Combining phytoremediation and biorefinery: Metal extraction from lead contaminated Miscanthus during pretreatment using the ionoSolv process
Combining phytoremediation and biorefinery: Metal extraction from lead contaminated Miscanthus during pretreatment using the ionoSolv process
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DOI：
10.1016/j.indcrop.2021.114259
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发表时间：
2022-02
影响因子：
5.9
通讯作者：
L. Hennequin;Sze-yin Tan;Elaine Jensen;Paul S. Fennell;Jason P. Hallett
中科院分区：
文献类型：
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作者：
L. Hennequin;Sze-yin Tan;Elaine Jensen;Paul S. Fennell;Jason P. Hallett
评价了在重金属污染土地上生长的多年生生物能源——芒草原料在生产清洁可再生能源、化工产品和回收金属方面的潜力。微量元素分析表明，收获的芒草中金属污染物含量显著：每千克生物量Pb含量为6.47 g， fe含量为1.91 g， zn含量为0.35 g， Cu含量为26.59 mg kg - 1；与Cr、Ni、As、Cd等金属共同作用，得到1-甲基咪唑氯离子液体[hcim]Cl，从生物质中提取99.3%的Pb， 96-98%的Cu、Zn、Cd，得到洁净的纤维素浆，并成功糖化成葡萄糖，产率为81.5%。pbii在[H1Cim]Cl水溶液中的行为表明，该离子液体介质在−0.9 V电压下支持pbii电化学还原至pb0，电解1 h后，91.5%的Pb从溶液中沉积并回收到电极上。通过溶剂的回收，研究了工艺条件的强化：在第一次预处理后，离子液体液体被回收，铅被电沉积，以清理和管理金属的积聚，为后续的预处理做准备。离子液体液中的电沉积步骤对预处理性能没有负面影响，与未进行电沉积的回收离子液体相比，金属提取率提高了20%。这项研究为将高度金属污染的生物质整合到生物精炼中开辟了新的增值可能性，而不需要焚烧金属污染的生物质。
The potential of perennial bioenergyMiscanthusfeedstock grown on heavy metal contaminated land was evaluated for the production of clean renewable energy, chemicals, and recovered metals. Trace element analysis showed significant levels of metal contaminants from the harvestedMiscanthus: 6.47 g of Pb per kg of biomass, 1.91 g kg−1Fe, 0.35 g kg−1Zn, 26.59 mg kg−1of Cu; along with other metals including Cr, Ni, As and Cd. The protic ionic liquid, 1-methylimidazolium chloride [H1Cim]Cl, extracted 99.3% of Pb from the biomass along with 96–98% of Cu, Zn and Cd, and produced a clean cellulose pulp, which was successfully saccharified into glucose with an 81.5% yield. The behaviour of PbIIin aqueous solutions of [H1Cim]Cl showed that this ionic liquid medium supported the electrochemical reduction of PbIIto Pb0using a voltage of − 0.9 V, depositing and recovering 91.5% of Pb from the solution onto the electrode after 1 h of electrolysis. Intensification of process conditions were studied with recycling of the solvent: after the 1st pretreatment, the ionic liquid liquor was recycled and Pb was electrodeposited to clean-up and manage the build-up of metals for a subsequent pretreatment. The electrodeposition step in the ionic liquid liquor did not have a negative impact on the performance of the pretreatment and metal extraction was enhanced by 20% compared to recycled ionic liquid, which had not gone through any electrodeposition beforehand. This study opens up new valorisation possibilities for the integration of highly metal contaminated biomass into biorefining, without the need to incinerate metal contaminated biomass.