Electronic Theses and Dissertation

Ganggang merah merupakan rumput laut yang memiliki potensi dan manfaatnya dalam berbagai aplikasi industri seperti industri pangan, farmasi, kosmetik, kimia dan dekontaminasi air melalui proses adsorpsi. Penelitian ini bertujuan mempelajari studi kinetika dan model isoterm adsorpsi logam Pb menggunakan biosorben ganggang merah dari laut Sabang. Ganggang merah yang diambil dari laut Sabang dilakukan identifikasi dan diproses menjadi biosorben. Karakterisasi biosorben dilakukan menggunakan Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) dan Scanning Electron Microscopy (SEM) dan dilakukan uji adsorpsi terhadap logam Pb dengan memvariasikan pH, waktu kontak, massa biosorben dan konsentrasi awal adsorbat dan ditentukan model kinetika adsorpsi serta model isoterm adsorpsinya. Hasil identifikasi menunjukkan bahwa ganggang merah laut Sabang termasuk ganggang merah spesies Halymenia durvillei. Hasil karakterisasi FTIR, XRD dan SEM terhadap biosorben ganggang merah laut Sabang masing-masing menunjukkan adanya gugus OH dan C=O, memiliki struktur semi-kristalin dan memiliki morfologi berpori. Hasil uji adsorpsi menunjukkan bahwa kondisi optimum adsorpsi logam Pb terjadi pada pH 6, waktu kontak 30 menit, massa biosorben 2,5 gram dan konsentrasi awal adsorbat 25 mg/L dengan efisiensi penyerapan sebesar 98,36%. Model kinetika adsorpsi terhadap logam Pb mengikuti pseudo second order (PSO) dengan nilai R2 yaitu 0,9999 dan model isoterm adsorpsi logam Pb mengikuti isoterm Freundlich dengan nilai R2 secara 0,9132.

Red algae is seaweed which has potential and benefits in various industrial applications such as the food, pharmaceutical, cosmetic, chemical and water decontamination industries through the adsorption process. This research aims to study the kinetics and isotherm model of Pb metal adsorption using red algae biosorbent from the Sabang Sea. Red algae taken from the Sabang sea is identified and processed into biosorbent. Biosorbent characterization was carried out using Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) and an adsorption test was carried out on Pb metal by varying pH, contact time, biosorbent mass and initial adsorbate concentration and the adsorption kinetics model and the adsorption isotherm model were determined. The identification results show that the Sabang sea red algae species is Halymenia durvillei. The results of FTIR, XRD and SEM characterization of the Sabang sea red algae biosorbent respectively shows the presence of OH and C=O groups, has a semi-crystalline structure and has a porous morphology. The adsorption test results showed that the optimum conditions for Pb metal adsorption occurred at pH 6, contact time 30 minutes, biosorbent mass 2,5 grams and initial adsorbate concentration 25 mg/L with an absorption efficiency of 98.36%. The adsorption kinetics model for Pb metal follows pseudo second order (PSO) with an R2 value of 0,9999 and the Pb metal adsorption isotherm model follows the Freundlich isotherm with an R2 value of 0,9132.