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Application of Sulfonated GMA-g-non Woven PE Fabric for the Efficient Removal of Methylene Blue Dye from Wastewater
Md. Sohel Rana,
Nazia Rahman,
Tofail Ahmed Chowdhury,
Nirmal Chandra Dafader,
Shahnaz Sultana,
Md. Nabul Sardar,
Md. Nahid Kayser
Issue:
Volume 7, Issue 1, March 2021
Pages:
1-9
Received:
26 November 2020
Accepted:
28 December 2020
Published:
15 January 2021
Abstract: An environmental affable, economically feasible and reusable sulfonated adsorbent were constructed by gamma radiation grafting of glycidyl methacrylate (GMA) on non-woven polyethylene fabric and subsequent chemical modification. Highest graft yield of 343.31% was obtained at favourable conditions: 30 kGy radiation dose, 5% monomer concentration, adding up of 0.5% Tween-20 as an additive, 4 h reaction time. The epoxide group containing GMA-g-PE film were functionalized through sulfonation. The adsorbent was identified by Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Thermo-gravimetric Analysis (TGA). The aqueous solutions of methylene blue were prepared in various concentrations and adsorption behavior by the developed sulfonated-GMA-g-PE film were investigated. MB uptake capacity at different environment such as contact time, pH and initial MB concentration were identified. The adsorption of MB is highly pH dependent and utmost sorption was found at pH 7. The kinetic adsorption data were interpreted by pseudo-first-order and pseudo-second-order equations. Pseudo-first-order rate kinetic model is more applicable for the sorption process due to its higher correlation coefficient. From the two isotherm model Langmuir and Fruendlich, Fruendlich model attuned best with the MB sorption as presented by higher correlation coefficient. The MB uptake capacity of the sorbent obtained from Langmuir model was 500 mg/g. Futhermore, the adsorbent could be reformed and reused repeatedly for the sorption of MB from waste water.
Abstract: An environmental affable, economically feasible and reusable sulfonated adsorbent were constructed by gamma radiation grafting of glycidyl methacrylate (GMA) on non-woven polyethylene fabric and subsequent chemical modification. Highest graft yield of 343.31% was obtained at favourable conditions: 30 kGy radiation dose, 5% monomer concentration, ad...
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Influence of Processes on the Properties of Nano-fibrous Fibers of the Electro-spinning Polyamide-6
Mohamed Moussa,
Fabien Salaün,
Neda Shah Hossein,
Rajerison Wilson
Issue:
Volume 7, Issue 1, March 2021
Pages:
10-15
Received:
29 December 2020
Accepted:
16 January 2021
Published:
2 February 2021
Abstract: This study focuses on the influence of electrospinning processes on the properties of electrospun fibres. We have optimised the parameters: distance, voltage, concentration of electrospinning to analyse the influence of these parameters on the properties, in particular the structure and morphology of the nano-fibres. The mass of the required polyamide was measured using an analytical balance and dissolved in formic acid to obtain a homogeneous mixture. The solution was stirred for 24 hours and then cooled and inserted into the syringe to be electro-threaded. The concentration of the solution played a decisive role during the spinning process and influenced in particular the determination of the diameter but also the morphology of the nanofibres. A concentration of 15% PA-6 and a low viscosity solution of 266 mPa allowed us to obtain higher quality fibres. The results obtained by the SEM show that the increase in the electric field causes the fibre diameter to increase from 170nm to 234nm. The structures, nano-fibre morphologies and thermal properties of PA-6 have been characterised using scanning electron microscopy (SEM), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). Defect-free fibres with extremely small diameters and a large specific surface area were produced. Which we will use to manufacture photo deformable textiles. After spinning the flawless fibres, we can continue this study in the near future by adding a fire retardant active ingredient to the polyamide solution, to improve the resistance of the fibres and their morphology.
Abstract: This study focuses on the influence of electrospinning processes on the properties of electrospun fibres. We have optimised the parameters: distance, voltage, concentration of electrospinning to analyse the influence of these parameters on the properties, in particular the structure and morphology of the nano-fibres. The mass of the required polyam...
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The pH-Triggered Amphiphilic Polycarbodiimides as Nanovesicles
Enosha Harshani De Silva,
Bruce Novak
Issue:
Volume 7, Issue 1, March 2021
Pages:
16-22
Received:
24 February 2021
Accepted:
22 March 2021
Published:
30 March 2021
Abstract: The pH-triggered polymers are a sub-class of stimuli-responsive macromolecules. These smart polymers can experience physical or chemical transition due to small pH responses. pH-dependent materials gain great demand within a short period, by considering their potential applications. pH-triggered macromolecules typically possess weak basic or weak acidic functional groups. The functional groups often used include tertiary amines, pyridines, phosphate, and carboxylic acids. These stimuli-dependent materials are ideal candidates for the biomedical field. Herein, report pH-dependent chiral amphiphilic carbodiimide polymers. Helical polycarbodiimides consist of alternating imine and amine backbone, attached to different pendant groups. Substituting the pendant groups, enable to change of the properties of polycarbodiimides. Thus, we invented polar functional groups such as dimethylamine and piperazine to the side chains to enhance the solubility in an aqueous medium. Moreover, each unit of these polymers consists of hydrophobic methyl functionality and hydrophilic dimethyl and piperazine side groups. Thus, these carbodiimide polymers were self-assembled in aqueous solutions as well as buffer solutions due to the hydrophilic and hydrophobic moieties of the polymer. The micelles can be used as nanocarriers. Furthermore, the pH-dependent swelling properties were observed in these polymeric nanoparticles in different time intervals. Thus, the pH-triggered volume change of the micelles can be used as a controlled release, targeted site drug delivery applications.
Abstract: The pH-triggered polymers are a sub-class of stimuli-responsive macromolecules. These smart polymers can experience physical or chemical transition due to small pH responses. pH-dependent materials gain great demand within a short period, by considering their potential applications. pH-triggered macromolecules typically possess weak basic or weak a...
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