Direct bromination of nano hydroxyapatite strategy towards particle brushes via surface-initiated ATRP for highly efficient heavy metal removal. (21st November 2019)

• Record Type: Journal Article
• Authors: Wang, Miaomiao; Wang, Xiao; Zhang, Kangmin; Wu, Mingyuan; Wu, Qingyun; Liu, Jiuyi; Yang, Jianjun; Zhang, Jianan
• Is Part Of: Polymer. Volume 183(2019)
• Publication Date: 2019-11-21
• Subjects: Hydroxyapatite -- Water miscible organic solvent -- SI-ATRP -- Particle brushes -- Adsorption -- Heavy metal ions; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2019.121883
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Aminated n-HAP-g-polyacrylonitrile (n-HAP-g-APAN) particle brushes were developed for highly efficient heavy metal removal based on surface-initiated ATRP (SI-ATRP) and subsequent amination. An efficient one-step method for morphology controlled synthesis of ATRP initiator immobilized n-HAP (n-HAP-Br) was realized by using 2-bromoisobutyric acid as tetherable initiator. Uniform and individually dispersed n-HAP-Br NCs were obtained with controlled morphology and particle size by adding portion of water miscible organic solvents to rational adjusting aqueous dispersion medium. Aminated n-HAP-g-APAN displayed record-high adsorption capacity of heavy meatal ions due to the combined contributions of grafted APAN providing pendent amino diethylenepentamine as chelating groups and n-HAP core towards heavy metal ions (pure n-HAP of qe = 284.4 mg/g vs n-HAP-g-APAN of qe = 944.4 mg/g). The proposed one-step direct bromination of n-HAP strategy provides the preparation of uniform n-HAP NCs ready for polymer grafting and further fabrication of n-HAP-g-polymers via SI-ATRP for various applications depending on the characteristic of grafted polymers. Graphical abstract: Image 1 Highlights: Individual and uniform ATRP initiator tethered n-HAP NCs are synthesized by one-step co-precipitation method. n-HAP-g-PAN particle brushes are prepared by SI-ATRP. Particle brushes bearing pendent amino diethylenepentamine groups are obtained by amination. Aminated particle brushes display record high adsorption capacity due to combined pendent chelating groups and n-HAP core.