Unassisted solar lignin valorisation using a compartmented photo-electro-biochemical cell
Unassisted solar lignin valorisation using a compartmented photo-electro-biochemical cell
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DOI：
10.1038/s41467-019-13022-7
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发表时间：
2019-11-12
影响因子：
16.6
通讯作者：
Jang, Ji-Wook
中科院分区：
文献类型：
--
作者：
Ko, Myohwa;Le Thanh Mai Pham;Jang, Ji-Wook
木质素是木质纤维素生物质的主要成分。尽管它很难分解，但它是有价值的芳香碳的非常丰富的天然来源。因此，木质素的有效增值对于实现可持续的生物精炼链至关重要。在这里，我们报告了一种用于无辅助、选择性和稳定的木质素增值的分室光电生化系统，其中集成了 TiO2 光催化剂、原子分散的钴基电催化剂和生物催化剂（木质素过氧化物酶同工酶 H8、辣根过氧化物酶），以便使用 Nafion 和纤维素膜分离每个系统。这种电池设计能够在阳光照射下实现木质素的增值，而无需任何额外的偏压或牺牲剂，并且可以保护生物催化剂免受酶破坏元素（例如反应性自由基、气泡和光）的影响。该光电生化系统能够以 98.7% 的选择性催化木质素解聚，并使用松柏醇（一种木质素单体）催化聚合，收率 73.3%。
Lignin is a major component of lignocellulosic biomass. Although it is highly recalcitrant to break down, it is a very abundant natural source of valuable aromatic carbons. Thus, the effective valorisation of lignin is crucial for realising a sustainable biorefinery chain. Here, we report a compartmented photo-electro-biochemical system for unassisted, selective, and stable lignin valorisation, in which a TiO2 photocatalyst, an atomically dispersed Co-based electrocatalyst, and a biocatalyst (lignin peroxidase isozyme H8, horseradish peroxidase) are integrated, such that each system is separated using Nafion and cellulose membranes. This cell design enables lignin valorisation upon irradiation with sunlight without the need for any additional bias or sacrificial agent and allows the protection of the biocatalyst from enzyme-damaging elements, such as reactive radicals, gas bubbles, and light. The photo-electrobiochemical system is able to catalyse lignin depolymerisation with a 98.7% selectivity and polymerisation with a 73.3% yield using coniferyl alcohol, a lignin monomer.