摘要
为解决纳米零价金属在水中暴露出的极易聚集与氧化的问题,本研究使用铜作为纳米零价铁(NZVI)的复合金属,制得纳米Fe/Cu双金属,并用羧甲基纤维素钠(CMC)对其包覆改性.使用扫描电子显微镜、X射线衍射以及氮气吸附/脱附等温线对改性前后的双金属进行表征.结果表明,改性之后的材料具有更大的尺寸以及比表面积,且抗氧化性得到显著增强.材料的沉降实验以及对2,4-二氯苯酚(2,4-DCP)降解实验的结果揭示,CMC的包覆比对改性后双金属的分散性与反应活性影响较大.当包覆比为80%时,双金属的分散稳定性最强,释放的活性位点个数最多,表现为最高的反应活性.此时脱氯效率达到90.3%,且脱氯过程和产物发生明显改变.
In order to solve the problem that nano zero-valent metal is easily aggregated and oxidized in water, the nanoscale Fe/Cu bimetal was prepared by using copper as the composite metal of nano zero-valent iron(NZVI) and modified by carboxymethylcellulose sodium(CMC) in this research. The bimetal before and after modification was characterized using scanning electron microscope, X-ray diffraction and nitrogen adsorption/desorption isotherms. The results showed that the modified bimetal had larger size and specific surface area, and the oxidation resistance was significantly enhanced. The results of sedimentation test and degradation experiment of 2,4-dichlorophenol(2,4-DCP) showed that the cladding proportion of CMC had obvious influence on the dispersion and reactivity of bimetal after modification. When the cladding proportion of CMC was 80%, the modified bimetal represented the strongest stability, the largest number of active spots, and the highest reactivity. Meanwhile, the dechlorination efficiency could reach 90.3%, and the dechlorination process and product were obviously changed.
作者
潘煜
孙力平
张婷婷
刘楠楠
王栋
王晨晨
邱春生
王少坡
PAN Yu;SUN Liping;ZHANG Tingting;LIU Nannan;WANG Dong;WANG Chenchen;QIU Chunsheng;WANG Shaopo(School of Environmental and Municipal Engineering,Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384)
出处
《环境科学学报》
CAS
CSCD
北大核心
2019年第4期1174-1182,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金资助项目(No.51478292)
