Lanthanum carbonate nanofibers for phosphorus removal from water

Yaewon Park, Christopher Gorman, Ericka Ford

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Cross-linked poly(vinyl alcohol) nanofibers were dipped in alternating solutions of aqueous lanthanum acetate and alkali metal carbonates (for up to 10 cycles) to precipitate lanthanum carbonate. Only sodium carbonate yielded Na–La double-metal carbonates and lanthanum carbonate hydroxide as the cycles of precipitation increased. Potassium and cesium carbonates yielded lanthanite phases that removed more P than inorganics derived from Na2CO3 (212 and 157 mg P g−1 nanofiber, respectively, at pH 7 after 110 h). The lanthanum carbonate from Na2CO3 and K2CO3 showed the greatest potential for P removal when exposed to groundwater for more than 24 h. Among the phase and pH-dependent mechanisms of P removal, lanthanite transformed to lanthanum phosphate at neutral pH and phosphate ions exchanged with carbonate ions. Hydration of crystalline phases (synthesized from Na2CO3 and Cs2CO3) was accompanied by phosphate ion sorption at pH 10. Within 24 h, phosphate ion sorption was higher at pH 10 than pH 7, indicating that ion exchange between phosphate and carbonate at pH 7 occurs relatively slower than diffusion of hydrated phosphate ions at pH 10. Selective P removal of the developed lanthanum carbonate mineralized nanofibers will help develop novel water purification technology that can be used in contaminated sites.

Original languageEnglish
Pages (from-to)5008-5020
Number of pages13
JournalJournal of Materials Science
Volume55
Issue number12
DOIs
Publication statusPublished - 2020 Apr 1

Bibliographical note

Publisher Copyright:
© 2020, Springer Science+Business Media, LLC, part of Springer Nature.

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Ceramics and Composites
  • Mechanical Engineering
  • Polymers and Plastics
  • General Materials Science
  • Materials Science (miscellaneous)

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