摘要
目前,废旧聚氯乙烯造成的环境污染已经成为全球关注的环境问题。该工作对聚氯乙烯的机械化学法降解影响因素(球料比、转速、脱氯时间、质量比)进行了分析。同时,对球磨产物进行了SEM、XRD、IR检测分析。得出以下结论:球磨转速为550 r/min,球料比为35,CaO、PVC、SiO_2的质量比为14∶1∶1时,球磨1 h后聚氯乙烯的脱氯率即可达到100%左右。PVC在球磨过程中发生断链与氧化反应,长链逐渐断裂形成短链,并最终形成小分子物质,并随着球磨时间增加而逐渐碳化;氯离子可能以无定形形态存在;球磨过程中PVC上的C—Cl键断裂,Cl从PVC上脱除下来,从有机Cl转化为无机Cl,从而达到脱氯除毒的目的。
At present, the environmental pollution caused by waste PVC has become a global concern of environment. This study explores and analyzes the various factors that affect the rate of dechlorination of PVC. Meanwhile, milled product was detected and analyzed by SEM, XRD, IR. Results indicate that when the milling speed is 550 r/min, ball feed ratio is 35, and mass ratio of CaO, PVC, SiO_2 is 14∶1∶1, the dechlorination rate of PVC milling for 1h can reach 100%. In the milling process,PVC chain scission and oxidation reaction occurs, the long-chain are gradually broken, and eventually become small molecules, and becoming carbon; chloride ions may exist in amorphous form. C-Cl bond is broken, Cl is removed from PVC, and it is converted from organic to inorganic, so as to achieve the purpose of detoxification.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第11期190-193,210,共5页
Environmental Science & Technology
基金
国家自然基金项目(51008189,51474146)
上海市自然基金项目(14ZR1416900)
