In this study, Fe₃O₄@TiO₂ decorated reduced graphene oxide (RGO) nanosheets were synthesized by loading iron oxide on the surface of RGO nanosheets and subsequently coating by titanium oxide, which can be employed as the persulfate (PS) activator and high-performance adsorbent toward thallium (Tl). PS could be effectively activated by the Fe₃O₄@TiO₂ decorated RGO nanosheets due to the presence of RGO and Fe(II), resulting in the rapid oxidation of Tl(I) to Tl(III). The removal of Tl(I) was found to be pH-dependent, with the removal efficiency of more than 88.5% in the pH range of 8.0–12.0 at the optimal PS dosage of 10 mM and material dosage of 0.2 g/L. The surface precipitation of Tl₂O₃ and enhanced adsorption affinity toward Tl were deduced to be main mechanisms for the extremely efficient removal of Tl(I) ions during the oxidation and adsorption hybrid process. The maximum removal capacity of the material at pH 8.0 was estimated as 673.2 mg/g based on the fitting result from the Langmuir model. Approximately 94.7% of ultimate removal capacity could be accomplished within the first 10 min at the initial Tl concentration of 8.5 mg/L. The PS catalytic oxidation coupled with the adsorption technique using the prepared Fe₃O₄@TiO₂ decorated RGO nanosheets were proven to be a promising approach for Tl(I) removal from water.

在这项研究中，Fe ₃ O ₄ @TiO ₂装饰的还原氧化石墨烯（RGO）纳米片是通过将氧化铁加载到RGO纳米片的表面上，然后用氧化钛涂覆而合成的，该氧化钛可用作过硫酸盐（PS）活化剂和toward（Tl）的高性能吸附剂。Fe ₃ O ₄ @TiO ₂可以有效地活化PS由于RGO和Fe（II）的存在，修饰的RGO纳米片被装饰，导致Tl（I）迅速氧化为Tl（III）。发现Tl（I）的去除取决于pH，在10 mM的最佳PS剂量和0.2 g / L的材料剂量下，在8.0-12.0的pH范围内，去除Tl（I）的效率超过88.5％。Tl ₂ O ₃的表面沉淀以及增强的对T1的吸附亲和力被认为是在氧化和吸附混合过程中极其有效地去除Tl（I）离子的主要机理。根据Langmuir模型的拟合结果，在pH 8.0时材料的最大去除能力估计为673.2 mg / g。在最初的T1浓度为8.5 mg / L的情况下，在最初的10分钟内可以完成约94.7％的最终去除量。使用制备的Fe ₃ O ₄ @TiO ₂装饰的RGO纳米片结合PS催化氧化和吸附技术被证明是从水中去除Tl（I）的一种有前途的方法。