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《Acta Scientiae Circumstantiae》 2009-04
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The sorption of aromatic amines onto the interlayer siloxane surface of organobentonites

RUAN Xiuxiu,ZHU Lizhong,CHEN Baoliang Department of Environmental Science,Zhejiang University,Ministry of Education Key Lab of Environmental Remediation and Ecosystem Health,Hangzhou 310028  
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 m2·g-1)and pore volume(0.082 mL·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.
【Fund】: 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)~~
【CateGory Index】: X703
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