Study of Nitrate Adsorption Process on Red Mud; an Emerging Adsorbent Obtained from Industrial Waste

Publish Year: 1393
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

NCCE08_0921

تاریخ نمایه سازی: 5 مهر 1393

Abstract:

Red Mud (RM) is a solid industrial waste remains from Bayer's process to produce of alumina from Bauxite ore. Annually, about 60 million tons of RM is produced all over the world that may cause serious danger for environment (due to its high alkalinity). RM has found many applications in science andindustry e.g. production of color bricks, ceramics, cement, and adsorbents. Application of RM for environmental friendly purposes e. g. removal of heavy metal ions, inorganic anions, organics, dyes and pathogens from aqueous solution, have been widely developed recently. In this paper, process of nitrateadsorption on surface of RM adsorbent is discussed. Laboratory batch experiments conducted to study removal behavior of adsorbent under different pH solution conditions. The results show that increasing or decreasing in pH of solution, may result in reduced nitrate removal capacity. Optimum pH of adsorptionwas in range of natural water (pH=6.5). FT-IR test also implemented to investigate characteristics of RM adsorbent (before and after adsorption process). It shows that adsorption process obeys both physical and chemical procedure. Finally, Ligand-Exchange process on hydroxylated surface is supposed as the main process of nitrate ion adsorption on RM

Authors

Hamidreza Gharibi

Water and Environmental Engineering Faculty, Shahid Beheshti University

Abolghasem Alighardashi

Water and Environmental Engineering Faculty, Shahid Beheshti University

Shahram Raygan

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran

Abbas Akbarzadeh

Water Research Institute, Ministry of Energy

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