Brilliant green dye adsorption onto composite snail shell-rice husk: Adsorption isotherm, kinetic, mechanistic, and thermodynamics analysis

摘要

This study examined the potential for a composite of snail shell-rice husk (SS-RH) to successfully remove brilliant green dye (BGD) from aqueous solutions using the batch adsorption method. The adsorbent was synthesized by the calcination process and prepared at a calcination temperature, calcination time, and SS-RH mixing ratio of 681.10℃, 2.61 hours (h), and 2.61 mixing ratio, respectively. The SS-RH active functional groups were characterized by the Fourier transform infrared (FTIR) spectroscopy, while examination of its surface morphology was executed by scanning electron microscope. The effects of the BGD's initial concentration, time, pH, solution temperature, adsorbent mass dosage, and rotation speed of the stirrer on it removal were examined. The Langmuir and Sip isotherms fit well for the BGD uptake onto the SS-RH among the two-parameter and three-parameter isotherms examined with R2 values of 0.9995 and 1,000, and optimum adsorption capacities of 129.87 and 123.30 milligrams per gram (mg/g), respectively. Experimental data conformed perfectly using a pseudo-second-order kinetic model. The thickness of the boundary layer contributed to the adsorption, as revealed by mechanistic parameters. Thermodynamic adsorption parameters suggested that BGD adsorption onto the SS-RH was nonspon-taneous and endothermic, exhibiting a high level of disorderliness at the solid-liquid interface. The results proved SS-RH to be a valuable, low-cost adsorbent for BGD adsorption from aqueous solution.