Self-tuning tetragonal zirconia-based bimetallic nano(hydr)oxides as superior and recyclable adsorbents in arsenic-tolerant environment: Template-free in and ex situ synthetic methods, stability, and mechanisms

Subbaiah Muthu Prabhu, Keiko Sasaki, S. SD Elanchezhiyan, G. Paruthimal Kalaignan, Chang Min Park

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In this study, we aimed to decorate nano-ZrO2 on LaOx to enhance the architectural stability of LaOx for the uptake of both arsenate and arsenite in single solutions. LaOx was obtained as lanthanum methanoate (LaMe) from a simple solvothermal reaction of lanthanum and benzoic acid. The leaving group of formic acid was used as a reducing agent to grow ZrO2 over LaOx, which resulted in a nanocomposite denoted as ZrO2@x%LaMe. The de-arsenic behavior of this composite was compared with that of one-pot-synthesized La-ZrO2 and ZrO2@x%La(OH)3, with La(OH)3 being obtained commercially. Powder X-ray diffraction patterns showed that the ZrO2 structure was transformed from monoclinic to tetragonal during the formation of ZrO2@x%LaMe, La-ZrO2, and ZrO2@x%La(OH)3. Among the synthesized nano-bimetallic composites, ZrO2@50%LaMe exhibited the highest adsorption densities for both arsenate and arsenite due to the uniform distribution of ZrO2 over the LaOx surface resulted in a larger Brunauer–Emmett–Teller specific surface area and a higher zeta potential charge. The synthesized nanocomposites were reused several times with the aid of 0.1 M HNO3 for maximizing the uptake of both arsenate and arsenite from water. Selectivity and the stability (pH) studies indicated that the nanocomposites were highly selective and showed zero-dissolution behavior, respectively. The results of this study suggested that these nanocomposites could be used as alternatives for many La-based adsorbent materials in practical applications.

Original languageEnglish
Article number124573
JournalChemical Engineering Journal
Publication statusPublished - Jun 15 2020


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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