Department of Earth and Environmental Sciences, Faculty of Science and Engineering, Macquarie University, NSW 2109, Australia.
Department of Earth and Environmental Sciences, Faculty of Science and Engineering, Macquarie University, NSW 2109, Australia.
Bioresour Technol. 2020 Oct;313:123641. doi: 10.1016/j.biortech.2020.123641. Epub 2020 Jun 8.
The metal(loid)-enriched Avicennia marina biomass obtained from phytoremediation was impregnated with two ferric salts (FeCl and Fe(NO)) prior to pyrolysis at 300-700 °C, aiming to study the influence on pyrolytic product properties and heavy metal(loid) deportment. Results showed that the impregnated ferric salts increased the fixed carbon content of biochars, hydrocarbon fractions in bio-oils, and the evolution of CO and H in gases. Cd in biomass could be effectively removed from the biomass by FeCl impregnation. During pyrolysis, the ferric salts enhanced the elemental recovery of As, Cr, Ni and Pb in the biochars and decreased their distribution in gases. Notably, the ferric salt pre-treatment inhibited the mobility and bio-availability of most elements in the biochars. This study indicated that ferric salt impregnation catalysed the pyrolysis process of metal(loid) contaminated biomass, enabled the operation temperature at 500-700 °C with minimal environmental risks, providing a safe and value-added way to the phytoremediation-pyrolysis scheme.
从植物修复中获得的富含金属（类）的海蓬子生物质，在 300-700°C 下进行热解之前，先用两种铁盐（FeCl 和 Fe(NO)）浸渍，目的是研究对热解产物特性和重金属（类）迁移的影响。结果表明，浸渍的铁盐增加了生物炭的固定碳含量、生物油中的碳氢化合物馏分，以及 CO 和 H 在气体中的演化。FeCl 浸渍可有效去除生物质中的 Cd。在热解过程中，铁盐增强了生物炭中 As、Cr、Ni 和 Pb 的元素回收，减少了它们在气体中的分布。值得注意的是，铁盐预处理抑制了生物炭中大多数元素的迁移性和生物可利用性。本研究表明，铁盐浸渍催化了受金属（类）污染的生物质的热解过程，使操作温度在 500-700°C 之间，环境风险最小，为植物修复-热解方案提供了安全和增值的途径。
