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All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)
Widia Purwaningrum
Sriwijaya University
Biochemistry, Genetics & Molecular Biology Chemistry Environmental Science

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Modification of CaO from Scallops (Amusium Pleuronectes) with Fe3O4 and SiO2 for Adsorption of Congo Red and Methylene Blue Dye Fera Rahma Sari; Widia Purwaningrum; Addy Rachmat
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 11, No 1 (2026): February 2026
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v11.i1.26

Abstract

Congo Red and Methylene Blue dye waste from the textile industry needs to be treated before being discharged into water bodies. Adsorption is widely recognized as an effective method of contaminant removal. The use of CaO as an adsorbent has the advantages of high kinetic speed, efficient, low cost, easily accessible, and abundant. To improve the performance of CaO, it is done by compositing CaO with Fe3O4 and SiO2. This study aims to synthesize a CaO/Fe3O4/SiO2 and apply it for the adsorption of Congo red and Methylene blue dyes. The synthesis of CaO/Fe3O4 uses the coprecipitation method and CaO/Fe3O4/SiO2 is synthesized using the Stober method by adding TEOS to CaO/Fe3O4. The results of XRD characterization show that the synthesized CaO, CaO/Fe3O4, and CaO/Fe3O4/SiO2 have the same 2θ angle as the reference diffractogram data. The addition of SiO2 was shown to prevent agglomeration, which was indicated by a decrease in the particle size of CaO/Fe3O4 from 70.07 to 52.42 nm in CaO/Fe3O4/SiO2. % Adsorption efficiency for Congo Red was 86.49% Methylene Blue was 99.12%. The adsorption process of both dyes was spontaneous, following a pseudo-second-order kinetic model. Congo Red adsorption followed the Freundlich isotherm model, while Methylene Blue followed the Langmuir isotherm model.Keywords: CaO/Fe3O4/SiO2, adsorption, Congo red, Methylene blue
Modification of CaO from Quail Egg Shells with Sodium Dodecyl Sulfate through Extraction and Precipitation Method as Adsorbent for Methylene Blue Dyes Widia Purwaningrum; Yolanda Fany Claudia Manurung; Fatma Fatma; Ady Mara
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 9, No 3 (2024): October 2024
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v9.i3.155

Abstract

Calcium oxide (CaO) is widely used as an adsorbent due to high adsorption effectiveness and can adsorb metals in wastewater and dye waste. The aim of this research is to synthesize CaO from quail egg shells and then modify it using sodium dodecyl sulfate surfactant. Synthesis of CaO was carried out through the extraction method using HCl 1% and precipitation method using Na2CO3 1M. Modified CaO was synthesized by the same method with the addition of Sodium Dodecyl Sulfate (SDS).  Diffractogram peaks on CaO and  CaO modifications are similar to JCPDS data No.88-1811. CaO IR spectrum modification after adsorption showed the addition of functional groups C-N and C=N from methylene blue. CaO and CaO's modifications had pHpzc of 11.82 and 11.62. CaO modification using SDS caused a decrease in the surface area of CaO from 3.9 to 2.5 m2/g and an increase in the pore radius from 3.6 to 13.5 nm. Modification of CaO using SDS decrease the surface area of CaO but adsorption capacity increases 66.19% from 44.63 mg/g to 74.17 mg/g. Kinetic model and adsorption isotherm on CaO and CaO modifications occur in pseudo-second order by following the Langmuir isotherm model. The adsorption process is endothermic and adsorption occurs spontaneously with positive ∆Ho and negative ∆Go values at each adsorption temperature
Co-Authors Addy Rachmat Ady Mara Fatma Fatma Fera Rahma Sari Yolanda Fany Claudia Manurung