Hyaluronic Acid Methacrylate Hydrogel-Modified Electrochemical Device for Adsorptive Removal of Lead(II)

Abstract

This paper presents the development of a compact, three-electrode electrochemical device functionalized by a biocompatible layer of hyaluronic acid methacrylate (HAMA) hydrogel for the adsorptive removal of detrimental lead (Pb(II)) ions in aqueous solutions. An adsorption mechanism pertaining to the observed analytical performance of the device is proposed and further experimentally corroborated. It is demonstrated that both the molecular interactions originating from the HAMA hydrogel and electrochemical accumulation originating from the electrode beneath contribute to the adsorption capability of the device. Infrared spectral analysis reveals that the molecular interaction is mainly induced by the amide functional group of the HAMA hydrogel, which is capable of forming the Pb(II)–amide complex. In addition, inductively coupled plasma mass spectrometric (ICP-MS) analysis indicates that the electrochemical accumulation is particularly valuable in facilitating the adsorption rate of the device by maintaining a high ion-concentration gradient between the solution and the hydrogel layer. ICP-MS measurements show that 94.08% of Pb(II) ions present in the test solution can be adsorbed by the device within 30 min. The HAMA hydrogel-modified electrochemical devices exhibit reproducible performance in the aspect of Pb(II) removal from tap water, with a relative standard deviation (RSD) of 1.28% (for n = 8). The experimental results suggest that the HAMA hydrogel-modified electrochemical device can potentially be used for the rapid, on-field remediation of Pb(II) contamination.

Polysaccharides as Protective Agents against Heavy Metal Toxicity

“…The as-synthesized Fe 3 O 4 @SiO 2 -HA microspheres can be used as an effective adsorbent for the removal of copper ions from an aqueous solution [ 77 ]. Wang investigated the efficacy of a hydrogel composed of hyaluronic acid methacrylate (HAMA) for the adsorptive removal of lead (Pb(II)) ions from aqueous solutions [ 78 ]. A suggested adsorption mechanism was presented, which was associated with the reported analytical performance of the device.…”

Synthesis of Carboxymethylcellulose–Acrylamide–Montmorillonite Composite Hydrogels for Wastewater Purification

“…As three-dimensional materials, hydrogels have excellent properties such as large specific surface area, high porosity, and excellent water absorption, which give them great potential for application in the field of wastewater purification [34,35]. There are many kinds of hydrogels, such as chitosan-based hydrogels [36,37], cellulose-based hydrogels [38,39], hyaluronic acid hydrogels [40,41], pectin hydrogels [42], etc. However, it is difficult for hydrogels prepared with a single material to meet application needs.…”

Recovery of Lead (II) Ions from Aqueous Solutions Using G-26 and MTS9570 Resins with Sulfonic/Phosphonic Functional Groups

“…Lead is one of the toxic metals and is discharged from different industrial activities such as mining, metals production, battery industry, and fuels combustion [5][6][7]. Lead's existence in water recourses can cause different diseases such as hepatitis and anemia [8][9][10][11]. According to the World Health Organization (WHO) guideline 2017, the maximum acceptable concentration for lead in drinking water is 0.01 mg/L [12][13][14].…”