Study on the adsorption of carbamazepine by zero valent iron doped carbon nitride in water

Zero valent iron doped carbon nitride （Fe@N/C） was synthesized to address the shortcomings of insufficient adsorption performance and poor solid-liquid separation performance of traditional carbon materials. Compared to carbon nitride （N/C）， Fe@N/C had a higher BET surface area， pore volume and pore size， facilitating the exposure of N- and O-contained active sites， as well as the adsorption of pollutants. Carbamazepine （CBZ） was selected as the target pollutant， and the effect of solution pH， adsorption time and pollutant concentration on the adsorption performance of Fe@N/C was studied in detail. The results indicated that CBZ could be adsorbed onto Fe@N/C in a wide pH range. The adsorption process conformed to the pseudo-second order kinetic model and Langmuir isothermal model. The maximum adsorption capacity of Fe@N/C obtained by fitting with Langmuir isothermal model reached to 56.88 mg/g. Fe@N/C exhibited good reusability， and the adsorbent can be quickly separated from water using a magnet after adsorption. The adsorption mechanism indicated that CBZ was adsorbed onto Fe@N/C through π-π electron donor acceptor interactions and hydrogen bonding.