The Effect of Orange Peel addition and Orange Peel-CTAB modification on the ability of ZnO to degrade Methylene Blue under UV Irradiation
Aulia Dewi Rosanti, Yuly Kusumawati, Fahmi Hidayat, Arif Fadlan, Karinda Septiyaningrum

Departement Of Chemistry, Universitas Islam Kadiri
Departement Of Chemistry, Institut Teknologi Sepuluh Nopember

Abstract

The dyes in the textile industry can cause major environmental problems due to azo compounds contained as difficultly degraded material. Photodegradation is an inexpensive and environmentally friendly method of removing synthetic dyes. This study aimed determine the effect of orange peel (OrPl) and OrPl- Cetyltrimethylammonium Bromide (CTAB) addition on photocatalyst semiconductor properties of ZnO and its ability to degrade Methylene Blue (MB). ZnO, ZnO/OrPl, and ZnO/OrPl-CTAB materials were characterized using FTIR, XRD, BET, SEM EDX and DR-UV. Based on FTIR results ZnO peaks were formed directly during the decomposition of zinc acetate. In addition, the absence of typical CTAB absorption indicates a complete calcination process. Based on the results of characterization using XRD, the addition of OrPl-CTAB to ZnO did not damage the crystal structure and crystal form. The crystal structure of ZnO/OrPl and ZnO/OrPl-CTAB formed was wurtzite with a hexagonal shape. The results of characterization using BET showed that OrPl-CTAB addition caused a largest surface area and pore size compared to ZnO and ZnO-OrPl. The results of characterization using DR-UV showed that the narrowest band gap energy was ZnO/OrPl-CTAB 1:25 is 3.153 eV showing smaller band gap energy than ZnO. Based on the characterization results, the material with the best character was ZnO/OrPl-CTAB with the addition of 25 mL(1:25) Zn Acetate. In addition, ZnO/OrPl-CTAB material was better than ZnO and ZnO/OrPl in degrading MB. In the without UV irradiation method, the optimum conditions were obtained at 110th minutes for ZnO/OrPl-CTAB to degrade MB by 78%, while ZnO/OrPl and ZnO were only able to degrade by 71% and 46%, respectively at 100th minutes. Meanwhile, under UV irradiation method, the optimum condition were obtained for ZnO/OrPl-CTAB to degrade MB at 110 minutes by 94% while ZnO/OrPl was only 88% and ZnO 83% at 100 minutes.

Keywords: Photocatalyst, Orange Peel, CTAB, Methylene Blue, ZnO/OrPl-CTAB

Topic: Materials Sciences: Synthetic and Characterization