摘要
零价纳米铁(NZVI)具有较高活性,近年受到人们关注并将其应用于地下水污染原位修复,但在实际应用中NZVI易发生氧化与团聚,容易失活。因此尝试运用环境友好型材料对NZVI进行表面改性,选择羧甲基纤维素(CMC)对纳米铁进行表面包覆获得CNZVI,研究不同CMC含量包覆NZVI的分散稳定性和CNZVI对水中六价铬的去除效果。结果表明:经过改性后的CNZVI分散稳定性要明显优于商用纳米铁RNIP,包覆CMC的比例越高,CNZVI的稳定性越好,在较高的CMC包覆比例下,纳米铁不易失活并具有良好的反应活性,对溶液中六价铬有很好的去除效果。
Nano zero-valent iron （NZVI）is an attractive material for in-situ groundwater remediation due to its high activity.However,oxidation and aggregation are easily happened on NZVI and lower its reduction ability. Therefore,researchers try to use environment-friendly materials to do surface modification on NZVI.A kind of carboxymethyl cellulose （CMC）coating NZVI is synthesized （CNZVI）.Its dispersity and reactivity was studied in this paper.The results showed that stabilization of CNZVI is obviously better than commercial RNIP.The higher proportion CMC coating has,the greater stabilization and dispersity CNZVI has.CNZVI also has a good performance on Cr（VI）removal in water.
出处
《现代地质》
CAS
CSCD
北大核心
2013年第6期1484-1488,共5页
Geoscience
基金
中国地质调查局项目(1212011120288)
中央高校基本科研业务费专项(2012123
2010ZD14)
国家科技重大专项"水体污染控制与治理科技重大专项"(2009ZX07424-002)
中国地质大学(北京)大学生创新性实验计划项目(201211415008)
关键词
纳米零价铁
羧甲基纤维素
分散性
六价铬
nanoscale zero-valent iron
carboxymethyl cellulose
dispersity
Cr（VI）
