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Synthesis of Cu‐BTC Metal‐Organic Framework by Ultrasonic Wave‐Assisted Ball Milling with Enhanced Congo Red Removal Property
Author(s) -
Luo Yun,
Chen Ding,
Wei Fuhua,
Liang Zhao
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802067
Subject(s) - adsorption , endothermic process , congo red , gravimetric analysis , langmuir adsorption model , materials science , scanning electron microscope , thermogravimetric analysis , metal organic framework , ball mill , chemical engineering , kinetics , enthalpy , nuclear chemistry , inorganic chemistry , chemistry , thermodynamics , metallurgy , organic chemistry , composite material , physics , quantum mechanics , engineering
Cu‐BTC (BTC=1,3,5‐benzenetricarboxylate) metal‐organic framework (MOF) with truncated octahedral morphology was synthesized by ultrasonic wave‐assisted ball milling at room temperature and atmospheric pressure. It was characterized by X‐ray powder diffraction (XRD), thermo‐gravimetric analysis (TGA), nitrogen adsorption and scanning electron microscopy (SEM). The parameters such as synthetic method, reaction time and raw material molar ratio (H 3 BTC: Cu 2+ ) were studied to tune the growth of Cu‐BTC crystals. Adsorption of Congo red (CR) on Cu‐BTC was studied in respect of adsorption kinetics, isotherm and thermodynamics. Pseudo‐second‐order kinetics and Langmuir adsorption isotherm model were matched well with the adsorption process. The maximum adsorption capacity ( Q m ) was 884.96 mg/g, attributed to the interfacial effect in (100) facets. Thermodynamic parameters confirmed that the adsorption was a spontaneous and endothermic process, and entropy effect was the driving force for adsorption process.