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Green synthesis of ultrapure La(OH)<sub>3</sub> nanoparticles by one-step method through spark ablation and electrospinning and its application to phosphate removal

  • Li, Shiyang (author)
  • Huang, Xiangfeng (author)
  • Wan, Zhengyu (author)
  • Liu, Jia (author)
  • Lu, Lijun (author)
  • Peng, Kaiming (author)
  • Schmidt-Ott, A. (author)
  • Bhattarai, Rabin (author)
Publication Date
Jan 01, 2020
DOI: 10.1016/j.cej.2020.124373
TU Delft Repository
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<p>La(OH)<sub>3</sub> metal engineered nanoparticles (MENPs) are efficient phosphate binders; however, complex synthesis procedures and purity as well as agglomeration issues impede their development and practical applications. Herein, a green and a one-step method in combination with the spark ablation aerosol technology and electrospinning is proposed for the synthesis of La(OH)<sub>3</sub> MENPs; further, their application as phosphate binders are elucidated as a proof the concept. Material characterization results confirm the successful synthesis of ultrapure La(OH)<sub>3</sub> MENPs, which has not been achieved before via an environmentally friendly one-step procedure. Small angle X-ray scattering and X-ray photoelectron spectroscopy etching results show that La(OH)<sub>3</sub> MENPs loading on the electrospun nanofibers are uniform in both two and three dimensions. The comparative tests revealed a high phosphate adsorption capacity (110.8 mg P/g La) and indicted that the La(OH)<sub>3</sub> MENPs perform well; this was observed even under the interference of coexisting ions (Cl<sup>−</sup>, SO<sub>4</sub> <sup>2−</sup>, NO<sub>3</sub> <sup>−</sup>, and F<sup>−</sup>) at different pH values. After three cycles of solution-shaking treatment, the release of La(OH)<sub>3</sub> was less than 1 wt% (0.5 wt%), which was acceptable for an adsorbent. These results indicate that the La(OH)<sub>3</sub> MENP-loaded nanofibers are practical phosphate binders due to the simple production methods, low manufacturing cost, and impressive capacity. The proposed method significantly shortens the loading process and is a promising alternative for not only the synthesis of the adsorbent, but also for other engineering materials where loading is needed.</p> / ChemE/Materials for Energy Conversion & Storage

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