Fabrication an‎d investigation of properties of two-dimensional materials of double layered hydroxides (LDH) using mechanochemical method

9/22/2026 12:00:00 AM

Layered double hydroxides are a class of two-dimensional nanomaterials that have attracted significant attention over the past two decades due to their unique structural features an‎d diverse physicochemical properties. These materials have found applications in adsorption, catalysis, energy storage (supercapacitors an‎d batteries), an‎d drug delivery systems. In this study, cobalt–aluminum LDH was constructed using a mechanochemical approach. This method is considered a green, cost-effective, an‎d scalable alternative to conventional solution-based techniques, making it suitable for industrial production. The construction process was carried out using both laboratory-grade an‎d industrial-grade precursors to enable comparative analysis of structural an‎d functional performance. Subsequently, the mechanochemical construction method was optimized, an‎d the effects of oven treatment an‎d aging steps on the formation of LDH layers an‎d their influence on the dye removal process were investigated. The constructed materials were characterized using XRD, FT-IR, BET, SEM, EDS, an‎d XRF analyses; Then, the ban‎d gap of the synthesized samples was measured using UV-DRS analysis. Additionally, zeta potential measurements were performed to determine the surface charge behavior of the synthesized LDHs. Structural stability of the cobalt–aluminum LDH under ambient conditions was confirmed over a two-week period using XRD an‎d FT-IR, indicating high environmental resistance. The adsorption an‎d degradation performance of the LDHs were eva‎luated using Congo red (100 ppm) an‎d methylene blue (100 ppm an‎d 10 ppm) as model dyes. Experiments were conducted with 0.1 g of Co-Al LDH in 100 mL of dye solution. Under optimal conditions (pH = 5), the laboratory-grade sample achieved 80% adsorption of Congo red within 45 minutes in the dark, while the industrial-grade sample demonstrated 81% degradation after 1 hour of light exposure. In contrast, methylene blue exhibited weaker interaction with the LDH material, with a maximum degradation efficiency below 12%, attributed to its cationic nature an‎d lower affinity for interlayer interactions within the LDH structure.

نانو مواد دو بعدي - هيدروكسيد لايه‌اي دوگانه - مكانوشيميايي - جذب سطحي - قرمز كنگو - آبي متيلن

Two-dimensional nanomaterials - layered double hydroxide - mechanochemical - surface adsorption - Congo red - methylene blue

Fateme fazli

Dr. Rezvane Amrollahi