Abstract：
Polyacrylamide (PAM) in environmental water has become a major problem in water pollution management due to its high molecular mass, high viscosity and non-absorption by soil. CoFe2O4 with strong magnetic properties was prepared by solvent-thermal synthesis method and used as the catalyst for the removal on PAM in heterogeneous Electro-Fenton (EF) system. It showed that the removal efficiency of PAM by the heterogeneous EF system using CoFe2O4 catalyst was 92.01% at pH 3 after 120 min. Further studies indicated that ·OH was the most significant active species for the removal of PAM, and the contribution of ·O2- and SO4·- for the removal of PAM was less than 15%. The reusability test and XRD, XPS, FTIR analyses proved that the catalyst had good stability. After a repeated use for five times, the catalyst still had a high PAM removal rate and stable structure. The valence distribution and functional groups of the phase components of the catalyst did not change significantly before and after the reaction. The possible mechanism of catalyst activation of H2O2 was deduced by mechanism investigation. The CoFe2O4 is an efficient and promising catalyst for the removal of PAM wastewater.
摘要：
聚丙烯酰胺(PAM)由于其分子量较高,已成为环境水体污染管理中的一大难题,高粘度和不被土壤吸收。采用溶剂热合成法制备了具有强磁性的CoFe2O4，并将其用作非均相电芬顿（EF）体系中PAM的去除催化剂。结果表明，在pH值为3的条件下，120min后，使用CoFe2O4催化剂的多相EF系统对PAM的去除效率为92.01％。进一步的研究表明，·OH是去除PAM最重要的活性物种，·O2-和SO4·-对PAM的去除贡献小于15%。可重用性测试和XRD,XPS,FTIR分析证明该催化剂具有良好的稳定性。反复使用五次后，催化剂仍具有较高的PAM去除率和稳定的结构。催化剂相组分的价态分布和官能团在反应前后没有明显变化。通过机理研究，推导了H2O2催化剂活化的可能机理。CoFe2O4是一种高效且有前途的催化剂，用于去除PAM废水。
