School of Energy and Environment, Thapar Institute of Engineering and Technology, Patiala, 147004, India.
School of Energy and Environment, Thapar Institute of Engineering and Technology, Patiala, 147004, India.
Chemosphere. 2021 Aug;276:130180. doi: 10.1016/j.chemosphere.2021.130180. Epub 2021 Mar 12.
Industrial waste materials such as Fly Ash (FA), Foundry Sand (FS) were used as support material by mixing them with clay to fix the catalyst. Where FA and FS served as an iron (Fe) source to induce the photo-Fenton process. The presence of Fe in FA and FS was affirmed by SEM-EDS characterization. UV-DRS was performed to analyze the bandgap of the composite which reduced from 2.96 to 2.82 eV after doping TiO2 with Ag. This composite was used to initiate photocatalysis. The fixing of catalyst on a support formed the Fe-Ag-TiO2 complex which led to the commencement of the in-situ dual process(i.e. photocatalysis and photo-Fenton) in fixed bed mode. After the optimization of several parameters such as HO dose, the area covered by beads, A/V ratio, Flow rate, pH under solar irradiations for 60 min, 94.4% degradation of CIP was attained. XRD analysis was carried out to confirm the crystallographic phases of the composite anatase and rutile phases of TiO were present in the composite. The systematic leaching of iron took place in this process and was confirmed by iron estimation during the reaction process. To understand the elemental composition of the composite SEM-EDS was performed and the present of TiO, Fe and Ag was affirmed. Composite beads were stable and active even after the 30 recycles as confirmed by SEM-EDS. The intermediate products were analyzed by GC-MS analysis whereas the toxicity of the treated samples was studied by the zone inhibition test.
工业废料如飞灰 (FA)、铸造砂 (FS) 被用作支持材料，通过与粘土混合来固定催化剂。FA 和 FS 作为铁 (Fe) 源，用于诱导光芬顿过程。SEM-EDS 特征分析证实了 FA 和 FS 中存在 Fe。UV-DRS 用于分析复合材料的能带隙，在掺杂 TiO2 后，其能带隙从 2.96 降至 2.82 eV。该复合材料用于引发光催化。催化剂在载体上的固定形成了 Fe-Ag-TiO2 复合物，这导致固定床模式下原位双过程（即光催化和光芬顿）的开始。在优化 HO 剂量、珠子覆盖面积、A/V 比、流速、pH 值等多个参数后，在太阳光下反应 60 分钟，达到了 94.4%的 CIP 降解。进行了 XRD 分析以确认复合的晶体相，TiO 的锐钛矿和金红石相存在于复合材料中。在这个过程中发生了铁的系统浸出，并通过反应过程中的铁估计得到了证实。为了了解复合的元素组成，进行了 SEM-EDS 分析，证实了 TiO、Fe 和 Ag 的存在。复合珠即使在 30 次循环后仍然稳定且具有活性，这一点通过 SEM-EDS 得到了证实。用 GC-MS 分析了中间产物，并用抑菌圈试验研究了处理样品的毒性。
