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

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Synthesis of Aminomethylpyridine-Decorated Polyamidoamine Dendrimer/Apple Residue for the Efficient Capture of Cd(II)
Langmuir ( IF 3.7 ) Pub Date : 2024-01-18 , DOI: 10.1021/acs.langmuir.3c03447
Mengchen Cong ₁ , Kaiyan Wu _{1,

2} , Jiaxuan Wang ₁ , Ziwei Li ₁ , Ruiyu Mao ₁ , Yuzhong Niu ₁ , Hou Chen ₁

Affiliation

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 aminomethylpyridine-functionalized 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.

中文翻译：

氨甲基吡啶修饰的聚酰胺胺树枝状聚合物/苹果渣的合成用于有效捕获 Cd(II)

Cd(II)刺激的水污染给生态系统和人类健康带来严重损害。吸附法净化Cd(II)污染是一项很有前景的技术。在这里，我们构建了氨甲基吡啶官能化聚酰胺胺（PAMAM）树枝状聚合物/苹果渣生物吸附剂（AP-G1.0-AMP和AP-G2.0-AMP）用于从水溶液中吸附Cd（II）。综合评价了生物吸附剂对Cd(II)的吸附行为。 AP-G1.0-AMP 和 AP-G2.0-AMP 在 pH 6 时对 Cd(II) 的最大吸附容量分别为 1.40 和 1.44 mmol·g ^–1 。对 Cd(II) 的吸附过程迅速且可以120分钟后达到平衡。薄膜扩散过程在吸附动力学中占主导地位，伪二阶模型适合描述该过程。提高浓度和温度可以促进 Cd(II) 的吸收。吸附等温线遵循具有化学吸附机制的朗缪尔模型。该生物吸附剂在实际水介质中对 Cd(II) 也表现出令人满意的吸附作用。吸附机理表明C-N、N=C、C-O、CONH、N-H和O-H基团参与了Cd(II)的吸附。该生物吸附剂具有良好的再生性能，可重复使用，具有实用价值。所制备的生物吸附剂在去除水溶液中的 Cd(II) 方面表现出巨大的潜力，具有显着的意义。

更新日期：2024-01-18

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