Influencing Factors of the In Situ Formed Iron Hydroxide (FeO_xH_y) on the Removal of Phosphate by Coagulation and Adsorption

Abstract:

This study prepared the in situ formed iron hydroxide (in situ FeO_xH_y) by the interactions between Fe³⁺ and OH^- at different molar ratios of 1:0, 1:1, 1:2 and 1:3. The influences of molar ratios and pH on the removal of phosphate were investigated and the surface of in situ FeO_xH_y before and after adsorption was analyzed. The phosphate removal rate with mass unit iron hydroxide is greater at the molar ratios of 1:3 between Fe³⁺ and OH^-. The phosphate removal rate is maximum at the pH 6~7. The compatibility of iron hydroxide towards raw water pH value is better when the proportion of hydroxyl ion is greater. The disposal effect is good at the pH 4~9. The iron hydroxide formed at different molar ratios is not definitive shape and it can remove phosphate by the chemical action of adsorption and sedimentation.

• Periodical: Advanced Materials Research (Volumes 864-867)
• Pages: 1772-1778
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.864-867.1772
• Online since: December 2013
• Authors: Li Hua Sun*, Tian Min Yu, Xue Ru Chen, Xiao Lu Qi, Ya Jun Zhang
• Keywords: Adsorption, Coagulation, In Situ FeO_xH_y, Influencing Factor, Phosphate

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