摘要
建立了以石墨碳棒为阴极,Pt为阳极,饱和甘汞电极为参比电极,Na2SO4为支持电解质溶液的H2O2制备三电极体系。对电流密度、pH值、通氧流量、支持电解质浓度和极间距等主要参数对生成H2O2的影响进行了单因素轮换试验研究,并采用正交试验方法对这些因素进行了分析。结果发现,pH值对生成H2O2的影响最为显著,支持电解质浓度和通氧流量也具有较大影响,极间距影响不明显,电流密度则存在着最佳值。通过试验获得的最优参数组合为:pH=2.00,电流密度=1.02mA·cm-2,通氧流量=0.4L·min-1,支持电解质浓度=0.1mol·L-1,极间距=6cm。在该参数组合条件下,采用电-Fenton法对活性染料RedMX-5B进行脱色和矿化试验,初始Fe2+投量为0.25mmol·L-1,电解180min,脱色率可达90%以上,但矿化率不高(<25%)。因此,提高矿化率是染料废水处理在未来的主要课题。
A three-electrode system had been set up for the H2O2 production, in which graphite, Pt and saturated calomel electrode were used as cathode, anode and reference electrode respectively, and Na2SO4 as supporting electrolyte. The main influencing factors of the H2O2 in situ generation, including current density, oxygen flow, concentration of supporting electrolyte and electrode distance, had been examined and analyzed in this work. The results of this orthogonal test showed that pH was the most important factor during the generation of H2O2, and concentration of supporting electrolyte and oxygen flow also affected the yield prominently. However, electrode distance＇s effect was unconspicuous, and there was an optimal value of current density. Moreover, according to the experiment, the optimal operation conditions were： pH = 2.00, current density=1.02 mA·cm^2, oxygen flow=0.4 L·min^-1, concentration of supporting electrolyte= 0.1 mol·L^-1, electrode distance= 6 cm. Under the optimal conditions, reactive dye Red MX-5B was degraded by electro-Fenton method, more than 90% of decolourization ratio was observed with [Fe^2＋]0=0.25 mmol·L^-1 at 180 min. Electro-Fenton method was identified a novel decolourization technology. However, electro-Fenton method had a low mineralization ratio for Red MX-5B （〈25%）. Therefore, to improve the mineralization ratio is the main task in the dye wastewater treatment.
出处
《生态环境》
CSCD
北大核心
2006年第3期503-508,共6页
Ecology and Environmnet
基金
国家自然科学基金项目(50478049)
广东省自然科学基金项目(04011215)
关键词
电-FENTON
过氧化氢
影响囚素
染料
脱色
electro-Fenton
hydrogen peroxide
influencing factors
dye
decolourization
