Boron Adsorption Using NMDG-Modified Polypropylene Melt-Blown Fibers Induced by Ultraviolet Grafting

Abstract

Boron is in high demand in many sectors, yet there are significant flaws in current boron resource utilization. This study describes the synthesis of a boron adsorbent based on polypropylene (PP) melt-blown fiber using ultraviolet (UV)-induced grafting of Glycidyl methacrylate (GMA) onto PP melt-blown fiber, followed by an epoxy ring-opening reaction with N-methyl-D-glucosamine (NMDG). Using single-factor studies, grafting conditions such as the GMA concentration, benzophenone dose, and grafting duration were optimized. Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and water contact angle were used to characterize the produced adsorbent (PP-g-GMA-NMDG). The PP-g-GMA-NMDG adsorption process was examined by fitting the data with different adsorption settings and models. The results demonstrated that the adsorption process was compatible with the pseudo-second-order model and the Langmuir model; however, the internal diffusion model suggested that the process was impacted by both extra- and intra-membrane diffusion. According to thermodynamic simulations, the adsorption process was exothermic. At pH 6, the greatest saturation adsorption capacity to boron was 41.65 mg·g−1 for PP-g-GMA-NMDG. The PP-g-GMA-NMDG preparation process is a feasible and environmentally friendly route, and the prepared PP-g-GMA-NMDG has the advantages of high adsorption capacity, outstanding selectivity, good reproducibility, and easy recovery when compared to similar adsorbents, indicating that the reported adsorbent is promising for boron separation from water.

Fabrication of stretchable and high‐filtration performance melt‐blown nonwoven webs for PM0.3 aerosol filtration

“…At around 387 C, the PP sample exhibited thermal degradation, resulting in a weight loss of 91.47%. This agrees with the results found by Yu et al, in their study of thermal stability analysis of PP via TGA in the nitrogenous environment, it was noticed that PP melt-blown fiber exhibits degradation around 380 C. 37 On the other hand, past studies suggest that PP is more thermally stable than TPU. 16 As a result, PP filter material experienced thermal degradation at a higher temperature compared with PP-TPU-based filter nonwovens.…”

“…For PP, 90PP‐10TPU, and 80PP‐20TPU melt‐blown samples three major peaks with different intensities were observed in the XRD graph. Looking at melt‐blown PP the main characteristic peaks at 2 θ of 14.46°, 16.82°, and 21.56° correspond to crystal plane diffraction of (110), (040), and (131), respectively 37 . The presence of PP‐G‐mA grafting inside PP polymer does not change the crystallinity structure of melt‐blown PP fibers.…”

“…This result was consistent with past literature. For instance, no changes in the crystal form of melt‐blown PP fibers were noted with the additional increment of grafting of Glycidyl methacrylate (GMA) onto PP as examined by Yu et al 37 On the other hand, while considering the XRD graph, no remarkable differences were seen in the peaks between melt‐blown PP, 90PP‐10TPU, and 80PP‐20TPU melt‐blown fibers, and hence, 90PP‐10TPU and 80PP‐20TPU likewise retain the crystal form of PP melt‐blown nonwoven fibers. This shows that the addition of 10 and 20 wt.% TPU onto PP does not have considerable influence on the crystallinity of melt‐blown PP.…”

“…Looking at melt-blown PP the main characteristic peaks at 2θ of 14.46 , 16.82 , and 21.56 correspond to crystal plane diffraction of (110), (040), and (131), respectively. 37 The presence of PP-G-mA grafting inside PP polymer does not change the crystallinity structure of melt-blown PP fibers. This result was consistent with past literature.…”

Preparation and Adsorption Performance of Boron Adsorbents Derived from Modified Waste Feathers

“…− ions. The anionic functional groups in the adsorbent experience electrostatic repulsion with the borate ions, resulting in decreased adsorption [39].…”