Separation and Speciation of Iron Ions by Using Colorimetric Hydrogels

Abstract

In this study, Fe 3+ ion selective N-(Rhodamine-6G)lactam-N'-acryloyl-ethylenediamine (RH6GAC) monomer was synthesized. Then, p(Acrylamide-co-N-(Rhodamine-6G)lactam-N'-acryloyl-ethylenediamine) (p(AAm-co-RH6GAC)) and p(2-hydroxyethylmethacrylate-co-N-(Rhodamine-6G)lactam-N'-acryloyl-ethylenediamine) (p(HEMA-co-RH6GAC)) colorimetric hydrogels were synthesized by using acrylamide (AAm) and 2-hydroxyethylmethacrylate (HEMA) as primary monomers. FT-IR, SEM, polymerization yield and swelling characterizations were conducted for the resulting hydrogels. Then, these hydrogels were used in selective absorption of Fe 3+ ions from aqueous media. The hydrogels, which could absorb Fe 3+ ions selectively from a mixture of metal ions, were used as column packing material. The solutions containing Fe 2+ and Fe 3+ ions at different concentrations were separated at a rate of 97.7 ± 0.7%.

Nonequilibrium leaching behavior of metallic elements (Cu, Zn, As, Cd, and Pb) from soils collected from long-term abandoned mine sites

“…Element concentration was measured by inductively coupled plasma optical emission spectroscopy (ICP-OES, 730 Series, Agilent, USA) or inductively coupled plasma mass spectrometry (7700x, Agilent, USA). The concentration of Fe 2+ was determined using a UV-Vis spectrophotometer (k:510 nm) using 1,10-phenanthroline (Tamura et al, 1974;Ozay and Ozay, 2014), and Fe 3+ was calculated by subtracting the concentration of Fe 2+ from the total Fe concentration. The measurement error of this method, determined using 100 mg L À1 FeCl 3 solution, was <3%.…”

An efficient pH‐responsive kappa‐carrageenan/tamarind kernel powder hydrogel for the removal of brilliant green and rose bengal from aqueous solution

“…The hydrophilic functionality in the three-dimensional polymer structure of hydrogels enables it to adsorb ionic dyes such as BG and RB from effluent. Hydrogels have promising applications in various fields such as tissue engineering, drug delivery, water remediation, food industry, agriculture, and biochemical separation [27][28][29][30][31][32][33][34] due to their unique physicochemical features, particularly those known as stimuli-responsive hydrogels, which alter volume abruptly in response to slight alterations in ambient environmental stress (such as pH, magnetic field, temperature, and salt concentration, etc.). [35][36][37] A pH-responsive hydrogel comprising cationic (basic) groups (such as amine pendant groups) or anionic (acidic) groups (such as sulfonic acid or carboxylic acid pendant)group can liberate or acquire protons in response to pH change, allowing it to adsorb ionic dyes and rendering it effective for wastewater treatment.…”

“…The hydrophilic functionality in the three‐dimensional polymer structure of hydrogels enables it to adsorb ionic dyes such as BG and RB from effluent. Hydrogels have promising applications in various fields such as tissue engineering, drug delivery, water remediation, food industry, agriculture, and biochemical separation 27–34 due to their unique physicochemical features, particularly those known as stimuli‐responsive hydrogels, which alter volume abruptly in response to slight alterations in ambient environmental stress (such as pH, magnetic field, temperature, and salt concentration, etc.) 35–37 .…”

Colorimetric Detection of Mercury Species Based on Functionalized Gold Nanoparticles

“…However, most of them mainly focus on sensing inorganic mercury ions (Hg 2+ ) and those for sensing of organic mercury are rare. To the best of our knowledge, there are few reports on the applications of colorimetric sensors for the metal speciation analysis, 21,22 especially because of the lack of selective recognition ligands. So, herein, we develop a simple, rapid, and sensitive colorimetric nanosensor for the determination of Hg species by using the interparticle plasmon coupling on analyte-induced aggregation of gold nanoparticles (Au NPs) with the assistance of specific recognition ligands.…”

“…However, most of them mainly focus on sensing inorganic mercury ions (Hg 2+ ) and those for sensing of organic mercury are rare. To the best of our knowledge, there are few reports on the applications of colorimetric sensors for the metal speciation analysis, , especially because of the lack of selective recognition ligands.…”