State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China.
Chemosphere. 2018 Aug;205:41-44. doi: 10.1016/j.chemosphere.2018.04.084. Epub 2018 Apr 16.
Efforts to improve the understanding of oxidant stability are of great practical significance to the design of an in-situ chemical oxidation (ISCO) system for soil and groundwater remediation. In this study, the stability of an emerging ISCO oxidant sodium percarbonate (SPC) was investigated. Although the dry solid form of SPC is relatively stable, dissolved SPC decomposes much faster than HO. SPC had higher oxidation efficiency for the dye Orange G than inactivated or alkaline-activated HO. Both OH and HCO/CO, generated from SPC dissolution, activated the peroxide content of SPC and thus promoted its decomposition and pollutant oxidation. Higher incubation temperature and longer incubation period lead to faster SPC decomposition. Decomposed SPC had lower pollutant oxidation capability.
努力提高对氧化剂稳定性的理解，对于原位化学氧化（ISCO）系统的设计具有重要的实际意义。本研究考察了一种新兴的原位化学氧化氧化剂过碳酸钠（SPC）的稳定性。虽然 SPC 的干固体形式相对稳定，但溶解的 SPC 比 HO 分解得快得多。SPC 对染料橙 G 的氧化效率高于失活或碱性激活的 HO。SPC 溶解生成的 OH 和 HCO/CO，激活了 SPC 的过氧含量，从而促进了其分解和污染物氧化。较高的孵育温度和较长的孵育时间导致 SPC 更快分解。分解的 SPC 的污染物氧化能力较低。
