LüYong-tao,YANGYa-xin,HELong,et al.Effects of Magnesium Ion and Humic Acid on Nanofiltration for Removal of Ibuprofen[J].China Water & Wastewater,2024,40(3):73-78.
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Effects of Magnesium Ion and Humic Acid on Nanofiltration for Removal of Ibuprofen

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第3期 Page: 73-78 Column: Date of publication: 2024-02-01
Author(s):
Lü　Yong-tao1; 2;  YANG　Ya-xin1; 2;  HE　Long1; 2;  CAO　Jie-yu1;  XU　Xin-qi1;  WANG　Lei1; 2
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Key Laboratory of Membrane Separation of Shaanxi Province， Research Institute of Membrane Separation Technology of Shaanxi Province， Xi’an 710055， China）
Keywords:
nanofiltration membrane;  ibuprofen;  magnesium ion;  humic acid;  impact mechanism
Abstract:
This paper investigated the effects of magnesium ion (Mg2+), humic acid (HA) and their coexistence on ibuprofen (IBU) retention, membrane flux and membrane adsorption capacity, and revealed the mechanism combined with the characteristics of membrane surface Zeta potential and scanning electron microscopy (SEM), so as to explore the effect of complex pollutants on polyamide nanofiltration membrane for the removal of IBU. When Mg2+ was present alone and its concentration gradually increased, the retention rate of IBU decreased significantly and the membrane specific flux decreased slightly, mainly due to the weakening of electrostatic repulsion. When there was only HA, the retention rate of IBU increased significantly under the synergistic effect of screening and electrostatic repulsion, and reached 83.7% when HA concentration was 10 mg/L. However, the HA layer also led to the decrease in membrane specific flux. Under the coexistence of Mg2+ and HA, the membrane specific flux decreased significantly, and the IBU retention rate showed a downward trend in volatility with the increase of Mg2+ concentration. When the Mg2+ concentration was 1 mmol/L, the IBU retention rate significantly decreased due to the weakening of electrostatic repulsion force. When the Mg2+ concentration increased to 2 mmol/L, the retention rate of IBU increased due to the enhanced screening effect. When the Mg2+ concentration further increased to 8 mmol/L, the reverse diffusion of IBU was inhibited due to serious membrane surface fouling, and the IBU retention rate was reduced to the minimum. The results indicated that Mg2+ was a key factor affecting the removal of IBU in the co?existing system, and its main impact mechanism varied with the concentration of Mg2+.
Last Update: 2024-02-01