| 微波诱导金属氧化物去除模拟污染土壤中的PCB77 |
| 摘要点击 2298 全文点击 1183 投稿时间：2008-09-23 修订日期：2009-01-07 |
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| 中文关键词 纳米金属氧化物 微波诱导催化反应 多氯联苯 去除 |
| 英文关键词 nano-particle metal oxides microwave-induced catalytic oxidation polychlorinated biphenyls removal |
| DOI 10.13227/j.hjkx.20090837 |
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| 中文摘要 |
| 采用硅藻土模拟实际土壤，选用纳米金属氧化物为催化剂，在密封体系中研究了微波诱导催化反应对PCB77污染土壤的修复效果，考察了微波辐射时间、不同纳米金属氧化物、酸的浓度和类型、MnO2添加量对PCB77去除效果的影响.结果表明，与无微波辐射的对照相比，微波诱导催化反应1 min后PCB77的去除率提高了1倍.仅微波辐射条件下，PCB77的去除率随着辐射时间的增加而提高，10 min趋于平衡.此时，在加入8 mol/L H2SO4体系中PCB77可去除50%；在加入水的体系中，去除率约为20%；而在加入10 mol/L NaOH或无水体系中去除率几乎为0.微波诱导MnO2催化去除PCB77的效果最好，反应1 min去除率高达90%以上，而Fe2O3、 CuO和Al2O3的催化去除效果较差.在微波诱导MnO2催化条件下，随着H2SO4溶液浓度从1 mol/L增加到8 mol/L，PCB77的去除率从37.0%增加到98.5%，且H2SO4溶液主要是起酸化作用.此外，添加0.01、 0.03和0.05 g MnO2对PCB77催化去除效果基本相同. |
| 英文摘要 |
| The degradation of PCB77 in diatomite by microwave-induced catalytic oxidation was studied in a sealed vial, including four effects such as microwave (MV) radiating time, addition of different nano-particle metal oxides, concentration and type of acids and dosage of MnO2. The results indicated that PCB77 could be removed significantly by microwave-induced catalytic oxidation. Compared to control reactor (without MV radiation), the removal rate of PCB77 increased by twice after 1 min. In addition, the removal rate of PCB77 under MV radiation was gradually increased with time of radiation and then reached equilibrium after 10 min. The removal rates are about 50% and 20% by addition of H2SO4 and ultrapure water respectively. No significant removal was observed by addition of NaOH and without aqueous media. Moreover, catalytic degradation of PCB77 by microwave-induced nano-particle MnO2 had best removal rate was up to 90% after 1 min, in contrast with addition of nano-particle Fe2O3, CuO and Al2O3. The removal rate raised from 37.0% to 98.5% rapidly with the concentration of H2SO4 ranged from 1 mol/L to 8 mol/L, and H2SO4 mainly played a role of acidification but not oxidation. The addition of 0.01, 0.03 and 0.05 g MnO2 showed the similar result. |
