화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.58, No.43, 20090-20098, 2019
Adsorptive Removal of Catechol from Aqueous Solution with a Water-Stable and Hydroxyl-Functionalized Terbium-Organic Framework
Nowadays, water pollution caused by diverse poisonous compounds, particularly hydroxy aromatic compounds and their derivatives, has become a prominent environmental issue because of the possible toxicity to human beings. This research adopted an adsorptive method to remove catechol using a water-stable hydroxyl-functionalized terbium-organic framework for the first time. The as synthesized new metal-organic framework (Tb-MOF) shows favorable thermostability and water stability based on results of thermogravimetric analyses, water vapor sorption, and powder X-ray diffraction. Along the c axis, Tb-MOF has a three-dimensional framework with channels of 8.4 x 8.1 angstrom(2) as well as high adsorption capacity with the maximal adsorption capacities of 260 mg/g for catechol than that of any reported adsorbent so far. Thermodynamics, adsorption kinetics, effects of pH, and effects of temperature were investigated in a batch reactor. The remarkably high adsorption capacity of Tb-MOF could be explained by the appropriate pore diameter of Tb-MOF in addition to the hydrogen bonding interplay of catechol molecules with Tb-MOF. In a breakthrough adsorption process of the Tb-MOF packed column, the adsorption breakthrough curve of a fixed bed for the catechol was found to favorably fit with the Thomas model. Because of its excellent catechol adsorption performance, the obtained Tb-MOF can be considered as a promising and suitable candidate as a high-performance catechol adsorber.