Citation: Qiao Wenzhu, Zhang Peixu, Sun Lixiang, Ma Songmei, Xu Wenlong, Xu Shengguang, Niu Yuzhong. Adsorption performance and mechanism of Schiff base functionalized polyamidoamine dendrimer/silica for aqueous Mn(Ⅱ) and Co(Ⅱ)[J]. Chinese Chemical Letters, ;2020, 31(10): 2742-2746. doi: 10.1016/j.cclet.2020.04.036 shu

Adsorption performance and mechanism of Schiff base functionalized polyamidoamine dendrimer/silica for aqueous Mn(Ⅱ) and Co(Ⅱ)

School of Chemistry and Materials Science, Ludong University, Yantai 264025, China

niuyuzhong@ldu.edu.cn

Received Date: 29 February 2020
Revised Date: 2 April 2020
Accepted Date: 22 April 2020
Available Online: 30 April 2020

Figures(4)

Schiff base functionalized polyamidoamine (PAMAM) dendrimer/silica were prepared for the adsorption of aqueous Mn(Ⅱ) and Co(Ⅱ). The effects that influence the adsorption were investigated systematically and the adsorption mechanism was illustrated by theoretical calculation. The optimum adsorption pH are 4 and 6 for Mn(Ⅱ) and Co(Ⅱ). Adsorption kinetics follow pseudo-second-order model and the rate-controlling step is film diffusion process. Adsorption isotherm shows that high initial metal ion concentration facilitates the uptake of metal ions. The adsorption capacity increases first and then decreases in the temperature range of 15–35 ℃. Density functional theory (DFT) calculation demonstrates that Schiff base functionalized PAMAM dendrimer tends to coordinate Mn(Ⅱ) and Co(Ⅱ) with the oxygen atoms of hydroxyl and carbonyl groups, nitrogen of tertiary amine and imino groups. The imino and tertiary amine groups mainly dominate the adsorption. The reproducibility of the adsorbents indicates they can be regenerated by 5% thiourea and 0.5 mol/L HNO₃ solution efficiently.
- Adsorption,
- Schiff base,
- PAMAM dendrimer,
- DFT calculation
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