Journal
SCIENCE CHINA-CHEMISTRY
Volume 56, Issue 11, Pages 1516-1524Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-013-5001-y
Keywords
zirconyl-molybdopyrophosphate-tributyl phosphate; uranium; adsorption kinetics; adsorption thermodynamics
Categories
Funding
- National Natural Science Foundation of China [21276193]
- National High-Tech Research & Development Program of China (863 Program) [2012AA063504]
- Tianjin Natural Science Foundation [2013F1-0033]
- Project of Ocean with Scientific Technology in Tianjin [KJXH2011-10]
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Zirconyl-molybdopyrophosphate-tributyl phosphate (ZMPP-TBP) was a novel organic-inorganic composite adsorbent prepared by co-precipitation method and used in the adsorption of uranium from aqueous solution in batch adsorption experiments. The as-obtained product was characterized using SEM, energy dispersive X-ray spectroscopy (EDX), XRD and BET-N-2 adsorption measurements. The study had been conducted to investigate the effects of solution pH, temperature, contact time, initial concentration and coexisting ions. A maximum removal of 99.31% was observed for an initial concentration 5 mg/L, at pH 6.0 and an adsorbent dose of 1.0 g/L. The isothermal data were fitted with both Langmuir and Freundlich equations, but the data fitted the former better than the latter. According to the evaluation using the Langmuir equation, the maximum adsorption capacity of uranium (VI) was 196.08 mg/g at 293 K and pH 6.0. The pseudo-first-order kinetic model and pseudo-second-order kinetic model were used to describe the kinetic data, and the pseudo-second-order kinetic model was better. The thermodynamic parameter Delta G was calculated, the negative Delta G values of uranium (VI) at different temperature showed that the adsorption process was spontaneous. The good reusability of ZMPP-TBP also indicated that the ZMPP-TBP was a very promising adsorbent for uranium adsorption from aqueous solution.
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