Preparation of polyacrylamide/silica composite capsules by inverse Pickering emulsion polymerization--颗粒学报PARTICUOLOGY

Zhang, K., Wang, Q., Meng, H., Wang, M., Wu, W., & Chen, J. (2014). Preparation of polyacrylamide/silica composite capsules by inverse Pickering emulsion polymerization. Particuology, 14, 12–18. https://doi.org/10.1016/j.partic.2013.02.010

Preparation of polyacrylamide/silica composite capsules by inverse Pickering emulsion polymerization

Kui Zhang ^{a b}, Qian Wang ^b, Hong Meng ^c *, Mian Wang ^b, Wei Wu ^b *, Jianfeng Chen ^b

a National Institute of Clean-and-Low-Carbon Energy, Shenhua Group Corporation Ltd., Beijing 102209, China
b Key Laboratory of Organic and Inorganic Composite Materials, Beijing University of Chemical Technology, Beijing 100029, China
c College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

10.1016/j.partic.2013.02.010

Volume 14, June 2014, Pages 12-18

Received 19 September 2012, Revised 18 January 2013, Accepted 16 February 2013, Available online 15 June 2013.

E-mail: menghong@mail.buct.edu.cn; wuwei@mail.buct.edu.cn; wwlhqy@163.com

Highlights

• PAM/SiO₂ composite microcapsules were prepared by inverse Pickering emulsion polymerization.

• Synthesized capsules consisted of a SiO₂ nanoparticle shell and a polymer inner layer.

• Size and rigidity of the capsules depended on concentrations of SiO₂ and AM during preparation.

• Composite capsules exhibited high adsorption capacity and rate to Hg(II) ions.

Abstract

Polyacrylamide/silica (PAM/SiO₂) composite capsules were synthesized by inverse Pickering emulsion polymerization. Silica nanoparticles modified with methacryloxypropyltrimethoxysilane (MPS) were used as a stabilizer. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and thermal gravimetric analysis (TGA) were used to characterize the morphology and composition of the composite capsules. SEM and TEM images showed that capsules consisted of a particle shell and a polymer inner layer. The capsule size depends on the nanoparticle concentration in the continuous phase. The composite rigidity largely depends on the acrylamide concentration. FTIR and TGA results indicated the existence of polyacrylamide and SiO₂ in the composite particles. Aqueous Hg(II) removal testing by the PAM/SiO2 composite capsules indicated promising potential for removing heavy metal ions from wastewater.

Graphical abstract

Keywords

PAM/SiO₂ composite capsule; Inverse Pickering emulsion polymerization; Mercury ion; Adsorption

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