Adsorption of Lead Ions from Aqueous Solutions Using Gamma Irradiated Minerals

作者：Cruz Olivares Julian^*; Martinez Barrera Gonzalo; Perez Alonso Cesar; Barrera Diaz Carlos Eduardo; Chaparro Mercado Maria del Carmen; Urena Nunez Fernando

来源：Journal of Chemistry, 2016, 2016: 8782469.

DOI：10.1155/2016/8782469

For the first time, an irradiated mineral was used as a novel modified adsorbent for lead removal of aqueous solutions. The effects of gamma radiation doses and temperature on the lead adsorption capacity of an unknown mineral were evaluated. The results show that, in the chemisorption process, the highest adsorption capacity (9.91mg/g) and the maximum percentage of lead removal (99.1%) were reached at 40 degrees C when using an irradiated mineral at 150 kGy. The improvement on the lead adsorption speed was the most important feature of the irradiated mineral. The experimental results were successfully correlated with the pseudo second-order kinetic model. For all results, the average absolute relative deviations (AARD) were less than 13.20%, and the correlation factor (r(2)) was higher than 0.998. Moreover, the average values of the thermodynamic parameters (Delta G(0) = -10612 J/mol, Delta H-0 = -12360 J/mol, and Delta S-0 = 171 J/mol K) suggest the feasibility of the proposed process, in terms of the endothermic and irreversible chemisorption results; moreover, ion exchange was evaluated through the EDS results. The X-ray diffraction analysis showed that the unknown irradiated mineral is mainly composed of quartz (SiO2), calcite (CaCO3), and calciummagnesiumsilicate (Ca0.15Mg0.85) Mg (SiO6).

• 出版日期2016