Synthesis of guar gum-g-(acrylic acid-co-acrylamide-co-3-acrylamido propanoic acid) IPN via in situ attachment of acrylamido propanoic acid for analyzing superadsorption mechanism of Pb(ii)/Cd(ii)/Cu(ii)/MB/MV

Abstract

GG-g-(AA-co-AM-co-APA) IPN superadsorbent, characterization of loaded microstructures and individual/synergistic adsorption mechanism of MB/SF/Pb(ii)/Cd(ii)/Cu(ii) are reported.

Multi‐C−C/C−N‐Coupled Light‐Emitting Aliphatic Terpolymers: N−H‐Functionalized Fluorophore Monomers and High‐Performance Applications

“…The complexation of adsorbed Cu II to the terpolymers substantially altered the ‐COO − asymmetric and symmetric stretching bands in the FTIR spectra of the Cu II –terpolymers. The ‐COO − asymmetric and symmetric stretching peaks appear at 1602/1542 and 1391/1408 cm −1 in Cu II – 1 and at 1564/1556/1538 and 1422/1406 cm −1 in Cu II – 2 , respectively (Figure e) . The monodentate/bidentate‐bridging/bidentate‐chelating in Cu II – 1 and ionic/bidentate‐bridging/bidentate‐chelating in Cu II – 2 were ascertained from the Δ ν values of 239/160/144 and 142/150–158/116–132 cm −1 , respectively.…”

“…Accordingly, this moisture loss is minimized in Cu II – 1 and Cu II – 2 because of the scarcity of free ‐COOH, with the majority of ‐COO − groups being involved in coordinative and ionic bonding to Cu II (Figure f). However, the significantly poorer high‐temperature thermostability of both Cu II – 1 and Cu II – 2 compared with the terpolymers is related to the rapid loss of water of crystallization from the crystalline depositions in Cu II – 1 and Cu II – 2 . Nevertheless, the lower thermal stability of the Cu II –terpolymers over the terpolymers is indicative of the reversible binding of Cu II to the terpolymers through ionic or coordinative bonding.…”

Synthesis of a novel arginine-modified starch resin and its adsorption of dye wastewater

“…Before 280 C, it corresponded to the loss of bound water via the physical adsorption of hydrogen bonds. 41 Beyond 280 C, dehydration of the glucose unit occurred, and the C-O bonds began to break, producing new products and low molecular weight volatile compounds, resulting in a high weight loss rate (61.36%). The TGA curve of StAM changed obviously, and the DTG showed two weight loss peaks at 302.7 C and 381.3 C, corresponding to the thermal decomposition of starch and the PAM graing chains, respectively, since the latter had a more thermally stable C-C backbone.…”

Structures, Properties, and Performances—Relationships of Polymeric Membranes for Pervaporative Desalination

“…Instead of the coverage of more than 70% of Earth’s surface by water, only 3% is available as fresh water, of which a very small fraction is accessible to human beings, since the major portion of such freshwater is stored as frozen glaciers and is accumulated in deep underground water reservoirs. As per the recent survey of USA, 2–7 billion people will face water scarcity by the middle of the 21 st century, as surface water is often contaminated by various hazardous contaminants, such as dyes, heavy metal ions, salts, and other organic/inorganic contaminants [1,2,3,4,5,6,7,8]. To mitigate such an alarming issue, membrane-based desalination and waste-water recycling can be thought to be one of the most effective technologies to offer safe and cleaner water [9,10].…”