Isolation of microcellulose from timoho fiber using the process of delinigfication and maceration: Evaluation of physical, chemical, structural, and thermal properties.

Timoho fiber (TF) is a biodegradable bio-fiber rich in cellulose and a renewable agro textile fiber rich in cellulose polysaccharides. Isolation of micro cellulose from TF is an alternative reinforcement approach in a bio-composite application. This study characterized TF obtained from isolation employing FTIR, XRD, SEM-EDS, and TGA using hydrolysis. Pretreatment was done using alkaline, bleaching, and hydrolysis. FTIR confirmed that the maximum amount of noncellulosic materials had been removed from TF. The XRD result showed that hydrolysis treatment increased the crystal size and crystallinity index of the TF (88.68 %). TGA also revealed that the highest thermal stability had been found in the hydrolyzed TF. The micro cellulose TF represented an interesting source of cellulose reinforcing materials, and it might be continued in the form of nano cellulose.

Corrosion Inhibition of Honeycomb Waste Extracts for 304 Stainless Steel in Sulfuric Acid Solution.

The extract of honeycomb waste was studied as a corrosion inhibitor on 304 stainless steel in H2SO4 solutions. The honeycomb waste was obtained from beekeeping at Lawang-Malang, East Java, Indonesia. Electrochemical and scanning electron microscopy methods were used to investigate the performance of the corrosion inhibition process. The inhibition efficiency of the inhibitor (2000 mg/L) reached 97.29% in 0.5 M H2SO4 and decreased with the acid concentration. Kinetic parameters were calculated to explain the effect of acid concentration on the inhibition process. The study on the adsorption behavior of the extracts followed the Frumkin isotherm model. The adsorption of the inhibitor on the 304 stainless steel surface was confirmed by the negative and lower values of Gibbs free energy. The obtained scanning electron microscopy (SEM) images were confirmed by comparing the surface of the specimens with and without inhibitor after corroding for one week. The results indicated that the extract acted as a good inhibitor for 304 stainless steel in acid corrosion.