摘要
工业废水排放量逐年增多,其中含酚废水危害大,处理困难。为此,采用高压脉冲放电协同纳米型催化剂TiO_2和Fe-TiO_2对苯酚进行了降解处理实验,考察了催化剂的焙烧温度、投加质量对苯酚降解率的影响,并分析了苯酚中间产物质量浓度、溶液矿化率和总有机碳(TOC)质量浓度。结果显示:焙烧温度和投加质量对苯酚降解率有一定的影响,随着焙烧温度的升高、投加质量的增加,苯酚降解率均是先升高后降低;与单独脉冲放电相比,协同催化剂放电有效提高了苯酚降解率,且协同Fe-TiO_2催化剂的效果最佳;当Fe-TiO_2催化剂的投加质量为0.05 g,焙烧温度为450℃,放电时间为140 min时,苯酚降解率最高,达98.75%;中间产物质量浓度随放电时间的变化而呈现先增大后减小的趋势,相比单独脉冲放电,在协同TiO_2放电时间内苯二酚不再间断出现,且其他3种物质峰值质量浓度均有所提高,达到峰值质量浓度后的下降速度更快;相比投加TiO_2催化剂,在协同Fe-TiO_2放电时间内苯二酚完全降解,且对苯酚、对苯醌的峰值质量浓度均有所降低;投加催化剂后,矿化率提升幅度较大,相比单独脉冲放电,协同Fe-TiO_2放电时间为140 min时,溶液矿化率提高了1倍以上。研究结果可为脉冲放电协同催化剂技术处理苯酚废液提供一定的理论支撑。
The discharge of industrial waste water is increasing year by year. We adopted high-voltage pulse discharge combine with two types of nanometer catalyst TiO2 and Fe-TiO2 to degrade phenol to treat industrial waste water, inves- tigated the degradation of the phenol affected by the catalyst calcination temperature and the additive amount, and analyzed the phenol intermediate products, the rate of mineralization, and total organic carbon （TOC）. The results show that there is a certain influence on the phenol degradation rate of the calcination temperature and additive amount, with the increase of temperature and adding dosage, the Phenol degradation rate would increase and then decrease; compared with single-high voltage, pulse discharge, coordination catalyst discharge can effectively improve the degradation rate of phenol, particularly treated by high-voltage pulse discharge combined with Fe-TiO2 degraded phenol best; when 0.05 g Fe-TiO2 catalyst is added, the calcination temperature is 450 -C, and discharged 140 min, degradation rate of solution is as high as 98.75%; the concentration of intermediate will increase then decrease as the time changes, compared with single pulse discharge, resorcinol no longer appears continuously when treated by high-voltage pulse discharge combined with TiO2; the peak concentration of the other three materials will increase and then decrease faster, compared with high-voltage pulse discharge combined with TiO2, resorcinol decompose completely and the peak concentration of hy- droquinone and benzoquinone decrease when treated by high voltage pulse discharge combined with Fe-TiO2; the mineralization rate is increased by a big margin when a catalyst is added, compared with single high-voltage pulse dis- charge, when treated by high-voltage pulse discharge combined with Fe-TiO2 for 140 min, it increases over one time. The results can provide some theoretical supports for the treatment of phenol waste by pulsed discharge synergistic catalyst.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第8期2645-2652,共8页
High Voltage Engineering
基金
国家自然科学基金(50867003)~~
关键词
放电
纳米型催化剂
降解
中间产物
苯酚
降解率
矿化率
discharge
nanometer catalyst
degrade
intermediate products
phenol
degradation rate
mineralization rate
作者简介
董冰岩1974-，男，博士，教授，硕导主要从事脉冲放电低温等离子体在环境保护方面的应用及工业安全防护技术研究电话：（0797）8312371 E-mail：dongbingyan1@sina．com
孙宇（通信作者）1992-，男，硕士主要从事脉冲放电低温等离子协同催化剂在环境保护中的应用研究制备研究E—mail：237468903@qq.com
