Adsorption of Cu (II) and Cd (II) from Wastewater by Sodium Alginate Modified Materials

Abstract

Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g−1, and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).

M2+(Ni, Cu, Zn)/Al-LDH Composites with Hydrochar from Rambutan Peel and Study the Adsorption Efficiency for Organic Dyes

“…Table 2 shows the Langmuir and Freundlich isotherm data in the form of Langmuir constant (kL), maximum adsorption capacity (qm), adsorption intensity (n), and Freundlich constant (kF). Table 1 shows the Langmuir data at the Langmuir constant value (kL) of 0.070, 0.080, 0.025, 0.074, 0.040 and is in the range of 0 and 1 which identifies a suitable system for the adsorption process (Mishra et al, 2020;Zhao et al, 2020). The qm data shows the value of large adsorption capacity on the adsorbent of LDH-Hc composite materials (Ni/Al-Hc, Cu/Al-Hc, Zn/Al-Hc) reaching 144.928 mg/g, 175.439 mg/g, 217.910 mg/g while rambutan peel precursors and Hc had lower adsorption capacities of 43.860 mg/g and 49.286 mg/g, respectively.…”

Fabrication of Eco-Friendly Polyelectrolyte Membranes Based on Sulfonate Grafted Sodium Alginate for Drug Delivery, Toxic Metal Ion Removal and Fuel Cell Applications

“…The Q e values of this study were reported as 53.29 for Cu(II) and 129.28 for Ni(II). Zhao et al developed sodium alginate-polyethylene glycol oxide-nano materials based composite gels for the removal of heavy metal ions such as Cu(II) and Cd 2+ from polluted water [ 52 ]. In this study, the fabricated materials showed the adsorption capacity (Q m ) for Cu(II) and Cd(II) as 6.78 and 3.43 with the removal rates 96.8% (Cu(II)) and 78% (Cd(II)).…”

“…The Qe values of this study were reported as 53.29 for Cu(II) and 129.28 for Ni(II). Zhao et al developed sodium alginate-polyethylene glycol oxide-nano materials based composite gels for the removal of heavy metal ions such as Cu(II) and Cd 2+ from polluted water [52].…”

Study on the Performance of Composite Adsorption of Cu2+ by Chitosan/β-Cyclodextrin Cross-Linked Zeolite

“…For example, the removal of metal ions is incomplete, requiring higher reagents and energy, producing toxic sludge or other wastes, and taking a long time to desorb [3]. Adsorption is considered as an effective method to treat heavy metal pollution in wastewater [4]. The principle of adsorption method is to use the porous structure of adsorbent and the physical properties of large surface area to adsorb pollutants in water, to achieve the purpose of removing heavy metals in water [5].…”