Recent advances in heavy metal removal by thin film nanocomposite membrane

Abstract

Rapid industrialization has become one of the root causes of environmental problems, particularly heavy metal pollution. Numerous methods, including chemical precipitation and ion exchange, have been used to remove heavy metal ions from aqueous solutions, but all of them have drawbacks, such as low metal removal effectiveness, significant reagent loss, excessive energy use, and the need for further development of the current techniques. Membrane-based technologies such as reverse osmosis (RO) and nanofiltration (NF) are gaining popularity in the removal of heavy metals due to their high rejection and low formation of secondary pollutants. Among the methods under consideration, the membrane-based approach holds the most promise for wastewater treatment with a focus on heavy metal ion removal due to its ease of manufacture, superior qualities, and increased separation effectiveness. Since membrane performance is typically hampered by fouling, low permeability, and significant contaminant permeation when compared to strict selectivity criteria, the development of novel membrane materials has emerged as an important area of research for academia, industry, and national laboratories. We have therefore reviewed previous initiatives and technological developments in order to achieve more effective heavy metal removal and recovery from industrial wastewater. HIGHLIGHTS Wastewater treatment technologies and existing methods in heavy metal removal are reviewed.; Five types of membranes are discussed on their strengths and weakness.; Table of summary from previous research that used TFN membrane in heavy metal removal is included.; Crucial challenges associated with TFN membrane production are discussed.; Strategies to overcome the limitation of TFN are discussed in detail.;

Keywords

• heavy metal
• membrane technology
• thin film nanocomposite