SINTESIS KOMPOSIT ASAM HUMAT/KITIN/MAGNETIT DAN APLIKASINYA SEBAGAI ADSORBEN ZAT WARNA MALACHITE GREEN

SYLVIA INTAN WIBOWO, Prof. Dr. Bambang Rusdiarso, DEA; Prof. Dr.rer.nat. Nuryono, M.S.

2024 | Skripsi | KIMIA

Telah dilakukan sintesis komposit Asam Humat/Kitin/Magnetit dan aplikasinya sebagai adsorben zat warna malachite green. Asam humat diekstraksi dari tanah gambut menggunakan metode International Humic Substances Society (IHHS). Sintesis adsorben komposit Asam Humat/Kitin/Magnetit dilakukan dengan metode kopresipitasi dan memanfaatkan NH4OH sebagai agen pengendap hingga pH mencapai 11. Material dikarakterisasi menggunakan Fourier Transform Infra-Red Spectroscopy (FTIR), X-Ray Diffraction (XRD), dan Vibrating Sample Magnetometer (VSM). Kajian adsorpsi zat warna malachite green meliputi variasi pH, kinetika adsorpsi, dan isoterm adsorpsi. Konsentrasi zat warna malachite green dianalisis menggunaan spektrofotometer UV-Vis.

Hasil karakterisasi menunjukkan bahwa komposit Asam Humat/Kitin/Magnetit telah berhasil disintesis. Adsorpsi zat warna  malachite green menggunakan komposit optimum pada pH 7 dan mengikuti kinetika orde kedua semu model Ho-McKay dengan konstanta laju adsorpsi sebesar 19 g mg-1 menit-1. Isoterm adsorpsi zat warna malachite green mengikuti model Langmuir dan didapatkan nilai KL sebesar 173,4 L mg-1. 

The synthesis of Humic Acid/Citin/Magnetite composite and its application as adsorbent for malachite green dye was carried out. Humic acid was extracted from peat soil using the International Humic Substances Society (IHHS) method. The synthesis of Humic Acid/Citin/Magnetite composite adsorbent was carried out by coprecipitation method and utilized NH4OH as precipitating agent until the pH reached 11. The material was characterized using Fourier Transform Infra-Red Spectroscopy (FTIR), X-Ray Diffraction (XRD), and Vibrating Sample Magnetometer (VSM). Adsorption studies of malachite green dye included pH variation, adsorption kinetics, and adsorption isotherms. The concentration of malachite green dye was analyzed using a UV-Vis spectrophotometer.

The characterization results showed that the Humic Acid/Citin/Magnetite composite had been successfully synthesized. Adsorption of malachite green dye using the composite was optimum at pH 7 and followed the Ho-McKay model pseudo second-order kinetics with an adsorption rate constant of 19 g mg-1 min-1. The adsorption isotherm of malachite green dye followed the Langmuir model and obtained a KL value of 173.4 L mg-1. 

Kata Kunci : adsorpsi, komposit AH/Kitin/Magnetit, malachite green, adsorption, humic acid/chitin/magnetite composites, malachite green