ABSTRACT

Herein, we demonstrate a scalable method for fabricating monodisperse sulphonated polystyrene (SPS) microspheres with abundant sulphonic acid groups and excellent heavy metal removal ability. A comprehensive characterization through SEM, EDS, FT-IR, TG, XRD and XPS confirmed the formation of the SPS microspheres. Take advantage of the abundant sulphonic acid groups on the surface of microspheres, as well as the superior monodisperse properties, adsorption ability of SPS microspheres both in quantity and speed have been enhanced. The adsorption equilibrium obeyed the Langmuir isotherm model with the theoretical maximum capacities of 49.16, 15.38 and 13.89 mg·g⁻¹ for Pb²⁺, Zn²⁺ and Cu²⁺, respectively (30°C, pH = 3.5). Besides, the adsorption equilibriums of Pb²⁺ onto SPS microspheres can be achieved within only 1 min and the adsorption kinetics can be fitted by a pseudo-second-order kinetics model. More importantly, because of the micron structure of the SPS microspheres, it could overcome the excessive hydrophilia brought by rich sulphonic acid groups and thereby easily separated, which maintain a good recyclable capacity after five regeneration cycles. With the excellent adsorption ability and reusability, SPS microspheres can efficiently handle the polluted water in a convenience and rapid process, which satisfies the sustainable pollution treatment in heavy metals elimination.

 抽象的

在此，我们展示了一种可扩展的方法来制造具有丰富磺酸基团和优异重金属去除能力的单分散磺化聚苯乙烯（SPS）微球。通过 SEM、EDS、FT-IR、TG、XRD 和 XPS 的综合表征证实了 SPS 微球的形成。利用微球表面丰富的磺酸基团以及优越的单分散特性，SPS微球的吸附能力在数量和速度上都得到了增强。吸附平衡遵循Langmuir等温线模型，Pb ²⁺ 、Zn ²⁺和Cu ²⁺的理论最大容量分别为49.16、15.38和13.89 mg·g ^-1 (30℃，pH = 3.5)。此外，Pb ^~(2+)在SPS微球上的吸附平衡只需1分钟即可达到，吸附动力学可以通过准二级动力学模型进行拟合。更重要的是，由于SPS微球的微米结构，可以克服丰富的磺酸基团带来的过度亲水性，从而易于分离，在五次再生循环后仍保持良好的可回收能力。 SPS微球具有优异的吸附能力和可重复使用性，可以方便、快速地高效处理污水，满足重金属消除的可持续污染处理。