Adsorption Properties of β- and Hydroxypropyl-β-Cyclodextrins Cross-Linked with Epichlorohydrin in Aqueous Solution. A Sustainable Recycling Strategy in Textile Dyeing Process

Polymers

Esther Franco¹  Marcela Ferrándiz¹  Enrique Pérez²  Miguel Ferrándiz²  Paola Fini³  MaríaI. Fortea⁴  JoséA. Gabaldón⁴  VicenteM. Gómez-López⁴  MaríaT. Mercader-Ros⁴  Santiago López-Miranda⁴  Estrella Núñez-Delicado⁴  Carmen Lucas-Abellán⁴  MaríaI. Rodríguez-López⁴  JoséA. Pellicer⁴  Pinalysa Cosma⁵  Paola Semeraro⁵ 

[1] Biotechnology Department, Textile Industry Research Association (AITEX), Plaza Emilio Sala, 1, 03801 Alcoy, Spain;Colorprint Fashion, SL, Avda. Fco. Vitoria Laporta 104, 03830 Muro de Alcoy, Alicante, Spain;Consiglio Nazionale delle Ricerche CNR-IPCF, UOS Bari, Via Orabona, 4, 70126 Bari, Italy;Dpto. de Ciencias de la Salud., Universidad Católica San Antonio de Murcia (UCAM), Avenida de los Jerónimos s/n, 30107 Guadalupe, Murcia, Spain;Universita degli Studi “Aldo Moro” di Bari, Dip. Chimica, Via Orabona, 4, 70126 Bari, Italy;

关键词: adsorption;    Direct Red;    β-CDs;    HP-β-CDs;    kinetics;    isotherm;    pulsed light;   

DOI  :  10.3390/polym11020252

来源: DOAJ

【 摘 要 】

β-cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) were used to prepare insoluble polymers using epichlorohydrin as a cross-linking agent and the azo dye Direct Red 83:1 was used as target adsorbate. The preliminary study related to adsorbent dosage, pH, agitation or dye concentration allowed us to select the best conditions to carry out the rest of experiments. The kinetics was evaluated by Elovich, pseudo first order, pseudo second order, and intra-particle diffusion models. The results indicated that the pseudo second order model presented the best fit to the experimental data, indicating that chemisorption is controlling the process. The results were also evaluated by Freundlich, Langmuir and Temkin isotherms. According to the determination coefficient (R²), Freunlich gave the best results, which indicates that the adsorption process is happening on heterogeneous surfaces. One interesting parameter obtained from Langmuir isotherm is q_max (maximum adsorption capacity). This value was six times higher when a β-CDs-EPI polymer was employed. The cross-linked polymers were fully characterized by nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA). Also, morphology and particle size distribution were both assessed. Under optimized conditions, the β-CDs-EPI polymer seems to be a useful device for removing Direct Red 83:1 (close 90%), from aqueous solutions and industrial effluents. Complementarily, non-adsorbed dye was photolyzed by a pulsed light driven advanced oxidation process. The proposed methodology is environmental and economically advantageous, considering the point of view of a sustainable recycling economy in the textile dyeing process.

【 授权许可】

Unknown