Jandam Natjakorn, Serivalsatit Karn, Hunsom Mali, Pruksathorn Kejvalee
Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
Department of Materials Science, Faculty of Science, Chulalongkorn University,Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
ACS Omega. 2021 Sep 16;6(38):24709-24719. doi: 10.1021/acsomega.1c03483. eCollection 2021 Sep 28.
A series of nonmetal-doped titanium dioxide (Nm /TiO, where is the weight fraction of nonmetal elements) photocatalysts was prepared via ultrasonic-assisted impregnation for simultaneous hydrogen (H) production and chemical oxygen demand (COD) removal from industrial wastewater. Three types of Nm elements, carbon (C), silicon (Si), and phosphorus (P), were explored. The P/TiO exhibited a higher photocatalytic activity for H production and COD removal than the C/TiO and Si/TiO photocatalysts. Approximately 6.43 mmol/g photocatalyst of H was produced, and around 26% COD removal was achieved at a P/TiO loading of 4.0 g/L, a light intensity of 5.93 mW/cm, and a radiation time of 4 h. This is because the P/TiO photocatalyst exhibited lower point of zero charge values and a more appropriate band position compared with other Nm /TiO photocatalysts to produce H, which can consequently form H, and reactive oxygen species (HO and O ), which serve as oxidizing agents to degrade the organic pollutants. Increasing the content of the P element doped into the TiO-based material up to 7.0% by weight enhanced the H production and COD removal up to 8.34 mmol/g photocatalyst and 50.6%, respectively. This is attributed to the combined effect of the point of zero charge value and the of the prepared photocatalysts. The photocatalytic activity of the P/TiO photocatalyst was still higher than the TiO-based material after the fourth use.
通过超声辅助浸渍法制备了一系列用于从工业废水中同时制氢和去除化学需氧量（COD）的非金属掺杂二氧化钛（Nm /TiO，其中 是非金属元素的重量分数）光催化剂。研究了三种类型的非金属元素，即碳（C）、硅（Si）和磷（P）。与C/TiO和Si/TiO光催化剂相比，P/TiO对制氢和COD去除表现出更高的光催化活性。在P/TiO负载量为4.0 g/L、光强为5.93 mW/cm²、辐射时间为4 h的条件下，产生了约6.43 mmol/g光催化剂的氢气，实现了约26%的COD去除率。这是因为与其他Nm /TiO光催化剂相比，P/TiO光催化剂表现出更低的零电荷点值和更合适的能带位置以产生H₂，进而形成H₂以及作为氧化剂降解有机污染物的活性氧物种（·OH和O₂ ）。将掺杂到TiO基材料中的P元素含量增加到7.0%（重量），分别将产氢量和COD去除率提高到8.34 mmol/g光催化剂和50.6%。这归因于所制备光催化剂的零电荷点值和 的综合作用。第四次使用后，P/TiO光催化剂的光催化活性仍高于TiO基材料。
