
authors: School of Environment, Tsinghua University, Beijing 100084, China.
authors: Shi
authors: S
authors: Yuan
authors: School of Environment, Tsinghua University, Beijing 100084, China.
authors: Xiang
authors: X
authors: Li
authors: School of Environment, Tsinghua University, Beijing 100084, China.
authors: Gang
authors: G
authors: Yu
authors: Power and Industrial Systems R&D Center, Toshiba Corporation, Fuchu-shi, Tokyo, Japan.
authors: Seiichi
authors: S
authors: Murayama
authors: School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: wangyujue@tsinghua.edu.cn.
authors: Yujue
authors: Y
authors: Wang
mesh_terms: D004146:Dioxanes / Q000737:chemistry*; D004572:Electrolysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010126:Ozone / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods
chemical_list: D004146:Dioxanes; D010126:Ozone; D006861:Hydrogen Peroxide; C025223:1,4-dioxane
keywords: Advanced oxidation; Electrocatalytic ozonation; Electrolysis; Hydrogen peroxide; Ozone