Removal of Methylene Blue Dye Using nZVI, Nanoclay and Iron impregnated Nanoclay - A Comparative Study

M.M. Tarekegn, R.M. Balakrishnan, A.M. Hiruy, A.H. Dekebo
Addis Ababa University,
Ethiopia

Keywords: adsorption, clay, composite, Methylene Blue dye, nZVI

Summary:

Extensive use of Methylene Blue (MB) in textile manufacturing industries led to the release of an enormous amount of wastewater containing Methylene Blue into the environment. The adsorption process is one of the conventionally used methods for color removal from textile wastewater with various composites as adsorbents. In this study, nanoclay, nZVI and iron impregnated nanoclay (nanocomposite) were prepared and studied for the removal of Methylene Blue dye in batch mode. The effect of various operating parameters like pH, dye concentration, adsorbents dosage and contact time were investigated and optimized. The pH pzc of nZVI, nanoclay and iron impregnated nanoclay composites were found to be 8.25, 5.8 and 3.4, respectively. The Methylene Blue dye adsorption efficiency was observed to increased inversely with the corresponding pHpzc. The iron-impregnated nanocomposite showed better adsorption efficiency (99.98%) at concentration: 60 ppm, pH:7, dose: 60 mg, temperature: 30 ÂșC and contact time 140 min when compared to other two adsorbents taken for study. Also, it was noticed that the increase in the adsorbent dosage, contact time and pH of operations resulted in an increase in the removal efficiency. In general, the nanocomposite showed promising results for future industrial applications.