One-pot preparation of magnetic nitrogen-doped porous carbon from lignin for efficient and selective adsorption of organic pollutants

Abstract

Efficient and rapid capture of organic pollutants from wastewater is an urgent problem to be solved by adsorbents. Nitrogen-doped magnetic porous carbon (M-PLAC) with three-dimensional porous structure was synthesized from lignin to adsorb MB and TC in wastewater. M-PLAC had high specific surface area (1252.21 m2/g) and N element content (7.44%). The calculated equilibrium adsorption amount by M-PLAC for MB and TC was 645.52 and 1251.09 mg/g, respectively. The adsorption of MB and TC on M-PLAC conformed to the pseudo-second-order kinetic model, demonstrating that the adsorption process was attributed to chemisorption. The excellent adsorption performance was a synergistic effect among various adsorption mechanisms. The removal of MB and TC by M-PLAC showed fast and efficient characteristics, and exhibited high selectivity for TC in binary system. In addition, M-PLAC was suitable for a variety of complex water environments and had good regeneration performance, demonstrating potential advantages in practical wastewater treatment.