A novel spherical cellulose adsorbent has been prepared by homogeneous graft polymerization of N,N＇-methylenebisacrylamide （MBA） onto cellulose in an ionic liquid, 1-N-butyl-3-methylimidazolium chloride （BMIMC1）,...A novel spherical cellulose adsorbent has been prepared by homogeneous graft polymerization of N,N＇-methylenebisacrylamide （MBA） onto cellulose in an ionic liquid, 1-N-butyl-3-methylimidazolium chloride （BMIMC1）, which was then partially amine methylated through Mannich reaction to get bifunctionalized materials containing both amide and sulphinate moities. Factors affecting the attachment of functional groups were investigated. The adsorbent was characterized by Elemental Analysis （EA）, Fourier Transform Infrared Spectroscopy （FTIR） and Scanning Electron Microscope （SEM）. Cellulose adsorbent was then tested for its potential applications in the reduction adsorption oftrichloroacetic acid （TCAA） from aqueous solutions.展开更多
A novel spherical cellulose adsorbent with amide and sulphinate groups was used for a first reduction of trichloroacetic acid（TCAA） and a subsequent adsorption of generated species, haloacetic acids. The removal mec...A novel spherical cellulose adsorbent with amide and sulphinate groups was used for a first reduction of trichloroacetic acid（TCAA） and a subsequent adsorption of generated species, haloacetic acids. The removal mechanism involved TCAA reduction by sulphinate groups and the adsorption of the haloacetic acids through electrostatic interaction with amide group. Investigation of product formation and subsequent disappearance reveals that the reduction reactions proceed via sequential hydrogenolysis, and transform to acetate ultimately. Adsorption of haloacetic acids was ascertained by low chloride mass balances（89.3%） and carbon mass balances（75.1%） in solution. The pseudo-first-order rate constant for TCAA degradation was （0.93±0.12） h-1. Batch experiments were conducted to investigate the effect of pH value on the reduction and adsorption process. The results show that the reduction of TCAA by sulphinate groups requires higher pH values while the electrostatic attraction of haloacetic acids by amino group is favorable in more acidic media.展开更多
基金Supported by the Science and Technology Project of Fujian Province Educational Department(JK2013004,JA12040)Science & Technology Development Fund of Fuzhou University(2012-XY-10,2014-XQ-11)the National Natural Science Foundation of China(41372346)
文摘A novel spherical cellulose adsorbent has been prepared by homogeneous graft polymerization of N,N＇-methylenebisacrylamide （MBA） onto cellulose in an ionic liquid, 1-N-butyl-3-methylimidazolium chloride （BMIMC1）, which was then partially amine methylated through Mannich reaction to get bifunctionalized materials containing both amide and sulphinate moities. Factors affecting the attachment of functional groups were investigated. The adsorbent was characterized by Elemental Analysis （EA）, Fourier Transform Infrared Spectroscopy （FTIR） and Scanning Electron Microscope （SEM）. Cellulose adsorbent was then tested for its potential applications in the reduction adsorption oftrichloroacetic acid （TCAA） from aqueous solutions.
基金Supported by the Natural Science Foundation of Fujian Province, China（No.2015J01049）, the Independent Research Project of State Key Laboratory of Photocatalysis on Energy and Environment, China（No.2014C02） and the Science and Technology Project of Fujian Province Educational Department, China（Nos.JK2013004, JA12040）.
文摘A novel spherical cellulose adsorbent with amide and sulphinate groups was used for a first reduction of trichloroacetic acid（TCAA） and a subsequent adsorption of generated species, haloacetic acids. The removal mechanism involved TCAA reduction by sulphinate groups and the adsorption of the haloacetic acids through electrostatic interaction with amide group. Investigation of product formation and subsequent disappearance reveals that the reduction reactions proceed via sequential hydrogenolysis, and transform to acetate ultimately. Adsorption of haloacetic acids was ascertained by low chloride mass balances（89.3%） and carbon mass balances（75.1%） in solution. The pseudo-first-order rate constant for TCAA degradation was （0.93±0.12） h-1. Batch experiments were conducted to investigate the effect of pH value on the reduction and adsorption process. The results show that the reduction of TCAA by sulphinate groups requires higher pH values while the electrostatic attraction of haloacetic acids by amino group is favorable in more acidic media.
