One-pot preparation of layered double oxides-engineered biochar for the sustained removal of tetracycline in water

Tetracycline (TC) and sugarcane bagasse had both exerted enormous strain on environmental security. In this work, new composite adsorbent designed by impregnating bio-waste bagasse with magnesium-aluminum layered double oxides (BC-MA) was innovatively brought forward for TC removal. Benefiting from the abundant adsorption sites supplied by developed pores structure (0.308 cm(3).g(-1)), enlarged surface area (256.8 m(2).g(-1)) and reinforced functional groups, the maximum adsorption amount of BC-MA for TC reached 250.6 mg g(-1). Moreover, BC-MA displayed desirable adsorption capacity in diverse water environments coupled with excellent sustainable regeneration ability. The absorption process of TC by BC-MA was spontaneous and endothermic, and the pivotal rate-limiting stage pertained to intraparticle diffusion. The mechanisms proposed here mainly concerned pi-pi interactions, pore filling, complexation and hydrogen bonding. These findings suggested that the synthesis of modified biochar from bagasse would offer new opportunities for simultaneous waste resource reuse and water pollution control.

Automated summary

In this study, a new composite adsorbent (BC-MA) was developed by impregnating bio-waste bagasse with magnesium-aluminum layered double oxides for the removal of tetracycline (TC). BC-MA exhibited a high adsorption capacity of 250.6 mg g(-1) due to its developed porous structure, large surface area, and reinforced functional groups. BC-MA showed excellent adsorption capacity in diverse water environments and sustainable regeneration ability. The adsorption process of TC by BC-MA was spontaneous and endothermic, and intraparticle diffusion was the rate-limiting stage. The proposed mechanisms involved pi-pi interactions, pore filling, complexation, and hydrogen bonding. These findings suggest that the synthesis of modified biochar from bagasse offers new opportunities for waste resource reuse and water pollution control.