Abstract

ReO₃ were prepared by thermal treatment of the macromolecular Chitosan·(ReCl₃)_X and PSP-4-PVP·(ReCl₃)_X precursors. The plasmon band in the visible region for the as obtained ReO₃ from their visible spectra was observed at λ_max of 640 nm. The nature of the polymeric precursor is acting as a solid state template and influences the size and morphology of the metal oxides. For the first time, the photocatalytic degradation of methylene blue using ReO₃ was measured founding a moderated and high activity for ReO₃ arise from Chitosan and PSP-4-PVP precursors respectively. The inclusion of ReO₃ into SiO₂ was performed using a combined solution of the Chitosan and PVP precursors by the sol–gel method. Subsequent pyrolysis of the solid precursors Chitosan·(ReCl₃)_X(SiO₂)_y and PSP-4-PVP·(ReCl₃)_X.(SiO₂)_y give rise to the nanocomposites ReO₃//SiO₂. The as obtained ReO₃ nanoparticles inside SiO₂ are small as 1 nm. The ReO₃ nanoparticles are distributed uniformly inside the matrix of SiO₂, leading to stable semi porous materials suitable for high temperature catalytic application. The composites ReO₃/SiO₂ exhibit a moderate photocatalytic activity toward the degradation of methylene blue and similar to that of ReO₃.

Graphic Abstract

中文翻译：

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纳米结构ReO 3在二氧化硅基质中的掺入及其对蓝亚甲基光降解的活性

摘要

通过对大分子壳聚糖·（ReCl ₃）_X和PSP-4-PVP·（ReCl ₃）_X前体进行热处理，制备了ReO ₃。从其可见光谱中获得的ReO ₃的可见光区中的等离激元带在640nm的_λmax处观察到。聚合前体的性质充当固态模板，并影响金属氧化物的尺寸和形态。首次测量了使用ReO ₃进行亚甲基蓝的光催化降解，发现分别来自壳聚糖和PSP-4-PVP前体的ReO ₃具有适度和高活性。包含ReO ₃壳聚糖和PVP前体的混合溶液通过溶胶-凝胶法将其转化为SiO ₂。固体前体壳聚糖·（ReCl ₃）_X（SiO ₂）_y和PSP-4-PVP·（ReCl ₃）_X。（SiO ₂）_y的随后热解产生了纳米复合材料ReO ₃ // SiO ₂。所获得的SiO ₂内部的ReO ₃纳米颗粒小至1nm。ReO ₃纳米颗粒均匀地分布在SiO ₂基质内部，导致稳定的半多孔材料适合高温催化应用。复合材料ReO ₃ / SiO ₂对亚甲基蓝的降解表现出中等的光催化活性，与ReO ₃相似。

图形摘要