Abstract
The research studied the removal of copper ions from simulated wastewater by adsorption on natural and simulated with microwave electromagnetic radiation bentonite (EMR-stimulated bentonite). X-ray diffraction was employed to study the structure of the natural bentonite, which was proved to contain hydromica, montmorillonite, quartz, and chlorite. The maximal removal rates of Cu 2+ were 20.5 % and 29.1 % for natural and EMR-stimulated bentonite, respectively. The experimental data of copper adsorption were fitted with theoretical isotherms (Langmuir, Freundlich, Redlich-Peterson, Toth, and Langmuir-Freundlich) using non-linear modeling. The adsorption on natural bentonite followed the Langmuir model, while the Langmuir-Freundlich model fitted the adsorption on EMR-stimulated bentonite. The isotherms were used to calculate the maximal adsorption capacities, which were 11.82 and 25.74 mg/g for natural and EMR-stimulated adsorbents, respectively. The electromagnetic treatment stimulated the formation of the new adsorption sites, improved the pores structure, and influenced the surface charge. The specific adsorption and surface precipitation were involved in the adsorption on EMR-stimulated adsorbent
Highlights
The lines for adsorption on natural and stimulated samples are almost parallel, which indicates the involvement of similar adsorption mechanisms
The results indicate that the electromagnetic radiation improves the adsorption capacity: the stimulated
The results of our study proved that the action of micro
Summary
The humanity entered XXI century with the significant advances in technology & industry and severe environmental issues. The industrial production causes the extensive use of resources, including water. Freshwater is a valuable resource for a comfortable life of humanity, and it is vital for survival. The issue of wastewater treatment is of particular concern for the modern science [1]. Physicochemical and biological methods are used for the natural and wastewater purification (aeration, sedimentation, filtration, sorption with synthetic and natural materials, etc.). The main requirements for the wastewater treatment are as follow: high recovery rate, the absence of secondary pollution, cost-efficiency, and simple application technology [2]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
