Electronic Theses and Dissertation

Metilen biru merupakan zat warna tekstil yang bersifat karsinogenik dan mutagenik yang dapat menyebabkan berbagai permasalahan baik bagi lingkungan maupun makhluk hidup, sehingga perlu dilakukan penanganan terhadap limbah tersebut. Penelitian ini menggambarkan adsorpsi metilen biru menggunakan limbah cangkang melinjo (Gnetum gnemon) teraktivasi basa NaOH. Pembuatan arang aktif cangkang melinjo dilakukan dengan karbonisasi menggunakan furnace pada temperatur 300℃ selama 1 jam dan diaktivasi dengan basa NaOH dengan variasi konsentrasi 1, 2, 3 dan 4 M selama 24 jam. Adapun arang aktif optimum diperoleh pada konsentrasi NaOH 2
M. Arang aktif cangkang melinjo sebelum dan sesudah aktivasi dikarakterisasi menggunakan Fourier Transform Infrared Spectroscopy (FTIR) dan Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX). Penelitian ini dilakukan untuk mengetahui daya serap arang aktif terhadap zat warna metilen biru berdasarkan parameter waktu kontak, pH dan konsentrasi adsorbat. Cangkang melinjo yang teraktivasi dapat mengadsorpsi zat warna metilen biru pada pH 7 dengan waktu kontak optimum 35 menit. Adsorpsi metilen biru mengikuti pola isoterm Langmuir dengan kapasitas serapan maksimum (Qmaks) sebesar 434,78 mg/g. Berdasarkan hasil penelitian, dapat disimpulkan bahwa arang aktif cangkang melinjo yang diaktivasi dengan menggunakan basa NaOH berpotensi digunakan sebagai adsorben zat warna metilen biru.

Kata kunci: arang aktif cangkang melinjo, metilen biru, adsorpsi, NaOH, FTIR, SEM- EDX

Methylene blue is a textile dye which is carcinogenic and mutagenic which can cause various problems for both the environment and living things, so it is necessary to treat this waste. This research describes the adsorption of methylene blue using melinjo (Gnetum gnemon) shell waste activated by NaOH base. The production of activated charcoal from melinjo shells was carried out by carbonization using a furnace at 300℃ for 1 hour and activated with NaOH base with various concentrations of 1, 2, 3 and 4 M for 24 hours. The optimal activated charcoal was obtained at 2 M NaOH concentration. The activated charcoal of melinjo shells before and after activation was characterized using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX). This research was conducted to determine the absorption capacity of activated charcoal on methylene blue dye based on the parameters of contact time, pH and adsorbate concentration. The activated melinjo shell can adsorb methylene blue dye at pH 7 with an optimum contact time of 35 minutes. Adsorption of methylene blue followed the Langmuir isotherm pattern with a maximum absorption capacity (Qmax) of 434,78 mg/g. Based on the research results, it can be interpreted that the activated charcoal of melinjo shell which is activated using NaOH base has the potential to be used as an adsorbent for methylene blue dye. Keywords: melinjo shell activated charcoal, methylene blue, adsorption, NaOH, FTIR, SEM-EDX