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Papers by MARIAM TEMITOPE AROWONA

Research paper thumbnail of Catalytic crosslinking of a regenerated hydrophobic benzylated cellulose and nano TiO2 composite for enhanced oil absorbency

e-Polymers, 2017

Hydrophobic cellulosic composites with the nano form of metal oxides possess good absorptive and ... more Hydrophobic cellulosic composites with the nano form of metal oxides possess good absorptive and adsorptive potentials. Native cellulose was regenerated, benzylated, crosslinked and blended with TiO2 nanoparticles to absorb toluene, xylene, chloroform, kerosene and petrol. The composite was fully characterized by scanning electron microscopy (SEM), transmission emission microscopy (TEM), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The effect of crosslinker, catalyst and time of absorption was investigated. The FTIR shows stretch and bend vibrations of hydroxyl (-OH), alkyl (-CH), aromatic double bond (C=C) for benzyl cellulose while the appearance of new peaks at 816, 769 and 726 cm−1 for Ti-O stretching vibrations confirms the successful synthesis of the composite. The SEM images revealed the transformation of foam-like appearance of benzyl cellulose to a solidified mass after TiO2 compositing. Enhanced oil absorption was seen as the amount of the aluminum sulfat...

Research paper thumbnail of Characterization of Synthesized Cellulose Derivatives in 1-Butyl-3-Methylimidazolium Chloride Ionic Liquid

Research Square (Research Square), Aug 17, 2022

To obtain pure holocellulose, cellulosic wastes were chemically pretreated. Depending on the deri... more To obtain pure holocellulose, cellulosic wastes were chemically pretreated. Depending on the derivatizing agents used, the dissolution and functionalization of various holocelluloses obtained in 1-butyl-3methylimidazolium chloride [BIMIM]Cl ionic liquid using different derivatizing agents such as cellulose acetate, cellulose phthalates, and cellulose ether. Cold acetone and dichloromethane were used to regenerate the dissolved product in ionic liquids, and the resulting ionic liquids were reused.The degree of substitution (DS) of the products obtained ranged from 1.00 to 2.77 at 100°C. FTIR analysis revealed important absorption bands which include: (C = O at ~ 1750 cm − 1 , SP 3-CO at ~ 1250cm − 1 , SP 2-CO at 1100cm − 1 , for esters of cellulose acetate and phthalate, Aromatic-CH stretching at 1577cm − 1 for cellulose phthalate and-CO-CH 2 CH 3 at 1720cm − 1 with the absence of SP 2 bending frequency at 1250cm − 1 which con rms the successful synthesis of ethyl cellulose). XRD showed values at (2θ= 14.5°, 17.0°, 22.7° and 34.5°) for all samples. Comparison of SEM images of the cellulose and derivatives showed little or no destruction of the bre strands while EDS revealed C and O as (Elemental composition of all samples. Thermogravimetric analysis (TGA/DTA) showed the derivatives possessed higher thermal stability that the starting materials thus, producing materials with better application. All these revealed a successful extraction and puri cation of cellulose from wastes as well as the synthesis of cellulose derivatives.

Research paper thumbnail of Thermally Stable Rice Husk Microcrystalline Cellulose as Adsorbent in PTLC Plates

Journal of the Turkish Chemical Society, Section A: Chemistry, 2018

Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretrea... more Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretreatment, delignification, bleaching, and hydrolytic operations. MCC was also prepared from cotton wool and used as a reference because of its high cellulose content to estimate a relative yield and quality of the MCC produced from rice husk. The characteristic morphological feature was established by scanning electron micrograph (SEM) and the crystallinity of the Rice husk Microcystalline cellulose was further confirmed using the X-RD technique; the functional group was confirmed by the Fourier transform infrared (FTIR) spectroscopic method with characteristic absorption bands of ;-OH stretching at 3416 cm-1 ; C-H stretching at 2918 cm-1 ;-OH bending at1377 cm-1 ;, 1159 cm-1 ; and CO -C pyranose ring skeletal vibrations at 1026-1033 cm-1 , and the thermal stability was determined from thermogravimetric analysis (TGA). The characterized MCC of rice husk was applied as a stationary phase in Preparative Thin Layer Chromatography gave good separation (PTLC).

Research paper thumbnail of Thermally Stable Rice Husk Microcrystalline Cellulose as Adsorbent in PTLC Plates

Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretrea... more Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretreatment, delignification, bleaching, and hydrolytic operations. MCC was also prepared from cotton wool and used as a reference because of its high cellulose content to estimate a relative yield and quality of the MCC produced from rice husk. The characteristic morphological feature was established by scanning electron micrograph (SEM) and the crystallinity of the Rice husk Microcystalline cellulose was further confirmed using the X-RD technique; the functional group was confirmed by the Fourier transform infrared (FTIR) spectroscopic method with characteristic absorption bands of ;-OH stretching at 3416 cm-1 ; C-H stretching at 2918 cm-1 ;-OH bending at1377 cm-1 ;, 1159 cm-1 ; and CO -C pyranose ring skeletal vibrations at 1026-1033 cm-1 , and the thermal stability was determined from thermogravimetric analysis (TGA). The characterized MCC of rice husk was applied as a stationary phase in Preparative Thin Layer Chromatography gave good separation (PTLC).

Research paper thumbnail of Catalytic crosslinking of a regenerated hydrophobic benzylated cellulose and nano TiO2 composite for enhanced oil absorbency

e-Polymers, 2017

Hydrophobic cellulosic composites with the nano form of metal oxides possess good absorptive and ... more Hydrophobic cellulosic composites with the nano form of metal oxides possess good absorptive and adsorptive potentials. Native cellulose was regenerated, benzylated, crosslinked and blended with TiO2 nanoparticles to absorb toluene, xylene, chloroform, kerosene and petrol. The composite was fully characterized by scanning electron microscopy (SEM), transmission emission microscopy (TEM), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The effect of crosslinker, catalyst and time of absorption was investigated. The FTIR shows stretch and bend vibrations of hydroxyl (-OH), alkyl (-CH), aromatic double bond (C=C) for benzyl cellulose while the appearance of new peaks at 816, 769 and 726 cm−1 for Ti-O stretching vibrations confirms the successful synthesis of the composite. The SEM images revealed the transformation of foam-like appearance of benzyl cellulose to a solidified mass after TiO2 compositing. Enhanced oil absorption was seen as the amount of the aluminum sulfat...

Research paper thumbnail of Characterization of Synthesized Cellulose Derivatives in 1-Butyl-3-Methylimidazolium Chloride Ionic Liquid

Research Square (Research Square), Aug 17, 2022

To obtain pure holocellulose, cellulosic wastes were chemically pretreated. Depending on the deri... more To obtain pure holocellulose, cellulosic wastes were chemically pretreated. Depending on the derivatizing agents used, the dissolution and functionalization of various holocelluloses obtained in 1-butyl-3methylimidazolium chloride [BIMIM]Cl ionic liquid using different derivatizing agents such as cellulose acetate, cellulose phthalates, and cellulose ether. Cold acetone and dichloromethane were used to regenerate the dissolved product in ionic liquids, and the resulting ionic liquids were reused.The degree of substitution (DS) of the products obtained ranged from 1.00 to 2.77 at 100°C. FTIR analysis revealed important absorption bands which include: (C = O at ~ 1750 cm − 1 , SP 3-CO at ~ 1250cm − 1 , SP 2-CO at 1100cm − 1 , for esters of cellulose acetate and phthalate, Aromatic-CH stretching at 1577cm − 1 for cellulose phthalate and-CO-CH 2 CH 3 at 1720cm − 1 with the absence of SP 2 bending frequency at 1250cm − 1 which con rms the successful synthesis of ethyl cellulose). XRD showed values at (2θ= 14.5°, 17.0°, 22.7° and 34.5°) for all samples. Comparison of SEM images of the cellulose and derivatives showed little or no destruction of the bre strands while EDS revealed C and O as (Elemental composition of all samples. Thermogravimetric analysis (TGA/DTA) showed the derivatives possessed higher thermal stability that the starting materials thus, producing materials with better application. All these revealed a successful extraction and puri cation of cellulose from wastes as well as the synthesis of cellulose derivatives.

Research paper thumbnail of Thermally Stable Rice Husk Microcrystalline Cellulose as Adsorbent in PTLC Plates

Journal of the Turkish Chemical Society, Section A: Chemistry, 2018

Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretrea... more Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretreatment, delignification, bleaching, and hydrolytic operations. MCC was also prepared from cotton wool and used as a reference because of its high cellulose content to estimate a relative yield and quality of the MCC produced from rice husk. The characteristic morphological feature was established by scanning electron micrograph (SEM) and the crystallinity of the Rice husk Microcystalline cellulose was further confirmed using the X-RD technique; the functional group was confirmed by the Fourier transform infrared (FTIR) spectroscopic method with characteristic absorption bands of ;-OH stretching at 3416 cm-1 ; C-H stretching at 2918 cm-1 ;-OH bending at1377 cm-1 ;, 1159 cm-1 ; and CO -C pyranose ring skeletal vibrations at 1026-1033 cm-1 , and the thermal stability was determined from thermogravimetric analysis (TGA). The characterized MCC of rice husk was applied as a stationary phase in Preparative Thin Layer Chromatography gave good separation (PTLC).

Research paper thumbnail of Thermally Stable Rice Husk Microcrystalline Cellulose as Adsorbent in PTLC Plates

Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretrea... more Microcrystalline cellulose (MCC) was prepared from rice husk by subjecting it to alkaline pretreatment, delignification, bleaching, and hydrolytic operations. MCC was also prepared from cotton wool and used as a reference because of its high cellulose content to estimate a relative yield and quality of the MCC produced from rice husk. The characteristic morphological feature was established by scanning electron micrograph (SEM) and the crystallinity of the Rice husk Microcystalline cellulose was further confirmed using the X-RD technique; the functional group was confirmed by the Fourier transform infrared (FTIR) spectroscopic method with characteristic absorption bands of ;-OH stretching at 3416 cm-1 ; C-H stretching at 2918 cm-1 ;-OH bending at1377 cm-1 ;, 1159 cm-1 ; and CO -C pyranose ring skeletal vibrations at 1026-1033 cm-1 , and the thermal stability was determined from thermogravimetric analysis (TGA). The characterized MCC of rice husk was applied as a stationary phase in Preparative Thin Layer Chromatography gave good separation (PTLC).