A novel magnetic weak acid resin NDMC-1 was prepared in the presence of methyl acrylate （MA）, divinylbenzene （DVB） and titanate coupling agent （TCA） coated γ-Fe203 particles. To evaluate the adsorption of Cu^2...A novel magnetic weak acid resin NDMC-1 was prepared in the presence of methyl acrylate （MA）, divinylbenzene （DVB） and titanate coupling agent （TCA） coated γ-Fe203 particles. To evaluate the adsorption of Cu^2＋ on the obtained resin NDMC- 1, another two magnetic resins NDMC-0 （the precursor of NDMC-1 without hydrolyzation） and NDMO-1 （the synthesized weak acid resin using oleic acid coated γ-Fe2O3） were chosen for comparison. The results showed that the carboxyl groups were formed after hydrolyzation, and NDMC-1 exhibited a greater adsorption capacity to Cu2~. The desorption experiment demonstrated that the desorption ratio at pH 2 （95.14%） was greatly higher than pH 3 （25.97%）. Moreover, the magnetic resin NDMC-1 was proved to be stable at pH 2, extending the application of magnetic materials which were always considered to be acid-nor, resistant.展开更多
A novel magnetic anion exchange resin NDM-1 was prepared through suspension polymerization and then functionalized with ammonolysis and alkylating agents.Its application for selective removal of nitrate was performed ...A novel magnetic anion exchange resin NDM-1 was prepared through suspension polymerization and then functionalized with ammonolysis and alkylating agents.Its application for selective removal of nitrate was performed in comparison with MIEX.The results demonstrated that NDM-1 achieved higher efficiency in nitrate removal than MIEX did,with or without the existence of competing anion SO_4^2- ascribed to its longer alkyl chains on exchange sites.Combined with the advantage of easy separation due toγ-Fe_2O_3 implanted,the magnetic anion exchange resin NDM-1 was considered to be superior to MIEX for nitrate removal in practical application.展开更多
Bilayer-silane-coated Fe304 nanoparticles with inner layer of tetraethoxy silane （TEOS） and outer layer of vinyltriethoxysilane （VTEO） were generated to enhance their acid resistance. These nanoparticles were copo...Bilayer-silane-coated Fe304 nanoparticles with inner layer of tetraethoxy silane （TEOS） and outer layer of vinyltriethoxysilane （VTEO） were generated to enhance their acid resistance. These nanoparticles were copolymerized with vinylbenzyl chloride （VBC） using suspension polymerization, and then post-crosslinked. The resulting hypercrosslinked magnetic resin M150 presented specific bimodal property with large specific surface area of 1109 m2/g. It exhibited more excellent adsorption capacity of p- nitrophenol compared to another two magnetic adsorbents Q150 and MIEX~. Moreover, the acid stable property of the magnetite in MI50 extended its application at low pH value.展开更多
基金support provided by Program for Changjiang Scholars,NSFC(Nos. 51178215 and 51208249)Jiangsu Nature Science Fund(Nos.BK2010006 and BK2011032)Joint Innovation Project for Production-Study-Research in Jiangsu Province(No.BY2012155) China
文摘A novel magnetic weak acid resin NDMC-1 was prepared in the presence of methyl acrylate （MA）, divinylbenzene （DVB） and titanate coupling agent （TCA） coated γ-Fe203 particles. To evaluate the adsorption of Cu^2＋ on the obtained resin NDMC- 1, another two magnetic resins NDMC-0 （the precursor of NDMC-1 without hydrolyzation） and NDMO-1 （the synthesized weak acid resin using oleic acid coated γ-Fe2O3） were chosen for comparison. The results showed that the carboxyl groups were formed after hydrolyzation, and NDMC-1 exhibited a greater adsorption capacity to Cu2~. The desorption experiment demonstrated that the desorption ratio at pH 2 （95.14%） was greatly higher than pH 3 （25.97%）. Moreover, the magnetic resin NDMC-1 was proved to be stable at pH 2, extending the application of magnetic materials which were always considered to be acid-nor, resistant.
基金provided by Program for Changjiang Scholars and Innovative Research Team in University,NSFC(Nos.50825802 and 51178215)Jiangsu Natural Science Fund(Nos. BK2010006 and BK2011032),China
文摘A novel magnetic anion exchange resin NDM-1 was prepared through suspension polymerization and then functionalized with ammonolysis and alkylating agents.Its application for selective removal of nitrate was performed in comparison with MIEX.The results demonstrated that NDM-1 achieved higher efficiency in nitrate removal than MIEX did,with or without the existence of competing anion SO_4^2- ascribed to its longer alkyl chains on exchange sites.Combined with the advantage of easy separation due toγ-Fe_2O_3 implanted,the magnetic anion exchange resin NDM-1 was considered to be superior to MIEX for nitrate removal in practical application.
基金support provided by Program for Changjiang Scholars and Innovative Research Team in University,NSFC(Nos.50825802 and 51178215)Jiangsu Nature Science Fund(Nos. BK2010006 and BK2011032)P.R.China
文摘Bilayer-silane-coated Fe304 nanoparticles with inner layer of tetraethoxy silane （TEOS） and outer layer of vinyltriethoxysilane （VTEO） were generated to enhance their acid resistance. These nanoparticles were copolymerized with vinylbenzyl chloride （VBC） using suspension polymerization, and then post-crosslinked. The resulting hypercrosslinked magnetic resin M150 presented specific bimodal property with large specific surface area of 1109 m2/g. It exhibited more excellent adsorption capacity of p- nitrophenol compared to another two magnetic adsorbents Q150 and MIEX~. Moreover, the acid stable property of the magnetite in MI50 extended its application at low pH value.
