Department of Chemical Engineering, Gyeongsang National University, Jinju-si, Korea.
Environ Technol. 2021 Sep;42(22):3546-3553. doi: 10.1080/09593330.2020.1734097. Epub 2020 Mar 2.
TiO-PILCs and iron-doped TiO-PILCs were employed in order to destroy toxic microcystin-LR in the presence of HO under the UV light. While less than 5% of the initial microcystin-LR and TOC disappeared in 240 min with the TiO-PILCs, almost complete conversion of microcystin-LR could be achieved in 180 min on the 10 wt% iron-doped TiO-PILC-A. On the exterior surface of the iron-doped TiO-PILCs were mainly located iron particles which had nano-sized diameter and Fe/Fe cations together. Through Fenton-type oxidation on iron particles with HO, the big microcystin-LR molecules were converted primarily into smaller intermediate organic molecules of hydrocarbons, carboxylic acids and organic amines. The smaller intermediate molecules were believed to be diffused into the pores of the iron-doped TiO-PILCs and to be further mineralized into CO and HO through the action of photocatalysis on the TiO pillars. However, complete conversion of TOC could not be obtained due to the iron particle deactivation. XPS, TPO and TEM studies showed the continuous accumulation of carbonaceous materials onto the surface of iron particles.
为了在紫外光下 HO 的存在下破坏有毒的微囊藻毒素-LR，使用了 TiO-PILCs 和铁掺杂的 TiO-PILCs。在 240 分钟内，TiO-PILCs 中只有不到 5%的初始微囊藻毒素-LR 和 TOC 消失，而在 10wt%铁掺杂的 TiO-PILC-A 上，几乎可以在 180 分钟内完成微囊藻毒素-LR 的完全转化。在铁掺杂的 TiO-PILCs 的外表面上主要存在具有纳米级直径的铁颗粒和 Fe/Fe 阳离子。通过 Fenton 型氧化作用，HO 在铁颗粒上发生反应，将大的微囊藻毒素-LR 分子主要转化为较小的中间有机分子，如烃类、羧酸和有机胺。较小的中间分子被认为通过 TiO 柱的光催化作用扩散到铁掺杂的 TiO-PILCs 的孔中，并进一步矿化为 CO 和 HO。然而，由于铁颗粒失活，TOC 无法完全转化。XPS、TPO 和 TEM 研究表明，碳质材料不断积累到铁颗粒的表面上。
