Ultrafiltration of Aqueous Solutions of Food Dye in the Presence of Surfactants

Abstract

The objective of the study is the low-pressure membrane process for treating aqueous solutions containing food dyes and surfactants. The influence of surfactants (SDS � sodium dedecil sulphate, SO � sodium octanoate) in the separation of synthetic food dyes (E104 � quinoline yellow) was analyzed. Polysulfone and polysulfone-polyaniline membranes were used. Dye and surfactant concentrations used were 10% (equivalent to 100g/m3). The pressures used in the ultrafiltration process were 0.1, 0.2 and 0.3 MPa. When dye containing solutions were passed through the membranes, an increase in their flux was observed. The presence of surfactants in the solutions lead to a decline in flux when pressures of 0.1 and 0.2 MPa were used, but an improvement could be seen as the pressure increased to 0.3 MPa, for both dead-end and cross-flow filtration. Using only dead-end alternative, higher fluxes were achieved for both membranes, but it decreases with time due to accumulation on the membrane surface. The use of cross-flow filtration did not allow accumulation on the membrane surface so that the flux was constant in time.The use of anionic surfactants improved the food dye retention. The interactions between membranes and surfactants can be an important factor supporting the efficiency of the ultrafiltration.

Iono-molecular Separation with Composite Membranes III. Nitrophenols separation on polysulphone and composite nanoparticles ultrafiltration

“…Morphological analyses of membrane and nanoparticles samples were performed by scanning electron microscopy (SEM) [48][49][50].…”

“…4c). Turbulent flow regime (on the membrane surface flow velocity 2-4 m / s) will lead to maintaining the flow of permeate at least 80% from baseline [49,50]. Experimental tests were initially carried out with solution 1g/L 1-9 g polymeric nanoparticles nitrophenols and 500 mL of feed solution keeping the working pressure to 5 atm, supply tangential flow mode of 3 m/s and working temperature of 25 o C (by cooling recirculation).…”

Preparation and Characterization of Ultrafiltration TiO2 Nanoparticles-Polysulfone Membranes

“…The M1 (Psf 12%), M2 (Psf 12% + TiO 2 anatase), and M3 (Psf 12% + TiO 2 76% anatase+ 24% rutile) membranes were prepared by phase-inversion method [40][41][42][43][44][45][46][47].…”

Ultrafiltration of Aqueous Solutions of Food Dye Using Polymeric Membranes Prepared with Surfactants

“…Dye retention coefficient (R) was determined as (2) where Ck and Cp denote the dye concentration (g/m 3 ) in retentate and permeate, respectively [25]. To obtain a wider range of flow a centrifugal pump was used (Q= 40l/min), driven by a variable speed (n = 287rpm).…”