Studi Adsorpsi Dedak Padi terhadap Zat Warna Congo Red di Kabupaten Wajo

Abstract

ABSTRAK
Penelitian ini adalah penelitian eksperimen dengan tujuan sebagai studi adsorpsi zat warna congo red yang selanjutnya diaplikasikan ke limbah pencelupan menggunakan dedak padi. Sampel diperoleh dari Kecamatan Tanasitolo, Kabupaten Wajo, Sulawesi Selatan. Studi adsorpsi dilakukan dengan beberapa optimasi yaitu, pH dan waktu kontak. Adsorpsi terbesar pada pH 6 dengan persentase sebesar 94,13 % dan waktu kontak 30 menit dengan persentase adsorpsi sebesar 91,99%. Aplikasi dedak padi terhadap limbah yaitu mampu menyerap 3249,41 ppm dengan persentase sebesar 34,30 %. Kapasitasi adsorpsi isoterm mengikuti adsorpsi Freudlich dengan kapasitas 7,19 mg/g. Adapun hasil uji karakterisasi dedak padi diperoleh kadar air sebesar 5,88%. Hasil analisis FT-IR diperoleh serapan gugus fungsi pada bilangan gelombang (cm-1) yakni:3408,22 (-OH), 2924.00 (CH3), 2852.72 (-CH2) dan 1074,35 (Si-O). Hasil topologi dedak padi menggunakan Scanning Electron Microscopy (SEM) sebelum adsorpsi diperoleh permukaan berpori besar sedangkan setelah adsorpsi terlihat zat warna terperangkap pada pori-pori dedak padi. Uji unsur menggunakan Energy Dispersive Spectroscopy (EDS) sebelum dan setelah adsorpsi mengalami perubahan persentase.
Kata kunci: Dedak Padi, Adsorpsi, zat warna congo red

ABSTRACT
This research was an experimental research that aimed as adsorption study of rice bran against congo red dye and then applicated on silk yarn dyeing waste. Sample was obtained from Tanasitolo District, Wajo, South Sulawesi. Adsorption study was conducted with several optimization, i.e, pH and contact time. Greatest adsorption at pH 6 with the percentage of 94,13% and contact time of 30 minutes with the percentage of 91,99%. Rice bran had the ability to adsorb the waste in the concentration of 3249,41 ppm with the percentage of 34,30%. The adsorption followed the Freundlich isotherm with the maximum adsorption capacity of 7,19 mg/g. From the characterization result obtained the water content value of 5,88%. Analysis using FT-IR obtained the adsorption of functional groups in wavelength (cm-1) i.e.:3408,22 (-OH), 2924.00 (CH3), 2852.72 (-CH2) and 1074,35 (Si-O). Topology test using Scanning Electron Microscopy (SEM) adsorption obtained the process surface of large after adsorption showed that dye attached at pores of rice bran. The elements test using Energy Dispersive Spectroscopy (EDS) before and after adsorption showed changes of the percentage the elements.
Keywords: Rice Bran, Adsorption, Congo Red Dye