Decomposition of persistent organic pollutants in solid phase using metallic calcium under mild conditions

在我们之前的研究中，采用高和易性金属钙和Rh/C催化剂，在25℃、0.15~0.5 MPa、温和条件下的密封管中，通过简单的搅拌操作，在24 h内完成99%以上的固相持久性有机污染物（POPs）的高效降解。本研究旨在揭示反应机理，并将反应效率提高十倍以上。经过多次研究，我们发现处理后酒精溶液中出现了一些重金属的浸出和晶格的变化，如粉煤灰中的赤铁矿，根据化学分析电子能谱（ESCA），电感耦合等离子体（ICP）和x射线衍射（XRD）的估计。在优化条件下，对粉煤灰等固相污染物的降解效率达到99.9%。

In our previous researches, it was proved that 99% over of highly efficient degradation of persistent organic pollutants (POPs) in solid phase was accomplished in 24 h through a simple stirring operation using high workability metallic calcium and Rh/C catalyst in an alcoholic solution under mild conditions in a sealed tube at 25 °C within 0.15~0.5 MPa. This study aims to reveal the reaction mechanism and to improve the efficiency over tenfold. After our many investigations, we found that the leaching of some heavy metals and a change of the crystal lattice, such as hematite in fly ash, in alcoholic solution occur after the treatment, according to estimation using electron spectroscopy for chemical analysis (ESCA), inductively coupled plasma (ICP), and x-ray diffraction (XRD). We finally achieved 99.9% of degradation efficiency for POPs in solid phase such as fly ash under optimization conditions.