A laminar nanocomposite constructed by self-assembly of exfoliated α-ZrP nanosheets and manganese porphyrin for use in the electrocatalytic oxidation of nitrite

Abstract

Laminar nanocomposite of a-ZrP/MnTMPyP, [5, 10, 15, 20-tetrakis (N-methylpyridinium-4-yl) porphyrinato manganese (III)], was obtained through the selfassembly of a-ZrP nanosheets and manganese porphyrin molecules, namely the exfoliation/restacking route. The final products were characterized by several analytic techniques such as XRD, IR, UV-Vis, and SEM. Meanwhile, the surface charge change of layered zirconium phosphate during the restacking process was monitored by a Zetasizer Nano instrument. The zeta potential value of a-ZrP colloidal dispersion is -40.1 mV, indicating that the colloidal dispersion was stable and well dispersed. The cyclic voltammetry measurements of a-ZrP/MnTMPyP film-modified glass carbon electrode displayed a pair of well-defined oxidation/reduction peaks with redox potentials at -0.256 and -0.197 V with an increase in the peak current compared to MnTMPyP aqueous solution. Furthermore, a-ZrP/MnTMPyP hybrid thin film exhibited excellent electrocatalytic activities toward oxidation of nitrite. The oxidation peak current increased linearly with the square root of scan rate, suggesting that the electrocatalytic process was controlled by nitrite diffusion. Finally, a detection limit of 5.3 9 10 -5 M was estimated at a signal-to-noise ratio of 3.0 with a concentration range of 1.5 9 10 -4 to 4.76 9 10 -3 M.

Surface modification of α‐zirconium phosphate by zeolitic imidazolate frameworks‐8 and its effect on improving the fire safety of polyurethane elastomer

“…It indicates that ZIF‐8 is a typical rhombic dodecahedral structure, which is consistent with previous reports . For α‐ZrP, three typical characteristic peaks appear at 2θ = 11.6°, 19.8°, and 25°, which belong to the diffraction peaks of (002), (110), and (112) crystal plane of α‐ZrP, respectively . Further observation shows that all the characteristic diffraction peaks of ZIF‐8 and α‐ZrP appear in the spectrum of ZIF‐8/α‐ZrP, indicating that the ZIF‐8/α‐ZrP hybrid material is prepared successfully.…”

“…24,25 For α-ZrP, three typical characteristic peaks appear at 2θ = 11.6°, 19.8°, and 25°, which belong to the diffraction peaks of (002), (110), and (112) crystal plane of α-ZrP, respectively. 26 Further observation shows that all the characteristic diffraction peaks of ZIF-8 and α-ZrP appear in the spectrum of ZIF-8/α-ZrP, indicating that the ZIF-8/α-ZrP hybrid material is prepared successfully. belong to the stretching vibration of in-plane deformation vibration of P-OH.…”

Functionalization of Graphene Oxide with Porphyrins: Synthetic Routes and Biological Applications

“…α-ZrP owns multiple characteristics that turn it into an interesting alternative to GO, such as a larger surface charge density, high aspect ratio, high ion-exchange capacity, high stability. [223] The intercalation of different porphyrins in α-ZrP has been reported. [223,224] Pan et al have described α-ZrP as selfassembled with MnTMPyP to yield a nanocomposite with promising properties for the electrocatalytic oxidation of nitrate (Figure 17b).…”

“…[223] The intercalation of different porphyrins in α-ZrP has been reported. [223,224] Pan et al have described α-ZrP as selfassembled with MnTMPyP to yield a nanocomposite with promising properties for the electrocatalytic oxidation of nitrate (Figure 17b). [223] The exfoliation and restacking routes were applied to promote the association between α-ZrP and MnTMPyP.…”

“…[223,224] Pan et al have described α-ZrP as selfassembled with MnTMPyP to yield a nanocomposite with promising properties for the electrocatalytic oxidation of nitrate (Figure 17b). [223] The exfoliation and restacking routes were applied to promote the association between α-ZrP and MnTMPyP. In a recent study, Fujimura et al explored the protonation behaviour of TMPyP molecules intercalated in α-ZrP films.…”