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- 저자 : Ting Teo Ming (검색결과 2 건)
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Madana Leela Nallappan,Mohamed Mahmoud Nasef,Teo Ming Ting,Arshad Ahmad 한국섬유공학회 2018 Fibers and polymers Vol.19 No.8
Nanofibrous poly(vinylidene fluoride) (PVDF) sheets were produced by electrospinning and grafted with oxirane groups using radiation induced grafting of glycidyl methacrylate (GMA) followed by treatment with N-methyl-D-glucamine (NMDG). The NMDG density in the nanofibers was tuned by optimization of the immobilisation reaction variables using response surface methodology (RSM). The various properties of NMDG-containing nanofibers were evaluated using Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The NMDG-containing nanofibers were tested for boron selective removal from solutions. A maximum glucamine density yield of 2.2 mmol/g was obtained at 15 wt%, 87 oC, 64.7 min and 150 % for NMDG concentration, temperature, time and degree of grafting (DG), respectively. The applied procedure incorporating RSM was found to be highly effective in the optimization of covalently immobilised glucamine on the oxirane modified PVDF based-nanofibrous structure and in imparting an excellent combination of physico-chemical and boron retention properties. A complete boron removal was achieved in 100 mg/l boron solution adsorbent with a dosage of 0.6 g at pH 7 in 2 h time. This was accompanied by a promising reusability suitable for boron removal from solutions.
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Modification of Radiation Grafted Banana Trunk Fibers for Adsorption of Anionic Dyes
Sarala Selambakkannu,Nor Azillah Fatimah Othman,Khomsaton Abu Bakar,Ting Teo Ming,Reshina Devi Segar,Zulhairun Abdul Karim 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
Pre-treated banana fiber were successfully grafted with glycidyl methacrylate (GMA) by employing preirradiationgrafting technique with the aid of electron beam accelerator. GMA-grafted fibers were subsequentlyfunctionalized with trimethylamine (TMA). TMA functionalized fibers were subjected to elemental analysis to quantify thepresence of nitrogen on the fibers. The adsorption of anionic dyes, acid blue (AB 80) and acid red (AR 86) in aqueoussolution by TMA functionalized fibers were studied in this paper. The adsorption kinetics were evaluated with pseudo-firstorder and pseudo-second order. The kinetic adsorption data obtained follows the pseudo-second kinetic model which issupported by higher coefficient value, r2 > 0.99, good agreement with qe,cal and qe,exp values and also represents chemisorptionprocess control. The equilibrium adsorption data were also analyzed by Langmuir and Freundlich adsorption isotherm model. The adsorption of AB 80 dye obeys the Langmuir adsorption model whereas adsorption of AR 86 dye obeys the Freundlichadsorption isotherm model. Adsorption capacity of AR 86 dye is higher than AB 80 dye. The adsorption process wasfavorable as shown by the separation factor (RL) in the range of 0 < RL < 1. In desorption studies, high amount dyes waseluted with mixture of 50 % methanol + 30 % NaCl (0.5N) + 20% NaClO (1.0N).
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