Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
Environ Sci Technol. 2012 Jul 17;46(14):7849-56. doi: 10.1021/es204681y. Epub 2012 Jun 28.
Heavy-metal-polluted biomass derived from phytoremediation or biosorption is widespread and difficult to be disposed of. In this work, simultaneous conversion of the waste woody biomass into bio-oil and recovery of Cu in a fast pyrolysis reactor were investigated. The results show that Cu can effectively catalyze the thermo-decomposition of biomass. Both the yield and high heating value (HHV) of the Cu-polluted fir sawdust biomass (Cu-FSD) derived bio-oil are significantly improved compared with those of the fir sawdust (FSD) derived bio-oil. The results of UV-vis and (1)H NMR spectra of bio-oil indicate pyrolytic lignin is further decomposed into small-molecular aromatic compounds by the catalysis of Cu, which is in agreement with the GC-MS results that the fractions of C7-C10 compounds in the bio-oil significantly increase. Inductively coupled plasma-atomic emission spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy analyses of the migration and transformation of Cu in the fast pyrolysis process show that more than 91% of the total Cu in the Cu-FSD is enriched in the char in the form of zerovalent Cu with a face-centered cubic crystalline phase. This study gives insight into catalytic fast pyrolysis of heavy metals, and demonstrates the technical feasibility of an eco-friendly process for disposal of heavy-metal-polluted biomass.
受重金属污染的植物修复或生物吸附生物质广泛存在且难以处理。在这项工作中，研究了在快速热解反应器中同时将废弃木质生物质转化为生物油和回收铜。结果表明，铜可以有效地催化生物质的热分解。与未经污染的冷杉锯末生物质（FSD）衍生的生物油相比，Cu 污染的冷杉锯末生物质（Cu-FSD）衍生的生物油的产率和高热值（HHV）都有显著提高。生物油的 UV-vis 和（1）H NMR 光谱结果表明，在 Cu 的催化作用下，热解木质素进一步分解成小分子芳香族化合物，这与 GC-MS 结果一致，即生物油中 C7-C10 化合物的分数显著增加。电感耦合等离子体原子发射光谱、X 射线衍射和 X 射线光电子能谱分析表明，Cu-FSD 中超过 91%的总 Cu 以面心立方晶相的零价 Cu 的形式富集在焦炭中。这项研究深入了解了重金属的催化快速热解，并展示了一种处理重金属污染生物质的环保工艺的技术可行性。
