Organosilica Nanotube Templates: One‐Pot Synthesis of Carbon‐Modified Polymeric Carbon Nitride Nanorods for Photocatalysis

Abstract

Polymeric carbon nitride (PCN) nanorods with surface carbon modifications were prepared in a one‐step procedure by using phenylene‐bridged organosilica nanotubes as structure‐directing templates. The carbon‐modified PCN nanorods demonstrated enhanced activity in photocatalytic hydrogen production and the degradation of methyl orange relative to conventional bulk PCN and PCN nanorod templated from pure silica nanotube. The enhancement is attributed to the nanorod structure and the formation of carbon nitride carbon heterojunctions, which facilitate photogenerated charge separation and migration.

Super Small Polymeric Carbon Nitride Nanospheres with Core‐Shell Structure for Photocatalysis

“…The CNS‐550 shows a pseudo first order kinetic rate constant, κ, of 1.74 h −1 , which is about 1.8, 2.3 and 10.9 times higher than those of CNS 1/2 ‐550 (0.96 h −1 ), CNS 1/4 ‐550 (0.76 h −1 ) and bulk CN (0.16 h −1 ), respectively (Figure b). These values are higher than those obtained using most other conventional C 3 N 4 , comparable to those obtained using SBA‐15 as template . The enhanced photocatalytic degradation activity could also be attributed to the special nanosphere nanostructure, promoting charge fast transfer at the CNS surface.…”

“…As shown in Figure , only N1s, C1s and O1s peaks are observed and no Si is detected, which mean the SiO 2 template has been removed completely after the HF etching process. The presence of oxygen with a content of ∼ 3.0 wt% might derive from the absorbed oxygen species, such as water and CO 2 , on the surface of the samples ,. The high resolution C1s spectrum of CNS‐550 is deconvoluted into two peaks at 288.0 and 284.6 eV (Figure b).…”

“…Enormous efforts have been paid to the photocatalysts, which can efficiently convert solar energy to chemical energy . Among them, non‐metallic graphitic carbon nitride (g‐C 3 N 4 ) has been attracted a great deal of interest because of its remarkable electronic, optical and photoelectrochemical properties, which is widely applied for the degradation of wastewater, photocatalytic hydrogen evolution, CO 2 reduction,, solar cells and biological imaging . Furthermore, g‐C 3 N 4 can be simply synthesized using urea, thiourea, melamine,, cyanamide, and dicyandiamide as the precursors.…”

“…The hard templating method is another strategy to fabricate nanostructured PCNs. Recently, we synthesized carbon‐modified C 3 N 4 nanorod in a one step by using phenylene‐bridged organosilica nanotubes as structure directing templates . Considering the low cost, pure SiO 2 is more common as the template.…”

Polydopamine and Barbituric Acid Co‐Modified Carbon Nitride Nanospheres for Highly Active and Selective Photocatalytic CO2 Reduction

“…Graphitic carbon nitride (g‐C 3 N 4 ), a metal‐free and visible‐light driven photocatalyst, has been applied in photocatalytic water splitting to produce H 2 and O 2 fuels, pollutant degradation and CO 2 reduction due to its unique electronic structure . However, the photocatalytic activity of g‐C 3 N 4 for photocatalytic CO 2 reduction is still low due to poor separation of photogenerated electron‐hole pairs , .…”