Nickel-foam-supported b-Ni( OH) 2 as a green anodic catalyst for energy efficient electrooxidative degradation of azo-dye wastewater

Sun, Shan1; Diao, Peng1; Feng, Cuiyun1; Ungureanu, Eleonora-Mihaela2; Tang, Yi3; Hu, Bin3; Hu, Qing3

2018

10.1039/c8ra03039a

RSC Advances   影响因子和分区

2046-2069

Electrochemical oxidative degradation (EOD) is a particularly promising technique for removing organic pollutants from wastewater. However, due to the high overpotential of EOD in conventional anode materials, the energy cost of EOD is usually very high, which greatly promotes the search for highly active, stable, and energy-efficient anodic catalysts. Herein, we demonstrated that nickel-foam-supported (NF-supported) -Ni(OH)(2) (NF/-Ni(OH)(2)) prepared via a facile hydrothermal method could be used as an energy efficient anode for EOD. The as-prepared 3D porous NF/-Ni(OH)(2) exhibited high activity toward the electrochemical oxidation of methyl orange (MO) in the low potential region (<1.07 V vs. SCE). This property differs greatly from those of the conventional anode materials that require a high positive potential to keep them active for EOD, making NF/-Ni(OH)(2) an energy-efficient and active anode material for EOD. With an oxidation current density of 0.25 mA cm(-2), the decolorization of MO was completed within 30 min, and the COD removal after 3h of reaction was 63.0%. The normalized energy consumption for the 3 h degradation of MO was 22.2 kW h (kg COD)(-1), which is only a fraction of (or even one tenth of) the values reported in the literature. Moreover, NF/-Ni(OH)(2) had a good stability and recyclability for EOD. No activity decay was observed during 10 h of EOD and the COD removal remained almost unchanged after four consecutive reaction cycles. We demonstrated experimentally that the NF/-Ni(OH)(2) anode could generate large amounts of hydroxyl radicals and that the oxidation of MO by hydroxyl radicals was the main mechanism during EOD. We believe that this work opens a new avenue for developing highly active and energy-efficient anode materials that can work in the low potential region for EOD.

SCI ; EI

英语

通讯

China-Romania Inter-Governmental Science & Technology Cooperation Project[42-26]

Chemistry

Chemistry, Multidisciplinary

WOS:000434261100051

ROYAL SOC CHEMISTRY

20182305293517

Anodes ; Azo dyes ; Catalysts ; Chemical oxygen demand ; Electrochemical oxidation ; Energy utilization ; Nickel ; Organic pollutants

Energy Conservation:525.2 ; Energy Utilization:525.3 ; Nickel:548.1 ; Electron Tubes:714.1 ; Electrochemistry:801.4.1 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Compounds:804.1

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, 37 Xueyuan Rd, Beijing 100191, Peoples R China
2.Univ Politehn Bucuresti, Fac Appl Chem & Mat Sci, Dept Phys Chem & Electrochem, Bucharest 060042, Romania
3.Southern Univ Sci & Technol, Shenzhen 518055, Guangdong, Peoples R China

Sun, Shan,Diao, Peng,Feng, Cuiyun,et al. Nickel-foam-supported b-Ni( OH) 2 as a green anodic catalyst for energy efficient electrooxidative degradation of azo-dye wastewater[J]. RSC Advances,2018,8(35):19776-19785.

Sun, Shan.,Diao, Peng.,Feng, Cuiyun.,Ungureanu, Eleonora-Mihaela.,Tang, Yi.,...&Hu, Qing.(2018).Nickel-foam-supported b-Ni( OH) 2 as a green anodic catalyst for energy efficient electrooxidative degradation of azo-dye wastewater.RSC Advances,8(35),19776-19785.

Sun, Shan,et al."Nickel-foam-supported b-Ni( OH) 2 as a green anodic catalyst for energy efficient electrooxidative degradation of azo-dye wastewater".RSC Advances 8.35(2018):19776-19785.