The Investigation of Removing Direct Blue 15 Dye from Wastewater Using Magnetic Luffa sponge NPs

Abstract

In this study, loaded Luffa sponge membrane forms were modified with ZnO, Fe 3 O 4 , ZnO/ Fe 3 O 4 nanoparticles (NPs) to remove of Direct Blue 15 (DB15), which is a carcinogenic azo dye in aqueous solution. ZnO and Fe 3 O 4 NPs were synthesized using purified peroxidase enzymes from Euphorbia amygdaloides using green synthesis method. Adsorption of DB15 azo dyes was separately studied with membrane forms (LS-pure, LS-ZnO, LS-Fe 3 O 4 , and LS-ZnO/Fe 3 O 4). Optimum contact time, optimum pH, optimum temperature, optimum dye concentration, and optimum LS amount were found as 45 min, pH 8.0, 20°C, 200 mg/L, and 0.025 g in line with the optimization studies, respectively. The obtained membrane forms were characterized using SEM, FT-IR, and XRD techniques. According to obtained results, NPs loaded LS membrane forms are promising in removal of DB15 from textile wastewater contaminated water.

Effect of Chemical Modifications on the Adsorptive Ability of Palm Kernel Fiber for Indigo Blue Dye

“…T h e ∆ H ° and ∆S° of the adsorption systems were obtained from the slope and intercept of the plot of 𝑙𝑛 𝐾 𝑑 against 1 𝑇 13. The positive enthalpy (∆H°) of all the adsorbents further confirmed that the adsorption is an endothermic process [26]. The positive values of entropy (∆S°) of all the adsorbents showed increased randomness at the solid-solution interface during the adsorption [27] and also signify an increase in the degree of freedom of the adsorbed species, thus favouring adsorption of Indigo dye.…”

“…The numerical value of ∆𝐺 decrease slightly with increase in temperature, implying that the reaction may be slightly spontaneous and favourable at higher temperature. It also showed an increasing tendency in the feasibility and spontaneity of Indigo dye adsorption [26].…”