The effect of alkaline activation on the zeolite binding properties toward dissolved irons

Abstract

This research aims to determine the effect of alkaline activation on the zeolite binding properties toward dissolved irons. Natural zeolite was activated by reflux using NaOH with various concentrations (2 N, 4 N, and 6 N). Furthermore, the activated zeolite was mixed into a solution of FeSO4.7H2O 0.5 M. Zeolite-Fe then characterised using FTIR, XRD, and SEM. The optimum contact time and the adsorption of irons by activated zeolite were studied. The result shows that alkaline activation in zeolite caused a change in structure zeolite as evidenced by FTIR spectra. The data from XRD result have also identified diffraction patterns of alkaline activated zeolites run into differences in the peak characteristics of their constituent and changing the degree of crystallinity of the mineral structure in zeolites. Besides, it also observed that NaOH activation of zeolites increased the amount of Fe bound to zeolite as evidenced by changes in colour and SEM results. The optimum contact time is 2 minutes and the adsorption kinetics of irons were fitted well with the pseudo-second-order kinetic model.

Effect of NaOH Concentration Toward the Characteristics of Activated Natural Zeolite from Blitar – East Java

“…They are the asymmetric vibration band of the O-Si-O or O-Al-O bonds [1]. Asymmetric stretching vibration bands of Si-O or Al-O are also observed at 1052.54 cm -1 , 1045.41 cm -1 , and 1046.84 cm -1 [18]. The shift of the peak to a lower wavenumber is caused by activation with alkaline solutions such that the Si-O-Si and Al-O-Al covalent bonds in the aluminate and silicate groups are affected [18].…”

“…The zeolite mass and yield data in this study are presented in Table 1. The decrease in zeolite yield was due to the dissolution of some metal oxides contained in the pores or channels where base activation is one of the modification techniques that aim to reduce the percentage of silicon (Si) thus that the zeolite has larger pores and becomes more hydrophilic [18,26].…”

“…Physical activation is a process of reducing the particle size of zeolite or heating it at high temperatures to increase its ability, such as the surface will get bigger and water molecules will be removed from the zeolite framework. In addition, chemical activation involves mixing zeolite with acid or base solution to remove impurities like metal-oxide and change pore size, acidity, and Si/Al ratio [18,19,20].…”

The Effect of Chemical Activation Using Base Solution With Various Concentrations Towards Sarulla Natural Zeolite

“…The desiliconization leads predominantly to the removal of silicon from the zeolite body. Figure 2 shows the asymmetric stretch of TO 4 functional group that appears at 900-1250 cm -1 wavenumber (Rahmayani et al, 2020). Asymmetric stretch in ANZ appears at 1042.35 cm -1 wavenumber.…”

“…This has led to superior catalytic performance. Rahmayani et al (2020) has activated zeolite by using NaOH at concentration of 2 N, 4 N and 6 N to bind dissolved iron. The study reported that NaOH-activated zeolite can increase the amount of Fe attached to zeolite.…”