Langmuir isotherm models applied to the sorption of acid dyes from effluent onto polyamide nanofibers

Abstract

The ability of polyamide 6 nanofibers membrane (P6NM) to remove acid dyes from effluent solution by adsorption has been studied. Equilibrium isotherms for the adsorption of three acid dyes, Acid blue 41 (AB41), Acid blue 78 (AB78), and Acid yellow 42 (AY42), on P6NM were measured experimentally. Simulated wastewater of acid dyes with the concentration of 10 mg/L for sorption process electrospun polyamide 6 with mass per unit area 12 g/m2 was used as the sorbent material. Ten sets of P6NM were dipped in separate simulated effluent. The weight of the original P6NM and the concentration of left solution were detected. Results were analyzed by the Langmuir equation using a linearized correlation coefficient. And it showed that all the dyes tested could follow the Langmuir adsorption isotherm, which gave excellent correlation for all the dyes.

Modified Electrospun Polymeric Nanofibers and Their Nanocomposites as Nanoadsorbents for Toxic Dye Removal from Contaminated Waters: A Review

“…Polyamide nanofibers are one of the common homopolymers that have been used as an effective adsorbent for the removal of dyes as it is inexpensive, insoluble in water, keeps its morphology during the adsorption process and is reusable [115]. For example, Qureshi et al fabricated nylon-6 nanofibers by an electrospinning technique and used them as an efficient and selective adsorbent for the removal of anionic dyes [113].…”

“…Another example of biopolymer nanofibers that have been used as an effective bioadsorbent for dyes removal is zein but its ability to remove dyes remains low compared to chitosan nanofibers [118]. In general, the adsorption capacity of pure spinnable polymers for removal of various dyes was low compared to other materials, as Table 5 shows the adsorption capacity of PLLA [79], Keratin [102], Nylone-6 [113], polyamide 6 [115], SPES [117], Zein [118] and PMAA-co-PMMA [119].…”