In this survey a new route has been developed the preparation of poly (amidoamine) generation 6 (PAMAM-G6) dendrimer functionalized Fe₃O₄/SiO₂ nanoparticle and was used for arsenite (As (III)) adsorption. SiO₂ was first grafted onto the surface of Fe₃O₄ to formation a core–shell structure. Then the introduction of epoxy rings were done by hydrolysis of methylsilane groups of 3-Glycidoxypropyltrimethoxysilane (GPTMS) on OH groups of SiO₂ and afterwards, PAMAM-G6 reacted with epoxy rings of GPTMS to obtain a multiamino magnetic adsorbent. The as-prepared nanocomposite was characterized by TEM, Zeta potential, FESEM, VSM, FTIR, Raman and XPS techniques. The effects of reaction time from 5 to 50 min, initial As (III) concentration in the range of 1–10 mgL⁻¹, initial adsorbent concentration in the range of 10–50 mgL⁻¹ and initial pH in the range 3–8 were studied. The resulting of kinetic and isotherm models displays high adsorption affinity (233 mg/g) for As (III) and the adsorbent can reach the adsorbent can reach the adsorption equilibrium at a neutral pH (7). The As (III) loaded nanocomposite could be separated readily from aqueous solution by magnetic and regenerated simply via NaOH. The study of the adsorption procedure showed that the pseudo-second order kinetics and Langmuir isotherm well-fitted with the experimental data of As (III) adsorption onto nanocomposite.

中文翻译：

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聚（酰胺基胺）第 6 代功能化 Fe3O4@SiO2/GPTMS 核壳磁性纳米粒子作为亚砷酸盐吸附的新型吸附剂：动力学、等温线和热力学研究。


在本次调查中，开发了一种新的路线，制备聚（酰胺基胺）第6代（PAMAM-G6）树枝状聚合物功能化Fe ₃ O ₄ /SiO ₂纳米颗粒并用于亚砷酸盐（As（III））吸附。首先将SiO ₂接枝到Fe ₃ O ₄表面形成核壳结构。然后通过3-缩水甘油氧基丙基三甲氧基硅烷(GPTMS)的甲基硅烷基团在SiO ₂的OH基上水解引入环氧环，然后PAMAM-G6与GPTMS的环氧环反应得到多氨基磁性吸附剂。通过 TEM、Zeta 电位、FESEM、VSM、FTIR、拉曼和 XPS 技术对所制备的纳米复合材料进行了表征。反应时间为 5 至 50 分钟、初始 As (III) 浓度为 1–10 mgL ^-1 、初始吸附剂浓度为 10–50 mgL ^-1以及初始 pH 为 3–8 的影响被研究了。动力学和等温线模型的结果显示出对As(III)的高吸附亲和力(233 mg/g)，并且吸附剂可以在中性pH值(7)下达到吸附平衡。负载 As (III) 的纳米复合材料可以通过磁性轻松地从水溶液中分离出来，并且只需通过 NaOH 即可再生。吸附过程的研究表明准二级动力学和Langmuir等温线与纳米复合材料吸附As(III)的实验数据非常吻合。