Copper Ions Removal from Water using A2B3 Type Hyperbranched Poly(amidoamine) Hydrogel Particles

Abstract

Micrometer-sized hyperbranched poly(amidoamine) (hPAMAM) particles are prepared with a simple A2B3 type Aza–Michael addition reaction between aminoethylpiperazine (AEP) and methylenebisacrylamide (MBA) in an inverse suspension polymerization condition. The synthesized particles exhibited surprisingly high Cu2+ sorption capacity (0.223g/g) for a solid-type absorbent. In addition to the high sorption ability of the particle, its simple synthetic process and convenience, due to its micrometer-sized spherical shape and recyclability, make it a practical and attractive absorbent for heavy metal ion removal from aqueous solutions.

Poly (Amidehydrazide) Hydrogel Particles for Removal of Cu2+ and Cd2+ Ions from Water

“…In addition, the 990 cm −1 C = C bending of acrylamide appears in MBA, but does not appear in ADH-PAMH1.75. The C = C stretching band generally appears at 3050 cm −1 , but the overtone of amide C = O appears and overlaps with the C = C stretching band at the same range in all samples [34]. The ATR-IR spectra of other synthesized polymers showed the same characteristic absorption bands, indicating that the polymerization proceeded as expected (Figure S2).…”

“…In this study, we synthesized poly(amidehydrazide) (PAMH) hydrogel particles from dihydrazide and MBA monomers via a one-step A2 + B4 polycondensation method [28,34]. One-pot efficient and economical synthesis is a distinctive advantage of PAMH hydrogels.…”

Catalyst-free mechanochemistry as a versatile tool in synthetic chemistry: a review

“…31 The aza-Michael adducts exhibit a broad spectrum of biological activities 31 and display high importance in various fields including polymers, silicone materials and water remediation. 32 Due to the high importance of aza-Michael addition products, different catalysts including transition-metals, 33 Lewis acids 34 and ionic liquids 35 have been developed for their synthesis. Li et al described an efficient and convenient catalyst, solvent-free mechanochemical (ball milling) aza-Michael addition reaction using chalcones ( 23 ) and aromatic/aliphatic/cyclic amines ( 24 ) which showed high yields (47–99%) of Michael adducts ( 25 ) in 25 min (Scheme 11).…”

Synthesis and CO2 Capture of Porous Hydrogel Particles Consisting of Hyperbranched Poly(amidoamine)s

“…To exploit the strengths of wet-scrubbing and a dry type adsorbent, we designed a hydrogel absorbent that works in an aqueous phase. A hydrogel is introduced because hydrogels are widely used as adsorbents for various substances such as heavy metal ions, dyes, and carbon dioxide due to their high adsorption performance and ease of use in an aqueous solution [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ]. Because amines are verified carbon dioxide absorbers in wet-scrubbing processes by forming carbamate and ammonium bicarbonate with CO 2 , we adopted poly(amidoamine) (PAMAM) as our key functional material.…”