Impregnation of ZnO onto a Vegetal Activated Carbon from Algerian Olive Waste: A Sustainable Photocatalyst for Degradation of Ethyl Violet Dye

Abstract

This study is aimed at developing a simple and low-cost method to fabricate ZnO-loaded porous activated carbon (AC-ZnO) prepared from the Algerian olive-waste cakes and utilize it as a photocatalyst for the degradation of Ethyl Violet dye. The synthesized AC-ZnO material was characterized using powder X-ray diffraction, BET surface area measurements, Raman microscopy, thermogravimetric analysis, UV-visible diffuse reflectance spectroscopy, and zeta potential measurements. The degradation efficiency was evaluated with Ethyl Violet (EV) dye in aqueous solution under UV irradiation supplied by a Xenon arc lamp through a Pyrex glass filter (cutoff 280 nm), and the degraded products were identified by using electrospray ionization mass spectroscopy. Additional experiments were carried out under N 2 flow and with isopropyl alcohol to examine the role of superoxide and hydroxyl radicals, respectively. The amount of • OH radical formed on irradiated AC-ZnO was tested with terephthalic acid which can act as a chemical trap for the • OH radicals. The results from this study indicate that the AC-ZnO is a potential catalyst for the pollutant removal and the • OH radicals are the key species for the degradation of EV. Further, this study opens up an opportunity to produce cheaper activated carbon support from olive wastes for environmental remediation applications.

PengaruhVariasi Konsentrasi Zno Pada Karbon Aktif Terhadap Band Gap Setelah Impregnasi

“…Alat dan Bahan Alat-alat yang digunakan dalam penelitian ini adalah peralatan gelas kimia, ayakan 100 mesh, spatula, cawan porselen, krus porselen , pipet volumetri, pipet ukur dan UV DRS.Sedangkan bahan yang digunakan yaitu karbon aktif dari batang kelapa sawit, aquadest dan Zn(NO 3 ) 2 .6H 2 O B. Prosedur Penelitian Karbon aktif diimpregnasi dengan Zn(NO 3 ) 2 .6H 2 O. Sebanyak 5 g karbon aktif dicampurkan kedalam Zn(NO 3 ) 2 .6H 2 O dengan konsentrasi masing-masing 5g/ 100 mL; 10g/ 100 mL; 15g/ 100 mL; 20g/ 100 mL; dan 25g/ 100 mL aquades. Campuran diimpregnasi pada suhu kamar selama 24 jam (Abdessemed, Rasalingam, Abdessemed, Djebbar, & Koodali, 2019) dan di shacker selama 6 jam dengan kecepatan 250rpm. Setelah itu katalis di saring dan di keringkan dalam oven pada suhu 100°C hingga padatan kering, kemudian dipanaskan dalam furnace pada suhu 300°C selam 3 jam.…”

Visible light photocatalytic degradation of organic dyes using W‐modified TiO2/SiO2 catalyst

“…To investigate their role in the degradation of MB assisted by W-modified TiO2/SiO2 catalyst, decomposition experiments were conducted with the addition of KI, IPA, BQ, and DMSO which were reported to be highly reactive to h + , • OH, • O 2and e -, respectively. [43][44][45] It is clear that the presence of all four scavengers hinders the decolorization of MB, RhB, MO and CR dyes. DMSO The photocatalytic activity of W-modified TiO2/SiO2 in the visible light region can be explained by the photocatalytic mechanism of the semiconductors.…”

Valorisation of Fruits, their Juices and Residues into Valuable (Nano)materials for Applications in Chemical Catalysis and Environment

“…In 2009, Martínez and Venturini successfully demonstrated the synthesis of copper decorated on activated carbon. [226] They used industrial rubbishes such as grape stalk and apricot core as a source for the activated carbon and a copper salt that In 2019, Abdessemed et al successfully developed an efficient and simple method for the synthesis of ZnO NPs loaded on porous activated carbon (ACÀ ZnO) [227] from Algerian olive-waste cakes. The synthesized ACÀ ZnO was used as a catalyst for Ethyl Violet degradation.…”

“…In 2019, Abdessemed et al . successfully developed an efficient and simple method for the synthesis of ZnO NPs loaded on porous activated carbon (AC−ZnO) [227] from Algerian olive‐waste cakes. The synthesized AC−ZnO was used as a catalyst for Ethyl Violet degradation.…”