Biomimetic Polylactic Acid Electrospun Fibers Grafted with Polyethyleneimine for Highly Efficient Methyl Orange and Cr(VI) Removal

Abstract

The rapid growth of industrialization has resulted in the release of large quantities of pollutants into the environment, especially dyes and heavy metals, which are environmentally hazardous for humans and animals. It is considered as the most promising and environmentally friendly route to develop green materials by using the green modification method, which has no negative impact on the environment. In this work, the green material of polylactic acid (PLA) was used as the substrate material, and a novel modification method of polydopamine (PDA)-assisted polyethyleneimine (PEI) grafting was developed. The electrospun PLA fibers are mainly composed of stereocomplex crystallites, which were achieved via the electrospinning of poly­(l-lactic acid) and poly­(d-lactic acid). The water-soluble PEI was grafted onto the PDA-modified PLA fibers through the glutaraldehyde-assisted cross-linking reaction. The prepared composite fibers can be degraded, which is environmentally friendly and meets the requirements of sustainable development. The potential application of such PLA composite fibers in wastewater treatment was intensively evaluated. The results show that at appropriate fabrication conditions (PDA concentration of 3 g·L–1 and a PEI molecular weight of 70,000 g·mol–1), the composite fibers exhibit the maximum adsorption capacities of 612 and 398.41 mg·g–1 for methyl orange (MO) and hexavalent chromium [Cr­(VI)], respectively. Simultaneously, about 64.79% of Cr­(VI) adsorbed on the composite fibers was reduced to Cr­(III). The above results show that the PLA composite fibers have a good development prospect in the field of wastewater treatment.

Application of 3D printing technology for green synthesis of Fe2O3 using ABS/TPU/chlorella skeletons for methyl orange removal

“…When substantial quantities of MO dye are introduced into an aqueous environment, it results in reduced levels of dissolved oxygen and sunlight penetration, consequently diminishing photosynthesis and causing great harm to the ecological environment. 1–3…”

“…When substantial quantities of MO dye are introduced into an aqueous environment, it results in reduced levels of dissolved oxygen and sunlight penetration, consequently diminishing photosynthesis and causing great harm to the ecological environment. [1][2][3] In recent years, a series of methods have been developed for addressing water pollution, including biodegradation, electrochemical, ion exchange, photocatalysis and adsorption. 4,5 Among these methods, photocatalysis stands out as one of the most convenient options, primarily due to its simplicity and relatively low cost, as it does not necessitate complex posttreatment procedures.…”

The Defects, Physicochemical Properties, and Surface Charge of MIL-88A (Al) Crystal Were Regulated for Highly Efficient Removal of Anionic Dyes: Preparation, Characterization, and Adsorption Mechanism

“…Every year, a large amount of dye wastewater is discharged directly into the natural environment that endangers the health of human beings and aquatic organisms. Dyes are widely found in the textile, leather, paint, pharmaceutical, papermaking, cosmetics, and plastic industries. − The discharged dye wastewater has the characteristics of bright color, high toxicity, and difficult biodegradation. Seventy percent of the dyes used in industry are azo dyes.…”

Superior Removal of Vanadium(V) from Simulated Groundwater with a Fe-Based Metal–Organic Framework Immobilized on Cotton Fibers

“…Various treatment techniques like photocatalysis, microbiological treatment, and adsorption have been adopted to remove V­(V) from vanadium-polluted wastewater, in which adsorption is a simple, relatively inexpensive, rapid, and nonhazardous operation. , However, to guarantee the efficacy of the sorption process, the use of suitable adsorbents is crucial . Over the past few decades, there have been numerous reports on different adsorbents utilized for the selective capture of V­(V), including but not limited to resins, biosorbents, and iron-based adsorbents .…”

“…12,13 However, to guarantee the efficacy of the sorption process, the use of suitable adsorbents is crucial. 14 Over the past few decades, there have been numerous reports on different adsorbents utilized for the selective capture of V(V), including but not limited to resins, 15 biosorbents, 16 and iron-based adsorbents. 17 However, these adsorbents may suffer from a low adsorption capacity or slow kinetics.…”