Isotherms and kinetics of dyeing poly-<i>m</i>-phenyleneisophthal-amide with Basic Red 46 based on the macro-cation dyeing mechanism

Sheng, Dan; Deng, Bo; Wang, Yunli; Liu, Ling; Chen, Xin; Xia, Honghui; Cao, Gaoshao; Xu, Weilin

doi:10.1177/0040517520934050

Cited by 2 publications

(2 citation statements)

References 24 publications

(32 reference statements)

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“…The groups on the fiber can only react with specific groups in the dye molecules, and all the groups on the fiber can bind with the dye without affecting each other. When all groups have reacted, the dyeing reaches equilibrium, where the adsorption rate of the dye is equal to the desorption rate where S f is the saturation value of the dye on the fiber.…”

Section: Results and Discussionmentioning

confidence: 99%

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Cleaner Dyeing Technology for Denim Fabrics with Excellent Utilization of Indigo Based on Inert Gas Protection

Wang

Ding

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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Traditional indigo denim dyeing has a remarkable impact on the environment as it consumes large amounts of energy, water, and chemicals. This study examined the feasibility of using nitrogen (N 2 ) protection to overcome dyeing difficulties caused by leuco-indigo early oxidation in cotton fabrics dyed with indigo reduced by sodium dithionite (Na 2 S 2 O 4 ). The effect of N 2 protection on the molecular electrostatic potential (ESP) of indigo and leuco-indigo was investigated by density functional theory calculations, and it was shown that the stability of indigo and leucoindigo increased upon the injection of N 2 . Furthermore, it was discovered that the continuous injection of lower amounts of N 2 during reduction and dyeing with indigo prevented dye agglomeration in a dye bath and produced deeper shades and more level dyeing. Besides, the dyeing kinetic model and thermodynamic parameters showed that the dyeing processes fitted well with the Freundlich model and the adsorption processes were exothermic and spontaneous. Furthermore, orthogonal experiments and gray clustering analysis were used to optimize the dyeing process, and it could increase the K/S and S values of the dyed denim fabric by 10.63 and 54.72%, respectively, compared to the traditional dyeing process. It is evident that the eco-friendly dyeing strategy presented here could significantly enhance denim production's sustainability in the areas of economics, energy efficiency, and environmental protection.

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Section: Results and Discussionmentioning

confidence: 99%

“…When all groups have reacted, the dyeing reaches equilibrium, where the adsorption rate of the dye is equal to the desorption rate. 24…”

Section: ■ Materials and Methodsmentioning

confidence: 99%