Phosphogypsum (PG), the waste byproduct resulting from wet process phosphoric acid production, is employed as a selective and effective adsorbent for total rare earth elements (REEs) from aqueous solution and leach liquor. The elaboration of PG adsorbent complemented after some physical treatments. Adsorption and elution studies carried out in experimental batches, including the effect of pH, adsorbent dose, initial REE concentration, and equilibrium time. Adsorption of REEs onto PG fitted well with Langmuir isotherm with a theoretical capacity surpassed 357 mg/g. REEs were effectively eluted from loaded PG with 2 mol L−1 HCl acid with an efficiency of 94%. PG showed an outstanding selectivity towards REEs in the presence of many cations and anions, for instance (Fe3+, UO22+, Ca2+, SO42−, NO3−). Different qualitative techniques such as EDS, SEM, and FTIR used to emphasize the adsorption of REEs onto PG. The film diffusion model was the preponderant adsorption mechanism for REEs; also, the adsorption process has a good accordance with pseudo-second-order kinetic model.
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Hagag, M.S., Morsy, A.M.A., Ali, A.H. et al. Adsorption of Rare Earth Elements onto the Phosphogypsum a Waste Byproduct. Water Air Soil Pollut 230, 308 (2019). https://doi.org/10.1007/s11270-019-4362-z
- Phosphogypsum PG
- Rare earth elements
- Phosphate Abu-tartour leach liquor and stripping