Adsorption of Pb(II) and Hg(II) ions from aqueous single metal solutions by using surfactant-modified ostrich bone waste

Abstract

In this paper, the application of a stable immobilized cetyltrimethylammonium bromide (cationic surfactant) and laundry detergent (anionic surfactant) on the surface of a biological origin support (ostrich bone waste) was reported as the novel bio-adsorbents for the removal of Pb(II) and Hg(II) ions from aqueous solution. The synthesized bio-materials were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Brunnauer-Emmett-Teller, SEM-EDX, thermal gravimetric, and point of zero charge. The removal efficiency of the bio-adsorbent was investigated as a function of contact time, pH, initial ion concentration, temperature, adsorbent dosage, and chemical modification process. Equilibrium, kinetics, and thermodynamic studies were also performed for design and evaluate the bio-adsorbents in removing Pb(II) and Hg(II) ions from aqueous solution. The modified ostrich bone with anionic surfactant indicated remarkable capability to remove Pb(II) and Hg(II) ions from aqueous solution. The results showed that the majority of Pb (91.9%) and Hg (87.7%) ions were removed within the first 0-60 min contact with the B-Detergent bio-adsorbent. Langmuir-Freundlich isotherm type model satisfactorily described the Pb(II) and Hg(II) experimental data. The adsorption process was spontaneous and endothermic in nature and followed pseudo-second-order kinetic model.

A response surface methodology for optimization of 2,4-dichlorophenoxyacetic acid removal from synthetic and drainage water: a comparative study

“…Similarly, a sharp increase in 2,4-D removal percentage was found upon increasing the temperature from 20 to 46 °C for GAC and from 20 to 60 °C for BRH. This suggests that the adsorption of 2,4-D by GAC and BRH is endothermic, which it is attributed to the formation of new active sites or enlargement of pore size on the GAC or BRH surface and increased mobility of 2,4-D molecules at higher temperatures, thus resulting in higher permeation within GAC or BRH (Amiri et al 2016;Arshadi et al 2016). In the case of MWCNTs, temperature is not an important parameter for elimination of 2,4-D from simulated wastewater.…”

“…In contrast, the Redlich-Peterson model is an adaptation of the Freundlich and Langmuir isotherm models that is suitable for microporous adsorption (Bahrami et al 2017a). In practice, two-parameter equations have received more attention due to their simplicity and high accuracy (Amiri et al 2016). Accordingly, the Freundlich model has the highest R 2 and the lowest SEE compared to the other models.…”