Synthesis and characterization of crystalline carboxymethylated lignin–TEOS nanocomposites for metal adsorption and antibacterial activity

Kumari, Shweta; Jha, Harit

doi:10.1186/s40643-016-0107-7

Cited by 18 publications

(5 citation statements)

References 47 publications

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“…This decrease may be due to the fact that as sorbent dose increases, sorption sites aggregate and overlap, thereby reducing total accessible surface area. This results in reduction of the quantity of sorbate adsorbed by a unit mass of sorbent, which leads to reduction of sorption capacity (Shweta and Jha 2016). Similar behaviour was reported by Nwadiogbu et al (2016) who found the crude oil sorption capacity of raw and acetylated corn cob to decrease from 4000mg/g to 1000mg/g and 2300mg/g to 500mg/g, respectively on increasing the sorbent dosage from 0.5g to 2g.…”

Section: Raobsp Aaobspsupporting

confidence: 79%

Acetylated African Oil Bean Seed Pod For Crude Oil Spill Mop

Ifeyinwa

Ajiwe

2022

Preprint

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Oil spill remediation has continued to be a challenge in the world today. Thus efforts are still been made to develop more efficient oil spill mop up techniques. Natural adsorption with agricultural wastes, which otherwise constitute environmental pollution, has become an attractive technique for oil spill mop. Acetylation using acetic anhydride with iodine catalyst was carried out to improve the hydrophobicity of African oil bean seed pod (AOBSP), which is a lignocellulosic material and as such is naturally hydrophilic. Characterization of the raw and acetylated AOBSP were done using SEM, BET and FTIR analyses. Batch crude oil sorption tests were performed using both the raw and acetylated AOBSP. Isotherm, kinetic and thermodynamic studies were also carried out. FTIR analysis showed evidence of successful acetylation of AOBSP and adsorption of crude oil onto the raw and acetylated AOBSP. SEM and BET analyses showed improvement of the surface properties of AOBSP by the acetylation process. The BET surface area increased from 226.4 m2/g for the raw AOBSP to 310.0 m2/g for the acetylated AOBSP. Oil sorption was found to be by monolayer coverage, with monolayer sorption capacity of 5000mg/g and 12500mg/g for raw and acetylated AOBSP, respectively. The rate-controlling mechanism for the sorption processes was chemisorption. Negative values of ΔGo, ΔHo and ΔSo were obtained, showing that the sorption processes were feasible, spontaneous and exothermic, with a degree of orderliness at the solid–mixture interface. The results obtained from this study show that both raw and acetylated AOBSP are efficient oil sorbents with potentials for further improvement for oil spill mop.

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Section: Raobsp Aaobspsupporting

confidence: 79%

Acetylated African Oil Bean Seed Pod For Crude Oil Spill Mop

Ifeyinwa

Ajiwe

2022

Preprint

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“…TEOS is a silane compound which forms bonds with hydroxyl groups found in both lignin and the polymer matrix. This chemical bonding creates a strong network that improves thermal stability, chemical resistance, and dimensional stability of the material (Shweta and Jha, 2015;Shweta and Jha, 2016;Liu et al, 2022). Additionally, the silica-rich nature of TEOS cross-linking enhances the material's fire resistance, making it a promising choice for applications where safety is a top priority.…”

Section: Resultsmentioning

confidence: 99%

Cross-linking lignin and cellulose with polymers using siloxane compounds

Grade,

Zhang,

Yang

et al. 2024

Front. Mater.

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Siloxanes are a group of substances characterized by Si-O-Si functional group. Siloxanes can react with alcohols to form Si-O-C bond. Siloxanes have been widely used as crossing linking agents and graft copolymers as well as additives for plastics. Lignin contains both phenolic and aliphatic hydroxy groups which have the potential to instigate bonding with siloxane compounds. However, there has not been any attempt to apply siloxanes as crosslinking agents for biobased composite formation. This manuscript presents the first study of applying siloxanes compounds to lignin and Cellulose nanofibers (CNF) with respective PLA, PETG, and HDPE to prepare biocomposites. Both Tetramethyl Tetraphenyl Trisiloxane (TTT) and Tetraethoxysilane (TEOS) were used as cross-linking agents. We have successfully incorporated 20 wt% lignin and 10 wt% CNF into the biocomposite filaments. The tensile properties of ensuing biocomposite were investigated. The objective of this work is to demonstrate the potential of lignin and CNF as a sustainable co-polymer to improve the properties of PLA/PETG/HDPE-based materials for 3D printing. This paper will also discuss the challenges and opportunities associated with the use of lignin in 3D printing, including the effect of lignin and CNF content on the mechanical and thermal properties, the compatibility of lignin and CNF with PLA/PETG/HDPE, and the potential for further optimization of the cross-linking chemistry using TTT and TEOS.

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“…The carboxymethylation reaction has been carried out by mixing lignin with NaOH followed by sodium chloroacetate or monochloroacetic acid in the time and temperature range of 1-6 h and 30-90°C, respectively. 40,[115][116][117][118][119] Alternative pathways were considered for purifying the products, such as acidification, 118 membrane dialysis, 40 and washing with ethanol. 116,119,120 Carboxymethylated lignin has been proposed as an effective dispersant for oil-water emulsions, 109 crude bitumen emulsions, 121 and clay, 40 cement, 116 and graphite suspensions.…”

Section: Carboxyalkylationmentioning

confidence: 99%

“…In addition, due to its potential in adsorbing heavy metals, such as nickel and cadmium, this product has been suggested to be used in wastewater treatment and biofilters. 119 Carboxymethylated lignosulfonate was also reported to improve the heat capacity of leather when it was used along with tanning chromium in leather production. 115 Carboxyethylation.…”

Section: Carboxyalkylationmentioning

confidence: 99%

Grafting strategies for hydroxy groups of lignin for producing materials

2019

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Lignin is one of the most abundant biopolymers on Earth and is considered as the primary resource of aromatic compounds. Recently, lignin has attracted attention from scientists and industrialists due to its inherent potential arising from its unique structure, which leads to its possible use in many applications.Many efforts have been made to ameliorate the reactivity and compatibility of lignin in different areas. Although methods have been proposed for endowing lignin with different properties, there continues to be a considerable demand for discovering new and effective ways of unraveling the beneficial uses of this aromatic polymer. Considering the structure of lignin, different grafting modifications can occur on the aliphatic and/or aromatic groups of lignin. To date, there has been a lack of fundamental understanding of the modification pathways of lignin for generating lignin-based products. In this review paper, we discuss comprehensively the chemical reactions that were introduced in the literature for preparing lignin with different features via modifying its phenolic and aliphatic hydroxy groups for altered uses. This review paper critically and comprehensively elaborates on the recent progress in lignin reactions as well as the challenges, advantages and disadvantages associated with the reaction procedures and the product development processes. Furthermore, the research gap in reaction strategies and product development are described throughout this study.

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Synthesis and characterization of crystalline carboxymethylated lignin–TEOS nanocomposites for metal adsorption and antibacterial activity

Cited by 18 publications

References 47 publications

Acetylated African Oil Bean Seed Pod For Crude Oil Spill Mop

Acetylated African Oil Bean Seed Pod For Crude Oil Spill Mop

Cross-linking lignin and cellulose with polymers using siloxane compounds

Grafting strategies for hydroxy groups of lignin for producing materials

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