ZnAl-Humic Acid Composite as Adsorbent of Cadmium(II) From Aqueous Solution

Jeri Rahmadan, Veronika Parhusip, Neza Rahayu Palapa, Tarmizi Taher, Risfidian Mohadi, Aldes Lesbani


The modified ZnAl composites with humic acid (HA/ZnAl composite) were a coprecipitation method used as an adsorbent to remove cadmium(II) in an aqueous solution. The synthesized material was characterized using SEM-EDX, FTIR, and XRD. From the analysis using XRD, there is a widening peak at an angle of 2???? (24°), FTIR analysis there is a new peak at 1000 cm−1 and 1220 cm−1 and SEM analysis show that there is a change in surface morphology due to more aggregated particles. The experimental results on HA/ZnAl composite followed the PSO model, where the cadmium(II) removal process was chemical adsorption. The adsorption isotherm follows the Langmuir model where adsorption occurs in a monolayer and maximum adsorption capacity was obtained 38.76 mg/g higher than pristine. Thermodynamics of the adsorption process of cadmium(II) in an aqueous solution occurred spontaneously where G < 0 at all temperatures and endothermic properties were tested. The performance of the HA/ZnAl composite showed that strong potential as an adsorbent of low cost, high efficiency, easy operation, and good reusability. The cadmium(II) was absorbed on the surface of HA/ZnAl composite by surface complexation and chelating interactions, and surface complexation was the main route of cadmium(II) removal. In addition, HA/ZnAl composite has excellent treatment efficiency in actual aqueous solution.


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Jeri Rahmadan
Veronika Parhusip
Neza Rahayu Palapa
Tarmizi Taher
Risfidian Mohadi
Aldes Lesbani
aldeslesbani@pps.unsri.ac.id (Primary Contact)
Rahmadan, J., Parhusip, V., Palapa, N. R., Taher, T., Mohadi, R., & Lesbani, A. (2021). ZnAl-Humic Acid Composite as Adsorbent of Cadmium(II) From Aqueous Solution. Science and Technology Indonesia, 6(4), 247–255. https://doi.org/10.26554/sti.2021.6.4.247-255

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