期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 28, 期 4, 页码 783-793出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(18)64711-9
关键词
La(III)-modified zeolite; fluoride removal; zinc sulfate solution; adsorption isotherm; kinetics
资金
- National Natural Science Foundation of China [51474238, 51674301]
To understand the mechanism of fluoride removal from the simulated zinc sulfate solution by the La(III)-modified zeolite, the adsorbent was characterized by XRD, SEM and EDS. The effects of absorbent dose and contact time, the adsorption isotherms and the sorption kinetics were investigated. The experimental results were compatible with the Langmuir isotherm model. The theoretical maximum adsorption capacities are 20.83 and 23.04 mg/g at 303 and 313 K, respectively. And the physisorption is revealed using the Temkin isotherm model and the D-R isotherm model. The sorption process is more suitable by the pseudo-second-order kinetic models. Thermodynamic parameters such as standard free energy change (Delta G(circle dot) < 0 kJ/mol), standard enthalpy change (Delta H-circle dot = 8.28 kJ/mol) and standard entropy change (Delta S-circle dot = 0.030 kJ/(mol.K)) indicate the spontaneity of adsorption and endothermic physical sorption. Furthermore, the fluoride concentration in the industrial zinc sulfate solution decreases from 98.05 to 44.09 mg/L with the adsorbent dosage of 15 g/L.
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