Adsorption of chlortetracycline onto biochar derived from corn cob and sugarcane bagasse

Abstract

Biochar was prepared from two different types of biological waste materials, corn cob (CC) and sugarcane bagasse (SB). The adsorption capacity of each class of adsorbent was determined by chlortetracycline (CTC) adsorption tests. The adsorption kinetics and isotherms of chlortetracycline onto sugarcane bagasse biochar (SBB) and corn cob biochar (CCB) were studied. Experimental results indicated that pseudo-second-order adsorption kinetics of CTC onto SBB and CCB were more reasonable than pseudo-first-order kinetics, and the adsorption kinetic model of CTC onto SBB was slightly better than that onto CCB. The maximum adsorption capacity of CTC onto SBB was 16.96 mg/g at pH 4, while the highest adsorption efficiency of CTC onto CCB was achieved at pH 5 with a maximum adsorption of 12.39 mg/g. The Freundlich isotherm model was better than the Langmuir model at illustrating the adsorption process of CTC onto SBB and CCB. These results provide a way to understand the value of specific biochars, which can be used as efficient and effective adsorbents for CTC removal from waste-water. Compared with raw pinewood, SBB and CBB were considered as alternative materials to remove antibiotics from aqueous environments.

Engineered biochar – A sustainable solution for the removal of antibiotics from water

“…The adsorbed CTC amount onto BC-SB was ~30% more that onto BC-SS; likewise, it depended on solution pH due to the amphoteric structure of the CTC molecule. The Qmax values were found in the pH range 4-5, at which the CTC molecule is not charged, i.e., where there were no electrostatic interactions between the drug and the BC surface [141]. Under such conditions, analogous to the case for TC (characterized by a similar molecular structure), one can expect the dominance of π-π EDA interactions and the presence of hydrogen bonds [133,134].…”

“…Zhang et al [141] compared the adsorption of chlortetracycline (CTC) onto BCs produced from corncob (BC-CC) and sugarcane bagasse (BC-SB). These BCs showed a large difference in porosity.…”

Honeycomb-like MnO2/Biochar Catalyst Fabricated by High-Energy Electron Beam Irradiation for Degradation of Antibiotics in Swine Urine

“…The issue of antibiotics is a key constraint to the sustainable development of ecological and breeding industry. As a typical antibiotic, chlortetracycline (CTC) has been widely used as a growth promoter and antimicrobial agent in pig farms worldwide, due to its broad-spectrum property and low cost [ 1 ]. However, excessive intake of CTC in pigs can lead to high levels of CTC and metabolites in pig urine.…”