期刊
CHEMICAL ENGINEERING JOURNAL
卷 333, 期 -, 页码 58-65出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.09.161
关键词
Tara gum; FeCl3 activation; Activation temperature; Activated carbon; Adsorption; Antipyrine
资金
- Spanish MINECO [CTQ2016-78576-R]
- Peruvian FINCyT [PIAP-3-P-521-14]
Activated carbons were synthesized by FeCl3-activation of Tara gum at different temperatures (400-1000 degrees C). The activating agent and the precursor were physically mixed at different ratios (r= FeCl3: precursor, 0.5-3.0 wt). At r = 2 and 800 degrees C the most developed porosity was achieved, with a BET surface area of 1680 m(2).g(-1) and a pore volume near 1 cm(3).g(-1), corresponding mostly to micropores (approximate to 75%). The carbons were fully characterized and tested for the aqueous-phase adsorption of antipyrine, used as model emerging pollutant. The kinetic curves and adsorption isotherms at 20, 40 and 60 degrees C were obtained, which fitted well to hyperbolic and Langmuir equations, respectively. At 20 degrees C, the saturation adsorption capacity was around 275 mg.g(-1) AC. The free energy of adsorption varied from -40.2 to -35.7 kJ.mol(-1), while values close to -3 kJ.mol(-1) and 112 J.mol(-1).K-1, were obtained for the enthalpy and entropy of adsorption, respectively.
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