College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals, Nanjing 210037, China.
J Colloid Interface Sci. 2017 Aug 1;499:151-158. doi: 10.1016/j.jcis.2017.03.101. Epub 2017 Mar 28.
UiO-66 was modulated by addition of acetic acid or HCl in the precursor solution. The resulting acetic acid-promoted UiO-66has more regular octahedral structures and high surface areas of 892-1090m/g. Anionic dyes (methyl orange (MO) and Congo red (CR)) and cationic dyes (methylene blue (MB) and rhodamine B (RhB)) were examined for the selective dye adsorption on various UiO-66. The acid-promoted UiO-66 exhibits an excellent selective adsorption to anionic dyes, where the adsorption capacities of MO and MB are 84.8 and 13.2mg/g, respectively. However, UiO-66 prepared without acid shows similar adsorption to both anionic dye MO (70.4mg/g) and cationic dye MB (67.5mg/g). Mixed dyes (MO/MB and MO/RhB) adsorption on acid-promoted UiO-66 further proves the selective adsorption to anionic dyes. The adsorption mechanism was studied by testing the Zeta potential of acid-promoted UiO-66, and more positive Zeta potential (hydrogen ions) of UiO-66 is beneficial to the anionic dye adsorption.
UiO-66 通过在前驱体溶液中添加乙酸或 HCl 进行调节。所得的乙酸促进的 UiO-66 具有更规则的八面体结构和 892-1090m²/g 的高表面积。研究了阴离子染料（甲基橙（MO）和刚果红（CR））和阳离子染料（亚甲蓝（MB）和罗丹明 B（RhB））在各种 UiO-66 上的选择性染料吸附。酸促进的 UiO-66 对阴离子染料表现出优异的选择性吸附，其中 MO 和 MB 的吸附容量分别为 84.8 和 13.2mg/g。然而，没有酸制备的 UiO-66 对阴离子染料 MO（70.4mg/g）和阳离子染料 MB（67.5mg/g）表现出相似的吸附。在酸促进的 UiO-66 上吸附混合染料（MO/MB 和 MO/RhB）进一步证明了对阴离子染料的选择性吸附。通过测试酸促进的 UiO-66 的 Zeta 电位研究了吸附机理，UiO-66 的更正的 Zeta 电位（氢离子）有利于阴离子染料的吸附。
