Abstract:In this paper, bagasse was used as raw material to produce biochar with adsorption properties by optimizing the calcination conditions, and magnesium oxide-modified biochar was prepared by introducing magnesium salt. The biochar was characterized by Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS), X-ray Diffraction (XRD), Infrared Spectroscopy (FT-IR) and Specific Surface area and Porosity Analyzer(BET).The adsorption rate on ferulic acid sucrose solution was used as the evaluation index to explore the four one-factor adsorption conditions: solution pH, adsorption temperature, adsorption time, and adsorbent dosage. Adsorption kinetic model and thermodynamic model experiments were used to fit the data and explore the adsorption behavior. The results showed that the best adsorption performance of the biochar produced at a carbonization temperature of 600℃ and a carbonization time of 2 h; SEM; EDS, XRD, FT-IR and BET showed that the surface of the biochar was successfully loaded with magnesium and the pore structure has changed greatly, with large specific surface area and void ratio, and strong adsorption capacity; the best conditions measured in the one-way experiment were pH 5.5, temperature 75℃, stirring time 120 min, and adsorbent dosage 150.00 mg; the adsorption rate of modified biochar on ferulic acid sucrose solution was 42.01%, which is a big improvement compared with the adsorption rate of unmodified biochar 29.01% and that of the macroporous resin 22.09%, and the adsorption behavior was dominated by the chemical adsorption of the multimolecular layer. Thus, magnesium oxide-modified biochar has a certain application prospect as a scavenger in the sugar juice clarification process.
