Synthesis of Aminomethylpyridine-Decorated Polyamidoamine Dendrimer/Apple Residue for the Efficient Capture of Cd(II)

Abstract

Water contamination irritated by Cd(II) brings about severe damage to the ecosystem and to human health. The decontamination of Cd(II) by the adsorption method is a promising technology. Here, we construct aminomethylpyridinefunctionalized polyamidoamine (PAMAM) dendrimer/apple residue biosorbents (AP-G1.0-AMP and AP-G2.0-AMP) for adsorbing Cd(II) from aqueous solution. The adsorption behaviors of the biosorbents for Cd(II) were comprehensively evaluated. The maximum adsorption capacities of AP-G1.0-AMP and AP-G2.0-AMP for Cd(II) are 1.40 and 1.44 mmol•g −1 at pH 6. The adsorption process for Cd(II) is swift and can reach equilibrium after 120 min. The film diffusion process dominates the adsorption kinetics, and a pseudo-second-order model is appropriate to depict this process. The uptake of Cd(II) can be promoted by increasing concentration and temperature. The adsorption isotherm follows the Langmuir model with a chemisorption mechanism. The biosorbents also display satisfied adsorption for Cd(II) in real aqueous media. The adsorption mechanism indicates that C−N, N�C, C−O, CONH, N−H, and O−H groups participate in the adsorption for Cd(II). The biosorbents display a good regeneration property and can be reused with practical value. The as-prepared biosorbents show great potential for removing Cd(II) from water solutions with remarkable significance.

Metal Ion Responsive Luminescent Bio‐Templated Co‐Assemblies: Label‐Free Detection of Multi‐Metal Ions in Aqueous Media

“…[7] Chen and Niu's recent work introduced aminomethylpyridinefunctionalized (PAMAM) dendrimer/apple residue biosorbents (AP-G1.0-AMP and AP-G2.0-AMP) for Cd(II) adsorption revealed the participation of various functional groups (CÀ N, N=C, CÀ O, CONH, NÀ H, and OÀ H) in the adsorption mechanism. [8] Similarly, tetraphenylethene hydrazinecarbothioamide (TPE-PVA) demonstrated selective detection of Hg 2 + and Ag + ions by significantly quenching emission, alongside a notable mechanochromic photophysical phenomenon investigated through grinding, fuming, and heating experiments. [9] Further, a non-luminescent pillar [5]arene macrocycle coordinated with Cu(I) formed a (Cu(I)-P5bipy) nanocrystal, displaying distinct crystalline structures, long-lifetime triplet state emission, and pronounced solvochromic features.…”