论文部分内容阅读
采用化学还原法制备了纳米Fe0颗粒,研究了不同条件下纳米Fe0对3种单氯酚(2-CP,3-CP,4-CP)的去除作用.结果表明,纳米Fe0对单氯酚具有良好的去除效果,主要降解途径为先脱氯后开环,实现氯酚分子与Fe原子间的电子转移,达到还原脱氯的效果.3种单氯酚的脱氯难易程度为2-CP>3-CP>4-CP,脱氯反应活性与其分子最低空轨道能量(ELUMO)有关.随着氯酚初始浓度的增大,其相对去除率略有降低,但绝对降解量有较大提高.温度不仅影响脱氯速率,而且影响氯酚去除的途径,温度较高时,氯酚先脱氯后开环;温度低时,较易产生氧化产物.
The nano Fe0 particles were prepared by chemical reduction method, and the removal of three kinds of monochlorophenols (2-CP, 3-CP, 4-CP) by nano-Fe0 under different conditions was studied.The results showed that Fe0 nano- Good removal effect, the main degradation pathway is dechlorination and ring opening to achieve the electron transfer between chlorophenol molecules and Fe atoms, and to achieve the effect of reducing dechlorination.The degree of dechlorination of 3 kinds of monochlorophenols is 2-CP > 3-CP> 4-CP, the dechlorination reactivity is related to its lowest molecular orbital energy (ELUMO) .The relative removal rate slightly decreases with the increase of initial concentration of chlorophenols, but the absolute degradation is greatly increased The temperature not only affects the rate of dechlorination, but also affects the way of chlorophenol removal. At higher temperatures, chlorophenols are dechlorinated and then ring opened; at lower temperatures, oxidation products are more likely to occur.