Simultaneous adsorption performance of nitrogen and phosphorus from water by mechano-activated steel slag loaded with MgO

HONG Yingjie; ZHAO Cong; PENG Daoping

doi:10.13205/j.hjgc.202511022

Volume 43 Issue 11

Nov. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(11): 196-204

HONG Yingjie, ZHAO Cong, PENG Daoping. Simultaneous adsorption performance of nitrogen and phosphorus from water by mechano-activated steel slag loaded with MgO[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 196-204. doi: 10.13205/j.hjgc.202511022

Citation:

HONG Yingjie, ZHAO Cong, PENG Daoping. Simultaneous adsorption performance of nitrogen and phosphorus from water by mechano-activated steel slag loaded with MgO[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 196-204. doi: 10.13205/j.hjgc.202511022

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Simultaneous adsorption performance of nitrogen and phosphorus from water by mechano-activated steel slag loaded with MgO

doi: 10.13205/j.hjgc.202511022

Southwest Jiaotong University, Chengdu 611756, China

Received Date: 2025-02-26
Accepted Date: 2025-04-23
Rev Recd Date: 2025-03-29

Available Online: 2026-01-09

Abstract

Abstract

To recover nutrients from wastewater and use steel slag material effectively， this study synthesized a modified steel slag material loaded with magnesium oxide， and probed the factors of adsorbing ammonia nitrogen and phosphate from water solution by this material. This study also analyzed the characterization of magnesium modified steel slag materials before and after adsorption by SEM-EDS， XRD， and RITR， in addition， explored the adsorption mechanism by kinetic model and adsorption isotherm model. The results showed that when the steel slag dosage was equal to 0.1 g/L， initial pH was equal to 3， adsorption time was 360 minutes， phosphate and ammonia nitrogen concentration were 220 mg/L and 100 mg/L， the magnesium-modified steel slag demonstrated a good performance in the simultaneous removal of ammonia nitrogen and phosphate， with maximum removal rates of 79.60% and 97.39% for ammonia nitrogen and phosphate. The maximum adsorption capacity of modified steel slag material was 74.973 mg/g and 216.362 mg/g for ammonia nitrogen and phosphate. Furthermore， it was found that the pseudo-2nd-order kinetic model and the Langmuir temperature adsorption curve model could describe the dynamic process of adsorption well. It indicated that the adsorption processes were chemisorption and molecular layer adsorption， and the final products were mainly struvite， suggesting that magnesium-modified steel slag is expected to become a promising material for nitrogen and phosphorus recovery
- mechano-activated steel slag,
- phosphorus,
- ammonia nitrogen,
- simultaneous recycling,
- struvite

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References(39)

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