Construction of Antibacterial, Superwetting, Catalytic, and Porous Lignocellulosic Nanofibril Composites for Wastewater Purification. Issue 34 (9th September 2022)

• Record Type: Journal Article
• Authors: Zhang, Ming; Zhou, Ningyu; Shi, Yanhua; Ma, Yang; An, Congcong; Li, Jian; Jiang, Wei; Wang, Chengyu; Shi, Junyou
• Is Part Of: Advanced materials interfaces. Volume 9:Issue 34(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-09
• Subjects: bacterial removal -- catalytic degradation of dye -- superwetting nanocomposite membrane and aerogel -- water–oil separation -- wood‐based resources; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202201388
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: To simultaneously dispose bacteria, dyes and oils in complex wastewater, the construction of antibacterial, superwetting, catalytic and porous lignocellulosic nanofibril composites are introduced. As‐prepared CPA composites consist of Ag@TiO2 nanoparticles, lignocellulosic nanofibril and polyvinyl alcohol under crosslinking of glutaraldehyde. Specifically, a superwetting CPA membrane with oil contact angle (OCA) of 159° ± 2° is prepared by vacuum filtrating and freeze‐drying methods, while a superwetting CPA aerogel (OCA: 156° ± 2°) is directly obtained via freeze‐drying the nanocomposite suspension. Such CPA membrane has a higher oil‐water separation efficiency (98.95%), and CPA aerogel displays a better dye degradation capacity (98.8%) under sunlight. Notably, the aerogel can withstand 2299 times of its own weight without deformation in air, but squash 22% of its own height and return to its original state underwater. Modified CPA aerogel gains an opposite superwetting property with water contact angle (WCA) of 147° ± 2° and a stronger oil adsorption capacity (37.6 g g ‐1 ) than modified CPA membrane (WCA: 151° ± 2°). Besides, CPA composites shows remarkable durability (toward acid, alkali, brine solution, and friction test) and excellent antibacterial properties (against S. aureus, B. subtilis, E. coli ). Predictably, this strategy may significantly simplify and accelerate the purification of complex wastewater, and offer more options for different application scenarios. Abstract : Antibacterial, superwetting, catalytic, and porous lignocellulosic nanofibril composites capable of killing bacteria, separating oil from water, and removing emitted organic dyes are achieved in this study. Such four types of superwetting CNF/PVA/Ag@TiO2 membranes and aerogels can deal with multiple pollutants simultaneously, offering a promising solution to adapt and simplify the purification procedure of the complex industrial wastewater.