Abstract
The efficacy of Shorea dasyphylla sawdust as an adsorbent for the removal of humic acid from aqueous solution was investigated as a function of pH value, agitation period, agitation rate, initial humic acid concentration and adsorbent dosage. The equilibrium nature of humic acid adsorption was described by the Langmuir, Freundlich and BET isotherms. The experimental adsorption data was best fitted to the Langmuir adsorption model, which gave adsorption capacity of 68.4 mg humic acid adsorbed per gram Shorea dasyphylla sawdust at pH 2.0 and initial humic acid concentration of 80 mg L-1. Kinetic studies indicated that the sorption process followed the pseudo-second-order kinetic model. It was revealed that after three cycles of adsorption and desorption, Shorea dasyphylla sawdust retained its promising adsorption ability. With an initial amount of 73.5 mg humic acid adsorbed per gram sawdust, more than 80% of humic acid desorbed by using 0.1 M HCl. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were employed to study the mechanism of the removal of humic acid. From the dimensionless factor, RL data, it was determined that the adsorption of humic acid onto untreated Shorea dasyphylla sawdust was favourable.
Zusammenfassung
Untersucht wurde die Wirksamkeit von Shorea dasyphylla Sägemehl als Adsorbens zur Entfernung von Huminsäure aus wässriger Lösung in Abhängigkeit vom pH-Wert, der Rührdauer, der Rührgeschwindigkeit, der Anfangskonzentration der Huminsäure und der Adsorbensdosierung. Der Gleichgewichtszustand von Huminsäure-Adsorption wurde mittels den Langmuir-, Freundlich- und BET-Isothermen beschrieben. Die Versuchsdaten konnten am besten durch das Langmuir-Modell beschrieben werden. Es ergab sich eine Adsorptionskapazität von 68.4 mg adsorbierter Huminsäure pro Gramm Shorea dasyphylla Sägemehl bei einem pH-Wert von 2.0 und einer Huminsäure-Anfangskonzentration von 80 mg/L. Kinetische Untersuchungen ergaben, dass der Sorptionsprozess dem kinetischen Modell pseudo-zweiter Ordnung folgte. Es zeigte sich, dass Shorea dasyphylla Sägemehl nach drei Adsorptions-Sorptions-Zyklen seine potentiell gute Adsorptionsfähigkeit bewahrt hatte. Die adsorbierte Menge von 73.5 mg Huminsäure pro Gramm Sägemehl, wurde zu über 80% mittels 0.1 M HCl desorbiert. Mittels Fourier-Transformations-Infrarot-Spektroskopie (FTIR) und Rasterelektronenmikroskopie (REM) wurde der Mechanismus der Entfernung von Huminsäure untersucht. Mit dem dimensionslosen Faktor RL wurde die erfolgreiche Adsorption von Huminsäure an unbehandeltes Shorea dasyphylla Sägemehl nachgewiesen.
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Kamari, A., Wan Ngah, W.S. & Wong, L.W. Shorea dasyphylla sawdust for humic acid sorption . Eur. J. Wood Prod. 67, 417–426 (2009). https://doi.org/10.1007/s00107-009-0336-y
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DOI: https://doi.org/10.1007/s00107-009-0336-y