CD Skripsi

Aplikasi Response Surface Methodology (Rsm) Pada Optimalisasi Kondisi Proses Biosorpsi Logam Cr(Vi) Menggunakan Immobilized Microalgae Beads

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ABSTRACT
Chromium Hexavalent (Cr(VI)) is a type of waste that is carcinogenic and persistent
in the environment. One method that can be used to remove Cr(VI) metal is the
biosorption method, which utilizes microalgae immobilized with sodium alginate to
achieve a stable structure. This study aims to obtain optimum conditions and
empirical models for Cr(VI) removal and optical density using immobilized
microalgae beads with the Response Surface Methodology (RSM) Box Behnken
Design (BBD) technique and characterization of immobilized microalgae beads
based on SEM, FTIR, and mechanical strength. RSM-BBD was chosen because it
can evaluate interactions between process variables and determine optimum
conditions statistically. Three process variables tested, including Cr(VI)
concentration (20-80 mg/L), adsorbent dosage (3-7 g/L), and contact time (2-6
hours), can be optimized statistically to maximize removal efficiency (%) and
optical density. The regression model obtained follows a quadratic model with fairly
good parameter values. The optimum biosorption conditions were obtained at a
Cr(VI) concentration of 59.395 mg/L, an adsorbent dose of 6.571 g/L, and a contact
time of 4.418 hours, resulting in a removal efficiency of 71.070% and an optical
density of 0.4. FTIR analysis revealed the involvement of -OH, -NH2, C=O, C≡C,
and -O- groups in the biosorption process. SEM revealed changes in pores and the
presence of Cr(VI) deposits. Mechanical strength tests showed an increase in
hardness, from 48.01 to 57.60 gForce, and fracturability to 34.56 gForce. These
results indicate the effectiveness and stability of immobilized microalgae beads as
a Cr(VI) biosorbent.
Keywords: Cr(VI), biosorption, RSM, BBD, IMB

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

2107112773

Penerbit

Pekanbaru : Universitas Riau – F.TEKNIK – lingkungan., 2025

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

2107112773

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TEKNIK LINGKUNGAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

daus

Versi lain/terkait

Lampiran Berkas

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