Abstract The purpose of this study was to investigate the correlation between amorphous content and the characteristics of micrometer-sized photocatalyst particles. As a model of photocatalyst, tungsten trioxide (WO3) particles with controllable amorphous contents were used. To comprehend the amorphous content parameter precisely, the experiments were conducted by heating amorphous WO3 powders at a specific temperature without additional chemicals or solvents. Thus, the percentage of amorphous in the WO3 particles was controlled independently in the constant particle outer sizes and morphology. Micrometer-sized catalyst was used to avoid the misleading photocatalytic measurements due to the over-dominancy of other catalytic parameters (such as excessive surface area and quantum confinement effect). The results revealed that in the constant process condition, the photocatalytic properties were strongly dependent on the amorphous content in the catalyst. Decreases in this parameter had a strong influence to the enhancement of the photodecomposition rate of organic material. The tendency for the influence of amorphous content was also confirmed by varying the number of catalysts in the photocatalytic process. The study was also completed with the theoretical consideration for the phenomenon happening during the WO3 crystallization (transformation of amorphous into hexagonal and monoclinic crystal structure) and the photocatalytic process.

中文翻译：

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无定形含量对微米级三氧化钨颗粒光催化性能的影响

摘要 本研究的目的是研究无定形含量与微米级光催化剂颗粒特性之间的相关性。作为光催化剂的模型，使用了具有可控无定形含量的三氧化钨 (WO3) 颗粒。为了准确理解无定形含量参数，实验是通过在特定温度下加热无定形 WO3 粉末而进行的，无需额外的化学品或溶剂。因此，WO 3 颗粒中无定形的百分比在恒定的颗粒外部尺寸和形态中被独立控制。微米尺寸的催化剂用于避免由于其他催化参数（例如过大的表面积和量子限制效应）的过度支配而导致误导性的光催化测量。结果表明，在恒定的工艺条件下，光催化性能强烈依赖于催化剂中的无定形含量。该参数的降低对有机材料光分解速率的提高有很大影响。通过改变光催化过程中的催化剂数量也证实了无定形含量影响的趋势。该研究还完成了对 WO3 结晶（无定形转变为六方和单斜晶体结构）和光催化过程中发生的现象的理论考虑。该参数的降低对有机材料光分解速率的提高有很大影响。通过改变光催化过程中的催化剂数量也证实了无定形含量影响的趋势。该研究还完成了对 WO3 结晶（无定形转变为六方和单斜晶体结构）和光催化过程中发生的现象的理论考虑。该参数的降低对有机材料光分解速率的提高有很大影响。通过改变光催化过程中的催化剂数量也证实了无定形含量影响的趋势。该研究还完成了对 WO3 结晶（无定形转变为六方和单斜晶体结构）和光催化过程中发生的现象的理论考虑。