Although the preparation of carbon composites has made great progress, the construction of systems comprising uniformly dispersed carbon as a framework to link active constituents still remains a challenge. Herein, a hierarchical Fe2 O3 /C composite was synthesized in a one-step biotemplating route, where agarose was firstly reacted with Fe3+ and Ca2+ ions, which resulted in a competitive interaction between these ions and the hydroxy groups, then partly calcined to achieve the final product that consisted of α-Fe2 O3 nanoparticles embedded in highly dispersed carbon. The carbon within the composite acts as an efficient photoelectron transfer channel to improve conductivity during photocatalysis. The hierarchical Fe2 O3 /C composite exhibited a photodegradation rate constant (k) of 0.091 min-1 , more than four times that of α-Fe2 O3 (0.020 min-1 ).

中文翻译：

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高度分散的碳作为电子转移通道合成Fe2 O3的生物模板路线。

尽管碳复合材料的制备取得了很大进展，但是构建包含均匀分散的碳作为连接活性成分的骨架的体系仍然是一个挑战。本文以一步一步的生物模板法合成了分级的Fe2 O3 / C复合材料，其中琼脂糖首先与Fe3 +和Ca2 +离子反应，导致这些离子与羟基之间发生竞争性相互作用，然后部分煅烧以实现最终产品由嵌入高度分散的碳中的α-Fe2O3纳米颗粒组成。复合材料中的碳可作为有效的光电子传输通道，以提高光催化过程中的电导率。Fe2 O3 / C层状复合材料的光降解速率常数（k）为0.091 min-1，是α-Fe2O3（0.020 min-1）的四倍以上。