Hybrid electrospun porous fibers of poly(lactic acid) and nano ZIF‐8@C600 as effective degradable oil sorbents

Abstract

BACKGROUND: With the rapid industrial and urbanization development, a large amount of oily wastewater is generated from various sources. It is mutagenic and carcinogenic to human health and seriously affects the ecosystem. In this study PLA/ZIF-8@C600 nanofibers were prepared for oil adsorption. RESULTS: Hybrid nanoparticles (ZIF-8@C600) of carbon black C600 and zeolitic imidazolate framework-8 (ZIF-8) with high specific surface area and porous structure were prepared by co-deposition and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FITR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and contact angle measurement. Biodegradable composite nanofiber membranes of poly(lactic acid) (PLA) and ZIF-8@C600 were manufactured by electrospinning. The SEM and contact angle results showed that the addition of ZIF-8@C600 could adjust the diameter, porosity, pore size and hydrophobicity of the composite electrospun nanofibers. The PLA/ZIF-8@C600 porous membranes had good oil sorption properties in oil-water mixture and emulsion. The oil adsorption capacity of the sample with 1 wt% ZIF-8@C600 was improved by ∼72.59% compared with that of pure PLA (13.5 g g −1 ), which demonstrated that the PLA/ZIF-8@C600 fibers were good candidates as oil sorbents. The adsorption kinetics of the membranes on paraffin liquid was in accordance with pseudo-second-order kinetics.CONCLUSION: The addition of hybrid ZIF-8@C600 improved the hydrophobic properties and oil adsorption capacity of PLA/ZIF-8@C600 porous membranes. Because PLA is an environmentally friendly polymer, composite membranes based on it can avoid secondary pollution. Overall, these findings have good prospects for future treatment of oily wastewater. Adsorption capacity of PLA/ZIF-8@C600 fibers for oilsAll samples were cut into (2.5 cm × 2.5 cm) pieces; the thickness of the fibers was 0.15 ± 0.05 mm (measured by a digital display micrometer). Paraffin liquid (0.5 mL, dyed with Sudan III) was poured into deionized water (2.5 mL, dyed with MB) to form an artificial oil-water bath. The cut PZC-0, PZC-1, PZC-2 and PZC-3 were placed on the oil layer for 3 min each. Photographs were taken before and after oil adsorption.The adsorption capacity (q) for paraffin liquid was investigated at room temperature. Two pieces (2.5 cm × 2.5 cm) of each sample were immersed in 25 mL of paraffin liquid for 3 min. Then the J Chem Technol Biotechnol 2020; 95: 730-738

Highly Washable and Reusable Green Nanofibrous Sorbent with Superoleophilicity, Biodegradability, and Mechanical Robustness

“…47 Further increases of PHB-di-rub to 5% and 10% show a reduction in both modulus and strength; this may be ascribed to the plasticizing effect due to the increase in the rubber ratio in each nanofiber. 46 To the best of our knowledge, the reported tensile modulus and strength are the highest among such a fully biodegradable nanofibrous structure used as oil sorbent, 40,42 even outperforming a non-biodegradable fibrous mat (TS = 0.8−2.01 MPa) that was reported. 8 This mechanical robustness could potentially contribute to the reusability of a sorbent.…”

“…In another recent work, Wang and co-workers developed a series of PLA membranes incorporated with carbon black C600 and zeolitic imidazolate framework-8 (ZIF-8@C600) that improved hydrophobicity and oil sorption due to high specific surface area and porous structure. 40 Collectively, the establishment of mechanical performance relating to the durability and reusability of these PLA sorbent materials was not extensively discussed, and high oil adsorption−desorption consistency for at least 10 cycles was not achieved. 26,41−43 In this work, we successfully develop a fully biodegradable and highly toughened PLA electrospun nanofibrous membrane incorporated with the designed PHB-based rubber fillers, achieving a membrane with rough topography and low surface energy.…”

“…However, the capacity dropped by >50% after seven cycles. In another recent work, Wang and co-workers developed a series of PLA membranes incorporated with carbon black C600 and zeolitic imidazolate framework-8 (ZIF-8@C600) that improved hydrophobicity and oil sorption due to high specific surface area and porous structure . Collectively, the establishment of mechanical performance relating to the durability and reusability of these PLA sorbent materials was not extensively discussed, and high oil adsorption–desorption consistency for at least 10 cycles was not achieved. ,− …”

Polilaktik Asit-Aktif Kömür Elektrospun Mat Üretimi ve Karakterizasyonu

“…A large number of adsorbents were widely used in the ecosystem and brought with them various disadvantages. There are some disadvantageous situations that still need to be overcome, such as secondary environmental pollution from complex production processes and post-use waste [1].…”

A Role for Newly Developed Sorbents in Remediating Large‐Scale Oil Spills: Reviewing Recent Advances and Beyond

“…[24][25][26][27] Unlike dispersants, the benefits of using sorbents, which included simplicity in application and cost-friendliness, are now of interest to researchers as a remedy for oil spills. [28][29][30][31] Several studies have reported that sorbents with high-performance can easily be obtained by precise tuning of a sorbent's hydrophobicity and swelling capacity. [32,33] Modified sorbents with diverse morphologies, [34][35][36] wettability, [37][38][39][40][41] and specific surface area functions have generated to exploit high oil sorption capacity and reusability, [42][43][44][45][46][47] and these modified sorbents are now playing an important role in oil spill remediation.…”