Removal of ciprofloxacin via enhancing hydrophilicity of membranes using biochar
Muhammad Zaheer Afzal, Said Akbar Khan, Chao Song, Muhammad Irfan, Shuguang Wang
Abstract
Growing concerns regarding the presence of pharmaceuticals in wastewater necessitate their removal. Membrane filtration offers a promising approach. This study explores the development of biochar incorporated mixed matrix membranes (MMMs) for ciprofloxacin removal from water. Biochar, derived from the pyrolysis of agricultural waste, was blended with polyether sulfone (PES) and polyvinylpyrrolidone in varying ratios. The resulting MMMs exhibited progressively improved properties with increasing biochar content. Notably, membrane M 11 , comprising equal parts PES and biochar, displayed the highest porosity, lowest surface roughness (12.0), and lowest contact angle (31.05°), indicating enhanced hydrophilicity (increased by 58.19% compared to the biochar-free membrane). M 11 effectively removed ciprofloxacin along with three additional antibiotics from different classes. Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses corroborated the removal of ciprofloxacin. Furthermore, M 11 demonstrated excellent regenerability, retaining over 57% removal efficiency after four cycles. These findings highlight the potential of M 11 as a sustainable and cost-effective membrane for pharmaceutical removal from wastewater.