Reactive layered hydroxide membrane for advanced water treatment: Micropollutant degradation and antifouling potential

Afia Sharmin; Muhammad Bilal Asif; Guomin Zhang; Muhammed A Bhuiyan; Biplob Kumar Pramanik

doi:10.1016/j.chemosphere.2024.142318

Reactive layered hydroxide membrane for advanced water treatment: Micropollutant degradation and antifouling potential

Chemosphere. 2024 May 10:359:142318. doi: 10.1016/j.chemosphere.2024.142318. Online ahead of print.

Authors

Afia Sharmin¹, Muhammad Bilal Asif², Guomin Zhang¹, Muhammed A Bhuiyan¹, Biplob Kumar Pramanik³

Affiliations

¹ School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia.
² Advanced Membranes and Porous Materials Center (AMPMC), Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.
³ School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia. Electronic address: biplob.pramanik@rmit.edu.au.

PMID: 38735495
DOI: 10.1016/j.chemosphere.2024.142318

Abstract

The effective removal of micropollutants by water treatment technologies remains a significant challenge. Herein, we develop a CoFe layered double hydroxide (CoFeLDH) catalytic membrane for peroxymonosulfate (PMS) activation to achieve efficient micropollutant removal with improved mass transfer rate and reaction kinetics. This study found that the CoFeLDH membrane/PMS system achieved an impressive above 98% degradation of the probe chemical ranitidine at 0.1 mM of PMS including five more micropollutants (Sulfamethoxazole, Ciprofloxacin, Carbamazepine, Acetaminophen and Bisphenol A) at satisfactory level (above 80%). Moreover, significant improvements in water flux and antifouling properties were observed, marking the membrane as a specific advancement in the removal of membrane fouling in water purification technology. The membrane demonstrated consistent degradation efficiency for several micropollutants and across a range of pH (4-9) as well as different anionic environments, thereby showing it suitability for scale-up application. The key role of reactive species such as SO₄^•-, and O₂^• - radicals in the degradation process was elucidated. This is followed by the confirmation of the occurrence of redox cycling between Co and Fe, and the presence of CoOH⁺ that promotes PMS activation. Over the ten cycles, the membrane could be operated with a flux recovery of up to 99.8% and maintained efficient performance over 24 h continuous operation. Finally, the efficiency in degrading micropollutants, coupled with reduced metal leaching, makes the CoFeLDH membrane as a promising technology for application in water treatment.

Keywords: Antifouling; Catalytic membrane; Layered double hydroxides (LDH); Micropollutants; Peroxymonosulfate(PMS).