The organic-agricultural waste resulted from local farmer or community gardening recently paid public attention. The presence and easily grow of "Lidah Mertua" or Sanseviera trifasciata being focus investigation for its prospecting application. It was reported that the leaves contain some phenolic compound including tannin from aqueous extraction. This paper revealed recent investigation application of isolated tannin from leave part for modification of carbon. The previous paper published that carbon was able to adsorb some toxic heavy metals. However, it has some limitation including lower capacity adsorption. Impregnation of tannin-isolated from S. trifasciata leaves was proposed able to improve the carbon functionality, physical appearance, pores size, and its adsorption capacity. Our investigation discloses that modified carbon with tannin was able to adsorb iron(II) between 14-18% of its weight. It activity improved to 20% adsorption for 30 min shaking. The working pH adsorption ranges between 3 and 8, and the optimum adsorption is reached after pH 6 (above 60% adsorption occurred). The Langmuir and Freundlich adsorption mechanism model also disclosed that mechanism of iron(II) adsorption on the adsorbent tannin-immobilized on carbon. The real test using community well drilling water source also gave an important finding on the concentration of iron(II) contained on water source even sample is taken from the single side.
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