يوسف گلابكش

Cellulose nanocrystals (CNCs) are hydrophilic nanoparticles with unique properties such as high strength, biodegradability and biocompatibility which makes them valuable for applications in fields like materials science, biomedicine, electronics, and environmental engineering. In this study, CNCs were synthesized via acid hydrolysis and incorporated into polyvinylidene fluoride (PVDF) membranes to assess their impact on membrane performance in vacuum membrane distillation process. Membranes containing 0.0625, 0.125, 0.3125, and 0.625 weight percent of CNCs were combined with 1.6 grams of PVDF polymer in a 10-gram casting solution. Their performance was eva‎luated for desalination of salt water with a concentration of 15,000 ppm at an operational temperature of 65°C for half an hour. A surface modification using stearic acid was also applied to the CNCs, and membranes with 0.125, 0.3125, and 0.625 weight percent of these modified nanoparticles were synthesized. The performance of these membranes was studied under similar operational conditions. The synthesis method and characterization of the synthesized nanoparticles were validated using AFM, XRD, and FTIR analyses. Additionally, FESEM, AFM, contact angle, porosimetry and wettability Analyzes were conducted on the membranes to examine their structure and surface. In this study, membranes containing 0.3125 weight percent CNCs and modified CNCs exhibited the best desalination performance, with permeate fluxes of 47.35 and 55.19 liters per square meter per hour, respectively. They represented a 444% and 534% increase in permeability compared to neat membrane. Notably, nearly all membranes studied demonstrated salt rejection above 99%.

تقطير غشايي خلأ , نانوكريستال‌هاي سلولزي , غشاي پلي‌وينيليدن‌فلورايد , اصلاح سطحي نانوكريستال‌هاي سلولزي

Vacuum membrane distillation , cellulose nanocrystals , polyvinylidene fluoride membrane , surface modification of cellulose nanocrystals

Yousef Golabkesh

Toraj Mohammadi