PHOTOCATALYST ACTIVITY OF MgO FROM BANGKALAN DOLOMITE

Abstract

In the industrial sector, water pollution due to dye waste needs special attention because it can harm humans and the environment. A waste-absorbing material with good photocatalytic properties is required to overcome this problem. The photocatalytic properties are owned by metal oxide materials, one of which is Magnesium Oxide (MgO) material. This study aims to analyze the activity level of MgO photocatalytic from Bangkalan dolomite. MgO synthesis was carried out by the leaching method, where UV-Vis characterized the results to determine the photocatalytic ability of MgO against methylene blue (MB). In this characterization, various treatments (sunlight, UV light, and darkroom conditions) were carried out with radiation times of 180, 240, and 300 minutes. The results of the UV-Vis spectrum analysis showed that MgO had a band gap of 4.01 eV. The degradation efficiency of photocatalytic obtained optimal under sunlight, UV light, and in a dark room with a radiation time of 300 minutes at 82%, 42%, and 34%. Thus, the synthesis of MgO in sunlight showed good photocatalytic activity in reducing MB dye to use for processing waste from the dye industry.

Irradiation Time Optimization on Photocatalytic Activity of Nanoparticles MgO from Dolomite Bangkalan

“…Referring to research from Rahmawati and Rohmawati [11], they synthesized MgO using the leaching method, first by sifting dolomite powder using a 200-mesh sieve. Furthermore, 50 g of dolomite was dissolved in 210 mL of 5 M HCl and then stirred using a stirrer at 300 rpm at 75 °C until a solution formed a slurry.…”

“…The photocatalytic activity of MgO is very effective, considering that the removal of dyes in water by coagulation, flocculation, and adsorption techniques only moves the dyes from the liquid phase into the solid phase and does not decompose the compounds in the dyes so that the color particles can agglomerate and cause new pollution. Research conducted by Rahmawati and Rohmawati [11] showed the photocatalyst process using MgO on methylene blue dye, which was carried out under sunlight, UV light, and dark room with a time of 180, 240, and 300 min showing a degradation rate of 82, 42, and 34 %, respectively. Yadav et al [12] pointed out the same regarding the effectiveness of MgO in photocatalytic activity to degrade methylene blue dye under sunlight and UV light, with degradation percentages of 97 and 92 %, respectively.…”