Herein, we propose an excellent absorbent, poly (catechol-tetraethylenepentamine) coating onto SiO₂NH₂ microsphere, which is fabricated via a simple synthesis route. The effect of different molar ratio of catechol on the adsorption properties of silica modified composite was studied. The poly (catechol-tetraethylenepentamine)@SiO₂NH₂ ([email protected]) exhibits outstanding adsorption to Cr(VI) compared to SiO₂NH₂. The structural characterizations and adsorption performance of the product are analyzed by SEM, TEM, FTIR, XPS, etc. Many factors affecting the adsorption behavior of [email protected] were systematic explored, including pH, initial Cr(VI) concentration, contact time, adsorbent dosage, and temperature. The experimental data revealed that the adsorption behavior is suitable to be described by pseudo-second-order kinetic model and Langmuir isotherm model. The maximum uptake capacity of [email protected] composite up to 400.85 mg/g at 303 K, is much higher than the pure SiO₂NH₂, and the removal rate close to 100% when the initial concentration of the solution is below 180 mg/L. Accordingly, the removal process of the material is spontaneous and endothermic and attributed to the partial reduction of Cr(VI) to Cr(III). Based on these, it is considered that the [email protected] with good regeneration ability and is expected to be an ideal material on the removal of Cr(VI) from sewage.

本文中，我们提出了一种在SiO ₂ NH ₂微球上的优异的吸收性聚邻苯二酚-四亚乙基五胺涂层，该涂层是通过简单的合成路线制成的。研究了不同摩尔比的邻苯二酚对二氧化硅改性复合材料吸附性能的影响。与SiO ₂ NH ₂相比，聚（邻苯二酚-四亚乙基五胺）@SiO ₂ NH ₂（[受电子邮件保护]）表现出对Cr（VI）的出色吸附。通过SEM，TEM，FTIR，XPS等对产物的结构特征和吸附性能进行了分析。系统地研究了影响[email protected]吸附行为的许多因素，包括pH，初始Cr（VI）浓度，接触时间，吸附剂的用量和温度。实验数据表明，吸附行为适合用拟二阶动力学模型和Langmuir等温线模型描述。在303 K下，[受电子邮件保护的]复合材料的最大吸收量高达400.85 mg / g，比纯SiO ₂ NH ₂高得多。，当溶液的初始浓度低于180 mg / L时，去除率接近100％。因此，材料的去除过程是自发的并且是吸热的，并且归因于将Cr（VI）部分还原为Cr（III）。基于这些，认为[电子邮件保护]具有良好的再生能力，并且有望成为从污水中去除Cr（VI）的理想材料。