CONACyT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., 78216, San Luis Potosí, SLP, Mexico.
CONACyT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., 78216, San Luis Potosí, SLP, Mexico.
J Environ Manage. 2022 Aug 1;315:115204. doi: 10.1016/j.jenvman.2022.115204. Epub 2022 May 3.
This investigation reports the photocatalytic performance of the tungsten doped titania (TiO:W or TW) with and without coating of chlorophyll (Chl) for the removal of the RhB dye from the drinking water. These particles were also supported on recycled plastic bottle caps (Bcap) to form other photocatalytic composites (TW/Bcap and TW + Chl/Bcap). The SEM images demonstrated that the TW particles without Chl had irregular shapes and sizes of 0.8-12 μm. The TW particles coated by the Chl presented shapes of quasi-rounded grains and smaller particle sizes of 0.8-1.8 μm. The photocatalytyic experiments showed that the photocatalyst powders containing Chl removed completely the RhB dye from the water after 2h under UV-VIS light, while the photocatalyst without Chl removed a maximum of 95% of the RhB. Interestingly, the TW/Bcap and TW + Chl/Bcap composites removed 94-100% of the RhB after 2h. Those ones removed such dye by photocatalysis and by physical adsorption at the same time (as confirmed by the absorbance and FTIR measurements), therefore, the removal of RhB was still very high. Scavenger experiments were also achieved and found that the •OH radicals are the main oxidizing species generated by the photocatalysts with and without Chl. The •O radicals and holes (h) were the secondary oxidizing species. The presence of the chlorophyll on the photocatalyst increased in general the light absorption and the photocurrent. Overall, our work demonstrated that making composites with recycled plastic bottle caps is a feasible alternative to remove dyes from contaminated drinking water with high efficiency and low cost.
这项研究报告了掺杂钨的二氧化钛（TiO:W 或 TW）在没有和有叶绿素（Chl）涂层的情况下对饮用水中 RhB 染料的光催化性能。这些颗粒还被负载在回收的塑料瓶盖（Bcap）上，形成其他光催化复合材料（TW/Bcap 和 TW+Chl/Bcap）。SEM 图像表明，没有 Chl 的 TW 颗粒形状不规则，尺寸为 0.8-12μm。涂覆了 Chl 的 TW 颗粒呈准圆形颗粒形状，粒径较小，为 0.8-1.8μm。光催化实验表明，含有 Chl 的光催化剂粉末在 UV-VIS 光下 2 小时后可完全去除水中的 RhB 染料，而不含 Chl 的光催化剂最多可去除 95%的 RhB。有趣的是，TW/Bcap 和 TW+Chl/Bcap 复合材料在 2 小时内可去除 94-100%的 RhB。这些复合材料通过光催化和物理吸附同时去除 RhB（如吸光度和 FTIR 测量所证实），因此 RhB 的去除率仍然很高。还进行了清除剂实验，发现•OH 自由基是有无 Chl 的光催化剂产生的主要氧化物质。•O 自由基和空穴（h）是次要的氧化物质。光催化剂上存在叶绿素通常会增加光吸收和光电流。总的来说，我们的工作表明，用回收的塑料瓶盖制备复合材料是一种高效、低成本去除受污染饮用水中染料的可行方法。
