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POTENSI PENGGUNAAN HIDROTALSIT DALAM REMEDIASI AIR ASAM TAMBANG DI LAHAN GAMBUT

POTENSI PENGGUNAAN HIDROTALSIT DALAM REMEDIASI AIR ASAM TAMBANG DI LAHAN GAMBUT. Oleh Sri Juari Santosa Jurusan Kimia FMIPA UGM. Introduction. ACID MINE. Acidity: Oxidation of pyrite. 2. Dissolution of humic and fulvic acids. Introduction.

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POTENSI PENGGUNAAN HIDROTALSIT DALAM REMEDIASI AIR ASAM TAMBANG DI LAHAN GAMBUT

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  1. POTENSI PENGGUNAAN HIDROTALSIT DALAM REMEDIASI AIR ASAM TAMBANG DI LAHAN GAMBUT Oleh Sri Juari Santosa Jurusan Kimia FMIPA UGM

  2. Introduction ACID MINE • Acidity: • Oxidation of pyrite 2. Dissolution of humic and fulvic acids

  3. Introduction Humic Substances are traditionally fractionated according to their solubilities • Fulvic acids: are those organic materials that are • soluble in water at all pH values • Humic acids: are those materials that are • insoluble at acidic pH values • (pH < 2) but are soluble at • higher pH values • Humin: is the fraction that is insoluble in • water at all pH values

  4. Introduction

  5. Introduction Negative Effect of Acid Mine Attach and erode soil and minerals to result the dissolution of metals, like Fe, Cd, Mn, and Zn Environmental pollution

  6. Purpose Utilization of Hydrotalcite to remediate acid mine Study on the ability of Mg/Al hydrotalcite in neutralize the acidity through exchanging its interlayer hydroxide (OH-), carbonate (CO32-), and bicarbonate (HCO3-) anions with polluting anions of SO42-, humic acid (HA), and fulvic acid (FA) in aqueous solution

  7. Notes Hydrotalcite (layered double hydroxide anionic clay) 1) General formula: [M2+1-xM3+x(OH)2]x+(An-)x/n . yH2O where: M2+ is divalent cation M3+ is trivalent cation An- is interlayer anion (1-x/x) varies from 1 to 5 2) Structure:

  8. Notes

  9. Notes

  10. Notes

  11. Notes

  12. Experimental 50 mL mixed solution of Mg2+ and Al 3+ pH NaOH 0,5 M Synthesis of Mg/Al hydrotalcite 13.00

  13. Experimental oC pH Synthesis of Mg/Al hydrotalcite (continued) 120 7.00 XRD IR

  14. Experimental pH 50 mL Aquadest 0.1 g Mg/Al hydrotalcite Shaker bath, 2 hours Stability Test 3; 5; 7; 9; 11; 13

  15. Experimental oC mg Stability Test (countinued) 120 198

  16. Experimental Peat Soil or Humus Purification Purified Peat Soil or Humus Shaking in NaOH Solvent extraction with MIBK Humic Substances Humic Acid & Humin Humin Fulvic Acid (Insoluble fraction) (Soluble fraction) (MIBK phase) (Aqueous phase) Back extraction into NaOH Fulvic Acid Humic Acid Humin Ad. HCl (Soluble) (Aqueous phase) (MIBK phase) Solvent extraction with MIBK Humic Acid Humic Acid (Precipitation) (MIBK phase) Purification Washing & Evap. MIBK Purified Humic Acid Pure Humic Acid (Solid) Alkaline Extraction Solvent Extraction Isolation of Humic and Fulvic Acids

  17. Experimental pH Shaker bath, 2 hours 50 mL Humic acid 150 mg/L 0.1 g Mg/Alhydrotalcite Effect of Medium Acidity on the Adsorption 3; 5; 7; 9; 11; 13

  18. Experimental UV-Vis 400 nm separation filtrate Effect of Medium Acidity on the Adsorption (continued) Aads Vs pH

  19. Experimental minute 0.1 g Mg/Alhydrotalcite 50 mL Humic acid 150 mg/L Shaker bath Rate of Adsorption 9.00 10, 20, 40, 60, 180, 300 +

  20. Experimental UV-Vis 400 nm filtrate Rate of Adsorption (continued) Aads Vs t

  21. Experimental ppm minute 50 mL Humic acid 0.1 g Mg/Alhydrotalcite Shaker bath Adsorption Capacity 120, 150, 180, 210, 240 t optimum +

  22. Experimental UV-Vis 400 nm filtrate Adsorption Capacity (continued) Aads Vs A0 Ceq/m Vs Ceq

  23. Experimental minute 0.01 g humic acid + Mg/Alhydrotalcite 25 mL NaOH 0.5 M separation Shaker bath Desorption 5, 15, 30, 60, 120 +

  24. Experimental UV-Vis 400 nm filtrate Desorption (continued) % Elution Vs t

  25. Results and Discussion

  26. Characterization of Functional Group of Humic Acid Table Distribution of oxygen containing functional groups (meq/100 g) in humic acids isolated from widely different climatic zones

  27. 100 80 60 40 20 Stability of Hydrotalcite Stability of Mg/Al hydotalcite (%) 0 3 6 9 12 14 pH

  28. Effect of Medium Acidity on the Adsorption of Anions on Mg/Al Hydrotalcite

  29. The Change of Medium Acidity after the Adsorption of Anions

  30. Interpretation of the Adsorption Process

  31. Effect of Interaction Time on the Adsorption of Anions

  32. Adsorption Capacity of Mg/Al Hydrotalcite for Humic Acid

  33. Regeneration of Mg/Al Hydrotalcite from Humic Acid

  34. Conclusions Mg/Al hydrotalcite is a very potential adsorbent for the remediation of acid mine since: • Easy to be synthesized • Highly stable at wide range of medium acidity • Highly adsorb anions occurring in acid mine • Increasing the pH of medium to close to neutral • Easy to be regenerated • Implication: • Dissolution of metals from soil and minerals in acid mine may be minimized • The desorption product may be used to ameliorant

  35. Sekian Terima Kasih

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