Nitrogen-doped carbon quantum dots from biomass as a FRET-based sensing platform for the selective detection of H₂O₂ and aspartic acid

Abstract

H2O2 with strong oxidizing properties and volatile nature have a potential role in biological systems and industrial applications. Developing an optical “on-off-on” probe for the efficient detection of H2O2 is...

Ecologically Sustainable N-doped Graphene Nanosheets as High-Performance Electrodes for Zinc–Air Batteries and Zinc-Ion Supercapacitors

“…The chemical states of N-GNS were revealed through an X-ray photoelectron spectroscopic (XPS) analysis. The overall survey spectrum (Figure f) features three elements C 1s (285 eV), O 1s (532 eV), and N 1s (400 eV) with 69.67% of C, 20.56% of O, and 9.77% of N. In the high-resolution C 1s spectra as shown in Figure g the seven peaks centered at ∼284.4, 284.74, 285.8, 287.3, 286.42, 287.7, and 288.9 eV of different bonding sites of C 1s arise from CC, C–C, CN, C–N, C–O, CO, and OC–O – , respectively. , In the N 1s high-resolution spectra of N-GNS (Figure h), the three peaks at 398.9, 400.6, and 401.6 eV arise from the pyridinic, pyrrolic, and graphitic-N. , Among all nitrogen-containing functional groups, only graphitic-N and pyridinic-N favor ORR/OER and pseudocapacitive properties . The deconvoluted O 1s spectra feature three typical species C–O (531.2 eV), CO (532.12 eV), and COO– (533.3 eV) as shown in Figure i .…”

“…The chemical states of N-GNS were revealed through an Xray photoelectron spectroscopic (XPS) analysis. The overall survey spectrum (Figure 2f 21,35 In the N 1s high-resolution spectra of N-GNS (Figure 2h), the three peaks at 398.9, 400.6, and 401.6 eV arise from the pyridinic, pyrrolic, and graphitic-N. 36,37 Among all nitrogen-containing functional groups, only graphitic-N and pyridinic-N favor ORR/OER and pseudocapacitive properties. 38 The deconvoluted O 1s spectra feature three typical species C−O (531.2 eV), C�O (532.12 eV), and COO− (533.3 eV) as shown in Figure 2i.…”

Biomass-based graphene aerogel for the removal of emerging pollutants from wastewater

“…Another class of emerging pollutants includes toxic NPs, which are widely used materials in a diverse range of applications such as biosensing, 100,101 energy storage devices, 102 energy conversion devices, 103 production of green hydrogen, 104 catalysts for organic transformation, 105 structural health monitoring, 106 orthodontics, 107 and biomedicine 108,109 depending on their properties. The increasing applications of NPs in every aspect of nanoscience and technology have given rise to a serious concern about their undesired presence in the environment.…”

Photoactive Graphene Aerogel from Biomass for the Visible-Light-Induced Degradation of Pharmaceutical Residues

“…The excellent intrinsic properties, unique morphology, and abundant mass transfer pores of GA provide extra active sites and surfaces for catalysis/interaction. Further heteroatom doping makes tuning the bandgap and optoelectronic properties possible. − The introduction of N atom into the graphitic lattice can enhance the activity of GA by disturbing the electrical neutrality of the framework via polarization and perturbation which enriches the free charge-carrier density and in consequence photocatalytic activity. − The economic viability and industrial adaptation of N-doped GA (N-GA) can only be realized through a low-cost, environmentally friendly, and facile synthetic approach.…”