Synthesis and characterization of magnetic nano cellulose from olive waste (Jeft) for the effective removal of methylene blue from water
Melhem, Abeer Mohammed Rasheed
An-Najah National University
The water pollution is a big problems faced by the countries of the world, without exception. This will lead to different health problems to both human beings and animals. The major problem here is to detect the concentration of one of the pollutants like methylene blue and try to remove it by adsorption. Cellulose used in this study was extracted from Olive Industry Solid Waste (OISW) by a multistep process, the extracted cellulose was then converted to cellulose nanocrystaline (CNC) by acid hydrolysis. Produced CNC was then converted to magnetic cellulose nanocrystalline (MCNC) by treating it with solution of FeCl3.6H2O and FeSO4.7H2O, and that was the first goal of this work. A second objective was removing methylene blue dye from water, using these new prepared materials as an adsorbent for the solid-phase extraction of MB. Produced magnetic CNC was characterized by several spectroscopic and analytical techniques SEM, TEM, XRD, FTIR VSM and TGA. SEM images of the cellulose surface showed rough and porous nature, indicating that the materials present good characteristics to be employed as an adsorbent. The tendency of the prepared MNC for extracting methylene blue (MB) from was water evaluated and compared to the base polymers cellulose and CNC. The base polymer cellulose and CNC showed acceptable tendency for methylene blue. However, CMNC showed excellent extraction efficiency toward MB. Three variable were monitored and evaluated during the extraction process: time, dosage, and concentrations. The adsorption thermodynamics of the three materials cellulose, CNC and CMNC were evaluated, all of them followed Langmuir isotherm model and pseudo –second- order. The negative ∆G° values for the three materials indicate that the adsorption is favorable and spontaneous at these temperatures. The positive value of ∆H° reflects an endothermic adsorption and indicates that the adsorption is favored at high temperature.