Adsorpsi Zn(II) dengan Biosorben Silika dari Limbah Ampas Tebu: Optimasi Menggunakan Response Surface Methodology (RSM)-Central Composite Design (CCD)

Qowiyah, Siti (2024) Adsorpsi Zn(II) dengan Biosorben Silika dari Limbah Ampas Tebu: Optimasi Menggunakan Response Surface Methodology (RSM)-Central Composite Design (CCD). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Seng (Zn) adalah salah satu logam berat dengan batas maksimum dalam perairan yang telah ditetapkan oleh Organisasi Kesehatan Dunia (WHO) sebesar 3 mg/L. Pada penelitian ini, digunakan limbah ampas tebu sebagai sumber potensial untuk membuat silika sebagai biosorben dalam menghilangkan ion seng dari larutan air. Silika disintesis menggunakan metode sol-gel kemudian dikarakterisasi menggunakan XRD, FTIR, XRF, SEM-EDX, dan adsorpsi-desorpsi nitrogen untuk mengetahui sifat fisik dan kimianya. Optimasi adsorpsi Zn(II) dilakukan menggunakan Central Composite Design (CCD) dengan variabel independen yang meliputi dosis adsorben (15; 20; 25 mg), konsentrasi awal larutan Zn(II) (10; 30; 50 mg/L), pH (4; 7; 10), dan waktu kontak (20; 40; 60 menit). Response Surface Methodology (RSM) diterapkan untuk memvisualisasikan korelasi antara variabel independen dan penghilangan ion seng. Hasil XRD menunjukkan adanya puncak amorf pada 2θ sekitar 22,6°. Berdasarkan hasil XRF, kemurnian silika yang disintesis mencapai 79,60%. Spektrum FTIR menunjukkan bahwa silika mengandung ikatan Si-O-Si dan silanol. Analisis SEM-EDX menunjukkan bahwa silika memiliki ukuran partikel yang beragam dan bentuk yang tidak teratur. Analisis BET menunjukkan bahwa silika hasil sintesis memiliki luas permukaan mencapai 97,408 m²/g dan radius ukuran pori 3,70 nm dengan metode metode BJH. Hasil optimasi adsorpsi Zn(II) dicapai dengan waktu kontak 1 menit; dosis adsorben sebanyak 22,67 mg; konsentrasi awal Zn(II) 21,84 mg/L; pH 0 dan 10 dengan persentase removal sebesar 100%. Data kesetimbangan adsorpsi menunjukkan bahwa model isoterm Langmuir paling sesuai dengan data eksperimental yang mengindikasikan bahwa permukaan silika tertutupi oleh lapisan tunggal Zn(II).
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Zinc (Zn) is one of the heavy metals with a maximum limit in water set by the World Health Organization (WHO) at 3 mg/L. In this study, bagasse waste from sugarcane is used as a potential source to synthesize silica for use as a biosorbent to remove zinc ions from aqueous solutions. Silica is synthesized using the sol-gel method and characterized using XRD, FTIR, XRF, SEM-EDX, and nitrogen adsorption-desorption to determine its physical and chemical properties. Optimization of Zn(II) adsorption is conducted using Central Composite Design (CCD) with independent variables including adsorbent dosage (15; 20; 25 mg), initial Zn(II) solution concentration (10; 30; 50 mg/L), pH (4; 7; 10), and contact time (20; 40; 60 minutes). Response Surface Methodology (RSM) is applied to visualize the correlation between independent variables and zinc ion removal. XRD results show an amorphous peak around 2θ of 22,6°. Based on XRF analysis, the purity of synthesized silica reaches 79,60%. FTIR spectra indicate the presence of siloxane and silanol groups in the silica structure. SEM-EDX analysis reveals that silica particles have varied sizes and irregular shapes. BET analysis indicates that the synthesized silica has a surface area of 97,408 m²/g and a pore size radius of 3.70 nm by the BJH method. Optimization of Zn(II) adsorption reveals that the best conditions are achieved with a contact time of 1 minute, adsorbent dosage of 22,67 mg; initial Zn(II) concentration of 21,84 mg/L; and pH conditions ranging from 0 to 10, resulting in 100% removal efficiency. Adsorption equilibrium data suggest that the Langmuir isotherm model best fits the experimental data, indicating that the silica surface is covered by a monolayer of Zn(II).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorption, Optimization, Silica, Sugarcane Bagasse, Zinc Adsorpsi, Ampas Tebu, Seng, Silika, Optimasi
Subjects:	Q Science > QD Chemistry Q Science > QD Chemistry > QD117.S64 Spectrophotometry Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas Q Science > QD Chemistry > QD481 Chemical structure. Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc. Q Science > QD Chemistry > QD75.2 Chemistry, Analytic Q Science > QD Chemistry > QD96F56 Fluorescence spectroscopy
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry
Depositing User:	Siti Qowiyah
Date Deposited:	14 Aug 2024 01:39
Last Modified:	14 Aug 2024 01:39
URI:	http://repository.its.ac.id/id/eprint/113866

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