Table 5 The Zr content in the intact ZrO2@L-tryptophan catalyst and recovered catalyst by ICP-MS.

From: Novel L-tryptophan-functionalized zirconium dioxide nanoparticles catalysed one-pot and solvent-free synthesis of 2 H-indazolo [2, 1-b] phthalazine-triones

Element

Experimental content (wt%)

Content after recycling (wt%)

Leaching amount (wt%)

Zr

18.3 ± 0.2

18.1 ± 0.3

< 0.01

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