过硫酸盐缓释材料在地下水修复中的应用研究进展

Research progress on the application of persulfate slow-release materials in groundwater remediation

过硫酸盐作为一种强氧化剂,通过多种活化方式可生成氧化性极强的硫酸根自由基(SO_(4)^(-)·),广泛运用于处理环境中难降解污染物,因此对地下水修复具有重要的应用价值。在实际修复过程中,存在过硫酸盐利用率低,氧化剂浪费等现象,而将缓释技术与氧化剂相结合,提高过硫酸盐利用率具有较大的研究前景。结合国内外研究现状,对过硫酸盐缓释材料的制备、释放性能及在地下水修复中的应用效果进行探讨。认为:过硫酸盐缓释材料是一种新型、环保、应用前景广泛的地下水污染材料,具有持续有效性长、材料添加次数少、在地下水中较稳定、分解与流失少等特点,制备过程也相对简单。针对特定污染物及场地的污染特征,可采用不同缓释结的过硫酸盐缓释材料,极大地改善地下水原位化学氧化修复技术的应用情景。研究结论为材料的改进和发展提供建议及展望。

As a strong oxidant,persulfate can generate highly oxidizing sulfate radicals(SO_(4)^(-))through various activation methods,and is widely used in the treatment of refractory pollutants in the environment.Therefore,it has important application value for groundwater remediation.In the actual repair process,there are phenomena such as low utilization rate of persulfate and waste of oxidant.Combining slow-release technology with oxidant to improve the utilization rate of persulfate has great research prospects.Combined with the research status at home and abroad,the preparation,release performance and application effect of persulfate sustained-release materials in groundwater remediation are discussed.It is considered that persulfate slow-release material is a new type of groundwater pollution material with environmental protection and wide application prospect.It has the characteristics of long continuous effectiveness,less material addition times,relatively stable in groundwater,less decomposition and loss,and the preparation process is relatively simple.According to the pollution characteristics of specific pollutants and sites,persulfate slow-release materials with different slow-release structures can be used to greatly improve the application scenario of groundwater in-situ chemical oxidation remediation technology.The research conclusions provide suggestions and prospects for the improvement and development of materials.