A novel lead ion‐imprinted chelating nanofiber: Preparation, characterization, and performance evaluation

Abstract

A novel Pb(II) ion-imprinted chelating nanofibers (nIIP), synthesized by combining electrospinning with surface ion imprinting technique, was reported in this study. nIIP was characterized with Fourier transmission infrared spectrometry and scanning electron microscopy, respectively. The performance of nIIP for Pb(II) sorption was conducted through a batch adsorption experiments. Experimental data showed that adsorption capacity of nIIP was much higher than that of non-ion imprinted chelating acrylic microfibers (mNIP) derived from commercial available acrylic microfibers, and adsorption behaviors agreed well with pseudo-second-order kinetic and Langmuir isotherm model. The values of Gibbs free energy change derived from experimental data suggested that the adsorption Pb(II) on nIIP is spontaneous and favorable at high temperature. In addition, nIIP had the highest selectivity among three tested fibrous adsorbents for Pb(II) from binary metal solution, the selectivity coefficients for Pb(II) from binary metal solution of Pb(II)/Cu(II), Pb(II)/Ni(II), and Pb(II)/ Cd(II) onto nIIP were 47, 101, and 162, respectively. Besides, a forty adsorption/desorption cycles revealed that nIIP was a promising recyclable adsorbent. In conclusion, the novel nIIP is a highly effective adsorbent for enrichment and separation of Pb(II) in the presence of competitive ions in aqueous solution, and it is potential to be applied for recovering metals from heavy metal polluted industrial wastewater such as Pb(II)/Cd(II), Pb(II)/Ni(II), and Pb(II)/Cu(II) polluted wastewater.

Cation‐bioimprinted mesoporous polysaccharide/sol–gel composites prepared in media containing choline chloride‐based deep eutectic solvents

“…The bioimprinting also implicated an increase in the capacity for the imprinting cation (up to twofold), but the values remained relatively low (≤ 30 mg g −1 ). Previous references to molecular imprinting with metal cations, in different materials, from nanofibers to cryogels and chitosan microspheres, can be found in the literature …”

“…Previous references to molecular imprinting with metal cations, in different materials, from nanofibers to cryogels and chitosan microspheres, can be found in the literature. [9][10][11][12] Aiming at higher sorption capacities for metallic cations, mesoporous versions of the initial composites were attempted. 4 A network of mesopores would greatly increase the binding surface and therefore render many more binding points accessible to sorbates.…”

Functional PAN-based monoliths with hierarchical structure for heavy metal removal

“…As initial pH value increases, all samples exhibit higher adsorption capacity and the maximum capacity is obtained at pH = 5. Hereafter, any further increase of the pH value will result in a decreased adsorption capacity of the adsorbents, which can be attributed to OH -, an ion that can combine Pb (II) to form Pb(OH) + , Pb 2 (OH) 2 2+ , causing a reduction of the free Pb (II) [30]. If the pH value is further increased, the Pb (II) will convert to Pb(OH) 2 precipitate.…”

Effect of fibre diameter on fabrication of modified PAN nanofibrous membranes and catalytic performance of their Fe complexes for dye degradation

“…Most importantly, PAN nanofibrous membrane generally exhibits good resistance to mineral acids, and is unaffected by common oxidising agents and sunlight [14]. However, it can be easily modified to introduce different functional groups due to its abundant nitrile groups [15–19]. Many efforts have been devoted to investigate the electrospun PAN nanofibrous membranes as the support substrates for the diverse functional materials such as titania [20], silver [21], palladium [22,23], CuS nanoparticles [24], β-cyclodextrin [25] and iron phthalocyanine [26] in different applications.…”