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Vol. 31 No. 6 (2019): Vol 31 Issue 6

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Degradation of Anionic Dye (Acid Orange II) by Bentonite Supported Nano-Zero Valent Iron

https://doi.org/10.14233/ajchem.2019.21909
N.A. Zarime
Geology Programme, School of Environmental Sciences and Natural Resources, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
W.Z. Wan Yaacob
Geology Programme, School of Environmental Sciences and Natural Resources, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
H. Jamil
Geology Programme, School of Environmental Sciences and Natural Resources, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Corresponding Author(s) : N.A. Zarime

aishahzarime@gmail.com

Asian Journal of Chemistry, Vol. 31 No. 6 (2019): Vol 31 Issue 6

Abstract

The nano-zero valent iron (nZVI) has been reported as an excellent material to decolourize the anionic dyes. Aggregation of nZVI tends to reduce its reactivity. Due to this reason, modifications of nZVI were applied by using bentonite. Bentonite supported nano-zero valent irons (B-nZVI) was synthesized by using reduction method of ferrous ions and sodium borohydride in presence of bentonite. The objective of this study was to evaluate the performance of composite nanoscale zero-valent iron (nZVI) in decolorized of acid orange II from aqueous solutions. All the three adsorbent materials (nZVI, B-nZVI and bentonite) were characterized by physical, chemical, mineralogical and morphological properties such as Brunnaer-Emmett-Teller (BET) surface area, X-ray photoelectron spectroscopy with auger electron spectroscopy (XPS-AES), field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The batch adsorption tests for all adsorbent materials have been conducted to determine the effectiveness of both materials in dye removal. The five effects have been analyzed in Batch test among others concentration, dose, pH, kinetic and temperature. The study found in all effects, B-nZVI (qe opt = 8.9286 mg/g) showed the higher adsorption capacity followed by nZVI (qe opt = 8.1224 mg/g) and bentonite (qe opt = 5.8469 mg/g). The effectiveness of B-nZVI was due to the dispersion of nZVI particles bentonite particles, consequently provided more sites for adsorption. This study discovered that B-nZVI has a high potential to be a low-cost adsorbent for decolorized anionic dye from synthetic dye wastewater.

Keywords

Acid orange II Bentonite Composite nano zero valent iron Batch test
Zarime, N., Wan Yaacob, W., & Jamil, H. (2019). Degradation of Anionic Dye (Acid Orange II) by Bentonite Supported Nano-Zero Valent Iron. Asian Journal of Chemistry, 31(6), 1305–1310. https://doi.org/10.14233/ajchem.2019.21909
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