التفاصيل البيبلوغرافية
| العنوان: |
Absorbance Enhancement of a Treated Tanzanian kaolin for Removal of Synthetic Dyes from Water. |
| المؤلفون: |
Erasto, Laurance, Hellar-Kihampa, Harieth, Mgani, Quintino Alphonce, Lugwisha, Esther Hellen Jason |
| المصدر: |
Tanzania Journal of Engineering & Technology; 2023, Vol. 42 Issue 4, p11-29, 19p |
| مصطلحات موضوعية: |
KAOLIN, MICROCLINE (Mineral), TEXTILE dyeing, CALCINATION (Heat treatment), TRIDYMITE |
| مستخلص: |
The absorbance efficiency of local kaolin clay from Tanzania (Pugu kaolin) has been enhanced to improve its utilization in removal of textile dyes from water. The clay was acid-activated using H2SO4, after calcination at 750 ℃. Characterization by XRF, XRD, ATR-FTIR and Porosimeter showed kaolinite [Al2Si2O5(OH)4], silica (SiO2) and microcline [KAlSi3O8] as the main phases. Upon acid treatment, silica increased from 44.18% to 58.81% due to the appearance of tridymite, and alumina decreased from 26.70% to 12.74% due to disappearance of the kaolinite. Surface area increased from 15.36 to 149.61 m²/g due to removal of acid-soluble impurities. The chemical composition showed decrease of Fe2O3 and increase of other major oxides. The impact of acid-activation on contact time, temperature, adsorbent dose, initial pH and absorbate concentration was investigated through batch adsorption technique using basic blue 9 (BB9) and direct red 28 (DR28) dyes. The results at optimal conditions of 3 hours contact time, 27oC temperature, 0.9 g adsorbent dose, initial pH of 11 and initial adsorbate concentration of 90 mg/L, showed that acid modification of the clay increased its capacity to adsorb BB9 from 96.82% to 99.91%, and DR28 from 86.33% to 95.04%. These findings established the influence of modifying the raw clay for its dye removal applications. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
