School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China.
School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China.
Bioresour Technol. 2013 Oct;146:803-806. doi: 10.1016/j.biortech.2013.08.020. Epub 2013 Aug 14.
A woody biochar which was the byproduct of gasification of sawdust was treated with bioleaching by Acidithiobacillus ferrooxidans. After bioleaching, most heavy metal was removed from biochar. Leaching efficiency of heavy metal was efficient in a wide pulp density range from 1% to 10% (w/v) and decreased only a little with the increase in pulp density. It made application of biochar free of heavy metal risk. Benefitting from the improvement in functional group composition and pore structure after bioleaching, adsorption capacity of biochar to methylene blue and heavy metal was enhanced greatly. Adsorption of methylene blue could be described by pseudo-second-order model and Langmuir equation and the enhancement was mainly caused by the modification of physical character of biochar. Adsorption of heavy metal could be described by Freundlich equation and was mainly determined by chemical character of biochar.
一种木质生物炭，是锯末气化的副产品，用嗜酸氧化亚铁硫杆菌进行了生物沥滤处理。生物沥滤后，生物炭中大部分重金属被去除。在 1%至 10%（w/v）的宽纸浆密度范围内，重金属的浸出效率很高，仅略有下降，随着纸浆密度的增加而略有下降。这使得生物炭的应用没有重金属风险。生物沥滤后，由于功能基团组成和孔结构的改善，生物炭对亚甲基蓝和重金属的吸附能力大大增强。亚甲基蓝的吸附可以用伪二级模型和朗缪尔方程来描述，这种增强主要是由于生物炭物理性质的改变。重金属的吸附可以用弗伦德利希方程来描述，主要取决于生物炭的化学性质。
