A high activity of Ti/SnO-Sb electrode in the electrochemicaldegradation of 2,4-dichlorophenol in aqueous solution

被引：0

作者：

Junfeng Niu ^{[1
]}

Dusmant Maharana ^{[1
]}

Jiale Xu ^{[1
]}

Zhen Chai ^{[2
]}

Yueping Bao ^{[1
]}

机构：

[1] State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University

[2] School of Chemical and Environmental Engineering, China University of Mining & Technology

来源：

Journal of Environmental Sciences | 2013年 / 07期

关键词：

D O I：

暂无

中图分类号：

X703 [废水的处理与利用];

学科分类号：

083002 ;

摘要：

Electrochemicaldegradation of2,4-dichlorophenol (2,4-DCP) in aqueous solutionwas investigated over Ti/SnO2-Sb anode. The factors influencing thedegradation rate, such as applied currentdensity (2-40 mA/cm2 ), pH (3-11) and initial concentration (5-200 mg/L)were evaluated. Thedegradation of2,4-DCP followed apparent pseudo first-order kinetics. Thedegradation ratio on Ti/SnO2 -Sb anode attained > 99.9% after 20 min of electrolysis at initial 5-200 mg/L concentrations at a constant currentdensity of 30 mA/cm2 with a 10 mmol/L sodium sulphate (Na2SO4 ) supporting electrolyte solution. The results showed that 2,4-DCP (100 mg/L)degradation and total organic carbon (TOC) removal ratio achieved 99.9% and 92.8%, respectively, at the optimal conditions after 30 min electrolysis. Under this condition, thedegradation rate constant (k) and thedegradation half-life (t1/2 )were 0.21 min1 and (2.8 ± 0.2) min, respectively. Mainly carboxylic acids (propanoic acid, maleic acid, propanedioic acid, acetic acid and oxalic acid) weredetected as intermediates. The energy efficiencies for2,4-DCPdegradation (5-200 mg/L)with Ti/SnO2-Sb anode ranged from 0.672 to 1.602 g/kWh. The Ti/SnO2-Sb anodewith a high activity to rapid organic oxidation could be employed todegrade chlorophenols, particularly2,4-DCP inwastewater.

引用

页码：1424 / 1430

页数：7