Biomass porous carbon as the active site to enhance photodegradation of oxytetracycline on mesoporous g-C₃N₄

Abstract

A novel mesoporous g-C3N4 loaded with biomass porous carbon was synthesized by molten salt assisted thermal polycondensation, and the formation of hollow tubular structure increased the specific surface area.

A composite of biomass porous carbon supported g‐C3N4 by 2,4,6‐triaminopyrimidine modification for enhancing oxytetracycline removal

“…Compare with the g‐C 3 N 4 , the TAP‐BPC/CN materials exhibited more porous and loose morphology of nanosheets after the TAP introduction. It was deduced that the BET surface area and pore structure were improved by the adding of TAP and BPC 22 . Whereas further increasing TAP content to 10 wt%, the layers of g‐C 3 N 4 became smaller and the pore structure was destroyed, then the surface area and pore structure were both reduced instead, indicating that the collapse of the g‐C 3 N 4 structure was caused by the excessive introduction of TAP.…”

“…On the one hand, TAP doping could effectively improve the carrier mobility of g‐C 3 N 4 , which favored the separation of photo‐generated electron–hole pairs, and thus improved the photocatalytic performance of photocatalytic materials 34 . On the other hand, the significant removal of OTC by XTAP‐BPC/CN composites might be attributed to the excellent adsorption capacity of BPC on g‐C 3 N 4 sheets with larger specific surface area 22 . However, the degradation efficiency of the composites exhibits a decreasing trend with the addition dosage of TAP, indicating that the excessive introduction of TAP may collapse the structure of g‐C 3 N 4 , then the specific surface area and pore structure of the composites are decreased, which reduce adsorption and photocatalytic degradation performance of OTC.…”

“…Based on the above analysis, a possible mechanism of the OTC removal by XTAP‐BPC/CN composite was proposed. First, the BPC loaded on g‐C 3 N 4 served as an active site to efficiently adsorb and enrich OTC molecules, then the rate of the photocatalytic reaction was accelerated 22 . Besides, the introduction of TAP reduced the bandgap of the material and enhanced the electrical conductivity, which fine tuned the internal electronic properties of the material, assisted the photogenerated carriers to reach the active site rapidly, and then enhanced the separation efficiency of photogenerated carriers.…”

“…At present, supplying more photocatalytic reactive sites by doping porous carbon to increase the specific surface area has been considered as an effective way to improve the photocatalytic activity of g‐C 3 N 4. 19–21 Moreover, our previous work also revealed that biomass porous carbon (BPC) supported on g‐C 3 N 4 can increase the specific surface area and reaction sites, resulting in the transfer of photogenic electron–hole pairs, which enhanced the catalytic performance 22 . However, the solution of the low charge transfer rate mainly depends on fine‐tuning the internal electronic structure of g‐C 3 N 4 , the photocatalytic performance of g‐C 3 N 4 was improved by reducing the band gap and the recombination rate of electron–hole pairs 23 .…”

“…[19][20][21] Moreover, our previous work also revealed that biomass porous carbon (BPC) supported on g-C 3 N 4 can increase the specific surface area and reaction sites, resulting in the transfer of photogenic electron-hole pairs, which enhanced the catalytic performance. 22 However, the solution of the low charge transfer rate mainly depends on fine-tuning the internal electronic structure of g-C 3 N 4 , the photocatalytic performance of g-C 3 N 4 was improved by reducing the band gap and the recombination rate of electron-hole pairs. 23 Meanwhile, the g-C 3 N 4 is composed of the N-bridged tri-s-triazine repeating units, and formed π-conjugated graphitic plane.…”