Cellulose-supported Ni/Al Layered Double Hydroxide (LDH) as Unique Adsorbents for Malachite Green Dye Removal in Aqueous Solutions

Ni/Al-cellulose composites were successfully synthesized using the co-precipitation method. X-Ray Diffraction (XRD), Fourier Transform InfraRed (FT-IR) spectroscopy, Scanning Electron Microscope (SEM), and Brunauer-Emmett-Teller (BET) were used to characterize the structure of materials. Ni/Al-cellulose was applied to the Malachite Green (MG) dye adsorption process to study adsorption and reusability performance. The surface area of Ni/Al material after composting with cellulose increased, from 3.288 to 5.096 m(2)/g. The optimum pH for MG was pH 7 and pH PZC > pH optimum. The equilibrium contact time is 150 minutes. The MG adsorption process in this experiment follows the Langmuir isotherm and pseudo-second-order kinetic models. The adsorption process occurs through physisorption and chemisorption (physicochemical process) based on kinetic data, isotherm data, Delta G value, pH optimum not equal pH PZC, and FT-IR results of adsorbent after MG adsorption. Ni/Al-cellulose has adsorption capacity and percent removal of 107.527 mg/g (71%). Reusability studies show that Ni/Al-cellulose is more effective for reusable in the adsorption process of MG until the sixth cycle, with an adsorption capacity of 54%. Thus, The synthesized NiAl/cellulose composites could potentially be used as an efficient adsorbent for MG adsorption in wastewater.