Comparative study for bioremediation of cobalt contaminated aqueous solutions by two types of marine macroalgae

Salem, Dalia M.S.A.; Moawad, Madelyn N.; El-Sayed, Abeer A.M.

doi:10.1016/j.ejar.2021.02.002

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…Therefore, the Table S2 compares the maximum sorption capacity of different materials for Co(II) ions. It can be seen that the ability of P. pavonica biomass to remove Co(II) ions is higher than the Co(II) sorption capacity of some adsorbents reported in the literature [1,20,31,[59][60][61][62][63][64][65][66]. The variations in the adsorption capacity of Co ions among the adsorbents may be due to differences in the morphological and physico-chemical properties of the adsorbents, including the nature of the adsorbent, particle size, specific surface area, and adsorption conditions investigated [67].…”

Section: Isotherm Model For Biosorptionmentioning

confidence: 82%

“…The presence of an amide group in algal biomass is related to the change in the band from 1546 cm −1 (untreated biomass) to 1530 cm −1 (treated biomass) [20]. Moreover, the presence of O-H and C-O stretching frequency was demonstrated by the peak at 1461 cm −1 .…”

Section: Characterization Of Biosorbentmentioning

confidence: 93%

“…To determine the optimal isotherm models of Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich, a number of experiments were carried out using different concentrations of cobalt (20,40,60,80, and 100 mg/L) under the optimum conditions of algal inoculum size of 5.98 g/L, pH of 6.73, an equilibrium time of 60 min at 25 • C.…”

Section: Isotherm Modelsmentioning

confidence: 99%

“…The influence of initial Co(II) ion concentrations (20,40,60,80, and 100 mg/L) on the cobalt removal efficiency of P. pavonica was investigated at a fixed pH value of 6.0, a contact time of 60 h, an algal inoculum size of 6 g/L, and a temperature of 25 °C.…”

Section: Biosorption Parameter Studymentioning

confidence: 99%

“…The pseudo-second-order model for P. pavonica is the same kinetic model that determines the biosorption kinetics of Co(II) ions for some biosorbents, including Sargassum sp. [45], biochar of Scenedesmus dimorphus [70], Ulva fasciata and Colpomenia sinuosa [20], or oxidized activated carbons [15].…”

Section: Adsorption Mechanismmentioning

confidence: 99%

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Model-Assisted Optimization of Cobalt Biosorption on Macroalgae Padina pavonica for Wastewater Treatment

Aloufi,

Al Riyami,

Fawzy

et al. 2024

Water

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The release of heavy metals into the environment as a result of industrial and agricultural activities represents one of the century’s most significant issues. Cobalt is a hazardous metal that is employed in a variety of industries. In this study, response surface methodology (RSM) combined with Box–Behnken design (BBD) was utilized to optimize the Co(II) ion removal from synthetic wastewater by the brown macroalga Padina pavonica. The influence of three factors, namely algal inoculum size, pH, and initial metal concentration, was assessed in optimization studies. RSM proposed a second-order quadratic model with a p-value of <0.0001 and R2 of 0.984 for P. pavonica. According to the data related to RSM optimization, the maximum percentage of Co(II) removal of 84.3% was attained under the conditions of algal inoculum size of 5.98 g/L, pH of 6.73, and initial Co(II) concentration of 21.63 mg/L. The experimental data from the biosorption process were fitted well with the Langmuir, Freundlich, and Temkin isotherm models. The maximal Co(II) adsorption capacity was estimated using the Langmuir model to be 17.98 mg/g. Furthermore, the pseudo-second-order kinetic model was shown to have the best fit for Co biosorption by P. pavonica, showing that the mechanism of Co(II) biosorption was chemisorption controlled by surface biosorption and intra-particle diffusion. Thermodynamic parameters were also investigated to evaluate the Gibbs free energy for the Co(II) ion, which was positive, showing that the biosorption process is nonspontaneous and exothermic, and the cobalt biosorption rate decreases with increasing temperature. Algal biomass was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and energy dispersive spectroscopy. These analyses revealed the biosorbent’s diverse functional groups and porous, rough appearance. Therefore, P. pavonica can be used to implement sustainable, eco-friendly, and acceptable solutions to water pollution problems.

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