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 adsorp...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 ratecontrolling 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 HNO_(3) solution efficiently.展开更多
A class of silica anchored Schiff base decorated polyamidoamine(PAMAM) dendrimers were synthesized for removing aqueous Cu(Ⅱ) and Ag(Ⅰ). The adsorption performance was investigated synthetically and the adsorption m...A class of silica anchored Schiff base decorated polyamidoamine(PAMAM) dendrimers were synthesized for removing aqueous Cu(Ⅱ) and Ag(Ⅰ). The adsorption performance was investigated synthetically and the adsorption mechanism was revealed. Results indicate the adsorption capacity depends on dendrimer generation, solution p H, contact time, temperature and initial metal ion concentration.The optimum adsorption pH is 6 for both metal ion. Adsorption kinetic suggests the adsorption can achieve equilibrium at 180 and 150 min for Cu(Ⅱ) and Ag(Ⅰ). The kinetic process is found to be in good agreement with pseudo-second-order model and film diffusion is the rate-controlling step. The adsorption isotherm indicates the adsorption is proceeded by monolayer behavior with chemical mechanism. These adsorbents exhibit competitive adsorption capacity as compared with other reported adsorbents. Theoretical calculation demonstrates the participation of hydroxyl, carbonyl, and amide groups during the adsorption of Cu(Ⅱ), while hydroxyl and amide groups are mainly responsible for capturing Ag(Ⅰ).展开更多
基金the National Natural Science Foundation of China(No.21307053)Natural Science Foundation of Shandong Province(No.ZR2018MB039)Science and Technology Research Program of Yantai(No.2017ZH060)。
文摘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 ratecontrolling 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 HNO_(3) solution efficiently.
基金Natural Science Foundation of Shandong Province(No.ZR2018MB039)is acknowledged.
文摘A class of silica anchored Schiff base decorated polyamidoamine(PAMAM) dendrimers were synthesized for removing aqueous Cu(Ⅱ) and Ag(Ⅰ). The adsorption performance was investigated synthetically and the adsorption mechanism was revealed. Results indicate the adsorption capacity depends on dendrimer generation, solution p H, contact time, temperature and initial metal ion concentration.The optimum adsorption pH is 6 for both metal ion. Adsorption kinetic suggests the adsorption can achieve equilibrium at 180 and 150 min for Cu(Ⅱ) and Ag(Ⅰ). The kinetic process is found to be in good agreement with pseudo-second-order model and film diffusion is the rate-controlling step. The adsorption isotherm indicates the adsorption is proceeded by monolayer behavior with chemical mechanism. These adsorbents exhibit competitive adsorption capacity as compared with other reported adsorbents. Theoretical calculation demonstrates the participation of hydroxyl, carbonyl, and amide groups during the adsorption of Cu(Ⅱ), while hydroxyl and amide groups are mainly responsible for capturing Ag(Ⅰ).
