负载零价铁的介孔硅纳米材料的合成及去除污染性能研究
|
摘要
设计、合成了负载纳米零价铁的介孔硅材料,即Fe0/MCM-41复合材料,并通过SEM、XRD对该材料进行了表征;对比了Fe~0、MCM-41、纳米硅球及Fe~0/MCM-41对重金属(铅、汞),无机盐离子(氯化物、溴化物、溴酸盐、氯酸盐)及有机物(四氯化碳)的去除效果,研究明确Fe~0/MCM-41在水中污染物处理中的优势与适用范围。结果表明,纳米零价铁成功负载于介孔硅材料表面,分散均匀,性能良好。该材料具有吸附与还原双重作用机理,在水中重金属、无机含氧盐及氯代有机物的去除上具有明显优势。
In this study, we designed and prepared a kind of nanocomposite by loading nanoscale zero-valent iron(n ZVI) into ordered mesoporous silica materials(Fe~0/MCM-41), which avoided iron oxide and increased the adsorption at the same time. It was characterized by SEM and XRD analysis. The removal efficiencies of heavy metals(Pb~(2+)and Hg~(2+)), inorganic ions(Cl~-, Br~-, ClO_3~-and BrO_3~-) and organic matter(CCl_4) by Fe~0, MCM-41, silica nanoparticles and Fe~0/MCM-41 were studied in order to confirm the superiority and applicable scope of Fe~0/MCM-41 in water treatment. The results indicated that n ZVI/MCM-41 showed the highest removal efficiency to Pb~(2+), Hg~(2+), ClO_3~-, BrO_3~-and CCl_4. Adsorption and reduction of the dual function to improve the removal efficiency and effectiveness.
In this study, we designed and prepared a kind of nanocomposite by loading nanoscale zero-valent iron(n ZVI) into ordered mesoporous silica materials(Fe~0/MCM-41), which avoided iron oxide and increased the adsorption at the same time. It was characterized by SEM and XRD analysis. The removal efficiencies of heavy metals(Pb~(2+)and Hg~(2+)), inorganic ions(Cl~-, Br~-, ClO_3~-and BrO_3~-) and organic matter(CCl_4) by Fe~0, MCM-41, silica nanoparticles and Fe~0/MCM-41 were studied in order to confirm the superiority and applicable scope of Fe~0/MCM-41 in water treatment. The results indicated that n ZVI/MCM-41 showed the highest removal efficiency to Pb~(2+), Hg~(2+), ClO_3~-, BrO_3~-and CCl_4. Adsorption and reduction of the dual function to improve the removal efficiency and effectiveness.
引文
[1]刘振中,邓慧萍,詹健.零价铁在水处理技术中的研究现状及发展趋势[J].工业水处理,2007,27(10):13-16.
[2]Wang Q,Snyder S,Kim J,et al.Aqueous ethanol modified nanoscale zerovalent iron in bromate reduction:synthesis,characterization,and reactivity[J].Environmental Science&Technology,2009,43(9):3292-3299.
[3]Su C M,R W Puis.Nitrate reduction by zerovalent iron:Effects of formate,oxalate,citrate,chloride,sulfate,borate,and phosphate[J].Environmental Science&Technology,2004,38(9):2715-2720.
[4]Sushil R K,Bruce M,Laurent C,et al.Removal of arsenic(III)from groundwater by nanoscale zero-valent iron[J].Environmental Science&Technology,2005,39(5):1291-1298.
[5]Kanel S R,Greneche J M,Choi H.Arsenic(V)removal from groundwater using nano scale Zero-valent iron as a colloidal reactive barrier material[J].Environmental Science&Technology,2006.40(6):2045-2050.
[6]Gillham R W,Hannesin S F.Enhanced degradation of halogenated aliphatcs by zero valent iron[J].Ground water,1994,32(6):958-967.
[7]Raymond M,Zhang L,Arnold W A.Reduction of Haloacetic Acids by Fe0:Implications for Treatment and Fate[J].Environ Sci Technol,2001,35(11):2258-2263.
[8]Yun Zhang,Yimin Li,Jianfa Li,et al.Enhanced removal of nitrate by a novel composite;Nanoscale zero valent iron supported on pillared clay[J].Chemical Engineering Journal,2011,171(2):526-531.
[9]杨麟,伍秀琼,钟宇,等.活性炭负载纳米零价铁去除溴酸盐的研究[J].湖南大学学报:自然科学版,2013,12(42):97-102.
[2]Wang Q,Snyder S,Kim J,et al.Aqueous ethanol modified nanoscale zerovalent iron in bromate reduction:synthesis,characterization,and reactivity[J].Environmental Science&Technology,2009,43(9):3292-3299.
[3]Su C M,R W Puis.Nitrate reduction by zerovalent iron:Effects of formate,oxalate,citrate,chloride,sulfate,borate,and phosphate[J].Environmental Science&Technology,2004,38(9):2715-2720.
[4]Sushil R K,Bruce M,Laurent C,et al.Removal of arsenic(III)from groundwater by nanoscale zero-valent iron[J].Environmental Science&Technology,2005,39(5):1291-1298.
[5]Kanel S R,Greneche J M,Choi H.Arsenic(V)removal from groundwater using nano scale Zero-valent iron as a colloidal reactive barrier material[J].Environmental Science&Technology,2006.40(6):2045-2050.
[6]Gillham R W,Hannesin S F.Enhanced degradation of halogenated aliphatcs by zero valent iron[J].Ground water,1994,32(6):958-967.
[7]Raymond M,Zhang L,Arnold W A.Reduction of Haloacetic Acids by Fe0:Implications for Treatment and Fate[J].Environ Sci Technol,2001,35(11):2258-2263.
[8]Yun Zhang,Yimin Li,Jianfa Li,et al.Enhanced removal of nitrate by a novel composite;Nanoscale zero valent iron supported on pillared clay[J].Chemical Engineering Journal,2011,171(2):526-531.
[9]杨麟,伍秀琼,钟宇,等.活性炭负载纳米零价铁去除溴酸盐的研究[J].湖南大学学报:自然科学版,2013,12(42):97-102.