摘要
研究了改性蒙脱石负载纳米铁材料(NZVI-CMT)在甲醇-水体系中对四溴双酚A(TBBPA)的去除作用,并确定了反应温度、TBBPA初始浓度以及材料投加量等因素对去除效果的影响.结果表明,在25℃条件下,0.02 g NZVI-CMT对初始浓度为10 mg·L-1TBBPA溶液的去除率可达97.5%,而且NZVI-CMT对TBBPA的去除率明显高于两种单一材料即纳米零价铁(NZVI)及有机蒙脱石(CMT)的去除率(18.3%、67.3%),同时也大于两者之和(85.6%).利用NZVI-CMT对TBBPA进行重复去除实验时,前3次的去除率均可达到90%以上.通过检测降解产物并分析材料对TBBPA去除过程的特性,发现NZVI-CMT对TBBPA的去除以吸附为主,并伴有少量还原脱溴反应发生,而且较高的反应温度对降解反应有利.
The removal of tetrabromobisphenol A（TBBPA） in methanol aqueous solutions by nanoscale zero valent iron supported on organobentonite（NZVI-CMT） was studied.The effects of temperature,initial concentration of TBBPA and the dose of NZVI-CMT on the degradation and debromination of TBBPA were investigated.The removal rate by NZVI-CMT reached 97.5% within 12 hours at 25℃,when the initial concentration of TBBPA was 10 mg·L-1.And the removal rate of NZVI-CMT was higher than those of two simple materials,namely organobentonite（CMT） and nanoscale zero valent iron（NZVI）,as well as the sum of those two simple materials.In addition,NZVI-CMT exhibited a better reusable attribute,and the rate of the materials remained above 90% after being used for 3 times.Based on the identification of degradation products and analysis of the TBBPA removal by NZVI-CMT,the main reaction mechanism was suggested as adsorption and debrominnation,and higher reaction temperature was preferable for debrominnation.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第6期2249-2255,共7页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07211-002)
国家科技支撑计划项目(2012BAJ21B07)
关键词
有机蒙脱石
纳米零价铁
四溴双酚A
吸附
还原脱溴
organobentonite
nanoscale zero valent iron（NZVI）
tetrabromobisphenol A（TBBPA）
adsorbtion
reductive debromination
