ABSTRACT
Using coconut shell and boric acid as raw materialsï¼ a new boron-doped coconut shell mesoporous carbon material ï¼B-CSCï¼ was prepared using a simple one-step pyrolysis method for efficient adsorption and removal of tetracycline pollutants in water. The effects of pyrolysis temperature and boron-carbon mass ratio on the adsorption performance under key preparation conditions were systematically studiedï¼ and their microstructure and physicochemical properties were characterized using a specific surface area and pore size analyzer ï¼BETï¼ï¼ field emission scanning electron microscopy ï¼SEMï¼ï¼ X-ray photon spectroscopy ï¼XPSï¼ï¼ Raman spectrometer ï¼Ramanï¼ï¼ and Zeta potentiometer ï¼Zetaï¼. The effects of initial pHï¼ different metal cationsï¼ and different background water quality conditions on the adsorption effect were systematically investigated. Combined with material characterization and correlation analysisï¼ the enhanced adsorption mechanism was discussed and analyzed in depth. The results showed that one-step pyrolysis could incorporate boron into the surface and crystal lattice of coconut shell charcoalï¼ resulting in a larger specific surface area and pore volumeï¼ and the main forms of boron introduced were H3BO3ï¼ B2O3ï¼ Bï¼ and B4C. The adsorption capacity of B-CSC to tetracycline reached 297.65 mg·g-1ï¼ which was 8.9 times that of the original coconut shell mesoporous carbon ï¼CSCï¼. At the same timeï¼ the adsorption capacity of B-CSC for rhodamine B ï¼RhBï¼ï¼ bisphenol Aï¼BPAï¼ï¼ and methylene blue ï¼MBï¼ï¼ common pollutants in aquatic environmentsï¼ was as high as 372.65ï¼ 255.24ï¼ and 147.82 mg·g-1ï¼ respectively. The adsorption process of B-CSC to tetracycline was dominated by physicochemical interactionï¼ mainly involving liquid film diffusionï¼ surface adsorptionï¼ mesoporous and microporous diffusionï¼ and active site adsorptionï¼ and H3BO3 was the main adsorption site. The adsorption strengthening mechanism mainly reduced the chemical inertness of the carbon network and enhanced its π-π interaction and hydrogen bonding with tetracycline molecules.