pH-responsive magnetic graphene oxide/poly(NVI-co-AA) hydrogel as an easily recyclable adsorbent for cationic and anionic dyes

Smart Adsorbents for Aquatic Environmental Remediation

“…and polymer gums) containing pH sensitive groups and their nanocomposites are pH responsive materials that can be used for water purification. [141][142][143][144][145][146][147] pH-responsive adsorbents can be used for selective pollutant removal. For example, ammonium-functionalized hollow polymer particles (HPP-NH 3…”

“…[152] In addition to natural polymers and their composites, other synthetic polymers and polymer-based nanocomposites such as poly(AA-co-methyl methacrylate), poly(dimethylaminoethyl methacrylate), polyaniline and magnetic graphene oxide (GO)/ poly(N-vinylimidazole-co-AA) as pH-responsive adsorbent hydrogels have also been used to remove cationic and anionic dyes. [142,143,145] For example, the effective and pH-responsive crosslinked poly(dimethylaminoethyl methacrylate) (PAGD) adsorbent was prepared from phytic acid, glycidyl-methacrylate, and N,Ndimethylaminoethyl methacrylate (DMAEMA) was employed for adsorption of reactive red 24 (RR24) and fuchsin basic (FB) with maximum adsorption capacities 1871.23 and 482.54 mg g −1 at pH 3 and 9, respectively. RR24 was effectively removed by PAGD from a binary mixture of the dyes.…”

“…A pH and magnetic field responsive GO/poly(N-vinylimidazole-co-AA) hydrogel (MGO/PNA) was synthesized by random copolymerization of anionic AA and cationic N-vinylimidazole (NVI) in the presence of MGO in aqueous medium. [142] The adsorption of cationic and anionic dyes over MGO/PNA was also studied. It was found that highly acidic (pH ≈ 2) conditions favored anionic dyes adsorption due to electrostatic interactions between the sulfonic group of the anionic dyes and the protonated carboxyl group of the MGO/PNA hydrogel.…”

“…It was found that highly acidic (pH ≈ 2) conditions favored anionic dyes adsorption due to electrostatic interactions between the sulfonic group of the anionic dyes and the protonated carboxyl group of the MGO/PNA hydrogel. [142] At high pH (≈12), cationic dyes adsorption was dominant due to electrostatic interaction between the deprotonated carboxyl group of the PAA segment and cationic dyes. Additionally, hydrogen bonding, van der Waals forces, π-π stacking and hydrophobic interactions further improved dyes adsorption on the MGO/ PNA hydrogel.…”

Rapid Self‐Expansion Behavior of the PMMA‐Based Bone Cement with P(MMA‐AA)‐GO Nano‐Units

“…Graphene oxide (GO) is a 2D hydrophilic nanomaterial [ 11–13 ] with large numbers of oxygen‐containing functional groups such as hydroxyl, carbonyl, and carboxyl groups on the edge of the sheet, which allow easy interaction with other biomaterials to fabricate the nanocomposites and hydrogels. [ 14–19 ] In addition, GO has been widely used to reinforce the mechanical properties of biomaterials due to its excellent elastic modulus. [ 20–22 ]…”