Phosphate removal from aqueous solutions using slag derived from hydrogen plasma reduction of red mud

Analele Universităţii "Ovidius" Constanţa. Seria Chimie/"Ovidius" University Annals of Chemistry, vol. 37, pp. 24–29

Abstract

Abstract In this study, the possibility of using slag derived from hydrogen-plasma reduction of red mud (H 2 RMS) as a low-cost adsorbent for phosphate removal from aqueous solutions was investigated. Batch adsorption experiments were conducted to evaluate the effects of contact time, solution pH, sorbent dosage, and initial phosphate concentration under controlled laboratory conditions. Phosphate concentrations were determined spectrophotometrically using the ammonium molybdate method. These results demonstrated that phosphate adsorption onto H 2 RMS is strongly pH-dependent, with maximum removal efficiency achieved under acidic conditions (pH ≈ 2). Adsorption equilibrium was achieved after approximately 18 h of contact time. Increasing the sorbent dosage enhanced phosphate removal efficiency, although improvements became marginal beyond a dosage of 10 g/L. At optimal conditions, phosphate removal efficiency of approximately 90% was achieved. These findings indicate that H 2 RMS shows significant potential as an effective adsorbent for phosphate removal, offering a possible pathway for the valorization of metallurgical waste residues.

Authors 8

1. Duško Kostić

   University of East Sarajevo

   Affiliation as printed

   Faculty of Technology , University of East Sarajevo , Karakaj 34 A , Zvornik , Republic of Srpska , Bosnia and Herzegovina

2. Jelena Vuković

   University of East Sarajevo

   Affiliation as printed

   Faculty of Technology , University of East Sarajevo , Karakaj 34 A , Zvornik , Republic of Srpska , Bosnia and Herzegovina

3. Nebojša Vasiljević

   University of East Sarajevo

   Affiliation as printed

   Faculty of Technology , University of East Sarajevo , Karakaj 34 A , Zvornik , Republic of Srpska , Bosnia and Herzegovina

4. Mitar Perušić

   University of East Sarajevo

   Affiliation as printed

   Faculty of Technology , University of East Sarajevo , Karakaj 34 A , Zvornik , Republic of Srpska , Bosnia and Herzegovina

5. Srećko Stopić Aachen IME Process Metallurgy and Metal Recycling

   RWTH Aachen University

   Affiliation as printed

   IME Process Metallurgy and Metal Recycling , RWTH Aachen University , Intzestrasse 3 , Aachen , Germany

6. Maria Teresa Bellver Baca
   Affiliation as printed

   Sika Services AG, Tüffenwies 16 , Zürich , Switzerland

7. Slavko Smiljanić

   University of East Sarajevo

   Affiliation as printed

   Faculty of Technology , University of East Sarajevo , Karakaj 34 A , Zvornik , Republic of Srpska , Bosnia and Herzegovina

8. Radislav Filipović

   University of East Sarajevo

   Affiliation as printed

   Faculty of Technology , University of East Sarajevo , Karakaj 34 A , Zvornik , Republic of Srpska , Bosnia and Herzegovina

   Nova Alumina d.o.o. , Karakaj , Zvornik, Republic of Srpska , Bosnia and Herzegovina