COMPARISON OF CHLORAMPHENICOL ADSORPTION BEHAVIOR ON BIOCHARS DERIVED FROM REED STRAWS AND MUNICIPAL SEWAGE SLUDGE

摘要

This work studied the adsorption of chloramphenicol (CAP) on two types of biochars derived from reed straw (RSB) and municipal sewage sludge (SSB), which were prepared by pyrolyzing at 500^. The biochars were characterized by scanning electron microscope, Fourier transform infrared spectroscopy, energy dispersive spectroscopy and Brunauer-Emmet-Teller. It revealed that RSB had a higher surface area (125.04 m2/g) than SSB (7.14 m2/g) and the adsorption of chloramphenicol on SSB (如=1.171 mg/g, 308.15K) was much less than that on RSB (^m=6.586 mg/g, 308.15K). Adsorption kinetics of CAP on biochars followed pseudo second order kinetic model, and adsorption isotherm fitted well with Sips model. The adsorption kinetics and thermodynamics demonstrated that the adsorption of CAP on two biochars squinted towards chemical adsorption. The k-k electro-donor-acceptor interaction between nitro group, benzene ring in CAP and electron on the surface of biochars played an important role in the adsorption of CAP on biochars, while the hydrogen bonding interaction also contributed to the adsorption of CAP on biochars synchronously.