In the present work, a series of nanohybrids based on UiO-66 as a physicochemical stable metal-organic framework (MOF) and different amounts of thermally oxidized nanodiamond (OND) (0.5–10 wt%) were synthesized and used as adsorbents for anionic (methyl red, MR, and methyl orange, MO) and cationic (malachite green, MG, and methylene blue, MB) dyes from contaminated water in single and binary dye solutions. The single adsorbents and their nanohybrids were characterized by FESEM, FTIR, XRD,TGA, BET, and zeta potential measurements. The experimental adsorption results displayed that the synthesized nanohybrids presented higher adsorption capacity for anionic dyes compared to cationic dyes in both single and binary dye solutions. It was deduced that the electrostatic interactions and hydrogen bonding between anionic dye molecules and adsorbents were the main mechanisms for selective adsorption of these dyes onto synthesized nanohybrids. Additionally, the results suggested that the maximum improvement in dye adsorption was achieved at certain concentration of OND in the nanohybrid, e.g. at 3 wt% OND named OND-UiO-3, which was associated to its microstructure. OND-UiO-3 nanoparticles displayed an increase of 532% in MR adsorption capacity and a four-order-of-magnitude increase, in removal rate compared to parent UiO-66 nanoparticle.

在本工作中，合成了一系列基于UiO-66的纳米杂化物，作为物理化学稳定的金属有机骨架（MOF）和不同量的热氧化纳米金刚石（OND）（0.5-10 wt％），并将其用作阴离子吸附剂单一和二元染料溶液中的污水中的阳离子染料（甲基红MR和甲基橙MO）和阳离子染料（孔雀绿MG和亚甲基蓝MB）。通过FESEM，FTIR，XRD，TGA，BET和ζ电势测量来表征单一吸附剂及其纳米杂化物。实验吸附结果表明，与单一染料和二元染料溶液中的阳离子染料相比，合成的纳米杂化物对阴离子染料的吸附能力更高。可以推断，阴离子染料分子与吸附剂之间的静电相互作用和氢键是将这些染料选择性吸附到合成纳米杂化物上的主要机理。另外，结果表明，在纳米杂化物中一定浓度的OND下，例如在3wt％的称为OND-UiO-3的OND下，染料吸附的最大改善是实现的，这与其微观结构有关。与母体UiO-66纳米颗粒相比，OND-UiO-3纳米颗粒的MR吸附能力提高了532％，去除速率提高了4个数量级。以3 wt％的OND命名为OND-UiO-3，这与其微结构有关。与母体UiO-66纳米颗粒相比，OND-UiO-3纳米颗粒的MR吸附能力提高了532％，去除率提高了四个数量级。以3 wt％的OND命名为OND-UiO-3，这与其微结构有关。与母体UiO-66纳米颗粒相比，OND-UiO-3纳米颗粒的MR吸附能力提高了532％，去除速率提高了4个数量级。