Escherichia coli inhibition and arsenic removal from aqueous solutions using raw eggshell matrix

Abstract

The aim of this study was to investigate the feasibility of using a raw eggshell matrix as an affordable and ecology adsorbent for the removal of As(V) from aqueous solutions. The surface morphologies of the raw eggshell matrix were analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy. Operating parameters such as the concentration of raw eggshell matrix, contact time, pH, and temperature were investigated in the removal of As(V) from aqueous solutions. In addition, desorption studies were carried out. In this study, an As(V) removal efficiency of approximately 91.43% was achieved under the optimum conditions (raw eggshell matrix = 1.0 g/L, pH = 5.97, time = 10 min). The ΔHo, ΔSo, and ΔGo provided during the process indicated that the raw eggshell matrix was applicable, spontaneous, endothermic for the removal of As(V). The Langmuir was used to calculate the maximum adsorption capacity (9.143 mg/g) of the raw eggshell matrix, and it was observed that the pseudo-second-order was suitable for the removal of As(V). It was also determined that 100 µg/L As (V) and the parameters that affect the adsorption process act as an antimicrobial agent and inhibit Escherichia coli bacteria on the raw eggshell matrix surface. According to the findings of this study, raw eggshell matrix was determined as a successful adsorbent for the removal of As(V) without any modification. Thus, it was demonstrated that the study has the potential to influence industrial symbiosis and industrial ecology approaches. This perspective will directly or indirectly contribute to cleaner production.