Abstract
Humin was isolated from the Baturraden resin forest and purified use mixture of HCl:HF. Purified humin is characterised such as identify of functional group of humin, stipulating of water content, stipulating of dust content, obstetrical stipulating of total acidity content, carboxylic and OH phenolic functional group. The adsorption of rodamin by humin measured by UV-Visible spectrophotometer at maximum wavelength of rodamin B liquid, optimum pH and optimum contact time to determine absorbtion capacities and isotherm adsorption pattern .Humin that isolated from Baturraden resin forest have characteristic such as water content 16.6199 %; dust content 9.2050 %; total acidity content 475 cmol / Kg; carboxylic rate 200 cmol/Kg, and OH phenolic rate 275 cmol/Kg. Maximum wavelength of rodamin B is 554 nm and optimum contact time of adsorption rodamin B by humin is 180 minute with optimum pH 4. Adsorption rodamin B by humin follows the pattern of Langmuir isotherm adsorptionwith the value of R2 is 0.9801 and absorption capacities is 39,5257 mg/g.
Highlights
Humin was isolated from the Baturraden resin forest
Purified humin is characterised such as identify of functional group
The adsorption of rodamin by humin measured by UV-Visible spectrophotometer at maximum wavelength
Summary
Humin diisolasi dari tanah hutan damar Baturraden. Sampel tanah dibersihkan dari kerikil dan pengotor dengan cara diayak. Sebanyak 2 g sampel tanah yang telah dibersihkan diekstraksi dengan 100 mL larutan NaOH 0,5 M dengan media botol plastik ukuran 1,5 L kemudian ditambahkan gas nitrogen (N2), ditutup rapat dan dikocok dengan bantuan shaker selama 24 jam. Residu ekstraksi dipisahkan dari larutan dengan sentrifugasi pada kecepatan 2500 rpm selama 15 menit, lalu didekantasi. Humin kotor dicampur dengan (1:1 v/v) 0,2 M HCl dan 0,2 M HF selama 64 jam lalu disaring. Residu yang diperoleh dimasukkan dalam campuran 1:1 HF (5,5) dan HCl (1,1 M) tiga kali selama satu jam, masing-masing didekantasi. Residu dimasukkan dalam larutan 5,5 M HF empat kali masing-masing selama 16 jam. Suspensi yang terbentuk disaring kemudian residu dibilas dengan aquades bebas CO2, filtrat dan air bilasan digabung lalu dititrasi secara potensiometri dengan larutan standar HCl 0,2 N hingga pH 8,4.
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