Green synthesis komposit gelatin-hematit menggunakan ekstrak daun jambu biji (Psidium guajava. L) sebagai adsorben limbah laboratorium

Barroroh, Himmatul ORCID: https://orcid.org/0000-0003-2050-0195, Taufiq, Moh. and Royanudin, Moch. (2024) Green synthesis komposit gelatin-hematit menggunakan ekstrak daun jambu biji (Psidium guajava. L) sebagai adsorben limbah laboratorium. Research Report. LP2M UIN Maulana Malik Ibrahim Malang. (Unpublished)

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Abstract

Hematite was successfully synthesized from iron lathe waste using guava leaf extract as a reducing agent. To enhance adsorption capacity, hematite was composited with gelatine, as gelatine is a polymer containing amide and carboxylate functional groups. The hematite-gelatine composite was utilized as an adsorbent for Pb solution. This study aimed to determine the material structure and adsorbent performance, including the optimum concentration, dosage, and contact time. Characterization techniques included XRD, FTIR, and AAS analyses. XRD characterization indicated that the hematite-gelatine composite exhibits a high degree of crystallinity. FTIR analysis of the guava leaf extract spectrum showed the presence of phenolic vibration absorption with strong intensity at a wavenumber of 3447 cm⁻¹ (O-H stretching). C-H vibration bond with weak intensity was observed at 2928 cm⁻¹. The presence of an ester group (C=O) at 1726 cm⁻¹ suggests the presence of tannin compounds, whereas for the hematite-gelatine composite, a C-O absorption appears at 1075 cm⁻¹, along with Fe-O group absorptions at 430 and 519 cm⁻¹. The performance evaluation of the hematite-gelatine composite revealed high adsorption efficiency for Pb and Cu solution. The hematite-gelatine composite can be used as a Pb solution adsorbent with a very high adsorption capacity of 3511 mg/g and Cu solution with capacity of 355 mg/g in concentration variation. The hematite-gelatine composite adsorbent follows the Langmuir isotherm with an R value of 0.91for Pb and 0,95 for Cu. This adsorption follows the Freundlich isotherm with a R 0,99 for Pb and Cu Solution. The optimum dose of adsorption is 15 mg adsorbent for Pb and Cu solution. The optimum contact time of 70 minutes for Pb and 10 minute for Cu. The adsorption kinetics for the hematite-gelatine composite followed a pseudo-first-order adsorption model. The reusability of the composite for adsorbent is effective in 4 cycles adsorption.

Item Type:	Research (Research Report)
Keywords:	adsorption; kinetics; gelatine-hematite composite
Subjects:	03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials 03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030302 Nanochemistry and Supramolecular Chemistry 03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
Divisions:	Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User:	Himmatul Barroroh
Date Deposited:	30 Dec 2024 12:07

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