In this study, undoped and Magnesium doped TiO₂ nanoparticles (Mg-TiO₂ NPs) are successfully synthesized via a simple sol–gel method cost-effectively. The prepared Mg- TiO₂ NPs is characterized by UV–Vis, FTIR, PL, XRD, FESEM, TEM, and EDAX. UV–Visible Spectroscopy showed that an increase in the optical bandgap concerning the concentration of dopant Mg increases. The bandgap values were found to be 3.57–3.54 eV. FTIR spectra shows that the presence of the characteristic stretching and bending vibrational band of Ti–O bonding at 468 cm⁻¹ and shifts in vibrational bands were observed for Mg-TiO₂ NPs. PL spectra of Mg- TiO₂ NPs at different concentrations exhibit a strong UV emission band. X-ray diffraction confirmed the formation of the tetragonal anatase phase. The average crystallite size of synthesized samples was found to be 22–19 nm. The average crystallite size of Mg- TiO₂ NPs decreases with increasing the concentration of dopant Mg. The FESEM and TEM analysis confirmed that the spherical morphology for both TiO₂ and Mg-TiO₂ NPs. SAED pattern confirms the crystalline nature of prepared samples. EDAX spectra confirm the presence of Ti, O, and Mg and confirm that Mg²⁺ ions are present in the TiO₂ lattices. The prepared samples were investigated against gram-positive and gram-negative bacteria. The prepared samples exhibit potent antibacterial activity against gram-negative bacteria than the gram-positive bacteria. The prepared samples exhibit significant photocatalytic degradation for Methylene blue (MB).

在本研究中，通过简单的溶胶-凝胶法，成功地合成了未掺杂和镁掺杂的 TiO ₂纳米粒子（Mg-TiO ₂ NPs）。制备的 Mg-TiO ₂ NPs 通过紫外-可见光、FTIR、PL、XRD、FESEM、TEM 和 EDAX 进行表征。紫外-可见光谱表明，随着掺杂剂 Mg 浓度的增加，光学带隙的增加。发现带隙值为 3.57–3.54 eV。FTIR 光谱表明，在 468 cm ^{-1 处}观察到Ti-O 键的特征伸缩振动带和振动带移动，观察到 Mg-TiO ₂ NPs。Mg-TiO _{2 的}PL光谱不同浓度的纳米颗粒表现出很强的紫外发射带。X 射线衍射证实了四方锐钛矿相的形成。发现合成样品的平均微晶尺寸为 22-19 nm。Mg-TiO ₂ NPs的平均晶粒尺寸随着掺杂剂Mg浓度的增加而减小。FESEM 和 TEM 分析证实了 TiO ₂和 Mg-TiO ₂ NPs的球形形态。SAED 图案证实了所制备样品的结晶性质。EDAX 光谱确认了 Ti、O 和 Mg 的存在，并确认了 Mg ²⁺离子存在于 TiO _{2 中}格子。针对革兰氏阳性和革兰氏阴性细菌研究制备的样品。制备的样品对革兰氏阴性菌表现出强于革兰氏阳性菌的抗菌活性。制备的样品对亚甲蓝 (MB) 表现出显着的光催化降解。