Fe3O4-SiO2-Alginate Photocatalyst for Textile Dyes Waste Degradation

Abstract

Fe3O4 is a photocatalyst that is used to degrade textile dye waste which can be collected and reused. Fe3O4 was prepared by coprecipitation method, then impregnated with SiO2 and sodium alginate. The purposes of this study were to investigate the degradation of textile dye waste using a Fe3O4-SiO2-alginate photocatalyst, to examine the light and dark test of photocatalyst under the influence of concentration and irradiation time. The type of light used was a 14.5-watt Philips LED lamp with a wavelength of 400-640 nm. Photocatalyst characterizations were conducted using FTIR, UV-Vis DRS, and XRD. The light and dark test of photocatalyst was carried out by photodegradation of textile dye waste with 0.5 g of photocatalyst with concentrations of 5%, 10%, and 15% and irradiation times were varied for 60, 90, 120 min. The degradation results were measured by calculating the COD value. The results of characterization by FTIR showed that the photocatalyst Fe3O4-SiO2-Alginate had absorption at wavelengths of 637.56 cm−1 and 3365.86 cm−1 which indicated the Fe-O-Si functional group and O-H stretching vibration. Results of UV-Vis DRS were analyzed using Origin Pro 2022 and revealed that the band energy gap for Fe3O4 and Fe3O4-SiO2 were 2.20 eV and 1.77 eV, respectively. The XRD results analysis with Match!3 software showed that for Fe3O4 had magnetite phases, while SiO2 had amorphous cristobalite phases. The 15% (w/v) Fe3O4 concentration in the form of powder and granules degraded batik liquid waste by 79.6% and 84.48%, respectively.

Synthesis and characterization of Fe3O4/SiO2/Alginate photocatalyst from tin tailings for batik cual waste degradation

“…In a 100 mL beaker, 0.05 g of Fe3O4 was combined with 30 mL of 96% ethanol and then stirred for one hour using a magnetic stirrer. The mixture was then stirred for 3 hours at 30 o C, after which the Fe3O4:SiO2 ratio was modified by 15% (w/w) for 1 g. The residue of Fe3O4/SiO2 was dehydrated and calcined at 500 °C for four hours [8] 2.5 Synthesis of Fe3O4/SiO2/Alginate Photocatalyst The photocatalyst Fe3O4/SiO2 was impregnated with sodium alginate gel to create granular particles for use in calcium chloride solution. 2 g of sodium alginate was dissolved in 13 mL of distilled water, agitated with a magnetic stirrer, and heated at 40 degrees Celsius until a gel phase formed.…”

“…The suspension was then injected with a syringe into a 10% (b/v) calcium chloride solution. The resulting complex Fe3O4/SiO2/Alginate particles were separated and dried at 120°C until completely dry [8] IOP Publishing doi:10.1088/1755-1315/1267/1/012059…”

“…Where C before (COD value before COD test), C after (COD value after COD test) [8] 3. Result and Discussion…”

“…Alginate is widely used as a thickener, gelling agent, and emulsifier because it is non-1267 (2023) 012059 IOP Publishing doi:10.1088/1755-1315/1267/1/012059 2 toxic, economical, and can be used as a protective material for SiO2 supports [7]. Wardhani et al [8] succeeded in synthesizing Fe3O4/SiO2/Alginate made from rice husk silica and was able to degrade dye waste up to 84.48% with a Fe3O4 band gap energy of 2.20 eV and when SiO2 was added the band energy decreased to 1.77 eV. The increase in SiO2 content causes the sample gap energy to become smaller.…”

Synthesis and characterization of Magnetic Fe3O4/SiO2 composite for Environmental Sanitation

“…The cristobalite phase is identified by comparing the SiO2 sample with the PDF of Cristobalite No. 96-101-0922 [9].…”