Dr. Md. Mahbubul Bashar - Academia.edu (original) (raw)

Papers by Dr. Md. Mahbubul Bashar

Cellulose nanofiber (CNF) has received great attraction in academia and industry owing to its out... more Cellulose nanofiber (CNF) has received great attraction in academia and industry owing to its outstanding physiochemical features such as high mechanical strength, low density, optical transparency, adaptable surface chemistry, renewability and biocompatibility. 1 Consequently, CNF is the most important candidate in designing the next generation products and processes for automotive industries, construction, marine or aerospace engineering, electronics devices, drug excipient and drug delivery, membranes, sensors, electroactive polymers. 2 Nevertheless, the major application area of CNF is the nanocomposites where it is used as a filler, yet, it has an immense scope to be applied as a functional building block to design new materials and products. Therefore, in this thesis CNF has been used as a building block material to design CNF films with nanoscale dimension and introduced CNF in controlling surface wettability for oil-water separation by a simple modification route as well as isolation and functionalization of CNF by a facile and robust method. Owing to its high optical transparency, 3 flexibility, 4 and desired electrical properties, 5 CNF has been used in designing electronic devices as a substrate combined with different functional materials. But to date the cellulose films used in fabricating the devices are typically made with thickness well over 10 μm. 6 The first part (Chapter 2) of the thesis describes a stable CNF

Textile & Leather Review

The adsorption performance, kinetics, and thermodynamic parameters of reactive dyes on chitosan-t... more The adsorption performance, kinetics, and thermodynamic parameters of reactive dyes on chitosan-treated cotton fabric are described in this research. The batch experiment was carried out to investigate the influence of pH, time, temperature, dye concentration, and material to liquid ratio of Remazol Red RR and Remazol Yellow RR, two widely used reactive dyes. The adsorption of red and yellow dyes was observed at λmax 517 and 419 nm respectively. For both Remazol Red RR and Remazol Yellow RR reactive dyes with starting dye concentrations of 0.0667 and 40 mg/L, the greatest dye adsorption was reported at pH 11 (0.0009 and 0.1284 mg/g) and pH 4 (0.0004 and 0.1038 mg/g). The adsorption performance was investigated using the Langmuir and Freundlich isotherms. The adsorption behaviours of the two reactive dyes closely matched to the Langmuir adsorption isotherm (R2>0.98) than Freundlich isotherm (R2>0.92). The pseudo-second-order kinetic model (R2>0.99) was followed by the dyeing...

Journal of Molecular Liquids

Sensors and Actuators A: Physical

Textile & Leather Review

Natural colourants were widely employed in the ancient world to colour cotton garments. With the ... more Natural colourants were widely employed in the ancient world to colour cotton garments. With the revolution of synthetic dyes, natural dyes have lost their position in respect of some performance. However, nowadays the demand for sustainable and eco-friendly products is increasing worldwide due to the awareness of ecological balance. The purpose of this study is to utilize natural colourants in printing on cotton fabric. In this regard, the colourants were extracted from myrobalan fruit, pomegranate peel and catechu, which were eventually applied to the fabric by screen printing technique. The print paste was prepared with carboxymethyl cellulose (CMC) as a natural thickener and polyvinyl alcohol (PVA) as a synthetic thickener. The stability of the print paste was studied with respect to time elapse by viscosity measurement. The depth of shade and colour fastness of the printed fabric were measured. K/S value was evaluated with respect to the stability of print paste. The viscosity ...

Composites and Advanced Materials

Bio-based materials have attracted ample research interest due to their intrinsic beneficial impa... more Bio-based materials have attracted ample research interest due to their intrinsic beneficial impact on human society. Microcrystalline cellulose (MCC) extracted from a variety of bioresources is one of the most prominent candidate in this regard. Herein, the MCC was synthesized from jute fiber by a facile ammonium persulfate (APS) oxidation method resulting in carboxylic functional groups on the fiber surface. The carboxylated MCC was utilized to develop polyvinyl alcohol (PVA) composite films in a solution casting method. The surface chemistry, thermal properties, and surface morphology of MCC and MCC-PVA composite films were studied by FT-IR spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The SEM images confirmed the rod-like MCC with average particle diameter 4.6 μm and length in 48.4 μm. The FT-IR spectroscopy suggested the complete removal of lignin and hemicellulose from jute fiber. A peak at 1730 cm−1 was introduced in MCC due to oxidation with APS...

Renewable and Sustainable Energy Reviews, 2022

Herein, the microcrystalline cellulose (MCC) was obtained from jut fiber by ammonium persulfate (... more Herein, the microcrystalline cellulose (MCC) was obtained from jut fiber by ammonium persulfate (APS) oxidation process and thus polyvinyl alcohol (PVA) composite films were prepared by the reinforcement of MCC in a solution casting method. The surface chemistry, thermal properties and surface morphology of MCC and PVA-MCC composite films were studied by FT-IR spectroscopy, thermogravimetric analyzer and scanning electron microscopy. The SEM images confirmed the rod like MCC with average particle diameter 4.6 µm and length in 48.4 µm. The FT-IR spectroscopy revealed the complete removal of lignin and hemicellulose from jute fiber. A peak at 1730 cm− 1 was introduced in MCC due to oxidation with APS. The absorption peak of –OH groups in PVA-MCC composite films were shifted, somewhat disappeared and weakened due to the intra and inter molecular hydrogen bonding of MCC and OH groups in PVA. Thermogravimetric analysis expressed the thermal behavior of MCC and PVA-MCC composite films. In...

Dimensional stability of cotton knitted fabric is a very crucial parameter which is important to ... more Dimensional stability of cotton knitted fabric is a very crucial parameter which is important to maintain for dye house operations. Due to structural limitations dimensional change of cotton is much higher in case of knit fabric than the woven one. In exhaust dyeing the fabric needs to undergo mechanical finishing by different machines such as slitting, dewatering or squeezing, stenter or tensionless dryer and open or tube compactor. In this study the effect of squeezer machine, stenter and open compactor was investigated on different structure of knit fabrics such as single jersey, 1x1 rib and pique of different GSM. It is found that GSM of the fabric remains about 9.21, 7.32 and 7.29% lower than the target GSM in case of single jersey, 1x1 rib and pique fabric respectively after dewatering which is overcome after stentering and compacting. Lengthwise shrinkage is significant for all fabric structure. The shrinkage of single jersey, 1x1 rib and pique fabrics found ± 5% after subseq...

Journal of Natural Fibers, 2016

ABSTRACT This paper includes the investigation on the dyeing performance of reactive and basic dy... more ABSTRACT This paper includes the investigation on the dyeing performance of reactive and basic dyestuff regarding jute fiber and discusses their benefits and shortcomings. Plain woven jute fabric samples of 261 GSM were dyed with 0.5%, 1.0%, and 4.0% shade of basic and reactive dyes. Then the dyeing performance of both dyestuffs was analyzed. It has been found that exhaustion of basic dye is considerably greater than reactive dye, while this exhaustion decreases for basic dye and increases for reactive dye with the increment of respective shade percentages. This phenomenon has also been verified through the absorption curve, i.e. K/S value of fabric dyed with both dyestuffs in three different shade percentages. Again strong covalent bond is formed during the fixation of reactive dye with the cellulose of jute fiber, and at the same time no strong bond was created in case of basic dye. Finally the color fastness properties have been assessed through rubbing and washing. Both the dye classes have shown nearly similar ratings in case of dry rubbing. However, in case of wet rubbing and wash fastness to color change and color staining; the samples dyed with reactive dyes showed superior fastness ratings over the basic dyed samples.

Journal of Cleaner Production, 2016

Fresh water is a precious natural resource that has been currently facing a severe stress because... more Fresh water is a precious natural resource that has been currently facing a severe stress because of its growing consumption by the industrialised civilisation. The global scarcity of fresh water has warranted an increasing demand for the treatment, recycling and reusing of wastewater for industrial purposes. This paper investigates the use of high energy gamma radiation to degrade and decontaminate combined textile wastewater and its potential application in textile wet processing and reuse for irrigation purposes. The treatment was carried out using a Cobalt-60 gamma radiation source at 10 kGy irradiation dose with a dose rate of 13 kGy/h. The change in pH, decolouration percentage, reduction of total suspended solids, total dissolved solids, biological oxygen demand and chemical oxygen demand, variation of electrical conductivity and heavy metal content of irradiated wastewater were extensively investigated. Then the treated wastewater was recycled for cotton fabric processing and reused in the irrigation of Malabar spinach plant. The detailed experimental results demonstrated that the irradiated wastewater can be satisfactorily used as an alternative to fresh water for scouring-bleaching and dyeing of cotton fabric. The risk to human health of fabric dyed with irradiated wastewater was also investigated. Carcinogenetic risk analysed by Gas chromatography–mass spectrometry showed the presence of banned amine in dyed fabric under the detection limit of 10 ppm and the absence of formaldehyde, signifying the non-toxicity of the fabric for human health. In case of a potential use in irrigation, treated wastewater was applied to Malabar spinach plant and compared with a controlled planting using the underground fresh water for irrigation. The plant irrigated with irradiated wastewater exhibited a better growth in terms of leaf count, root length and plant growth. It was further revealed that degradation of the textile dyes by gamma radiation led to an increase in nitrogen content in the irradiated wastewater that itself acted as a biofertiliser providing additional nutrient for a better growth of the aforementioned plant. So it can be concluded that gamma irradiation is a promising tool for the degradation and decontamination of textile wastewater for its safe recycling in textile wet processing and reuse as irrigation water having fertilising properties. Furthermore, the effectual reusing and recycling of irradiated wastewater demonstrated in this research work bear its scientific credibility in application field where consumption of million litres of fresh water per day and concurrently discharging same amount of effluent could be reduced considerably in a single textile dyeing industry.

In the rapid growing world, the demand for clothing especially the readymade garment is one of th... more In the rapid growing world, the demand for clothing especially the readymade garment is one of the key economy factors for the developing countries where cheap manpower is available. But, although having a vital role in the total economy, the textile industry development is not sustainable in the South Asian region causing serious degradation to the environment for its high ground water consumption and large waste discharge. In this research the amount of effluent production was reduced by the application of irradiated chitosan which modify the cotton surface and facilitate it to absorb more color at a lower dye concentration. Raw textile effluent was also treated by gamma radiation and physico-chemical properties were measured. Textile effluent treated by gamma radiation was used for the coloration of cotton fabrics with reactive dyes in exhaust method at 60°C where fresh water served as control. Color fastness to wash, rubbing and perspiration were evaluated. Samples showed very high competitiveness with control samples thus opening a new era for of textile effluent reuse. Irradiated effluent also showed excellent plant growth when irrigated to Malabar spinach plants (80% more dry weight) where raw effluent showed significant growth retardation. Minerals content of the plant was also studied and significant increase of minerals content was found in the samples irrigated with treated effluent than the samples irrigated with fresh water. So, this paper represents a very promising technique for the sustainable development in the textile sector leading to zero waste production facility.

Carbohydrate Polymers, 2015

This study attempts to introduce the exploitation of gamma radiation for the processing of cotton... more This study attempts to introduce the exploitation of gamma radiation for the processing of cotton knitted fabric. A systematic investigation into the situations suitable for eco-friendly preparation (scouring and bleaching) of cotton fabric was carried out. Fabric used in this experiment includes cotton knitted single jersey structure of 160 gsm. The grey cotton knitted fabric was immersed in different (0-30 g/L) amount of hydrogen peroxide solution for 10 minutes. Subsequently, the samples were irradiated under Co-60 gamma radiation of absorbed dose (5-20 kGy) at a dose rate 5 kGy/h. Water absorbency, whiteness index (WI), weight loss, bursting strength, elongation at burst and dye uptake were taken as the measure of extent of scouring and bleaching performance of the intended fabric. The new technology yielded product with acceptable whiteness and water absorbency which is suitable for pale shade dyeing. The optimum results were achieved for the sample irradiated at a total dose 5 kGy treated with 10 g/L H 2 O 2 solution. The water absorbency and WI value were 2.4 seconds and 39.43 respectively as well as 82.2% dye exhaustion was obtained having the bursting strength 203.20 KPa for this option. But higher dose of radiation was found responsible for lowering the bursting strength of the fabric. However, the irradiated samples demonstrated the good dye-ability indicating the excellent level dyeing with Bezaktive Red S-3B and Novacron Yellow ST-3R reactive dyes.

Open Journal of Organic Polymer Materials, 2013

Jute is generally not dyed with reactive dye though it is a cellulosic fiber. Reactive dye is ext... more Jute is generally not dyed with reactive dye though it is a cellulosic fiber. Reactive dye is extensively used to dye cotton, viscose and other cellulosic fibers whereas jute is dyed with basic dye. This paper presents a novel approach to dye the jute fiber with reactive dye after treating with chitosan. Jute fabric was treated with chitosan solution at different concentrations (0.5%, 1%, 2%, 3% and 4%) and then dyed with reactive dye. The depth and fastness of shade of dyed fabric were analyzed by comparing the chitosan treated samples with untreated dyed fabric samples. It has been found that, the dyebath exhaustion is increased with the increment of chitosan concentrations. The exhaustion percentages have found 36.79%, 41.59%, 48.33%, 54.46% and 58.75% for the fabric treated with 0.5%, 1%, 2%, 3% and 4% chitosan solution respectively, while the exhaustion of dyebath is only 23.15% for untreated fabric. The K/S values (at λ max = 540 nm) of dyed samples have found 4.93, 6.77, 10.5, 14.07, 15.57 and 2.37 for 0.5%, 1%, 2%, 3%, 4% and untreated fabric respectively. The color fastness to washing and rubbing of the dyed fabrics was also evaluated. In case of dry rubbing, both types of fabric have shown almost similar fastness ratings. However, chitosan treated fabrics have shown inferior fastness rating in case of wet rubbing and washing, particularly for the fabrics at higher chitosan concentrations.

International Journal of Engineering & Technology, 2014

The scouring and bleaching performance of conventional process (hydrogen peroxide, sodium hydroxi... more The scouring and bleaching performance of conventional process (hydrogen peroxide, sodium hydroxide), was compared to that of enzymatic process using enzyme (arylesterase) which catalyst the discontinuous peroxide reaction. The whiteness and reflectance% indicating bleaching performance and absorbency and weight loss % was used as a measure of the scouring performance. Comparison of these performance and the effects are analyzed by using graphical representation. The weight loss% of enzymatic process was less than conventional process. In conventional process the reflectance % and absorbency increased and whiteness decreased with the increasing of concentration of caustic soda and the aforementioned properties were increased with the increasing of concentration of H2O2. In enzymatic process the reflectance % of cotton fabric increased and whiteness and absorbency fluctuated with the increasing of concentration of enzyme. Meanwhile reflectance %, absorbency and whiteness increased wi...

Journal of Polymers and the Environment, 2012

About 48 % cotton fiber is consumed as clothing materials all over the globe. It is popular for s... more About 48 % cotton fiber is consumed as clothing materials all over the globe. It is popular for softness, versatility, absorbance and breathability. Cotton is hydrophilic in nature and therefore, it can absorb sweat from the human body and can release in the surface that makes it comfortable. But it has some inherent limitations such as wrinkle, shrinkage, low dye uptake and microbial degradation. Various approaches have been made to overcome the above limitations. Surface modification of textiles to impart antimicrobial activity, shrinkage, wrinkle resistance, decreased skin irritation, increase dye exhaustion and even enhancing fragrance is the most recent trends in textile chemistry. Various monomers, polymers and biopolymers are applied in different ways to improve different properties of cotton. Chitosan is the mostly used biopolymer in this regard for its biocompatibility, biodegradability, nontoxicity and antimicrobial activity. This paper is a short overview of the most recent development in surface modification of cotton using biopolymers such as chitosan, starch and its derivatives and some other synthetic monomers and polymers.

Langmuir, 2019

We describe a systematic approach for producing cellulose nanofiber (CNF) nanosheets using the La... more We describe a systematic approach for producing cellulose nanofiber (CNF) nanosheets using the Langmuir-Blodgett (LB) technique. The CNFs were obtained from sulfuric acid hydrolysis of commercially available microfibrillated cellulose. Needle-like CNFs, negatively charged by grafted sulfate groups, were maintained at the air-water interface, assisted by amphiphilic polymer, poly( N-dodecyl acrylamide) (pDDA). The CNFs produced a stable monolayer. The surface pressure increased steadily with a high collapse pressure of 50 mN m-1 when spread with formic acid and pDDA. The composite monolayers were transferred onto solid substrates as Y-type LB films using a vertical dipping method. Upstroke and downstroke transfer ratios of the films were, respectively, unity and 0.88, indicating that full coverage was achieved by the monolayer even for more than 200 layers. Results obtained using atomic force microscopy, Fourier transform infrared, and X-ray photoelectron spectroscopy showed that CNF nanosheets possess well-defined layer structures with average monolayer thickness of 5.3 nm. The relative amount of CNFs in the nanosheets was calculated as 62.6 wt % using the quartz crystal microbalance technique. The as-prepared nanosheets are optically transparent to visible light and have high hydrophobicity. In fact, the nanosheet transparency was higher than 88% at 600 nm wavelength for 24 layers. A miniscule amount of pDDA enables demonstration of free-standing CNF nanosheets with 1 cm width and 45.6 nm thickness (23 layers).

Cellulose, 2019

This report describes the synthesis of highly carboxylated cellulose nanocrystals (CNCs) from jut... more This report describes the synthesis of highly carboxylated cellulose nanocrystals (CNCs) from jute fiber by facile oxidation with ammonium persulfate (APS). The oxidation time effects on microstructure, surface chemistry, crystal structure, and thermal properties were investigated. Crystal-like morphology was obtained with 5.2 nm average particle diameter and 300-500 nm length, depending on the oxidation time. The degree of oxidation (DO) was found to be 0.27: the highest among APS-oxidized CNCs. The carboxylic group amount of 1550 mmol kg-1 was achieved for 16 h oxidation treatment, resulting in high surface charge with the absolute zeta potential value of 40 mV. The DO value was well correlated with the peak intensity of carbonyl group ascertained from FT-IR studies: 0.12 ? 0.38(I 1730 /I 1060). As-prepared CNCs showed improved dispersibility in organic solvents up to 15 h. The APS oxidized CNCs showed good thermal stability: the onset decomposition temperature was 240°C. Using X-ray diffraction method the crystalline index was ascertained as more than 67%. Surface modification of APS-oxidized cellulose nanofibers (CNFs) was confirmed using FT-IR and XPS. Modified CNFs were dispersed in organic solvents such as toluene and THF. Jute is a good candidate material for obtaining highly pure and crystalline CNCs through APS oxidation, exhibiting great potential as a functional material for use in diverse fields.

RSC Advances, 2017

Fluorinated cellulose nanofiber assemblies exhibit high oil–water separation efficiency and recyc... more Fluorinated cellulose nanofiber assemblies exhibit high oil–water separation efficiency and recyclability (at least 50 times) for practical applications.

Textile & Leather Review

Journal of Molecular Liquids

Sensors and Actuators A: Physical

Textile & Leather Review

Composites and Advanced Materials

Renewable and Sustainable Energy Reviews, 2022

Journal of Natural Fibers, 2016

Journal of Cleaner Production, 2016

Carbohydrate Polymers, 2015

Open Journal of Organic Polymer Materials, 2013

International Journal of Engineering & Technology, 2014

Journal of Polymers and the Environment, 2012

Langmuir, 2019

Cellulose, 2019

RSC Advances, 2017