In this work, SiO₂@ZrO₂/TiO₂ nanoparticles have been synthesized and characterized by FTIR, XRD, SEM-EDX, TEM, BET-BJH, TG-DTA and DRS analyses. In addition, the photocatalytic activity of the nanoparticles prepared has been investigated in the photodegradation and photomineralization of metoclopramide (MCP). In particular, hexadecylamine (HDA) was used in the coating process functions as the soft template for the preparation of silica@mesostructured metal oxide core-shell nanosphere. A band gap energy (Eg) of 2.94 eV was found for the SiO₂@ZrO₂/TiO₂ sample, which corresponds to a 421.71 nm absorption edge wavelength. SiO₂@ZrO₂/TiO₂ nanoparticles showed unusually smaller band gap energy in comparison with their parent oxides; namely, TiO₂ (3.20 eV) and ZrO₂ (5.02 eV), which could be due to the generation of heterojunctions between the two phases. The best photocatalytic activity was obtained at pH 5 (near the pHpzc: 4), 0.7 g/L of the catalyst, and 15 mg/L MCP. A Hinshelwood kinetic analysis of the photodegradation process yielded a rate constant of 0.033 min⁻¹ with a t_1/2 value of 21 min. When the photodegraded MCP solutions were subjected to the COD experiment k = 6.76 min⁻¹ (t_1/2 = 18.05 min) were obtained for the mineralized MCP molecules. An activation energy of 15.3 kJ/mol was obtained for the process using the Arrhenius equation. A negative ΔS‡ (-0.23 kJ/mol) with positive ΔH‡ and ΔG‡ values were obtained for the MCP photodegradation by the SiO₂@ZrO₂/TiO₂ composite.

在这项工作中，我们合成了 SiO ₂ @ZrO ₂ /TiO ₂纳米颗粒，并通过 FTIR、XRD、SEM-EDX、TEM、BET-BJH、TG-DTA 和 DRS 分析对其进行了表征。此外，还研究了制备的纳米颗粒在甲氧氯普胺（MCP）的光降解和光矿化中的光催化活性。特别是，十六烷胺（HDA）在涂层过程中用作制备二氧化硅@介孔结构金属氧化物核壳纳米球的软模板。_{SiO 2} @ZrO ₂ /TiO ₂样品的带隙能量 (Eg) 为 2.94 eV ，对应于 421.71 nm 的吸收边波长。SiO ₂ @ZrO ₂ /TiO_{与它们的母体氧化物相比， 2个}纳米粒子显示出异常小的带隙能量；即，TiO ₂ (3.20 eV) 和 ZrO ₂ (5.02 eV)，这可能是由于两相之间异质结的产生。在 pH 5（接近 pHpzc：4）、0.7 g/L 催化剂和 15 mg/L MCP 时获得最佳光催化活性。光降解过程的 Hinshelwood 动力学分析产生 0.033 min ^-1的速率常数， _1/2值为 21 min。当光降解 MCP 溶液进行 COD 实验时k  = 6.76 min ^-1 (t _{1/ 2} = 18.05 min) 获得矿化 MCP 分子。使用 Arrhenius 方程为该过程获得了 15.3 kJ/mol 的活化能。_{对于 SiO 2} @ZrO ₂ /TiO ₂复合材料的 MCP 光降解，获得了负的 ΔS‡ (-0.23 kJ/mol) 和正的 ΔH‡ 和 ΔG‡ 值。