Adsorptive removal of sulfate, phosphate and chloride by Mg-Al and Zn-Al Layered Double Hydroxides from aqueous solutions

Konferenzbeitrag

Content: The wastewater of leather industry contains pollution loads which includes anionic contaminants such as chloride, sulfate and phosphate. Different treatment technologies for tannery wastewater have been investigated. Adsorption is a promising technique due to its greater selectivity, simple operation, faster regeneration kinetics and high uptake capacity even at trace levels. In the present study, Mg-Al and Zn-Al Layered Double Hydroxides were synthesized by the co-precipitation method at variable pH through a semi-batch system. The prepared material was characterized by XRD, BET surface area determination, TGDTA and FTIR. The chloride, sulfate and phosphate adsorption properties onto Mg-Al and Zn-Al Layered Double Hydroxides from aqueous solutions were evaluated. The adsorption experiments of chloride, sulfate and phosphate were investigated through batch studies at initial concentrations of 100 mg/L of these anions as NaCl, K2SO4 and KH2PO4, respectively. The experiments were carried out separately for each anionic specie by mixing 10 ml of solution with 1 g/L of adsorbent for 5 h. Mixing was performed on a thermostatic shaker at 200 rpm and at room temperature (25 °C). The effect of co-existing anions on the adsorption capacity were also analyzed. After ion adsorption, chloride, sulfate and phosphate concentrations were measured by ion chromatography. The results showed a removal ratio for Mg-Al Layered Double Hydroxide of 24% and 51% for sulfate and phosphate, respectively, while chloride was not removed from the solution. For the adsorbent Zn-Al Layered Double Hydroxide, the removal ratio of sulfate, phosphate and chloride reached 12.76 %, 69.07 % and 6.34%, respectively. Take-Away: Both adsorbents exhibited a satisfactory removal ratio of phosphate. Therefore, Mg–Al and Zn–Al LDHs can be used as effective adsorbents for phosphate removal from industrial wastewaters.

References and Relationships

• Related object and literature: urn:nbn:de:bsz:14-qucosa2-340872 ; qucosa:34087

Classification and Topics

• Subject: Ingenieurwissenschaften

Contributors, Places and Time

• Event: Geistige Schöpfung
• (who): Maia, Marina ; Perez-Lopez, O. ; Gutterres, M.
• Event: Herstellung
• (who): International Union of Leather Technologists and Chemists Societies
• Event: Veröffentlichung
• (who): Verein für Gerberei-Chemie und -Technik e. V. ; Forschungsinstitut für Leder und Kunststoffbahnen (FILK) gGmbH

Further information

• URN: urn:nbn:de:bsz:14-qucosa2-343231
• Last update: 14.03.2025, 8:16 AM CET