College of Environmental Science and Engineering, Hunan University, 410082, Changsha, People's Republic of China.
Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, 410082, Changsha, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Jan;26(2):1962-1972. doi: 10.1007/s11356-018-3772-6. Epub 2018 Nov 20.
Chemical treatment could improve the adsorption performance of biochars (BC). In order to deal with Pb(II) pollution, four types of biochars including unmodified, acid-treated, alkali-treated, and magnetic-treated pig manure-derived biochars (PBCs) were prepared. The effect of chemical treatment on the physical property, chemical composition, and the adsorption behavior of biochars was compared. Magnetic and alkali treatment improved pore volume and specific surface areas, and the adsorption capacity and rates were enhanced. In contrast, the adsorption capacity of acid-treated BC decreased due to the significant decrease of ash content. The magnetic samples displayed the satisfactory absorption performance, which could achieve 99.8% removal efficiency within 15 min at a Pb(II) concentration of 50 mg/L. Considering its properties of excellent adsorption performance, fast reaction rate, and convenient recovery by an external magnetic field, magnetic biochar based on pig manure may provide an effective way to remove heavy metals and decrease the pig manure solid waste.
化学处理可以改善生物炭（BC）的吸附性能。为了处理 Pb(II) 污染，制备了四种类型的生物炭，包括未改性、酸处理、碱处理和磁处理猪粪衍生生物炭（PBC）。比较了化学处理对生物炭物理性质、化学组成和吸附行为的影响。磁处理和碱处理提高了孔体积和比表面积，吸附容量和速率得到了增强。相比之下，由于灰分含量的显著减少，酸处理的 BC 的吸附容量降低。磁性样品表现出令人满意的吸收性能，在 Pb(II)浓度为 50mg/L 时，在 15 分钟内可以达到 99.8%的去除效率。考虑到其优异的吸附性能、快速的反应速率以及通过外部磁场方便回收的特性，基于猪粪的磁性生物炭可能为去除重金属和减少猪粪固体废物提供了一种有效途径。
