Article (Scientific journals)
Modification of cellulosic material for rapid dyeability with malachite green dye
Adegoke, Kayode Adesina; Bello, Isah Adewale; Bello, Olugbenga Solomon et al.
2022In Scientific African, 16, p. 01138
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Keywords :
Cotton fabric; Dyeing exhaustion; Malachite green dye; Modifying agents; Thermodynamics; Multidisciplinary
Abstract :
[en] Chemical modification of cellulose fibre is one of the efficient ways to improve the dye uptake and increase the dyeability properties of the fibre. The challenge with dyeing cellulose fibres is poor dye uptake and unsatisfactory dye fixation. The major scope of this study is to determine the optimum dyeing conditions that will guarantee the dye fastness onto the cotton fabric. Four modifying agents (sodium chloride (NaCl), ammonium sulphate ((NH4)2SO4), hydrated sodium carbonate (Na2CO3•10H2O), and acetic acid (CH3COOH)) in aqueous form were employed in the treatment of the cotton fabrics in a slacked condition. The study examined changes in thermodynamic parameters due to dyeing modified cotton fabric with malachite green (MG) dye. The equilibrium percentage dye exhaustions (%E), which is a measure of dye uptake by the fabrics were determined prior to and post-modification of the cellulose at varying concentrations and temperatures. The optimum values of %E obtained for the modification agents viz: CH3COOH, NH4)2SO4, NaCl, and Na2CO3•10H2O were: 89.71%, 88.57%, 85.71%, and 68.70% at concentration 2% v/v and temperature of 70 °C. The%E of modified cotton fabric dyed with malachite green was optimum in acidic conditions (i.e.CH3COOH with%E of 89.71%) followed by (NH4)2SO4; 88.57%, which undergoes hydrolysis in an aqueous solution. This was then followed by NaClaq (i.e. a neutral solution) and Na2CO3•10H2O (i.e. an alkaline solution). However, all modifying agents used enhanced the dye uptake. The values of partition coefficient (K) were in the order of 1307.73 L.tkg−1, 1162.34 L.tkg−1, 899.69 L.tkg−1, and 329.23 L.tkg−1, respectively at 70 °C; while the values for standard affinities (-Δμθ) were 20,463.94 kJ.mol−1, 20,127.85 kJ.mol−1, 19,397.40 kJ.mol−1, and 16,530.65 kJ.mol−1. This implies a correlation between the equilibrium exhaustion and standard affinity of dyed modified cotton fabric. The values of entropy change (ΔSθ) are 175.53 J.mol−1K−1, 141.29 J.mol−1K−1, 148.16 J.mol−1K−1, 81.023 J.mol−1K−1 and 255.10 J.mol−1K−1 for the four modifying agents, respectively, which implies that the reaction is feasible (spontaneous) whereas ΔHθ are -39,729 kJ.mol−1, -28,144 kJ.mol−1, -31,531 kJ.mol−1, -11,669 kJ.mol−1 and -73,928 kJ.mol−1, respectively. The negative values of ΔHθ suggested that the reactions were exothermic. This study established that modifying agents on cotton fabric is one of the finest ways to improve the affinity between dye and fabric, thereby significantly reducing the time, cost, and stress required to achieve an optimal result in the dyeing process.
Disciplines :
Chemistry
Author, co-author :
Adegoke, Kayode Adesina ;  Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria ; Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
Bello, Isah Adewale;  Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
Bello, Olugbenga Solomon;  Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
Balogun, Mujeeb Adeyemi ;  Faculty of Science and Technology, University of the Basque Country, Basque, Spain ; College of Science and Technology, University of Bordeaux, Bordeaux, France ; Faculty of Sciences, University of Liège, Liège, Belgium
Maxakato, Nobanathi Wendy;  Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
Language :
English
Title :
Modification of cellulosic material for rapid dyeability with malachite green dye
Publication date :
2022
Journal title :
Scientific African
eISSN :
2468-2276
Publisher :
Elsevier
Volume :
16
Pages :
e01138
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
UJ - University of Johannesburg
Funding text :
K. A. Adegoke acknowledges the Global Excellence Stature (GES) 4.0 Postdoctoral Fellowships Fourth Industrial Revolution and the University of Johannesburg, South Africa. O. S. Bello acknowledges the support received from LAUTECH 2016 TET Fund Institution Based Research Intervention (TETFUND/DESS/UNI/OGBOMOSO/RP/VOL. IX). N. W. Maxakato acknowledges the supports received from the National Research Foundation of South Africa: Grant Number 118148 and Centre for Nanomaterials Science Research - University of Johannesburg , and University of Johannesburg , South Africa.
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