| 有机蒙脱石负载纳米铁去除溶液中四溴双酚A的研究 |
| 摘要点击 3978 全文点击 1865 投稿时间：2012-08-27 修订日期：2012-11-15 |
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| 中文关键词 有机蒙脱石 纳米零价铁 四溴双酚A 吸附 还原脱溴 |
| 英文关键词 organobentonite nanoscale zero valent iron(NZVI) tetrabromobisphenol A (TBBPA) adsorbtion reductive debromination |
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| 中文摘要 |
| 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-1 TBBPA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. |
| 英文摘要 |
| 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. |
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