Removal of Cd(II) and Cu(II) from Aqueous Solution by Na⁺-Modified Pisha Sandstone

Abstract

Heavy metals have caused serious environmental issues, which are enriched during open-cast coal mining. It is urgent to develop sustainable remediation materials to protect and restore the contaminated soil and aquifers in mining areas. The feasibility of applying Pisha sandstone (PS) and Na+-modified Pisha sandstone (Na-PS) for adsorption of heavy metals was evaluated. Na-PS exhibited maximum Cd(II) and Cu(II) removal rates of 65.9% and 99.8%, respectively, exceeding the corresponding values for PS (8.2% and 1.3%, respectively) in 1 × 10−3 M solution. Efficient heavy metals adsorption occurred in the pH range 5.0–6.0. The adsorption of Cu(II) and Cd(II) on PS and Na-PS was characterized by kinetic models and adsorption isotherms and was well represented by pseudo-second-order kinetics (R2 > 0.99) and the Langmuir and Freundlich isotherm models. The values of the thermodynamic parameters indicated that the interactions were spontaneous endothermic reactions. Binary solutions adsorption isotherms indicated that the linearity of the adsorption amount and initial concentration of Cu(II) and Cd(II) was better in certain ranges and the adsorbents were selective towards Cu(II) rather than Cd(II). Therefore, PSs can be used as excellent adsorbents for Cu(II) and Cd(II) remediation from contaminated surface water.

Investigation of clay brick waste for the removal of copper, nickel and iron from aqueous solution: batch and fixed – bed column studies

“…These results contrast with the findings of Abdel et al (2011) whose data fit the Langmuir model better than the Freundlich model for the removal of heavy metals from wastewater using low-cost adsorbents. However, the study is comparable to the study conducted by Wang et al (2020) on the adsorptive removal of divalent copper and cadmium ions from the aqueous solution using Na þ modified Pisha Sandstone. Furthermore, the results are comparable to the findings reported by Hemalatha and Rao (2014) where the data fit both the Langmuir and Freundlich model satisfactorily for the sorption of hexavalent chromium and nickel in calcined brick powder.…”

Synthesis and Characterization of Amorphous Iron Oxide Nanoparticles by the Sonochemical Method and Their Application for the Remediation of Heavy Metals from Wastewater

“…As a result, competition occurred among the various heavy metal ions for the limited binding sites. When all the adsorption sites are occupied and there is no further scope for the accommodation of new heavy metals ions, then it is assumed that the reaction has reached equilibrium [73][74][75]. At this point there will be maximum adsorption of the heavy metal ions, thereafter desorption will start.…”

The Lead Removal from Industrial Wastewater Using Two-Stages Poly-Urethane Column for Further Use in Aquaculture

“…Some heavy metals including lead (Pb) are abundant in industrial wastewater, with a significant negative impact on aquatic ecosystems, groundwater, agricultural production and human health (Wang et al, 2020). Heavy metals are not biodegradable;…”