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.
镁离子与腐殖酸对纳滤去除布洛芬的影响
- Title:
- Effects of Magnesium Ion and Humic Acid on Nanofiltration for Removal of Ibuprofen
- Keywords:
- nanofiltration membrane; ibuprofen; magnesium ion; humic acid; impact mechanism
- 摘要:
- 为探究复合污染物对聚酰胺纳滤膜去除布洛芬（IBU）的影响，研究了Mg2+、腐殖酸（HA）及二者共存对IBU截留率、膜比通量及膜吸附量的影响，并结合膜表面Zeta电位与扫描电镜（SEM）表征，探索其影响机制。结果表明，当Mg2+单独存在且浓度逐渐增加时，IBU截留率显著降低，膜比通量小幅下降，主要归因于静电排斥作用减弱。而当HA单独存在时，IBU截留率在筛分与静电排斥的协同作用下显著提高，在HA浓度为10 mg/L时可达到83.7%，但HA污染层导致了膜比通量的下降。在Mg2+与HA共存条件下，膜比通量大幅衰减，IBU截留率随Mg2+浓度的增加而呈波动性下降趋势，当Mg2+浓度为1 mmol/L时，因静电斥力减弱而导致IBU截留率明显降低；当Mg2+浓度增至2 mmol/L时，因筛分作用增强而使得IBU截留率略有升高；当Mg2+浓度继续升至8 mmol/L时，因膜表面污染严重，IBU反向扩散受阻，IBU截留率降至最低，由此可知，Mg2+是影响共存体系中IBU去除的关键因素，但其主要作用机制随其浓度变化而有所不同。
- 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+.
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