Study on Preparation and Properties of TiO2/Biochar by Phosphoric Acid Modifition

Abstract

In this study, phosphoric acid was proposed as an activator to mix and activate the biomass and tetrabutyl titanate, and the parameters were adjusted to obtain the optimum conditions for the preparation of photocatalysts. The specific surface area of the composite photocatalysts prepared under the high ratio (phosphoric acid: peanut shell = 2:1) of phosphoric acid modification was obtained to be 317 m2·g-1, with an average pore size of 32 nm and a large number of hydrophilic groups on the surface of the material to improve hydrophilicity. The results showed that the adsorption and degradation of methylene blue by the one-step modified composite photocatalyst was 102.5 mg/g, and the adsorption-degradation efficiency reached 99.4%, which had excellent water treatment effect and improved the application possibility of the composite photocatalyst in water treatment.