Biosorption of Chromium (VI) Ions using Sustainable Eggshell Impregnated Pandanus amaryllifolius Roxb. Biosorbent

Abstract

Currently, wastewater containing heavy metals treatment has been included as a significant topic for research. This is due to the effluent that is concentrated with a toxic and hazardous content which needs for a proper treatment as to reduce the environmental impacts before it can be released as an effluent. Therefore, biosorption by waste material was proposed in this study as a treatment method for this type of wastewater. The objective is focus on the comparison of the characteristics and performance of raw eggshell waste biosorbent with prepared hybrid eggshellpandan biosorbent on the removal of Cr (VI) ions in aqueous solution. From the study, it showed that the prepared hybrid biosorbent perform higher percentage in the removal of Cr (VI) ions in aqueous solution compare to the raw eggshell waste with its optimum condition at 140 min of contact time, 0.5 g of biosorbent dosage at 50 °C and pH 4 in 0.8 mg/L of solution concentration. On the other hands, the optimum conditions for the raw eggshell waste biosorbent to achieve its highest percentage removal of Cr (VI) ions in aqueous solution is 140 mins of contact time, 0.5 g of biosorbent dosage in room temperature at pH 5 in 0.8 mg/L of solution concentration. The kinetic study revealed that the adsorption model of this study follows the pseudo-second-order kinetic model of Legergren with positive value of enthalpy (16.68 kJ/mol) and entropy change (0.0473 kJ/mol). In addition, hybrid eggshell-pandan biosorbent has a potential to become a candidate of biosorbent to the removal of Cr (VI) ions in wastewater.

Molecularly Imprinted Polymer Solid-Phase Extraction (MISPE) for the Determination of Dinitro-ortho-cresol (DNOC) and Its Risk Assessment in Tomatoes

“…This analysis assumes that adsorption occurs on the monolayer (Rahman et al, 2018). In other words, since no more layers are formed once the monolayer is established, the surface of the adsorbent reaches a saturation point, and the maximum adsorption capacity on the surface of the adsorbent is achieved (Yahya et al, 2021). For the Freundlich model, the isotherm constant (Kf) is calculated from the slope and is an intercept of the slope obtained from the plot of ln Ce against ln qe.…”

Effect of Calcination Temperature on The Properties of Eggshell Waste (EW) Powder for Biomedical Application

“…An eggshell is made up of 94% CaCO3 or also known as calcite form, 1% magnesium carbonate (MgCO3), 1% calcium phosphate (Ca3(PO4)2), and 4% organic material 14),15), 16) . After some research, eggshells are helpful for many applications such as biodiesel catalyst 17) , adsorbent to remove chromium 18) , reinforcement in fabricating the aluminium-based composite material 19) , and calcium precursor in calcium phosphate (CaP) production 20) .…”