In this study, bamboo charcoal was prepared from waste generated during bamboo pulp preparation by phosphoric acid activation method, and then bamboo charcoal/BiOCl composite catalysts were subsequently synthesized via hydrothermal method, and the effects of dosage of bamboo charcoal and hydrothermal temperature on the photocatalytic properties of the composite catalysts were systematically investigated. The results showed that the bamboo charcoal retained the inherent pore structure of bamboo, and changing the dosage of bamboo charcoal could achieve the modulation of the morphology of the bamboo charcoal/BiOCl composite catalyst, which provided a good condition for pollutant adsorption. The pronounced interactions occurring between bamboo charcoal and BiOCl significantly improved the adsorption-photocatalytic performance and oxygen vacancy content of BiOCl, so that the efficiency of photogenerated electron transfer was enhanced and the photocatalytic degradation of the composite catalyst was optimised.
The composite catalyst 5BC-140 observed at the hydrothermal temperature of 140 ℃ and bamboo charcoal dosage of 5% showed the optimal visible photocatalytic properties, with the removal rate of rhodamine B reaching 86.5% within 30 min, the one-mediated kinetic constant k being 4.2 times that of BiOCl, and excellent stability and recyclability.