Efficient degradation of organic pollutants and hydrogen evolution by g-C₃N₄ using melamine as the precursor and urea as the modifier

Abstract

A novel metal-free photocatalyst g-C3N4/g-C3N4 isotypeheterojunction has been successfully fabricated. More importantly, the as-obtained material exhibits remarkable enhanced photocatalytic properties owing to the designed visible-light bandgap and band edges..

Highly Efficient g‐C3N4 Nanorods with Dual Active Sites as an Electrocatalyst for the Oxygen Evolution Reaction

“…The high resolved deconvoluted spectra of C, N and O elements were studied to further understand the bonding state of each element (Figure b–d). In Figure b, the deconvoluted C1s spectra for all nanorods revealed a peak centered at 284.6 eV which is assigned to sp 2 hybridized C atoms (C=C/C−C), The peaks centered at 286.77, 285.76, 285.96 and 285.72 in g‐CN0, g‐CN0.5, g‐CN1.5 and g‐CN2 respectively, are attributed to sp 3 hybridized C atoms bonded with N, which can originate from either graphitic or pyridinic N bonding configurations . The spectra for g‐CN0 and g‐CN2 showed peaks centered at 289.51&288.24 eV respectively, which are assigned to C=O, while the spectra for g‐CN0.5 and g‐CN1.5 revealed peaks at 283.8 and 283.25 eV respectively, which are attributed to sp 3 C−C bond …”

“…The appearance of these new peaks possibly results from two reasons; 1) the modification of a group containing N and O elements indicating the incorporation of oxygen because of urea addition and 2) the dissolution of g-C 3 N 4 implying the introduction of certain groups into the tri-s-triazine units of g-C 3 N 4 during the hydrothermal treatment. [20,21] The intensity of all the peaks increased with increasing amount of urea indicating higher crystallinity. The FT-IR analysis was used to investigate the molecular vibrations of intercalated ions.…”

“…In addition to these peaks, two new peaks at 6.16 (1 0 0) and 10.6 (2 2 0) were observed for urea treated samples. The appearance of these new peaks possibly results from two reasons; 1) the modification of a group containing N and O elements indicating the incorporation of oxygen because of urea addition and 2) the dissolution of g‐C 3 N 4 implying the introduction of certain groups into the tri‐s‐triazine units of g‐C 3 N 4 during the hydrothermal treatment . The intensity of all the peaks increased with increasing amount of urea indicating higher crystallinity.…”

“…The high resolved deconvoluted spectra of C, N and O elements were studied to further understand the bonding state of each element (Figure 2b-d). In Figure 2b, the deconvoluted C1s spectra for all nanorods revealed a peak centered at 284.6 eV which is assigned to sp 2 hybridized C atoms (C=C/ CÀ C), [20] The peaks centered at 286.77, 285.76, 285.96 and 285.72 in g-CN0, g-CN0.5, g-CN1.5 and g-CN2 respectively, are attributed to sp 3 hybridized C atoms bonded with N, which can originate from either graphitic or pyridinic N bonding Scheme 1. Synthesis scheme of g-C 3 N 4 nanorods using calcination followed by hydrothermal method.…”

Heteroatom‐Doped Carbonaceous Photocatalysts for Solar Fuel Production and Environmental Remediation

“…Herein, the preparation and properties of g‐C 3 N 4 isotype hybrids are presented (Table ). The differences in the band structure between two different phases enable the formation of isotype hybrids at the interface of different g‐C 3 N 4 components, leading to the enhanced photocatalytic activity from promoted charge separation …”