Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, PR China.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, PR China.
J Hazard Mater. 2021 Jul 5;413:125278. doi: 10.1016/j.jhazmat.2021.125278. Epub 2021 Jan 30.
A novel metal-organic framework (UiO-66-PTC) for efficient removal of Pb ions from wastewater has been prepared by using 4-phenyl-3-thiosemicarbazide as the modifier. Various characterizations showed that UiO-66-PTC was successfully synthesized. The absorption results showed that the maximum adsorption capacity of Pb(II) is 200.17 mg/g at 303 K and optimal pH 5. The adsorption kinetic follows the pseudo-second-order model and the adsorption isotherms fit the Langmuir model. This shows that Pb(II) is a single-layer adsorption on the surface of the adsorbent and the rate-controlling step is chemical adsorption. The thermodynamic results show that the adsorption process can proceed spontaneously, belong to the exothermic reaction. The adsorbent can selectively uptake lead ions from wastewater containing multiple interfering ions. After four adsorption and desorption cycles, the adsorption efficiency is still high. The adsorption mechanism of Pb(II) on the adsorbent is mainly through the chelation of Pb(II) with N and S atoms. These results indicate that UiO-66-PTC is an effective material for efficiently and selectivity removal of Pb(II) from solution, which is of practical significance.
一种新型的金属有机骨架（UiO-66-PTC），以 4-苯基-3-硫代缩氨基脲为修饰剂，用于从废水中高效去除 Pb 离子。各种表征表明 UiO-66-PTC 已成功合成。吸附结果表明，在 303 K 和最佳 pH 值 5 下，Pb(II)的最大吸附容量为 200.17 mg/g。吸附动力学符合准二级模型，吸附等温线符合朗缪尔模型。这表明 Pb(II)在吸附剂表面上进行单层吸附，速率控制步骤为化学吸附。热力学结果表明，吸附过程可以自发进行，属于放热反应。吸附剂可以从含有多种干扰离子的废水中选择性地吸附铅离子。经过四次吸附和解吸循环，吸附效率仍然很高。Pb(II)在吸附剂上的吸附机理主要是通过 Pb(II)与 N 和 S 原子的螯合作用。这些结果表明，UiO-66-PTC 是一种从溶液中高效、选择性去除 Pb(II)的有效材料，具有实际意义。
