Underwater superoleophobic mesh based on BiVO 4 nanoparticles with sunlight-driven self-cleaning property for oil/water separation

Zhang

J of Applied Polymer Sci

et al. 2017

Self Cite

In this article, four kinds of konjac glucomannan based superabsorbent polymers (KSAPs) with different aggregate sizes were obtained by sieving the KSAP powders manually. They were characterized by scanning electronic microscopy (SEM), Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and optical contact angle (OCA), and the effects of aggregate size on liquid absorption characteristics of KSAP were studied in detail. The results show that the coarse KSAP particles were aggregated by many microspheres, while the fine particles were well dispersed with 50-150 mm particle size. OCA dynamic images showed the enhanced hydrophilicity for the finer particles. The liquid absorption measurements demonstrated that water and physiological saline absorption velocity of KSAP increased for the finer particles, while their ultimate water holding capacity decreased accordingly. The liquid absorption capacity of the finest sample (75 mm) could reach its maximum value (332.5 6 5.6 g/g) in 0.5 min, while the coarsest sample (850 mm) reached the maximum value (532.5 6 1.2 g/g) in 16 min. The reason for this phenomenon was discussed, and a new model was proposed to explain it. We believe that the results of this article would be meaningful in application of KSAP as superabsorbent materials.

Section: Resultsmentioning

confidence: 77%

Effect of aggregate size on liquid absorption characteristics of konjac glucomannan superabsorbent

Zhang

J of Applied Polymer Sci

et al. 2017

Self Cite

Nanotechnology in Water and Wastewater Treatment

“…In a recent study conducted by Song et al,bismuth vanadate (BiVO4) nanoparticle with sunlight responsive self-cleaning properties has been applied for the synthesis of underwater superoleophobic mesh (Song et al 2017). Compared to conventionally used TiO2, the unique optical and electrical properties of BiVO4 allow the photocatalytic activity to be activated under visible light.…”

Section: Adsorptionmentioning

confidence: 99%

Applications of Emerging Nanomaterials for Oily Wastewater Treatment

Goh

Ong

et al. 2019

The huge volume of oily wastewater produced from the industries has resulted in alarming environmental pollution and resource usage problems. A wide range of conventional and emerging approaches have been established to effectively reduce all these pollutants to an acceptable level to discharge the treated wastewater for reuse. Lately, nanomaterials have shown great potential to address this issue based on their unique and exceptionally properties such as high surface area, superhydrophilicity/hydrophobicity and surface functionalities. This chapter discusses the application of emerging nanomaterials for oily wastewater treatment. The characteristics of these nanomaterials and their hybrid or nanocomposites for oily water treatment are discussed. Finally, a brief future outlook and concluding remarks are presented.

J of Applied Polymer Sci

“…Under hydrophilic conditions, the value of contact angle decreases with an increase in the roughness of film surface . According to the classical wetting theory, the roughness of film surface could enhance the hydrophilicity in air . The above two theories confirmed that the change in WCA was related to the surface roughness and not to the chemical properties.…”

Section: Resultsmentioning

confidence: 72%

Antimicrobial activity of nisin‐coated polylactic acid film facilitated by cold plasma treatment

Wei

et al. 2018

In this investigation, the surface functionalization of polylactic acid (PLA) film has been carried out by cold plasma treatment (CPT) to facilitate the coating of nisin on its surface. The physical and chemical properties of PLA films, such as surface morphology, water contact angle (WCA), chemical structure, and dynamic mechanical thermal properties, after CPT were systematically investigated. The obtained results demonstrated that the oxygen/carbon (O/C) ratio of PLA films decreased from 0.46 to 0.40 with an increase in the time of CPT. As the time of CPT increased, the roughness at first increased to 6.24 nm for PLA30, but then decreased to 2.26 nm for PLA60, whereas WCA at first decreased to 51.06 but then increased to 75 . Attenuated total reflectance Fourier transform infrared spectroscopy confirmed the successful coating of nisin onto PLA films with CPT. As compared with the PLA film, PN60 decreased the total viable count of Listeria monocytogenes to 2.25 log 10 [CFU/mL]. The different antimicrobial abilities against L. monocytogenes indicated that CPT could affect the adsorption capacity of PLA surface.