Poly(lactic acid)-poly(ethylene glycol)/Magnesium Silicate Membrane for Methylene Blue Removal: Adsorption Behavior, Mechanism, Ionic Strength and Reusability Studies

Abstract

In this work, the effect of magnesium silicate (MgSiO3) as a filler on poly(lactic acid)-poly(ethylene glycol) (PLA-PEG) membrane was investigated towards the enhancement of adsorption capacity for removal of cationic dye. The preparation and fabrication of membranes were performed through copolymerization and phase inversion techniques. Analysis of functional groups, tensile strength, morphology and surface wettability were employed in the characterization of the membranes. After the addition of MgSiO3, it was found that the PLA-PEG/MgSiO3 membrane presented a higher hydrophilic property with improved mechanical strength. Next, the adsorption of methylene blue (MB) was optimized using response surface methodology (RSM) with the parameters mass of membrane and initial concentration of MB solution. The effects of pH and ionic strength were also examined to determine the mechanism involved during adsorption processes, which later were found to be electrostatic interaction and ion-exchange mechanism. From the isotherms and kinetics studies, the PLA-PEG/MgSiO3 membrane was well fitted by the Freundlich model and pseudo second order model, respectively. This membrane also demonstrated reusable character of up to six cycles.

Self-cleaning cellulose acetate/crystalline nanocellulose/polyvinylidene fluoride/Mg0.975Ni0.025SiO3 membrane for removal of diclofenac sodium and methylene blue dye in water

“…When the photocatalyst powders are embedded into the polymeric blend, smaller pores are observed on the top surface of M1 membrane as observed in figure 2(d). That agrees with the results previously reported by Hasanuddin et al [14]. The cross-section of M1 shows channels like cavities and porous surface, see figure S1b (the dotted white line marks the edge between top porous surface and cross section surface along the thickness of the membrane).…”

“…Hasanuddin et al also reported a membrane based on polylactic acid-polyethylene glycol/MgSiO 3 (PLA-PEG/ MgSiO 3 ) to removal of MB dye by adsorption. The obtained membrane reached 86.36% of efficiency of MB dye adsorption [14].…”

“…The bands at 1023 cm −1 and 620 cm −1 are characteristic of Si-O bond. The band at 780 cm −1 corresponded to the bending Si-O [14]. The Mg-O bond was observed at 460 cm −1 [45].…”

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…A comparative evaluation of the maximum adsorption capacity of P@SiO 2 nanocomposite to adsorb MB dye according to the Langmuir isotherm and other adsorbent materials in the literature is listed in Table 7 [ 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 ]. Referring to the recent literature, equilibrium time and adsorption capacities are the main goals for scientists to investigate and develop many novel adsorbent materials.…”

Effect of Biobased SiO2 on the Morphological, Thermal, Mechanical, Rheological, and Permeability Properties of PLLA/PEG/SiO2 Biocomposites

“…For example, PLA is a brittle polymer with a slow crystallization rate, poor toughness, average permeability properties, and moderate degradation [10]. Nevertheless, several modifications can be applied to enhance PLA's properties, including copolymerization [11,12], particle addition [13,14], polymer blending [15,16], and plasticization [13,[15][16][17]. The trend and development of environmentally friendly materials led to studies and research on new production techniques for biodegradable materials using PLA as a sugarcane-based thermoplastic [18], as well as lignin addition [19] for the production of materials with good mechanical properties, excellent thermostability, and biodegradability.…”