Cotton Fibers Lined with Nanoparticles for Dye Absorption


In a latest research revealed within the Journal of Hazardous Supplies, researchers developed an eco-friendly dye absorbent for cotton fibers by coating poly(2-(dimethylamino) ethyl methacrylate-co-4-acryloyloxybenzophenone) (P(DMAEMA-co-ABP)) and embedding silver (Ag) nanoparticles (NPs). 

Cotton Fibers Covered with Nanoparticles for "Smart" Dye Absorption

Examine: CO2-responsive useful cotton fibers adorned with Ag nanoparticles for “good” selective and enhanced dye adsorption. Picture Credit score: muratart/

The ready PCCF/Ag artificial fiber exhibited wonderful most adsorption capacities of 1538.5 mg g−1, 944 mg g−1, 415.6 mg g−1 for methyl orange (MO) anionic dye, methylene blue (MEB) cationic dye, and impartial crimson (NR) cationic dye, respectively.

Along with possessing antibacterial properties, it exhibited a 91% adsorption capability retention after 10 cycles. Furthermore, the CO2 sensitivity enhanced the anionic dye selectivity in comparison with cationic dye.

Natural Dye Extraction from Waste Water

Natural Dyes (OGs), that are the bottom of all the colourful colours used within the textile and beauty business are a serious supply of water air pollution.

These are extremely poisonous, non-biodegradable, carcinogenic, and mutagenic for people and aqueous organisms.

Some widespread strategies to take away them from wastewater embrace adsorption, catalysis, filtration, oxidation, and ion trade. Furthermore, CO2-sensitive physicochemical traits of absorbents to extend absorption affinity in direction of anionic dyes is a useful tuning change for versatile selectivity and absorption fee in numerous wastewater move circumstances.

Moreover, they neither want any chemical reagents to return them to their preliminary absorption selectivity state and absorption fee nor produce any byproducts, which makes them a promising eco-friendly, cost-effective, and reusable materials.

Moreover, Ag NPs are wonderful anti-bacterial and inert metals for the elimination of cationic and anionic natural dyes comparable to good inexperienced (BG) cationic dye, Rhodamine B (RB) cationic dye, malachite inexperienced (MG) cationic dye, Congo crimson (CR) anionic dye, MO, NR, and MEB.

Owing to their noble property, these are appropriate for wastewater with a really giant pH worth vary of 2-11. 

Concerning the Examine

On this research, researchers dip-coated a CO2-sensitive polymer absorbent, P(DMAEMA-co-ABP), on cotton fiber and embedded it with in-situgrown Ag NPs.

Firstly, P(DMAEMA-co-ABP) was synthesized by way of the free-radical polymerization of 2-(dimethylamino) ethyl methacrylate (DMAEMA) utilizing CO2 delicate 4-acryloyloxybenzophenone because the photo-crosslinking monomer and a couple of,2-azobisisobutyronitrile (AIBN) because the initiator within the 1,4-dioxane solvent.

Then it was purified and diluted in a 3 wt% tetrahydrofuran (THF) solvent for dip coating of cotton fiber.

Subsequently, the ready artificial cotton fiber, PCCF, was embedded with Ag NPs utilizing AgNO3 aqueous resolution and NaBH4 decreasing agent. Lastly, the adsorption isotherm, capability, and fee had been evaluated utilizing the Langmuir and Freundlich, pseudo-first-order kinetic, and pseudo-second-order kinetic fashions.


The profitable synthesis of CO2-sensitive polymer, P(DMAEMA-co-ABP), is evidenced from the 1724 cm−1 peak of easter bond (−O−C=O) within the FT-IR. The XRD patterns revealed a well-preserved cellulose crystal construction of cotton fiber even after the copolymer coating and Ag NPs development.

The adsorption capacities of PCCF/Ag with out CO2 stimulation for anionic dyes had been 403.5 mg g−1, 429.0 mg g−1, and 663.6 mg g−1  for MB, MO, and CR, respectively.

Equally, it was 543.8 mg g−1, 696.9 mg g−1, 325.1 mg g−1, and 378.0 mg g−1 for MG, MEB, RhB, and NR, respectively.

This indicated that the affinity of the ready PCCF/Ag in direction of cationic and anionic dyes was nearly comparable within the absence of CO2 stimulation.

Nonetheless, within the presence of CO2, the adsorption capacities for anionic dye elevated drastically to 894.6 mg g−1, 1477.8 mg g−1, and 1626.4 mg g−1 for MB, MO, and CR, respectively.

The adsorption capability of PCCF/Ag elevated for anionic dyes with a lower in pH worth, whereas it decreased for cationic dyes with a lower in pH worth of the wastewater. Additionally, it exhibited a 91% adsorption capability retention after ten cycles owing to efficient regeneration of zeta-potential.


In abstract, the researchers of this research synthesized an eco-friendly, reusable, and cost-effective artificial cotton fiber PCCF/Ag composite for the elimination of ionic natural dyes from wastewater.

The in-situ-grown Ag NPs and CO2 delicate polymer, P(DMAEMA-co-ABP), demonstrated wonderful pH-sensitive absorption capability to each cationic and anionic dyes.

Nonetheless, within the presence of CO2 stimulation, PCCF/Ag demonstrated drastically elevated affinity in direction of anionic dyes, solely. Therefore, PCCF/Ag with its tunable absorption affinity is a promising materials for the extraction of steel ions and ionic dye from numerous wastewater move circumstances.


Yang, L., Shang, J., Dou, B., Lan, J., Zhang, C., Zou, R., Xiao, H., Lin, S., (2022) CO2-responsive Useful Cotton Fibers Adorned With Ag Nanoparticles for “Sensible” Selective and Enhanced Dye Adsorption, Journal of Hazardous Supplies. Obtainable at:

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