title: Effective NH2-grafting on attapulgite surfaces for adsorption of reactive dyes.
abstract: The amine moiety has an important function in many applications, including, adsorption, catalysis, electrochemistry, chromatography, and nanocomposite materials. We developed an effective adsorbent for aqueous reactive dye removal by modifying attapulgite with an amino-terminated organosilicon (3-aminopropyltriethoxysilane, APTES). Surface properties of the APTES-modified attapulgite were characterized by the Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption. We evaluated the impact of solvent, APTES concentration, water volume, reaction time, and temperature on the surface modification. NH(2)-attapulgite was used to remove reactive dyes in aqueous solution and showed very high adsorption rates of 99.32%, 99.67%, and 96.42% for Reactive Red 3BS, Reactive Blue KE-R and Reactive Black GR, respectively. These powerful dye removal effects were attributed to strong electrostatic interactions between reactive dyes and the grafted NH(2) groups.
authors.affiliation: College of Chemistry and Chemical Engineering, Nanjing University of Technology, No. 5 Xinmofan Road, Nanjing 210009, Jiangsu Province, PR China.
authors.forename: Ailian
authors.initials: A
authors.lastname: Xue
authors.forename: Shouyong
authors.initials: S
authors.lastname: Zhou
authors.forename: Yijiang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Lu
authors.forename: Pingfang
authors.initials: P
authors.lastname: Han
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D017616:Magnesium Compounds / Q000737:chemistry*; D011930:Reaction Time; D017655:Silicon Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000588:Amines; D004396:Coloring Agents; D017616:Magnesium Compounds; D017655:Silicon Compounds; C026325:attapulgite