Tan Xiaofei, Liu Yunguo, Gu Yanling, Zeng Guangming, Wang Xin, Hu Xinjiang, Sun Zhichao, Yang Zhongzhu
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.
Environ Sci Pollut Res Int. 2015 Aug;22(16):12597-604. doi: 10.1007/s11356-015-4523-6. Epub 2015 Apr 25.
Biochars derived from bamboo, coconut shell, pine wood shavings, and sugarcane bagasse were applied into Ultisol to investigate their effects on Cd(II) immobilization. After 360 days of incubation, the physical/chemical properties of the Ultisol were improved by the addition of different biochars. As a result, the maximum adsorption capacities of soil for Cd(II) were increased from 8.02 to 9.07-11.51 mmol/kg, and bamboo biochar showed the highest effect on Cd(II) immobilization. The Langmuir model (R(2) > 0.983) fitted the data better than the Freundlich model (R (2) were 0.902-0.937). Column leaching experiments suggested that biochar can also increase the immobilization of Cd(II) under leaching conditions. Biochar mainly increased the weak/unstable binding force of Cd(II) by soil, such as ion exchange, electrostatic attraction, physical adsorption, and carbonate precipitation. In addition, a significant enhancement of surface complexation was also observed.
将源自竹子、椰壳、松木刨花和甘蔗渣的生物炭施用于老成土，以研究它们对镉（II）固定的影响。培养360天后，添加不同生物炭改善了老成土的物理/化学性质。结果，土壤对镉（II）的最大吸附容量从8.02增加到9.07 - 11.51 mmol/kg，竹生物炭对镉（II）固定的效果最为显著。与弗伦德利希模型（R²为0.902 - 0.937）相比，朗缪尔模型（R² > 0.983）对数据的拟合效果更好。柱淋溶实验表明，生物炭在淋溶条件下也能增加镉（II）的固定。生物炭主要增加了土壤对镉（II）的弱/不稳定结合力，如离子交换、静电吸引、物理吸附和碳酸盐沉淀。此外，还观察到表面络合作用显著增强。
