Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing 100084, PR China.
Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, PR China.
Sci Total Environ. 2019 Oct 15;687:1028-1033. doi: 10.1016/j.scitotenv.2019.06.189. Epub 2019 Jun 14.
In this study, the strategy of combining radiation with ferrate oxidation was proposed to decrease the adsorbed dosse and enhance the mineralization of carbamazepine in aqueous solution. Compared to single radiation (800 Gy), the combined process of ferrate pretreatment and radiation required lower dose (600 Gy) for totally removing carbamazepine. During the combined process, the removal efficiency of total organic carbon (TOC) reached 22.2%. However, the removal efficiencies of carbamazepine and TOC decreased when ferrate and radiation were used simultaneously, indicating that the addition of ferrate during the radiation process had negative effect on the removal of carbamazepine. In contrast, the radiation followed by ferrate oxidation presented the best performance in decreasing the absorbed dose and enhancing the mineralization of carbamazepine. Carbamazepine could be completely removed under all conditions. TOC removal efficiency reached 18.3%, 31.3%, 52.9% and 60.6%, respectively, at the adsorbed dose of 100, 300, 600 and 800 Gy when 0.4 mM ferrate was adopted. The enhanced TOC removal could be due to the enhanced oxidation capacity of ferrate caused by the pH decrease at the end of radiation and the further oxidation of intermediate products formed during the radiation process by ferrate. Seven degradation products were identified in total, and thus the degradation pathway of carbamazepine was proposed. This study provides a possible way to decrease the adsorbed dose and enhance the mineralization of carbamazepine by radiation.
在这项研究中，提出了将辐射与高铁酸盐氧化相结合的策略，以降低吸附剂量并增强水溶液中卡马西平的矿化。与单一辐射（800Gy）相比，高铁酸盐预处理和辐射的联合工艺需要更低的剂量（600Gy）即可完全去除卡马西平。在联合工艺中，总有机碳（TOC）的去除率达到 22.2%。然而，当同时使用高铁酸盐和辐射时，卡马西平和 TOC 的去除效率降低，表明在辐射过程中添加高铁酸盐对卡马西平的去除有负面影响。相比之下，辐射后接着进行高铁酸盐氧化在降低卡马西平的吸附剂量和增强其矿化方面表现出最佳性能。在所有条件下都可以完全去除卡马西平。当采用 0.4mM 高铁酸盐时，在吸附剂量为 100、300、600 和 800Gy 时，TOC 的去除效率分别达到 18.3%、31.3%、52.9%和 60.6%。TOC 去除效率的提高可能是由于辐射结束时 pH 值降低导致高铁酸盐氧化能力增强，以及高铁酸盐进一步氧化辐射过程中形成的中间产物所致。总共鉴定出了 7 种降解产物，因此提出了卡马西平的降解途径。本研究为通过辐射降低卡马西平的吸附剂量并增强其矿化提供了一种可能的途径。
