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Advances in Environmental Research
  Volume 9, Number 1, March 2020 , pages 65-84

Optimization of uranium biosorption in solutions by Sargassum boveanum using RSM method
Nooshin Hashemi, Reza Dabbagh, Nooshin Hashemi and Sama Baradaran

    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.
Key Words
    biosorption; uranium; Sargassum boveanum; environmental remediation; wastewater treatment
Nooshin Hashemi and Nooshin Hashemi: Faculty of Biological Science, Alzahra University, Tehran, Iran

Reza Dabbagh: Materials & Nuclear Fuel Research School,
Nuclear Sciences & Technology Research Institute, (NSTRI), Tehran, Iran

Sama Baradaran: Nuclear Sciences & Technology Research Institute, (NSTRI), Tehran, Iran

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