Preparation of Sulfonated Poly(arylene ether nitrile)-Based Adsorbent as a Highly Selective and Efficient Adsorbent for Cationic Dyes

Abstract

In this work, a highly selective and efficient polymer adsorbent inspired by a water-soluble sulfonated poly(arylene ether nitrile) (SPEN) was successfully synthesized. Due to the distinct structure of functional carboxyl, sulfonic acid and rigid benzene rings, a facile aluminium (III) ions crosslinking method was employed to fabricate the SPEN-based adsorbents (SPEN-Al). Among the three adsorbents, SPEN-Al-2 exhibited superior adsorption capacities with uniform morphology. Subsequently, the SPEN-Al-2 was selected as the adsorbent for three cationic dyes (rhodamine B (Rh B), neutral red (NR), methylene blue (MB)) and three anionic dyes (orange G (OG), methyl orange (MO), acid fuchsin (AF)), respectively, demonstrating that the adsorbent possessing excellent selectivity toward cationic dyes. Moreover, the dye’s adsorption selectivity of SPEN-Al-2 was further certificated in a binary cationic-anionic dyes mixtures (MB/OG and MB/MO) system. Taking MB as a dye model, a series of factors (contact time, concentration, temperature and pH) and adsorption models were systematically investigated in dye adsorption experiments. Results indicated that the adsorption was endothermic and the maximum adsorption capacity of SPEN-Al-2 could reach up to 877.5 mg/g; pseudo-second-model and Langmuir model were fitted to the adsorption kinetics and equilibrium isotherm, respectively, manifesting that SPEN-Al adsorbent was promising in the dyes removing field.

Simultaneous Adsorption of Cationic Dyes from Binary Solutions by Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Detailed Isotherm and Kinetic Studies

“…It is due to enhancement in driving potency (induced by concentration gradient) required to subdue the resistance related to mass transfer between adsorbate and TMPAA adsorbent. Zhou and co-worker (2019) also report similar result trend for adsorption of rhodamine B (RhB), neutral red (NR), and MB cationic dyes onto sulfonated poly(arylene ether nitrile) (SPEN) based adsorbents [45]. Moreover, Figure 1 depicts that the extent of MB uptake was almost constant although the initial MG concentrations were increased from 20 mg/L.…”

Functionalized Poly(arylene ether nitrile) Porous Membrane with High Pb(II) Adsorption Performance

“…Meanwhile, it can be prepared into microspheres, fibers, membranes, etc., owing to the diversity of its preparation processes. On the basis of sulfonated poly(arylene ether nitrile) (SPEN) containing sulfonic acid and carboxylic acid groups, the synthesized SPEN membrane exhibits high sensitivity to copper ions (Cu 2+ ) and the newly fabricated SPEN absorbent is found to be efficient in the selective adsorption of cationic dyes [25,26].…”

Functionalization of polymers and nanomaterials for water treatment, food packaging, textile and biomedical applications: a review

“…Hydrosoluble polymers bearing sulfonic acid groups were not investigated frequently. A water-soluble polymer immobilized by sulfonic groups was prepared by Zhou et al (2019) and used for the removal of cationic (methylene blue, neutral red, Rhodamine-B) and anion (Orange G, acid fuchsin, methyl orange) dyes. The functionalized material is highly selective for cationic dyes.…”