ASAM HUMAT DARI SERBUK TINJA KUDA KERING SEBAGAI ADSORBEN RAMAH LINGKUNGAN UNTUK Cd(II) DAN Zn(II) HUMIC ACID FROM DRY HORSE DUNG POWDER AS GREEN ADSORBENT FOR Cd(II) AND Zn(II)

RAHMAT BASUKI, Sri Juari Santosa

2015 | Disertasi | FMIPA

Extraction of humic acid from dry horse dung powder and horse dung powder soaked in disinfectant was successfully performed. Extraction was performed based on procedure of Stevenson (1994) under atmospheric air. Purification was performed by solution of 0.1 M HCl / 0.3 M HF (1:1). The extraction result are 4 types humic acid from horse dung i.e. crude horse dung humic acid (AHTK), pure horse dung humic acid (AHTK-Mur), crude horse dung humic acid disinfectant (AHTK-Dis), and pure horse dung humic acid disinfectant (AHTK-Dis-Mur). Characterization of fourth of them using UV-Vis and FT-IR analysis show patterns and absorption peaks were similar to the humic acid from peat soil as a comparator which is have characteristics pattern/absorption peak of humic acid based on Stevenson (1994). Based on the best adsorption ability, AHTK-Mur was chosen to study the optimum pH, the isotherms and adsorption kinetics of horse dung humic acids with a metal ion of Cd(II) and Zn(II). Adsorption of Cd(II) and Zn(II) on AHTK-Mur was occurred optimum at pH 5 and contact time to reach equilibrium was 120 minute. Adsorption Cd(II) and Zn(II) follow Langmuir isotherm model and adsorption capacity of Cd(II) was 1.070 × 10-3 mol/g and Zn(II) was 1.329 × 10-3 mol/g. The equation of proposed kinetics model is ?? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ab x t x ab x k x x ab x x e e e a e e ln ln 2 . The adsorption rate of Cd(II) and Zn(II) follow Ho Pseudo-Second Order kinetics model at a concentration of 50 mg/L, but when the concentration of Zn(II) was increased to 400 mg/L (61,112 × 10-4 mol/L), Ho Pseudo-Second Order linearity was decrease, while the Lagergren Pseudo-First Order kinetics and proposed kinetics model was increase. The optimum condition for the proposed kinetics model is the concentration of Zn(II) above 200 mg/L.

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