☆ 4.7 Article

Interconnected superporous adsorbent prepared via yeast-based Pickering HIPEs for high-efficiency adsorption of Rb+, Cs+ and Sr2+

CHEMICAL ENGINEERING JOURNAL (2019)

Journal

CHEMICAL ENGINEERING JOURNAL

Volume 361, Issue -, Pages 1411-1422

Publisher

ELSEVIER SCIENCE SA

DOI: 10.1016/j.cej.2018.11.006

Keywords

Pickering emulsion; Yeast; Superporous adsorbent; Adsorption; Metal ions

Funding

National Natural Science Foundation of China [21706267, 51403221]
West Light project of Chinese Academy of Sciences, China [KeFaRenHan Word [2016] 84]
Youth Innovation Promotion Association CAS [2016370]

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Abstract

High internal phase emulsions (HIPEs) template method is an emerging effective method of fabricating high-efficiency, orderly porous polymer adsorbents, but the conventional HIPEs template requires harmful surfactants, so the development of surfactant-free green emulsion templates become the subject of great significance. Herein, we prepared a green surfactant-free oil-in-water (O/W) Pickering HIPEs stabilized solely with non-toxic caustic-pretreated yeast (P-Yeast), and used it as template to prepare a novel adsorbent (P-Yeast-PAA) with interconnected superporous structure by a one-step solution polymerization of acrylic acid (AA) monomers in the emulsion. Interestingly, the surfactant-free Pickering-HIPEs exhibited superior stability due to the fine affinity between P-Yeast and AA monomer, and the pore structure of the adsorbent can be easily regulated by changing the contents of the monomer or the particles used for stabilizing the emulsion. In addition, the adsorbents prepared from P-Yeast based emulsion template have interconnected pore structure, which are significantly superior to other Pickering-HIPEs templates which are hard to form a similar pore structure. The opencell superporous adsorbent containing a large number of eCOO-functional group has a fast capture rate and strong adsorption capability for radioactive Rb+, Cs+ and Sr2+ ions, and the saturated adsorption capacities are 179.69 mg/g (2.10 mmol/g), 229.52 mg/g (1.73 mmol/g) and 166.81 mg/g (1.90 mmol/g), and the equilibrium adsorption time are 30, 40 and 20 min, respectively. The porous adsorbent also has excellent regeneration ability and reusability, and maintains a high adsorption capacity after repeated use of five adsorption-desorption cycles. This study provides an environmentally-friendly and promising strategy for fabricating the interconnected superporous adsorbent for adsorption removal of radioactive metal ions.

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Metal ion-triggered Pickering emulsions and foams for efficient metal ion extraction

Zhaohui Huang, Xiuping Sun, Yihan Liu, Jiwei Cui, Aixin Song, Jingcheng Hao

Summary: The study demonstrates the construction of emulsions and foams using surfactant particles as stabilizers, with HDEHP and NaOH system forming O/W emulsions which can be transformed into W/O Pickering emulsions by introducing metal ions. The combination of DEHP- and metal ions also generates particles for ultrastable foams, enabling efficient removal of metal ions from water and effective recycling of HDEHP.

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