利用猪粪生物炭从废水中高效去除铀：了解吸附和结合机制。
Efficient removal of uranium from wastewater using pig manure biochar: Understanding adsorption and binding mechanisms.
作者信息
Liao Jun, Ding Ling, Zhang Yong, Zhu Wenkun
机构信息
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China; Division of Target Science and Fabrication, Research Center of Laser Fusion, China Academy of Engineering Physics, P. O. Box 919-987, Mianyang 621900, China.
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China.
出版信息
J Hazard Mater. 2022 Feb 5;423(Pt B):127190. doi: 10.1016/j.jhazmat.2021.127190. Epub 2021 Sep 11.
In this work, three kinds of biochars (PMBC-HO, PMBC-PP and PMBC-HP) with excellent adsorption performance were obtained by carbonizing pig manure pre-treated with different agents. These biochars had the ordered mesoporous structures and possessed abundant active functional groups on their surface. The adsorption behaviors of the biochars towards U under various conditions were evaluated by batch experiment. The results showed that KMnO and HO could enormously improve the adsorption performance of PMBC to U. After KMnO and HO pretreatment, the maximum adsorption capacities of PMBC-PP (979.3 mg/g) and PMBC-HP (661.7 mg/g) were about 2.6 and 1.8 times higher than that of PMBC-HO (369.9 mg/g), respectively, which was much higher than previously reported biochar-based materials. Obviously, KMnO pretreatment leaded to a higher enhancement than that of HO. The removal mechanism of U on PMBC-PP was discussed in-depth. The interaction between U species and PMBC-PP was mainly ascribed to the abundant active sites on the surface of PMBC-PP. In a word, conversion of pig manure pre-treated with KMnO into biochar not only demonstrates that PMBC-PP has great potential in the treatment of actual uranium-containing wastewater, but also provides a method for the rational utilization of pig manure to reduce the pollution.
在这项工作中，通过碳化用不同试剂预处理的猪粪获得了三种具有优异吸附性能的生物炭（PMBC-HO、PMBC-PP和PMBC-HP）。这些生物炭具有有序的介孔结构，并且在其表面拥有丰富的活性官能团。通过批量实验评估了生物炭在各种条件下对铀的吸附行为。结果表明，KMnO₄和H₂O₂能极大地提高PMBC对铀的吸附性能。经过KMnO₄和H₂O₂预处理后，PMBC-PP（979.3 mg/g）和PMBC-HP（661.7 mg/g）的最大吸附容量分别比PMBC-HO（369.9 mg/g）高约2.6倍和1.8倍，这远高于先前报道的基于生物炭的材料。显然，KMnO₄预处理导致的增强效果比H₂O₂更高。深入探讨了铀在PMBC-PP上的去除机制。铀物种与PMBC-PP之间的相互作用主要归因于PMBC-PP表面丰富的活性位点。总之，将用KMnO₄预处理的猪粪转化为生物炭不仅表明PMBC-PP在处理实际含铀废水方面具有巨大潜力，而且为合理利用猪粪以减少污染提供了一种方法。
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