Tuning N-methyl-d-glucamine density in a new radiation grafted poly(vinyl benzyl chloride)/nylon-6 fibrous boron-selective adsorbent using the response surface method

Abstract

A new adsorbent containing boron-selective groups was prepared by radiation induced grafting of vinyl benzyl chloride (VBC) onto nylon-6 fibers followed by functionalisation with N-methyl-D-glucamine (NMDG). The density of glucamine loaded in the adsorbent was tuned by optimisation of the reaction parameters such as NMDG concentration, reaction temperature, reaction time and degree of grafting using response surface methodology (RSM) employing Box-Behnken design (BBD). The optimum parameters for achieving the maximum glucamine density (1.7 mmol g À1 ) in the adsorbent are 10.6%, 81 C, 47 min and 121% for the NMDG concentration, reaction temperature, reaction time and degree of grafting (DG), respectively. The deviation between the optimum experimental and predicted glucamine density is found to be 1.2% suggesting the reliability of RSM in predicting the yield and optimising the functionalisation reaction parameters. The chemical composition, morphology and structure of the NMDG-containing fibrous adsorbent were studied using Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The thermal properties were determined using differential scanning calorimetry (DSC) and the thermal stability was evaluated by thermogravimetric analysis (TGA). Considering the physico-chemical properties of the fibrous adsorbent and the preliminary results of boron adsorption, it can be suggested that this adsorbent is a promising candidate for boron removal.

Functionalized Porous Aromatic Frameworks as High‐Performance Adsorbents for the Rapid Removal of Boric Acid from Water

“…In the second modification step, NMDG was appended to the pore walls of the frameworks via a nucleophilic substitution reaction with the –CH 2 Cl groups. Successful incorporation of NMDG was confirmed via FTIR spectroscopy, with the disappearance of the band at 1266 cm −1 and the appearance of three new bands at 1072, 1017, and 3300–3600 (broad) cm −1 that were attributed to the C–O, C–N, and hydroxyl groups of NMDG, respectively . Further support for successful incorporation of NMDG was afforded from MAS 13 C NMR spectroscopy, with the appearance of a broad resonance at ≈72 ppm that was attributed to the carbon atoms in NMDG.…”

An updated review on boron removal from water through adsorption processes

“…Xu et al reported a silica-supported NMDG adsorbent (Si-MG) constructed by anchoring NMDG-modified (3glycidoxypropyl) trimethoxysilane to a silica surface with a maximum adsorption capacity of 1.54 mmol g −1 [57. Ting et al prepared a novel boron-selective adsorbent by radiation-induced grafting of vinyl benzyl chloride onto nylon-6 fibers followed by functionalization with NMDG [58]. A spherical organic-inorganic hybrid boron-selective adsorbent with organosiloxane functionalized with NMDG functional groups was also reported [59].…”

Experimental Investigation of the Properties of Laminated Nonwovens Used for Packaging of Powders in Mineral Warmers

“…PE melting is reflected by a broad peak with two maxima at 105°C and 120°C, while nylon melting is associated with a narrow peak with one maximum at 219°C. DSC analysis performed separately for the nylon nonwoven (PA) has revealed that the endothermic transition characterized by a broad peak with a maximum at approximately 60°C in the first heating cycle is associated with the T g of nylon, which is obscured by a peak attributable to moisture or other substances that may be present in the commercially available product [17]. In turn, the endothermic peak above 200°C reflects crystalline phase melting in the nylon nonwoven.…”