Titanium in different amounts has been successfully doped into the zirconium-based metal–organic framework UiO-66 via an in situ synthesis method, resulting in a series of hybrid UiO-66-nTi MOFs. These materials maintain a relatively high crystallinity and excellent structural stability. The addition of titanium has a significant effect on the crystal size and morphology of UiO-66. The UiO-66-nTi MOFs exhibit a sphere-like crystal morphology with a smaller crystal size and a rougher surface compared to the octahedral UiO-66 crystals. The framework order and porosity of the UiO-66-nTi MOFs decrease slightly due to titanium doping. The UiO-66-nTi MOFs were studied as adsorbents for the removal of an organic dye from water. The results demonstrate that these hybrid materials have enhanced adsorption capacity for the organic dye Conge red in comparison with the parent UiO-66. UiO-66-2.7Ti with 2.7% titanium doping shows the highest adsorption capacity of 979 mg g⁻¹, which is three times higher than that of the parent UiO-66. The strong electrostatic attraction between the positively charged surface of UiO-66-2.7Ti and the negatively charged Congo red molecules was identified as the main driving force for the high adsorption capacity.

中文翻译：

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原位合成钛掺杂杂化金属-有机骨架UiO-66，具有增强的有机染料吸附能力

钛以不同的量已被成功地掺杂到基于锆的金属-有机骨架UIO-66通过一个在原位合成方法，从而得到一系列混合UIO-66-的Ñ钛的MOF。这些材料保持较高的结晶度和优异的结构稳定性。钛的添加对UiO-66的晶体大小和形态有重大影响。与八面体UiO-66晶体相比，UiO-66 - n Ti MOF呈现出球形的晶体形态，具有较小的晶体尺寸和更粗糙的表面。由于钛掺杂，UiO-66- n Ti MOF的骨架顺序和孔隙率略有下降。UiO-66- n研究了将Ti MOF作为吸附剂从水中去除有机染料的方法。结果表明，与母体UiO-66相比，这些杂化材料对有机染料Conge red的吸附能力增强。钛掺杂量为2.7％的UiO-66-2.7Ti的最高吸附容量为979 mg g ^-1，是母体UiO-66的三倍。UiO-66-2.7Ti带正电的表面和带负电的刚果红分子之间的强静电吸引力被认为是高吸附能力的主要驱动力。