Abstract
This work demonstrates a simple and versatile deep eutectic solvent (DES)-assisted synthesis of bullet-shaped cerium-zinc oxide (Ce-ZnO) and sheet-like cerium-zinc hydroxide nitrate (Ce-Zn-5(OH)(8)(NO3)(2)center dot 2H(2)O). DES could serve not only as a green solvent but also as a superior template to produce these two different hierarchically shaped materials. Interestingly, Ce-ZnO shows catalytic activity toward polymerization of dopamine to initially pink color quinone derivatives with the visible light absorption at 475 nm and finally to blue-emitting polydopamine with highest fluorescence intensity at 480 nm. The catalytic activity of Ce-ZnO can be selectively inhibited by pyrophosphate ions (PPi), which leads to a decrease in the absorbance intensity or fluorescence emission. PPi detection strategies were established, and the linearity was achieved from 0.5 to 100 mu M with a low detection limit of 0.05 mu M for the fluorometric detection, while the linear detection was 0.5-150 mu M and the low detection limit was 0.19 mu M for colorimetric detection. This work offers a new opportunity to produce Ce-ZnO and Ce-Zn-5(OH)(8)(NO3)(2)center dot 2H(2)O using an inexpensive and eco-friendly solvent, and provides a useful way of detecting PPi. Hence, from these findings, the proposed synthesis strategy is expected to serve as a novel green strategy for preparing hierarchically shaped materials.

Keywords Plus：GRAPHENE QUANTUM DOTSSYNOVIAL-FLUIDCOMPETITIVE COORDINATIONINORGANIC PYROPHOSPHATEZNO NANOSTRUCTURESHIGHLY EFFICIENTFLUORESCENTDOPAMINEPOLYDOPAMINEAMPLIFICATION

Published in  ACS SUSTAINABLE CHEMISTRY & ENGINEERING，Volume 9；10.1021/acssuschemeng.1c03960，NOV 15 2021