KOMPOSIT NANOPARTIKEL CaO/Fe3O4 TERDOPPING SURFAKTAN SDS DAN POLIMER PDA UNTUK ADSORPSI Fe3+ DAN Mn2+ PADA AIR ASAM TAMBANG

PURWANINGRUM, WIDIA and Hariani, Poedji Loekitowati and Hasanudin, Hasanudin and Rachmat, Addy (2024) KOMPOSIT NANOPARTIKEL CaO/Fe3O4 TERDOPPING SURFAKTAN SDS DAN POLIMER PDA UNTUK ADSORPSI Fe3+ DAN Mn2+ PADA AIR ASAM TAMBANG. Doctoral thesis, Sriwijaya University.

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Abstract

The sustainable exploitation of mineral resources necessitates careful consideration of their environmental impact, notably Acid Mine Drainage (AMD). AMD, a byproduct of mining activities, poses a significant threat to water sources, including both groundwater and surface water and poses a risk to the ecological balance, particularly in the vicinity of mining operations. AMD can result in the depletion of biodiversity and aquatic habitats. It exhibits distinctive traits such as low pH levels, salinity, suspended solids, and elevated concentrations of heavy metals, notably iron (Fe) and manganese (Mn) ions. The synthesis of CaO/Fe3O4 begins with the preparation of CaO from green mussel shells (Perna viridis) using the HCl-NaOH, HCl-Na2CO3 extraction method and calcination at 800, 900, and 1000°C. The XRD and BET characterization results show that CaO prepared by the 800°C calcination method has the greatest purity, crystallinity, and surface area. The CaO prepared by the 800°C calcination method was then used as material for the synthesis of CaO/Fe3O4. CaO/Fe3O4/SDS and CaO/Fe3O4/PDA nanoparticle composites were synthesized from CaO/Fe3O4 with the addition of SDS surfactant (Sodium Dodecyl Sulfate) and PDA polymer (Polylidopamine) with a weight ratio of 2:1:0.2. The effect of adding SDS and PDA to CaO/Fe3O4 causes changes in the characteristics of the composite, namely a decrease in surface area and pore volume. Nanoparticle composites CaO/Fe3O4, CaO/Fe3O4/SDS, and CaO/Fe3O4/PDA adsorb Fe3+ and Mn2+. The adsorption process of Fe3+ and Mn2+ by CaO/Fe3O4, CaO/Fe3O4/SDS, CaO/Fe3O4/PDA nanoparticle composites follows the Langmuir isotherm model and pseudo-second order kinetic model. The results showed that the addition of SDS and PDA to CaO/Fe3O4 could increase the adsorption capacity for Fe3+ and Mn2+, namely from 56.18 to 294.118 and 294.118 mg/g for Fe3+ and from 53.192 to 166.667 and 175.439 mg/g for Mn2+. The Fe3+ adsorption process by CaO/Fe3O4, CaO/Fe3O4/SDS, and CaO/Fe3O4/PDA nanoparticle composites was spontaneous and endothermic in the range of 298-328 K. The Mn2+ adsorption process by CaO/Fe3O4, CaO/Fe3O4/SDS, and CaO/Fe3O4/PDA nanoparticle composites was spontaneous at higher temperatures and endothermic in the range of 298-328 K. The application of CaO/Fe3O4, CaO/Fe3O4/SDS, and CaO/Fe3O4/PDA nanoparticle composites to the adsorption of Fe3+ and Mn2+ in acid mine drainage has %removal of Fe3+ was 93%, 100%, 100% and %removal against Mn2+ respectively 97.71%, 99.95% and 98.80%. CaO/Fe3O4, CaO/Fe3O4/SDS, and CaO/Fe3O4/PDA nanoparticle composites can reduce Fe3+ and Mn2+ levels simultaneously in acid mine drainage so that they meet environmental quality standards for coal industry waste. According to the analysis utilizing Response Surface Methodology (RSM) with the Central Composite Design (CCD) model involving three adsorption parameters, namely solution pH, concentration, and contact time, it is evident that solution pH and concentration exert a considerable influence on the removal percentage. The ANOVA results indicate that the quadratic v model is suitable for elucidating the adsorption mechanism of Fe3+ ions employing CaO/Fe3O4/SDS.

Item Type:	Thesis (Doctoral)
Uncontrolled Keywords:	air asam tambang, RSM, CaO/Fe3O4, CaO/Fe3O4/SDS, CaO/Fe3O4/PDA
Subjects:	Q Science > QD Chemistry > QD71-142 Analytical chemistry
Divisions:	08-Faculty of Mathematics and Natural Science > 44001-Mathematics and Natural Science (S3)
Depositing User:	Widia Purwaningrum
Date Deposited:	25 Apr 2024 06:15
Last Modified:	25 Apr 2024 06:15
URI:	http://repository.unsri.ac.id/id/eprint/143125

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