摘要 为克服过硫酸钾(K2S2O8)作为氧化剂修复污染水体反应过快且无选择性的缺点,采用油相相分离法制备了硬脂酸包裹过硫酸钾的微胶囊材料,实现了过硫酸钾的缓慢释放,并以活性艳红X-3B为代表污染物研究其降解性能.结果表明:活性艳红X-3B的去除率受微胶囊芯材与壁材的比例、活化剂的投加量和修复时长等影响.最佳条件为:当微胶囊芯壁质量比为1∶2时,在水中达到90%释放率的时间为163.2 h(6.8 d),当活化剂/微胶囊质量比为1∶10,反应72 h时,活性艳红X-3B去除率达96.4%.采用XRD、SEM和FTIR等手段对微胶囊结构和表面形态等进行了分析,发现过硫酸钾活性组分没被破坏,硬脂酸通过化学键合包覆在过硫酸钾表面.缓释后的微胶囊表面出现了明显的孔洞和裂缝,为过硫酸钾缓慢释放提供了有利条件. In order to overcome the disadvantage of potassium persulfate(K2S2O8)as an oxidant to repair the polluted water,the oil phase separation method was used to prepare the stearic acid encapsulated potassium persulfate microcapsule material,which realized the slow release of potassium persulfate.Moreover,the degradation performance of potassium persulfate was studied with reactive brilliant red X-3B as the representative pollutant.Results show that the degradation of reactive brilliant red X-3B rate by microcapsules,such as the ratio of core material and wall material,the dosing quantity and the repair time of activator,its optimal condition is:when the mass ratio of 1∶2 microcapsule core wall and released in full time in the water is greater than 6.8 d,activator/quality ratio of 1∶10 microcapsule,the reaction time of 72 h,reactive brilliant red X-3B degradation rate was 96%.At the same time,XRD,SEM and FTIR were used to analyze the microcapsule structure and surface morphology.It was found that the active components of potassium persulfate were not destroyed and the stearic acid was coated on the surface of potassium persulfate through chemical bonding.After the slow release,obvious holes and cracks appeared on the surface of the microcapsule,which provided favorable conditions for the slow release of potassium persulfate.
出处 《沈阳大学学报:自然科学版》 CAS 2021年第2期108-116,共9页 Journal of Shenyang University:Natural Science
基金 国家水体控制与治理科技重大专项(2018ZX07601-002) 辽宁省自然科学基金指导计划项目(20180550803).
关键词 高级氧化技术 微胶囊 过硫酸钾 活性艳红X-3B 去除率 advanced oxidation technique microcapsule potassium persulfate reactive brilliant red X-3B degradation
