Effective removal of Cr(VI) and Pb(II) ions from mining wastewater using eco-friendly synthesized magnesium oxide nanoparticles incorporated rice husk ash

This study explored the effective adsorptive performance of magnesium oxide (MgO) nanoparticles incorporated rice husk ash (RHA) to address the removal of Chromium (VI) and Lead (II) from mining wastewater from aqueous environment. MgO nanoparticles were synthesized using a magnesium salt precursor and moringa oleifera leaf extract and then impregnated onto RHA to create MgO-RHA nano composite. Different analytical techniques were employed to characterize the RHA and MgO-RHA nanocomposites. The prepared adsorbents were used in batch adsorptive studies and the concentrations of the metal ions were measured before and after treatment using atomic absorption spectrophotometry. Morphological analysis confirmed that the adsorbents developed exhibited a dispersed and porous nature. BET analysis revealed that RHA, MgO, and MgO-RHA had surface areas of 93.04, 32.02, and 102.71 m2/g, respectively. MgO-RHA outperforms RHA in removing metal ions due to its increased surface area and functionality. MgO-RHA demonstrated higher removal percentages of up to 79.20 % and 96.02 % for Cr(VI) and Pb(II), respectively. The Pseudo-second order kinetics and Langmuir isotherm demonstrated the highest degree of conformity to the experimental data, considering the coefficient of determination (R2), smallest value of SSE and chi-square (ᵪ2). Thermodynamic results indicated that the adsorption process was characterized by endothermicity, spontaneity and chemisorption controlled. In summary, the performance of the MgO-RHA nanocomposite surpassed that of RHA alone, which serves as a better adsorbent for metal ion removal

Investigative performance of activated anthill clay on the sorption of lead(II) ion from textile wastewater: Characterization, parametric optimization, isotherm, kinetics and thermodynamics studies

The increase in population have had a negative impact on the water quality environment despite the strong polices implemented on the wastewater treatment as the problem remains demanding. However, it is imperative to secure the environment of aquatic and human life. In this study, Anthill clay was activated with H2SO4 to obtain activated Anthill clay (AAC). The adsorbent was analyzed using the state of art techniques. The Brunner emitter teller (BET) surface area of AAC was 228.453 m2/g. The response surface methodology (RSM) was introduced for the optimization of lead (II) ion uptake where the removal efficiency of 92.73% was observed at optimum condition of 35 °C, 0.1g and 10 min respectively. Various adsorption parameter such as pH, temperature, adsorbent dosage and contact time was carried out. The interaction effect between the parameters were investigated. The Jovanovich model and Pseudo second order revealed the adsorption data fitted well for both isotherm and kinetics model. The thermodynamic results showed that the reaction is endothermic, spontaneous, and chemisorption in nature. From the various analysis conducted it can therefore be inferred that anthill clay can be effective and efficient for treatment of harmful substance present in wastewater