摘要
用3种吡啶阳离子(氯化吡啶、溴化丁基吡啶、溴化十四烷基吡啶)改性制备高、低电荷的有机膨润土,研究其吸附亲水性芳香胺(苯胺和N,N-二甲基苯胺)的性能,并通过有机碳含量分析、粉末X射线衍射、N2-BET等手段表征了有机膨润土的结构,试图揭示有机膨润土层间硅氧烷表面的暴露程度与吸附性能之间的关系.结果表明,通过减少层间电荷和用较小分子尺寸的吡啶阳离子改性,能在膨润土层间暴露较大面积的硅氧烷表面,从而增强对亲水性有机物的吸附.如在六种吡啶盐改性的有机膨润土中,用最小分子尺寸的吡啶阳离子(氯化吡啶)改性的低电荷膨润土(L-HP)具有较大的内比表面积(145m.2g-1)和孔容(0.082mL.g-1),显示出较强的吸附性能,对水中20mg·mL-1的N,N-二甲基苯胺和苯胺的去除效率分别为85.6%和52.8%.研究结果为进一步开发新型高效有机膨润土吸附材料提供理论依据.
Studies of the interlayer siloxane surface are important for improving the sorption capability of organobentonite. In this study, reduced-charge bentonite and normal-charge bentonite were modified with pyridinium chloride, butylpyridinium bromide and myristylpyridinium bromide. The sorption of N, N-dimethylamine and aniline onto these organobentonites was investigated and compared. The greatest sorption magnitudes of N, N-dimethylamine and aniline were observed on the reduced-charge bentonite modified with pyridinium chloride （L-HP）. The respective removal efficiencies of 20 mg·L^-1 N, N-dimethylamine and aniline by L-HP were 85. 6% and 52. 8%. To reveal the sorption mechanism, the structures of the organobentonites were characterized by their organic carbon content, surface area interlayer spacing, etc. Among these organobentonites, L-HP had the largest internal surface area （ 145 m^2·g^ - 1 ） and pore volume （0. 082 m· g^ - 1 ） , indicating the greatest exposure of the interlayer siloxane surface. These results demonstrate that the sorption of aromatic amines on organobentonites is significantly enhanced by exploiting the interlayer siloxane surface, which may aid in the design of powerful sorbents.
出处
《环境科学学报》
CAS
CSCD
北大核心
2009年第4期797-801,共5页
Acta Scientiae Circumstantiae
基金
国家自然科学基金资助项目(No.20737002
50378081)
浙江省科技厅重大项目(No.2006C13058)
教育部长江学者和创新团队计划(No.IRT0536)~~
