摘要
构建Pt/生物炭电极反应器,研究其对水中腐殖酸的去除效率和去除特性.结果表明,在电流密度为20 m A·cm^(-2)下反应300 min,Pt/生物炭电极反应器对水中腐殖酸的去除率为74.58%,较Pt/石墨电极反应器47.10%去除率提高58.3%.Pt/生物炭电极反应器对水中腐殖酸的去除主要通过电化学氧化和气浮作用.生物炭阴极比石墨阴极能产生更多的H_2O_2,是提高Pt/生物炭电极反应器对腐殖酸去除率的重要原因.三维荧光光谱和凝胶色谱法分析表明,Pt/生物炭电极反应器具有较强的氧化能力,可将较小分子量的腐殖酸直接矿化.研究结果显示生物炭可以作为一种新型电化学反应器的阴极材料用于对水中有机污染物处理.
A Pt / biochar electrode reactor was developed to remove humic acid in water. The removal efficiency and characteristics of the reactor were investigated. Experimental results showed that Pt / biochar electrode reactor obtained 74. 58% removal rate after 300 min reaction under current density of 20 m A·cm-2. The removal rate was increased by 58. 3% comparing with 47. 10% removal rate achieved by Pt / graphite electrode reactor. Electrochemical oxidation and air floating played the main roles in removal of humic acid from water. The improved removal efficiency of humic acid in Pt / biochar electrode reactor was attributed to the fact that the biochar cathode could produce more H2O2 than graphite cathode. Three-dimensional excitation emission matrix fluorescence spectroscopy and Gel permeation chromatography measurement revealed that Pt / biochar electrode reactor had strong oxidation capability to mineralize the low molecular weight humic acid directly. It suggests that biochar could be use as an innovative cathode material of electrode reactor for organic pollutants treatment in water.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2016年第8期3073-3078,共6页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07102-001-004)
重庆市基础与前沿研究计划项目(CSTC2014JCYJA20019)
重庆大学大型仪器设备开放基金项目(201406150061)
关键词
生物炭
电极反应器
腐殖酸
高级氧化
气浮
biochar
electrode reactor
humic acids
advanced oxidization
air flotation
