Recovery of U(VI) from uranium-associated coal mine wastewater by microwave irradiation-modified Photinia × fraseri Dress biochar
摘要
Developing efficient adsorbents is key to mitigate radioactive contamination in coal mine wastewater and improve uranium extraction. This study processed local Photinia × fraseri Dress into biochar via high-temperature carbonization. Microwave irradiation yielded modified biochar, then treated under alkaline conditions and dilute sulfuric acid to produce PDC-M-K and PDC-M-H. The study found that PDC-M-K and PDC-M-H had U(VI) adsorption capacities of 79.6 and 116.3 mg U/g ads, with utilization rates of 69.3% and 75.6%, respectively. Their adsorption selectivity for U(VI) was 66.5% and 72.8%. Indicating that modified biochar effectively adsorbs U(VI) from wastewater, providing a reference for future studies.