摘要
To efficiently remove organic pollutants from wastewater combined with a disinfection effect, using activated biochar (ACB) as substrate, ACB-Ag 3 PO 4 and ACB-Ag 6 Si 2 O 7 composite photocatalysts were prepared via the in-situ co-precipitation method. The structure, morphology, physicochemical, and optical properties were characterized by advanced techniques, and the adsorption-photodegradation effects on tetracycline (TC), chloramphenicol (CAP), and rhodamine B (RhB) were investigated. The results revealed that ACB-Ag 3 PO 4 and ACB-Ag 6 Si 2 O 7 with heterojunction were successfully synthesized, and their optimum loading ratios were 1:1 and 1:2, respectively. The removal rates of ACB-Ag 3 PO 4 and ACB-Ag 6 Si 2 O 7 for TC were 98.48% and 91.87%, 95.88% and 85.23% for CAP, 99.13% and 83.54% for RhB, respectively, and also much higher than those of pure Ag 3 PO 4 and Ag 6 Si 2 O 7 . Moreover, the degradation efficiency and mineralization rate of ACB-Ag 3 PO 4 were higher than those of ACB-Ag 6 Si 2 O 7 for all pollutants. Further, both composites maintained about a 99% sterilization rate against both S. aureus and E. coli at 48 h. These were attributed to the introduction of ACB, which enriched the elemental composition of Ag-based semiconductors and increased the specific surface area and visible light absorption. Importantly, the composites narrow the bandgap energy and optimize energy band structure, and the special structure of ACB facilitated the photocatalytic activity . Moreover, possible photogenerated carrier transfer paths of the two composites are either type-II or Z-scheme, and the performance differences are related to the photogenerated carriers, absorbance, and microstructure. ACB-Ag 3 PO 4 is more recommended for environmental applications given its better photostability and reusability than ACB-Ag 6 Si 2 O 7 , and its removal of TC and RhB from actual wastewater exceeded 61.39% and 86.62%, respectively.
危险品化学品经营许可证（带存储）