Fixed-Bed Column Adsorption Studies of Methylene Blue Dye from an Aqueous Solution Using Silicon Nitride Adsorbent Synthesized from Sand and Coffee Husk Wastes

This study presents a fixed-bed column adsorptive behavior of Silicon Nitride (Si۳N۴) adsorbent for Methylene blue dyes. The adsorbent was characterized using XRD and EDX. Effect of parameters such as influent concentrations, volumetric flow rate, and bed height for the column study are explored. The Yoon-Nelson, Thomas, and Adam-Bohart models were used to predict breakthrough curves. The results showed α-Si۳N۴ as the main adsorbent phase with Silicon and Nitrogen as the main elements. A column capacity (۴۷.۰۱ mg/g) was reported at optimal values of ۴ mL/min, ۷ cm and ۵۰ mg/L. Column dynamic modeling analysis revealed that Thomas and Yoon-Nelson models best fitted the breakthrough curves than Adam-Bohart model. The column performance using spiked water samples Athi showed that Si۳N۴ adsorbent had a lower efficacy than in a model solution with the maximum column adsorption capacity of ۳۸.۹۲ ± ۰.۰۴ mg/g. The results revealed the potential of Si۳N۴ adsorbent for decontamination of MB dyes from wastewater.

کلیدواژه ها:

Methylene blue (MB) dye ، Fixed-bed ، Adsorption ، breakthrough curves