Ion-Induced Synthesis of Alginate Fibroid Hydrogel for Heavy Metal Ions Removal

Abstract

Design and synthesis of environmentally friendly adsorbents with high adsorption capacities are urgently needed to control pollution of water resources. In this work, a calcium ion-induced approach was used to synthesize sodium alginate fibroid hydrogel (AFH). The as-prepared AFH has certain mechanical strength, and the mechanical strength is enhanced especially after the adsorption of heavy metal ions, which is very convenient for the recovery. AFH exhibited excellent adsorption performances for Cu 2+ , Cd 2+ , and Pb 2+ ions and displayed very high saturated adsorption capacities (Qe) of 315.92 mg•g −1 (Cu 2+), 232.35 mg•g −1 (Cd 2+), and 465.22 mg•g −1 (Pb 2+) with optimized pH values (3.0-4.0) and temperature (303 K). The study of isotherms and kinetics indicated that adsorption processes of heavy metal ions fitted well with the pseudo-second-order kinetics model and the Langmuir model. Pb 2+ was found to have the strongest competitiveness among the three heavy metal ions. Thus, AFH has great application prospects in the field of heavy metal ions removing from wastewater.

Sensitivity of renal cell carcinoma to cuproptosis and cuproptosis related genes FDX1 combined with DLAT as an immunological and prognostic biomarker

“…Copper is one of the most important trace elements in the human body and is a component of various essential proteins as well as being involved in extremely relevant physiological and biochemical processes [21,22]. The metabolic abnormalities of copper can cause related diseases, such as immune dysfunction, anaemia and endocrine disorders [23].…”

Recent Progress in Biopolymer-Based Hydrogel Materials for Biomedical Applications

“…The brown seaweed is treated and filtered with NaOH and attached to calcium chloride, precipitating the resultant alginate. Alginate is typically formed with the heavy metal ion absorption technique that strengths alginate hydrogels much more than a non-absorbed version and makes it a better hydrogel overall for recovery [38]. Over 200 different forms of alginates can be produced and sold, and this has to do with their slight chemical differences, specifically their M and G residue ratio of copolymer blocks.…”

A contrast of Pb(II), Cd(II), and Cu(II) toxicities to Aspergillus niger through biochemical, morphological, and genetic investigations

“…The lower mobility of Pb compared to Cd and Cu is mainly due to its lower charge density (Lei et al, 2010;Jiang et al, 2020). This indicates that Pb has a higher electronegativity and a lower pKH (negative log of hydrolysis constant) than both Cd and Cu (Barrow, 1996;Sdiri and Higashi, 2013;Kong et al, 2020). In addition, the hydrated radius of Pb (4.01 Å) is smaller than that of Cd (4.26 Å) and Cu (4.19 Å) (Nightingale Jr, 1959;Chen et 4 al., 2010).…”