Ni(II) immobilization by bio-apatite materials: Appraisal of chemical, thermal and combined treatments

Abstract

Article Highlights • Apatite materials derived from bovine bones were studied as Ni(II) ions sorbents • Raw bones were compared with chemically, thermally and chemically/thermally treated samples • Different sorption mechanisms were identified by sorption data and FT-IR spectra analysis • Combined chemical/thermal treatment produced material with the highest sorption capacity • Sorbed Ni(II) was very stable at low sorbent loads, while largely mobile at high loadings

Radioactive Contamination of the Soil: Assessments of Pollutants Mobility with Implication to Remediation Strategies

“…In general, solid matrices that have shown superior immobilization potential towards radioactive ions in aqueous solutions are suitable for testing in the contaminated soil. Based on the numerous investigations of the sorption affinities and capacities toward variety of radioactive pollutants, the most prominent groups of materials are aluminosilicates [73][74][75][76][77][78][79][80] and phosphates [81][82][83][84][85][86][87][88][89]. The main operating mechanisms are quite different for these two groups: while aluminosilicate addition to soil increases the number of sorption sites, phosphate materials, mainly from the apatite group, act through several removal mechanisms (ion-exchange, formation of specific surface complexes, and structural incorporation of pollutants by co-precipitation and dissolution/precipitation processes).…”

“…Aluminosilicates, primarily clay minerals, and zeolites are inorganic ion-exchangers with high surface area, which have been conventionally used for water treatment processes, for the treatment of liquid nuclear waste, and for the protection against nuclear waste leaking [79][80][81][82][83][84][85][86][87][88][89][90]. Natural zeolites are the framework aluminosilicates, with variable porosity due to which they can selectively capture the ions having an appropriate radius.…”

“…In soil, apatite matrices were highly effective for U uptake; however, the increase of organic matter content influenced the decrease of amendments efficiency [95]. Furthermore, the selectivity and capacity of HAP towards Pu, Co, Ni is very high, moderate for Sr, while low considering Cs and Tc [78,[81][82][83][84][86][87][88].…”