Uranium biosorption by hydroxyapatite and bone meal: evaluation of process variables through experimental design

An adsorption agent based on chitosan–zeolite composite: environmental and radioactive liquid waste remediation

“…Watanabe et al 37 used hydroxyapatite and bone meal to treat uranium (U (total)) in a LORW. In terms of this radionuclide, the authors found greater adsorption capacity, with 22 mg g −1 and R (%) = 99.34%.…”

“…According to Watanabe et al , 37 three main mechanisms may occur in the removal of elements such as uranium when in contact with an adsorbent. These mechanisms are adsorption, dissolution–precipitation, and ion exchange.…”

“…14 Therefore, effective treatments for the removal of 137 Cs from the environment are essential to guarantee the safety of living beings. Among a multitude of methods that have been As found from the literature, adsorption is inuenced by many physicochemical factors such as pH, initial pollutant concentrations, and adsorbent dosage, 37 and their interactions are so complex that the generation of empirical models that do not take into account their inuence, usually do not provide sufficient information and may yield unsatisfactory predictions. In fact, most studies rely on assessing the effects involved in the adsorption process by employing the traditional "one-factor-ata-time" (OFAT) approach to experimentation.…”

Study of the effect of uranium recovery at Hap/Fe2O3 composite and Fe2O3 interfaces on the parameters of the electrical double layer

“…3 However, there are many different modifications of hydroxyapatite, which were studied in uranium adsorption processes, but obtaining these composites is more complex than synthesizing Hap/Fe 2 O 3 . 39–49…”

“…3 However, there are many different modications of hydroxyapatite, which were studied in uranium adsorption processes, but obtaining these composites is more complex than synthesizing Hap/Fe 2 O 3 . [39][40][41][42][43][44][45][46][47][48][49] The aim of this study was the characterization of surface properties to determine and compare the nanostructure of electrical double layers on the surfaces of a synthetic composite Hap/Fe 2 O 3 as well as commercially available iron oxide formed in the solution of a basic electrolyte and those containing additionally inorganic ions U(VI). The parameters characterizing the surface and diffusion parts of the edl were determined by the use of the potentiometric titration method and electrophoretic mobility measurements.…”