Advances in environmental research

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Optimization of uranium biosorption in solutions by Sargassum boveanum using RSM method

  • Hashemi, Nooshin (Faculty of Biological Science, Alzahra University) ;
  • Dabbagh, Reza (Materials & Nuclear Fuel Research School, Nuclear Sciences & Technology Research Institute, (NSTRI)) ;
  • Noroozi, Mostafa (Faculty of Biological Science, Alzahra University) ;
  • Baradaran, Sama (Nuclear Sciences & Technology Research Institute, (NSTRI))
  • Received : 2019.10.05
  • Accepted : 2020.04.07
  • Published : 2020.03.25
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Abstract

The potential use of Sargassum boveanum algae for the removal of uranium from aqueous solution has been studied by varying three independent parameters (pH, initial uranium ion concentration, S. boveanum dosage) using a central composite design (CCD) under response surface methodology (RSM). Batch mode experiments were performed in 20 experimental runs to determine the maximum metal adsorption capacity. In CCD design, the quantitative relationship between different levels of these parameters and heavy metal uptake (q) were used to work out the optimized levels of these parameters. The analysis of variance (ANOVA) of the proposed quadratic model revealed that this model was highly significant (R2 = 0.9940). The best set required 2.81 as initial pH(on the base of design of experiments method), 1.01 g/L S. boveanum and 418.92 mg/L uranium ion concentration within 180 min of contact time to show an optimum uranium uptake of 255 mg/g biomass. The biosorption process was also evaluated by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models represented that the experimental data fitted to the Langmuir isotherm model of a suitable degree and showed the maximum uptake capacity of 500 mg/g. FTIR and scanning electron microscopy were used to characterize the biosorbent and implied that the functional groups (carboxyl, sulfate, carbonyl and amine) were responsible for the biosorption of uranium from aqueous solution. In conclusion, the present study showed that S. boveanum could be a promising biosorbent for the removal of uranium pollutants from aqueous solutions.

Keywords

Acknowledgement

Supported by : Nuclear Sciences & Technology Research Institute of Tehran, INFPPC

The research described in this paper was financially supported by the Biological Science department of Alzahra University and the Nuclear Sciences & Technology Research Institute of Tehran and INFPPC.

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