Characterization and properties of Pleurotus mutilus fungal biomass as adsorbent of the removal of uranium(VI) from uranium leachate

Journal of Radioanalytical and Nuclear Chemistry (Impact Factor: 1.03). 01/2013; 295(1). DOI: 10.1007/s10967-012-1911-y


Removal and recovery of uranium from dilute aqueous solutions by dead fungal biomass (Pleurotus mutilus) have been studied by biosorption. The parameters that affect the uranium(VI) adsorption, such as: pH solution, temperature, biomass particle size and speed of stirring have been investigated and optimized. The experimental data were analyzed using pseudo-first-order and pseudo-second-order equations. The Freundlich and Langmuir adsorption models have been used for the mathematical description of the adsorption equilibrium. The maximum uranium biosorption capacity has been calculated. The value obtained (636.9 mg g−1) showed that P. mutilus is a good adsorbent. Also, the chemical bands involved in uranium link have been identified. We have applied this biosorption to actual waste uranium leachate, the results are satisfactory and promising.

Download full-text


Available from: Hakim Lounici
  • [Show abstract] [Hide abstract]
    ABSTRACT: Adsorption of U(VI) from aqueous solution by cross-linked rice straw(CRS) was studied with batch experiments. The adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR). The effect of contact time, initial pH, temperature, adsorbent amount and initial U(VI) concentration was investigated. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) adsorption isotherms and two kinetic models of pseudo-first-order and pseudo-second-order were used to describe the adsorption process. The result showed that the adsorption process was highly pH dependent and the favorable initial pH was 5.0. The adsorption process was rapid within first 60 min and equilibrium reached at 100 min. The adsorption process could be well defined by the Langmuir isotherm and pseudo-second-order equation, which indicated that the chemical adsorption was the rate-limiting step. The thermodynamic parameters (∆H°, ∆S°, ∆G°) of the adsorption system were also calculated. The negative value of ∆H° and ∆G° indicated that the reaction was endothermic and spontaneous in nature. All the above suggested that CRS has considerable potential for the removal of U(VI) from aqueous solution.
    No preview · Article · Oct 2013 · Journal of Radioanalytical and Nuclear Chemistry
  • [Show abstract] [Hide abstract]
    ABSTRACT: A set of experiments was carried out to evaluate the strontium uptake potential of spent coffee grounds (SCG) by batch tests in aqueous medium. Adsorption of Sr2+ as a function of contact time and adsorbent dose, pH, particles size, agitation speed, temperature and co-ions presence was investigated. Obtained results revealed that the maximum adsorption took place at pH range of 5–8 and temperature values between 283 and 333 K. Particles size effect was not very significant and agitation speed influenced on the equilibrium time. Competitive adsorption experiments allowed us to classify the negative effect on the Sr2+ uptake according to this order Al3+ ≫ Co2+ > Mg2+ > Ca2+ ≫ Na+ > K+ > Cs+. Kinetic study indicated that the Sr2+ uptake was fast and it was well fitted by the pseudo second order reaction model. Adsorption isotherm was well interpreted by Langmuir model. The maximum adsorption capacity was found to be 69.01 mg g−1 at pH 7, 293 K, particles sizes = 200–400 μm and agitation speed 250 rpm. The thermodynamic study revealed that the process was spontaneous (ΔG 0 < 0), exothermic (ΔH 0 < 0) with a raised affinity for Sr2+ (ΔG 0 < 0, ΔS 0 > 0) and occurred by physical adsorption (E a = 8.37 kJ mol−1). FTIR analysis showed carboxylic acid and amino group presence on SCG surface playing a vital role in Sr2+ biosorption.
    No preview · Article · Nov 2013 · Journal of Radioanalytical and Nuclear Chemistry
  • [Show abstract] [Hide abstract]
    ABSTRACT: The simulated radionuclides Sr and Nd were simultaneously separated from high level liquid waste (HLLW) using in situ hydrotalcite synthesis. The optimum conditions of removal of Sr and Nd determined by acid–base titration, single factor test and X-ray powder diffraction (XRD) are that the initial C Nd(III), initial C Sr(II), pH range and (Sr + Mg)/(Nd + Al) molar ratio are 70, 90 mg L−1, 10–11 and around 3, respectively. Both the removal rates of Sr and Nd could reach more than 99 % under these conditions. The synthetic samples were characterized by XRD, Fourier transform infrared spectroscopy, scanning electron microscope. The results indicate that as-synthesized samples possess single hydrotalcite phase, which confirms that Sr and Nd separated from HLLW are all embedded into the crystal lattice of Sr–Nd-HTlcs. In addition, the morphology of Sr–Nd-HTlcs is in hexagonal platelet-like sheets and the particle size is about 1 μm. From the XRD patterns of Sr–Nd-HTlc calcination product, we only observe the phases of spinel and MgO and don’t find the phases of SrO and Nd2O3, which show that Sr and Nd embedded into the crystal lattice of Sr–Nd-HTlc still occur in the structure of spinel.
    No preview · Article · Nov 2013 · Journal of Radioanalytical and Nuclear Chemistry
Show more