Removal of lead ions from aqueous solutions via polyelectrolyte enhanced ultrafiltration and nanofiltration: efficacy evaluation of chitosan, polyethylenimine, and polyacrylic acid

IF 2.4 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2025-07-23 DOI:10.1002/jctb.70016

Molka Nafti-Mateur, Celine Pochat-Bohatier, Karima Horchani-Naifer, Mouna Jaouadi, Dorra Jellouli Ennigrou

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Abstract

BACKGROUND

Lead contamination in wastewater is a significant environmental issue, necessitating effective removal methods. This study evaluates the performance of polyelectrolyte-enhanced ultrafiltration (PEUF) and nanofiltration (NF) processes for removing lead ions from aqueous solutions. The objective was to assess the effectiveness of various polyelectrolytes (chitosan, polyethylenimine, and polyacrylic acid) in conjunction with ultrafiltration and to investigate the influence of experimental parameters on lead retention and permeate flux.

RESULTS

In the PEUF process, a polyethersulfone membrane with a pore size of 10 kDa (PES10) was used. The maximum lead ion rejection of 97% was achieved with polyacrylic acid (PAA) at a concentration of 600 ppm and a transmembrane pressure of 4 bar. Increasing the feed pH enhanced lead retention but reduced permeate flux. Higher ionic strength negatively affected both lead retention and permeate flux. Over time, permeate flux decreased from 553 to 221 L/h/m² due to solute accumulation and polymer aggregation. For the NF process, the maximum lead retention of 68% occurred at a transmembrane pressure of 6 bar. Lead retention increased at lower pH (73% at pH 2) but decreased at higher pH (47% at pH 5). The addition of salt adversely affected lead removal.

CONCLUSION

Both PEUF and NF methods effectively removed lead ions from wastewater, with PEUF showing higher removal efficiency. These findings demonstrate the potential of these filtration processes for heavy metals remediation in water treatment applications. © 2025 Society of Chemical Industry (SCI).

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聚电解质强化超滤和纳滤去除水溶液中的铅离子：壳聚糖、聚乙烯亚胺和聚丙烯酸的效果评价

废水中的铅污染是一个重要的环境问题，需要有效的去除方法。本研究评估了聚电解质增强超滤（PEUF）和纳滤（NF）工艺去除水溶液中铅离子的性能。目的是评估各种聚电解质（壳聚糖、聚乙烯亚胺和聚丙烯酸）与超滤结合的有效性，并研究实验参数对铅潴留和渗透通量的影响。结果PEUF工艺采用孔径为10 kDa （PES10）的聚醚砜膜。当聚丙烯酸（PAA）浓度为600 ppm，跨膜压力为4 bar时，铅离子截留率最高可达97%。提高进料pH值可提高铅潴留率，但降低渗透通量。较高的离子强度对铅潴留和渗透通量均有负面影响。随着时间的推移，由于溶质积累和聚合物聚集，渗透通量从553 L/h/m2下降到221 L/h/m2。在NF过程中，跨膜压力为6 bar时，铅的最大保留率为68%。铅潴留在较低的pH值下增加（pH 2时为73%），但在较高的pH值下减少（pH 5时为47%）。盐的加入对铅的去除有不利影响。结论PEUF法和NF法均能有效去除废水中的铅离子，PEUF法的去除率更高。这些发现证明了这些过滤工艺在水处理应用中重金属修复的潜力。©2025化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.