Effect of Al Concentration over ZnO-Al2O3 Physicochemical Characteristics and Removal of Remazol Red RB

Widya Purwaningrum; Fingky Pristika Sari; Julinar; Adiq Ahmadi; Muhammad Said

Widya Purwaningrum Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya, Sumatra Selatan, 30662, Indonesia
Fingky Pristika Sari Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya, Sumatra Selatan, 30662, Indonesia
Julinar Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya, Sumatra Selatan, 30662, Indonesia
Adiq Ahmadi Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya, Sumatra Selatan, 30662, Indonesia
Muhammad Said Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya, Sumatra Selatan, 30662, Indonesia

Keywords: Composites, ZnO-Al2O3, Photodegradation, Photocatalyst;, Remazol Red RB

Abstract

ZnO is one of the widely used semiconductors due to its high photocatalytic activity. The inactivity of ZnO in the visible range could be enhanced by combining the ZnO with Al. In this study, the photocatalytic activity of ZnO-Al₂O₃ on Remazol Red RB was investigated. The effect of the ratio mass of ZnO-Al₂O₃ (1:0.05, 1:0.07, and 1:0.10) was also evaluated. The photocatalyst would be characterized using XRD, SEM-EDX, and UV-Vis DRS. The characterization showed that photocatalysts were successfully synthesized. The XRD analysis showed that the optimum ratio mass of ZnO-Al₂O₃ was achieved by 1:0.05, with the smallest crystal size of 13.3 nm. The SEM analysis showed that the surface of ZnO-Al₂O₃ (1:0.05) was easily granulated with smaller particle sizes than ZnO, and the shape tends to clump with the composites. The EDX analysis of ZnO-Al₂O₃ confirmed the presence of Zn, O, and Al elements. The photodegradation study showed that the optimum conditions were obtained at a contact time of 180 minutes at pH 6 with 91.04% dye removal. In addition, the effect of the initial concentration of the dye was achieved at 50 ppm with a dye removal of 89.26%. The study showed that the ZnO-Al₂O₃ exhibited adequate removal of Remazol red RB.

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