With Fe(NO₃)₃·9H₂O and Bi(NO₃)₃·5H₂O as raw materials, different sillenite-type compounds and elemental bismuth were prepared by a facile one-pot solvothermal method using H₂O, C₂H₅OH, (CH₂OH)₂ and C₃H₈O₃ as solvents, respectively. The structure, morphology, elemental compositions and properties of samples were examined by XRD, SEM, TEM, ICP, XPS, N₂ adsorption and desorption, UV-vis DRS and PL. The photocatalytic activities of different samples were evaluated by the photodegradation of RhB under visible-light irradiation (λ > 400 nm), and results show that Bi₃₆Fe₂O₅₇ prepared using C₂H₅OH as the solvent owns the optimum performance. In order to explore the reaction mechanism, an additional experiment was designed to investigate the main active species during the photodegradation process via dissolving different trapping agents in the reaction solution before light irradiation. The results show that superoxide radical anions play a major role in this system since the RhB degradation was significantly suppressed after the addition of benzoquinone.

以Fe（NO ₃）₃ ·9H ₂ O和Bi（NO ₃）₃ ·5H ₂ O为原料，通过H ₂ O，C简便的一锅溶剂热法制备了不同的亚硅酸盐型化合物和元素铋。₂ H ₅ OH，（CH ₂ OH）₂和C ₃ H ₈ O ₃分别作为溶剂。通过XRD，SEM，TEM，ICP，XPS，N ₂检验了样品的结构，形态，元素组成和性能。吸附和解吸，紫外可见DRS和PL。通过在可见光（λ> 400 nm）下对RhB的光降解来评估不同样品的光催化活性，结果表明，以C ₂ H ₅ OH为溶剂制备的Bi ₃₆ Fe ₂ O ₅₇具有最佳性能。为了探索反应机理，设计了另外的实验来研究光降解过程中的主要活性物质，方法是在光照射前将不同的捕获剂溶解在反应溶液中。结果表明，超氧自由基阴离子在该系统中起主要作用，因为在添加苯醌后，RhB的降解得到了显着抑制。