Evaluation Low Cost Adsorbent of Walnut Bark Granule for Methylene Blue Dye Removal from Aqueous Environments

Background & Aims of the Study: Methylene blue (MB) is a risk for human and environment.Adsorption process is one of the removal mechanisms of MB. The purpose of this research wasthe evaluation of low cost adsorbent of walnut bark granule for MB dye removal from aqueousenvironments.Materials & Methods: In this experimental research, the effect of various operating parameterssuch as dose of dye (100-500 mg/L), contact time (10-50 min), adsorbent dosage (1-5 g/L) andpH (3-8) was investigated. Color concentration was measured by spectrophotometer (ShimadzuModel UV-120-02) at 663 nm wavelength and pH was analyzed through pH meter (Digimedmodel DM-20, Digicron AnaliticaLtda, Sao Paulo, Brazil).Results: The findings of this research were showed that the walnut bark granule was able toremove up to 41% of MB dye (100 mg/L) from solutions at initial pH 7. Removal efficiency wasincreased by adsorbent dosage and contact time. MB concentration has a reverse effect onremoval. Also, the equilibrium data were also fitted to the Freundlich equilibrium isothermmodel (R2=0.95).Conclusions: Present study showed that use of walnut bark granule, as an absorbent, could beutilized in methylene blue removal. Therefore, considering the production wastes of thiscompound, utilization the essence of this substance as inexpensive absorbent with inexpensiveand available raw material is clear.

کلیدواژه ها:

Adsorbent ، Walnut Bark Granule ، Methylene Blue ، Aqueous environments ، Iran