Radiation activation of cotton-cellulose prior to alkali treatment

Takács, Erzsébet; Wojnárovits, László; Földváry, Cs; Borsa, Judit; Sajó, István E.

doi:10.1163/15685670152622103

Cited by 28 publications

(8 citation statements)

References 6 publications

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“…The results suggest that random scission in glucosidic bond predominates in the degradation procedure8, 17 and the number of scissions has a positive correlation with the absorbed dose. The decreasing of DP will make MCC more accessible for further usage.…”

Section: Resultsmentioning

confidence: 90%

Radiation degradation of microcrystalline cellulose in solid status

Sun¹,

Xu²,

Ge³

et al. 2012

J of Applied Polymer Sci

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Pulverization and degradation are important pretreatment procedures in producing bio-ethanol from cellulose. In this study, microcrystalline cellulose (MCC), a pure a-cellulose, was degraded by c-irradiation. The average degree of polymerization, content of reducing sugar, crystalline structure, and molecular structure were investigated to elucidate the radiation effect on the degradation of MCC. The results manifested that c-ray destroyed part of the chemical bond and hydrogen bond, leading to the degradation of cellulose and increasing of the reducing sugar content. According to the Fourier transform infrared result, radiation degradation led to the formation of reductive carbonyl group. Meanwhile, radiation had slight influence on the crystalline structures of MCC. Therefore, the radiation degradation procedure is expected to benefit the further proceedings such as ultrafine treatment and enzyme hydrolysis of cellulose.

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Section: Resultsmentioning

confidence: 90%

Radiation degradation of microcrystalline cellulose in solid status

Sun¹,

Xu²,

Ge³

et al. 2012

J of Applied Polymer Sci

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“…Also γ ‐ray irradiation is known to be another very efficient technique for surface area enhancement. The γ ‐ray will cleave 1,4‐glycosidic bonds of cellulose macromolecules and make finer biomass particles with more micro and macro pores and higher surface area . Combination of these physicochemical treatments could improve the surface area and pores within the lignocellulosic biomasses and could improve their fluoride removal capacities.…”

Section: Fluoride Removal By Nonliving Biomassmentioning

confidence: 99%

Biomass for water defluoridation and current understanding on biosorption mechanisms: A review

Manna

Roy

Adhikari

et al. 2018

Env Prog and Sustain Energy

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Excessive fluoride (above 1.5 mg/L) containing water consumption for prolonged periods could pose health hazards, for example, dental fluorosis. Longer exposure could also cause skeletal fluorosis leading to the permanent deformity to skeleton. In the current context, use of biomasses for defluoridation would be a most economic and sustainable option for water defluoridation over the available alternatives. This article presents a brief summary of processes used biomasses for fluoride removal from aqueous solutions. This article also discusses the theoretical and instrumental approaches used by the researchers till date to understand the defluoridation mechanisms. The literature survey pointed that theoretical models such as Langmuir and Freundlich isotherms, pseudo‐first‐order and second‐order kinetic models, and different thermodynamic equations were also used to define the defluoridation by biomasses. Apart from the theoretical modeling, several researchers have also tried to understand the biomass‐based defluoridation by applying advanced instruments, for example, FTIR, XPS, NMR, TG, FESEM, and Raman spectroscopic analysis. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1560–1572, 2018

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“…At high dose, the fabric becomes enough photomodified and insoluble impurities along with colourant get maximum chance to sorb due to which low strength with uneven shades are observed. Some loss in mass of fabric might be occurred as well degradation of fabric may be possible due to which less colour strength is observed 7 . At 6 kGy, the surface of fabric become photomodified and the surface of cellulose may convert into carboxylic acid, which upon dyeing form firm bond with dye molecules, which upon investigation in spectraflash give high colour strength.…”

Section: Resultsmentioning

confidence: 99%

Dyeing Behaviour of g-Irradiated Cotton Using Amaltas (Cassia fistula) Bark Extracts

Adeel¹,

Fazal-ur-Rehman²,

Gulzar³

et al. 2013

Asian J. Chem.

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Amaltas bark (Cassia fistula) has been used as natural colourant for dyeing of un-irradiated and irradiated cotton fabric. Both cotton fabric and dye powder has been exposed to absorbed doses of 2, 4, 6, 8 and 10 kGy using Cs 137 γ-irradiator. Dyeing parameters such as temperature and time were optimized. To improve colour strength pre and post mordanting using copper and iron as mordants was carried out. Suggested ISO standard methods for colour, fastness to light, washing and rubbing were employed to observe fastness properties. It is observed that dyeing of irradiated fabric at 50 ºC for 50 min using Cu as pre-mordant (4 %) has not only given good colour strength with darker shades but also acceptable fastness properties are obtained. It is concluded that γ-irradiation has a promising effect in improvement of colour strength and colourfastness properties and it can be applied on other fabrics dyed with other natural colourants.

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Radiation activation of cotton-cellulose prior to alkali treatment

Cited by 28 publications

References 6 publications

Radiation degradation of microcrystalline cellulose in solid status

Radiation degradation of microcrystalline cellulose in solid status

Biomass for water defluoridation and current understanding on biosorption mechanisms: A review

Dyeing Behaviour of g-Irradiated Cotton Using Amaltas (Cassia fistula) Bark Extracts

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