生物炭
多孔性
碳纤维
化学
化学工程
环境化学
材料科学
复合数
热解
复合材料
有机化学
工程类
作者
Wei-Feng Chen,Ran Wei,Liuming Yang,Yusheng Yang,Guangpo Li
标识
DOI:10.1016/j.scitotenv.2018.10.141
摘要
Ash in biochar has great influence on the characteristics of biochars. This study systematically compared the differences in physico-chemical properties between pristine biochars (PBCs) and deashed biochars (DBCs) produced at different temperatures (300-900 °C), and specifically analyzed their different advantages in environmental applications. In terms of all the PBCs and DBCs, PBC of 900 °C and the corresponding DBC have the highest degree of graphitization that is recalcitrant in environment, they are benefit for carbon sequestration. PBC of 300 °C and the corresponding DBC have the highest content of O-containing functional groups and aliphaticity that is labile in environment, they are potential carbon source for the growth of soil organisms. PBCs of 300-400 °C have the greatest releasable PO43- content (0.418-0.441 mg/g), and PBCs of 700-900 °C have highest pH (9.28-9.59) and mineral elements content (11.58-12.64 mg/g), they are potential provision of P, and acid soil amendments with potential provision of mineral elements, respectively. DBCs of 300-400 °C possess less competitive cations including Ca, Mg, Al, Fe, and Zn (1.49-2.01 mg/g) and highest content of O-containing functional groups, they are good sorbents for heavy metals, meanwhile these DBCs have the lowest pH (4.49-4.70) that are potential amendments for alkaline soil. Moreover, DBCs of 900 °C have the highest surface area (SA) (351 m2/g), the most developed porosity, and the highest releasable NH4+ content (0.052 mg/g), they are good sorbents for hydrophobic organic pollutants and potential provision of N. This study gives an effective guidance for selecting the suitable biochars-design (deashing or non-deashing) according to their applications in environment.
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