Electrifying CQDs-doped PANI-embedded membrane for enhanced self-cleaning targeting wastewater treatment

IF 2.4 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2025-07-10 DOI:10.1002/jctb.70017

Ravi Ravi, Ayush Singh, Animes Kumar Golder

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Abstract

BACKGROUND

Electrically conductive membranes have recently emerged as a promising solution, offering self-cleaning properties with reduced fouling. In this study, we synthesized electrically conductive polyaniline (PANI) and carbon quantum dots-doped PANI (CQDs/PANI) using Piper longum plant extracts and incorporated them into polysulfone/polyvinylpyrrolidone (PSF/PVP) membranes for improved self-cleanliness by minimizing membrane fouling.

RESULTS

Optimized PANI and CQDs₄₀/PANI (with 40% CQDs) achieved notable electrical conductance of 513.4 ± 24.1 and 997.3 ± 29.7 μS, respectively. The incorporation of 2% PANI and CQDs₄₀/PANI into the membranes (denoted as PANI₂-PVP₂/PSF_12.5 and CQDs₄₀/PANI₂-PVP₂/PSF_12.5) enhanced membrane conductivity to 4.23 × 10⁻³ and 5.30 × 10⁻³ S cm⁻¹, respectively. The CQDs₄₀/PANI modification improved hydrophilicity and porosity (16.0 ± 1.2% to 66.1 ± 2.7%). The water flux of PVP₂/PSF_12.5, PANI₂-PVP₂/PSF_12.5 and CQDs₄₀/PANI₂-PVP₂/PSF_12.5 membranes was measured as 316.0 ± 9.3, 435.4 ± 11.9 and 485.7 ± 14.4 L m⁻² h⁻¹, respectively. Filtration of E. coli in phosphate buffer demonstrated significant fouling mitigation, with a reduced fouling from 69.1% to 49.3% and 34.5% for PANI- and CQDs₄₀/PANI-modified membranes, respectively, and flux recovery improved correspondingly, from 46.4% to 74.4% and 83.7% along with improved E. coli rejection from 63.7 ± 3.3% to 83.1 ± 2.9% and 96.5 ± 1.5%, respectively. E. coli-spiked sewage water filtration showed superior E. coli rejection (98.3 ± 2.3%) and fouling recovery (86.3 ± 2.1%) with lower fluxes than that of E. coli. Hagen–Poiseuille and resistance-in-series models showed <15% variations in theoretical and experimental fluxes.

CONCLUSION

The study achieved notable enhancement in the electrical conductivity, hydrophilicity and flux with the incorporation of CQDs/PANI. The developed membranes exhibit strong potential for mitigating fouling through an electrified self-cleaning mechanism, enhancing the efficiency of wastewater treatment. © 2025 Society of Chemical Industry (SCI).

Abstract Image

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电气化cqds掺杂聚苯胺包埋膜增强自清洁靶向废水处理

导电性膜最近成为一种很有前途的解决方案，它具有自清洁特性，同时减少了污染。在这项研究中，我们利用长叶胡椒植物提取物合成了导电聚苯胺（PANI）和碳量子点掺杂聚苯胺（CQDs/PANI），并将它们掺入聚砜/聚乙烯吡咯烷酮（PSF/PVP）膜中，通过减少膜污染来提高自洁性。结果优化后的PANI和CQDs40/PANI的电导率分别为513.4±24.1 μS和997.3±29.7 μS。在膜中掺入2% PANI和CQDs40/PANI（记为PANI2-PVP2/PSF12.5和CQDs40/PANI2-PVP2/PSF12.5），膜电导率分别提高到4.23 × 10−3和5.30 × 10−3 S cm−1。CQDs40/PANI改性提高了亲水性和孔隙率（16.0±1.2%至66.1±2.7%）。PVP2/PSF12.5、PANI2-PVP2/PSF12.5和CQDs40/PANI2-PVP2/PSF12.5膜的水通量分别为316.0±9.3、435.4±11.9和485.7±14.4 L m−2 h−1。磷酸缓冲液中大肠杆菌的过滤效果显著，PANI-和CQDs40/PANI改性膜的污染分别从69.1%降低到49.3%和34.5%，通量回收率相应提高，从46.4%提高到74.4%和83.7%，大肠杆菌的排异率分别从63.7±3.3%提高到83.1±2.9%和96.5±1.5%。与大肠杆菌相比，大肠杆菌对污水的截留率（98.3±2.3%）和污染回收率（86.3±2.1%）明显高于大肠杆菌。Hagen-Poiseuille模型和电阻串联模型显示理论和实验通量有15%的变化。结论CQDs/PANI的掺入可显著提高其电导率、亲水性和通量。所开发的膜通过电气化自清洁机制显示出减轻污染的强大潜力，提高了废水处理的效率。©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.