Synthesis of activated carbon-based amino phosphonic acid chelating resin and its adsorption properties for Ce(III) removal.
This work aims to investigate the adsorption of Ce(III) onto chelating resin based on activated carbon (CRAC). The CRAC adsorbent was prepared from activated carbon (AC) followed by oxidation, silane coupling, ammoniation and phosphorylation, and characterized by Fourier transform-infrared spectrometry, nitrogen adsorption measurements and scanning electron microscopy. The effects of solution pH, adsorbent dosage and contact time were studied by batch technique. Langmuir and Freundlich isotherms were used to describe the adsorption behaviour of Ce(III) by CRAC, and the results showed that the adsorption behaviour well fitted the Langmuir model. The maximum uptake capacity (qmax) calculated by using the Langmuir equation for cerium ions was found to be 94.34 mg/g. A comparison of the kinetic models and the overall experimental data was best fitted with the type 1 pseudo second-order kinetic model. The calculated thermodynamic parameters (ΔG°, ΔH° and ΔS°) showed that the adsorption for Ce(III) was feasible, spontaneous and exothermic at 25-45 °C. The CRAC showed an excellent adsorptive selectivity towards Ce(III). Moreover, more than 82% of Ce(III) adsorbed onto CRAC could be desorbed with HCl and could be used several times.
a Faculty of Material and Chemistry , China University of Geosciences , Wuhan 430074 , People's Republic of China.
Tao
T
Chen
Chunjie
C
Yan
Yixia
Y
Wang
Conghai
C
Tang
Sen
S
Zhou
Yuan
Y
Zhao
Rui
R
Ma
Ping
P
Duan
D000327:Adsorption; D002563:Cerium / Q000302:isolation & purification*; D002606:Charcoal / Q000138:chemical synthesis / Q000737:chemistry*; D002614:Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010757:Phosphorous Acids / Q000138:chemical synthesis / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D002614:Chelating Agents; D010757:Phosphorous Acids; D014874:Water Pollutants, Chemical; D014867:Water; C570063:phosphonic acid; D002606:Charcoal; D002563:Cerium
activated carbon; adsorption; cerium; chelating resin; kinetic