A novel Magnetic Fe-Co-Zn composite as an effective and recyclable adsorbent for dyes adsorption from wastewater

Abstract

Abstract Removal of pollutants from wastewater has always been a concern. Adsorbent materials formed on the basis of activated carbon are promising adsorbents for the removal of organic pollutants from the aqueous phase as a result of their rich pore structure and high chemical activity. However, the majority of ACs exist as micro-crystalline powders, making them complicated to segregate and recycle. Therefore, in this paper, a new magnetic adsorbent (AC-CN-Fe-Co-Zn) doped with iron, cobalt and zinc was prepared by impregnation and calcination for the adsorption of Methylene blue (MB) and Acid blue (AB80). The prepared AC-CN-Fe-Co-Zn was characterized by SEM, TEM, XRD, BET, and Raman. For the ensuing series of experiments, the effects of pH, binding time, temperature and initial concentration on the adsorption behaviors of MB and AB80 by AC-CN-Fe-Co-Zn were investigated. The results demonstrate that the inorganic ions in the magnetic material display excellent dispersion on the surface of carbon material and the pseudo-second-order kinetic model is an accurate representation of the adsorption data. The thermodynamic adsorption curves are consistent with the Langmuir model. The adsorption mechanism involves the critical contribution of hydrogen bonding interaction, π-π interaction, pore adsorption, and electrostatic attraction. The maximum adsorption capacities of MB and AB80 were 83.40 mg/g and 35.36 mg/g respectively. Following 5 iterations of utilization, the eradication effectiveness for MB and AB80 were 79.82% and 61.54% respectively. The results confirmed that the comprehensive properties of AC-CN-Fe-Co-Zn make it an excellent and efficient adsorbent for the removal of dyes. This paper provides a new sight on the synthesis of high efficiency adsorbents for dyes pollutant separation.