Quan Chen,Xiangmei Cheng,ShengSheng Liu,Dichen Xia,Yan Liu,Zhen Zhang,Pengcheng Gu
Biochar materials with low cost and desired properties have gradually been widely applied in multitudinous domains, especially in radioactive wastewater remediation. Multi-heteroatom doping is a useful method for the design of doping biochar with uranium immobilization of excellent performance. Herein, multi-heteroatom self-doped microporous carbon was designed and synthesized via extraction and carbonization of collagen by potassium compound assisted, which was extracted by low-cost fish scales as the precursor and tested for high-performance uranium immobilization . The multi-heteroatom self-doped biochar exhibited the maximum saturated adsorption capacity of 142.06 mg/g for U(VI) at pH = 5, reflecting the significant increase in available adsorption sites from multi-heteroatom doped. The strong complexation process was proposed for the mutual effect between U(VI) and multi-heteroatom doped biochar, where abundant functional groups (oxygen and amino) and sulfur metal sites groups were the primary active sites. The design of multi-heteroatom self-doped biochar provided a universal and effective method for purifying U(VI) from wastewater systems.
Peng Lyu,Guanghui Wang,Yelin Cao,Bing Wang,Nansheng Deng
The decommissioning of uranium mill tailings (UMTs) is usually accompanied by uranium (U) contamination in soil, which poses a serious threat to human health and ecological safety. In this study, a novel phosphorus-modified bamboo biochar (PBC) cross-linked Mg–Al layered double-hydroxide (LDH) composite (“PBC@LDH”) was successfully prepared by phosphate pre-impregnation and a hydrothermal method with Mg–Al LDH. Physicochemical analysis revealed that phosphorus-containing functional groups and Mg–Al LDH were grafted onto the pristine biochar (BC) matrix. Laboratory-scale incubation and column leaching experiments were performed on the prepared BC, PBC, and PBC@LDH. The results showed that, at a dosage of 10%, the PBC@LDH composite had a commendable ability to immobilize U in soil. After 40 days of incubation with the stabilizer, the more mobile U was converted into immobilized species. Furthermore, during a column leaching experiment with simulated acid rain, the cumulative loss and leaching efficiency of U were remarkably reduced by PBC@LDH treatment compared with the control, reaching 53% and 54%, respectively. Surface complexation, co-precipitation, and reduction described the adsorption and immobilization mechanisms. In conclusion, this research demonstrates that the PBC@LDH composite offers a potentially effective amendment for the remediation of U contaminated soil.
危险品化学品经营许可证（带存储）