研究报告

  • 李虹,吕小凡,马溢阳,杨慧,杨琦.超声协同Fe0@Fe3O4降解四氯化碳[J].环境科学学报,2018,38(7):2650-2658

  • 超声协同Fe0@Fe3O4降解四氯化碳
  • Degradation of carbon tetrachloride by nanoscale zero-valent iron@magnetic Fe3O4 compound with ultrasound assistance
  • 基金项目:北京市产学研项目(No.51900265005);国家水体污染控制与治理科技重大专项(No.2009ZX07207-008,2009ZX07419-002,2009ZX07207-001,2015ZX07406005-001);中央高校基本科研业务费专项资金(No.2652013101,2652013086,2652013087);国家重大科学仪器设备开发专项(No.2012YQ060115)
  • 作者
  • 单位
  • 李虹
  • 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
  • 吕小凡
  • 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
  • 马溢阳
  • 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
  • 杨慧
  • 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
  • 杨琦
  • 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
  • 摘要:采用附着在Fe3O4纳米颗粒上的纳米零价铁(nZVI)对四氯化碳(CCl4)还原脱氯.同时,利用SEM和BET等技术对Fe0@Fe3O4的表面形貌和粒径进行表征,探究了不同反应条件如Fe0@Fe3O4投加量、超声功率、初始pH值、温度和CCl4初始浓度对CCl4去除率的影响.最后,比较了Fe0@Fe3O4、nZVI和Fe3O4颗粒对CCl4的去除效果.结果表明,Fe0@Fe3O4比nZVI比表面积更大、分散性更好.超声功率和温度的提高对CCl4的降解有明显的促进作用.在最佳条件(催化剂投加量0.5 g·L-1,超声功率300 W,初始pH=7.0,温度30℃,CCl4初始浓度2 mg·L-1)下,Fe0@Fe3O4复合材料在60 min内对CCl4的去除效率为88.5%,明显高于nZVI(60.9%)和Fe3O4颗粒(13.2%).Fe0@Fe3O4对CCl4去除过程符合伪一级动力学模型.
  • Abstract:Nano-scale zero-valent Iron (nZVI) attached on the Fe3O4 nanoparticles were applied in the reductive dechlorination of Carbon Tetrachloride (CCl4). The surface morphology and particle size of Fe0@Fe3O4 were characterized by way of SEM and BET measurements. The effects of different reaction conditions such as Fe0@Fe3O4 dosage, ultrasound power, initial pH value, temperature and initial concentration of CCl4 on the removal rate of CCl4 were investigated. At the same time, the degradation of CCl4 by Fe0@Fe3O4, nZVI and Fe3O4NPs under the same conditions was compared. The results showed that both the specific surface area of Fe0@Fe3O4 NPs was lager and the dispersibility was better than that of nZVI. The improvement of ultrasonic power and temperature can effectively promote the degradation ratio of CCl4. Under the optimum conditions (the catalyst dosage was 0.5 g·L-1, the ultrasonic power was 300 W, the initial pH value was 7.0, the temperature was 30℃, the initial concentration of CCl4 was 2 mg·L-1), the Fe0@Fe3O4 showed a CCl4 removal efficiency of 88.5% in 60 min, which was much greater than that of nZVI (60.9%) and Fe3O4NPs (13.2%). The removal process obeyed the pseudo first-order kinetic model.

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