Thermogravimetric Analysis and Chemical Kinetics for Regeneration of Sodium and Potassium Carbonate Solid Sorbents

Chaiwang, Pilaiwan; Chalermsinsuwan, Benjapon; Piumsomboon, Pornpote

doi:10.1080/00986445.2015.1078796

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…It directly measures the mass of a sample, as it is heated, cooled, or held at a definite temperature in a defined atmosphere. Thus, TGA has been used to study materials like polycarbonates, microalgae, tar sands, coal, different biomass residues, − and biomass/coal blends , among others.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Kinetic Studies on Biomass Degradation via Thermogravimetric Analysis: A Combination of Model-Fitting and Model-Free Approach

2021

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Thermal degradation behavior and kinetics of two agricultural (soy and oat hulls) and two forestry biomass (willow and spruce) residues were investigated using a unique combination of model-fitting and model-free methods. Experiments were carried out in an inert atmosphere at different heating rates. Both single step and multistep models were explored in deriving activation energies, frequency factors, and mechanisms of all four biomass residues. For the single step models, activation energy values ranged from 107.2 kJ/mol for willow and 139.7 kJ/mol for soy hull, and the frequency factors for both materials were 1.1 × 10 9 and 2.66 × 10 12 s –1 , respectively. The multistep models gave further insight into the different mechanisms across the full degradation spectrum. There was an observed difference between the number of distinct steps/mechanisms for the agriculture-based versus wood-based biomass materials, with pyrolysis occurring in three distinct steps for the agricultural biomass residues while the woody residues degraded in two steps. The difference in the number of distinct steps can be attributed to the composition and distribution of components of the biomass, which would differ based on the nature and source of the biomass.

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Section: Introductionmentioning

confidence: 99%

Thermal and Kinetic Studies on Biomass Degradation via Thermogravimetric Analysis: A Combination of Model-Fitting and Model-Free Approach

2021

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“…In the field of tissue regeneration, suitable contact angles between 40 and 70 provides optimal conditions for cell adhesion. 41 The con- to 250 C. 42 The loss of water molecules bonded by strong hydrogen bonds occurred at 400 C. After 400 C to 900 C, weight loss of ($15%) is due to degradation of glycosidic bonds of CHI and small hydrocarbon residues. 35,43 The PS component of the hydrogel also Therefore, slight change among weight loss curves can be attributed to the PS imparting thermal stability to the hydrogels.…”

Section: Contact Angle Resultsmentioning

confidence: 99%

“…The first weight loss curve (~15%) from 40°C to 110°C shows loss of free water molecules. The second weight loss curve (~39%) from 110°C to 350°C shows degradation of thermosensitive hydrogel that includes β‐GP degradation from 150°C to 250°C 42 . The loss of water molecules bonded by strong hydrogen bonds occurred at 400°C.…”

Section: Resultsmentioning

confidence: 99%

Physico‐chemical properties and in‐vitro biocompatibility of thermo‐sensitive hydrogel developed with enhanced antimicrobial activity for soft tissue engineering

Shahzadi,

Zeeshan,

Tabassum

et al. 2023

Polymers for Advanced Techs

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Smart materials such as thermo‐sensitive in situ forming hydrogels can be effective agents in drug delivery and tissue regeneration with minimal invasion. Injection method would avoid complex surgical procedures facilitating rapid recovery process. In this research, we report the fabrication of an easy, reproducible thermo‐sensitive hydrogel constituting of chitosan (CHI), glycerol phosphate (GP) with variable quantity of ‐poly‐l‐lysine (PS). Fourier‐transform infrared spectra exhibited hydrogel formation where interactions between CHI and GP were seen. The gelation kinetics presented gelation time of 8 min at physiological temperature. The results indicated an increase in degradation rate with the passage of time. Contact angles measurements were employed to observe hydrophilic characteristics which were shown to be favorable. Mechanical strength was determined to be in the range of ~0.1–0.6 MPa for all the hydrogels. Due to intrinsic antibacterial features of CHI and PS, the hydrogels showed potent antibacterial activity against Escherichia coli, Staphylococcus aureus, and Methicillin‐resistant S. aureus (MR‐SA). Interestingly, PS's addition in the hydrogel resulted in potent antibacterial activity against clinically relevant MR‐SA. The hydrogels can hence be delivered to a specific target for localized treatments where the potential of inhibiting multidrug resistant strain is clinically relevant. Biocompatibility of the hydrogels was seen by an overall increase in cell viability of mouse fibroblast cells and scratch assay revealed favorable migration potential. Proangiogenic Vascular endothelial growth factor (VEGF)'s expression showed a gradual increase with increasing concentration of PS, whereas one composition demonstrated a slight increase in the expression of cytosolic prostaglandin E synthase (cPGES) as determined by RT‐PCR. Overall, an increase in PS content of the hydrogels resulted in simultaneously enhanced antibacterial efficiency and marked increase in fibroblast cell viability, hence, reiterating their potential as potent antibacterial agents that can be explored as wound healing agents. In conclusion, novel antibacterial thermo‐sensitive hydrogels were synthesized with a potential of regulating proangiogenic and tissue regeneration factors that highlight their role as wound healing agents.

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Synthesis, characterization, thermal, and antibacterial activity studies on MgO powders

Demirci

Kiran-Yildirim

Tünçay

et al. 2021

J Sol-Gel Sci Technol

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Thermogravimetric Analysis and Chemical Kinetics for Regeneration of Sodium and Potassium Carbonate Solid Sorbents

Cited by 15 publications

References 26 publications

Thermal and Kinetic Studies on Biomass Degradation via Thermogravimetric Analysis: A Combination of Model-Fitting and Model-Free Approach

Thermal and Kinetic Studies on Biomass Degradation via Thermogravimetric Analysis: A Combination of Model-Fitting and Model-Free Approach

Physico‐chemical properties and in‐vitro biocompatibility of thermo‐sensitive hydrogel developed with enhanced antimicrobial activity for soft tissue engineering

Synthesis, characterization, thermal, and antibacterial activity studies on MgO powders

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