title: Pseudopeptide-Based Hydrogels Trapping Methylene Blue and Eosin Y.
abstract: We present herein the preparation of four different hydrogels based on the pseudopeptide gelator Fmoc-l-Phe-d-Oxd-OH (Fmoc=fluorenylmethyloxycarbonyl), either by changing the gelator concentration or adding graphene oxide (GO) to the water solution. The hydrogels have been analysed by rheological studies that demonstrated that pure hydrogels are slightly stronger compared to GO-loaded hydrogels. Then the hydrogels efficiency to trap the cationic methylene blue (MB) and anionic eosin Y (EY) dyes has been analyzed. MB is efficiently trapped by both the pure hydrogel and the GO-loaded hydrogel through π-π interactions and electrostatic interactions. In contrast, the removal of the anionic EY is achieved in less satisfactory yields, due to the unfavourable electrostatic interactions between the dye, the gelator and GO.
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Milli
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.
authors.forename: Nicola
authors.identifier: http://orcid.org/0000-0001-9115-618X
authors.initials: N
authors.lastname: Zanna
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.
authors.forename: Andrea
authors.identifier: http://orcid.org/0000-0003-4373-0436
authors.initials: A
authors.lastname: Merlettini
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.
authors.forename: Matteo
authors.identifier: http://orcid.org/0000-0003-3494-298X
authors.initials: M
authors.lastname: Di Giosia
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.
authors.forename: Matteo
authors.identifier: http://orcid.org/0000-0002-9583-2146
authors.initials: M
authors.lastname: Calvaresi
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy.
authors.forename: Maria Letizia
authors.identifier: http://orcid.org/0000-0002-0458-7836
authors.initials: ML
authors.lastname: Focarete
authors.affiliation: Dipartimento di Chimica Ciamician, Università di Bologna, Via Selmi, 2-, 40126, Bologna, Italy. claudia.tomasini@unibo.it.
authors.forename: Claudia
authors.identifier: http://orcid.org/0000-0002-6310-2704
authors.initials: C
authors.lastname: Tomasini
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D004801:Eosine Yellowish-(YS) / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry* / Q000378:metabolism; D012212:Rheology; D013843:Thiazines / Q000737:chemistry*; D014874:Water Pollutants, Chemical
chemical_list: D004396:Coloring Agents; D020100:Hydrogels; D007477:Ions; D010455:Peptides; D013843:Thiazines; D014874:Water Pollutants, Chemical; D006108:Graphite; D008751:Methylene Blue; D004801:Eosine Yellowish-(YS)
keywords: dye adsorption; gelators; graphene oxide; hydrogels; pseudopeptides