Porous g-C_3N_4 and supported porous g-C_3N_4 were fabricated for the first time by a simple strategy using pretreated melamine as a raw material and pretreated quartz rod as a substrate.The formation of a richly porous microstructure can be attributed to the co-existence of different pore-fabricating units in the preparation system for porous g-C_3N_4.The richly porous microstructure endowed the as-prepared porous g-C_3N_4 with an excellent photocatalytic activity.The as-prepared supported porous g-C_3N_4 exhibited considerable stability because of the existence of chemical interaction between porous g-C_3N_4 and the quartz rod substrate.The photocatalytic activity of the supported porous g-C_3N_4 was competitive with that of porous g-C_3N_4 in powder form because neither the surface migration of photogenerated electrons nor the diffusion of the target organic pollutant were affected by the construction of the quartz rod reactor.The photocatalytic activity of the as-prepared porous g-C_3N_4 and supported porous g-C_3N_4 was preliminarily evaluated by the treatment of single-component organic wastewater under visible-light irradiation.Subsequently,the as-prepared porous g-C_3N_4 was further applied in conventional hydrogen evolution and a new system for simultaneous hydrogen evolution with organic-pollutant degradation.The hydrogen yield and degradation efficiency both increased with increasing photocatalytic activity of the as-prepared materials in the system for simultaneous hydrogen evolution with organic-pollutant degradation.
A series of highly dispersed platinum‐deposited porous g‐C3N4 (Pt/pg‐C3N4) were successfully fabricated by a simple in situ photoreduction strategy using chloroplatinic acid and porous g‐C3N4 as precursors. Porous g‐C3N4 was fabricated by a pretreatment strategy using melamine as a raw material.The morphology, porosity, phase, chemical structure, and optical and electronic properties ofas‐prepared Pt/pg‐C3N4 were characterized. The photocatalytic activity of as‐prepared Pt/pg‐C3N4was preliminarily evaluated by the degradation of aqueous azo dyes methyl orange under visible light irradiation. The as‐prepared Pt/pg‐C3N4 were further applied to the degradation and mineralization of aqueous 4‐fluorophenol. The recyclability of Pt/pg‐C3N4 was evaluated under four consecutive photocatalytic runs.
Zhenxing ZengKexin LiKai WeiYuhua DaiLiushui YanHuiqin GuoXubiao Luo
