Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Resources, Fuzhou University, Fuzhou 350108, China.
Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Resources, Fuzhou University, Fuzhou 350108, China.
J Environ Sci (China). 2020 Aug;94:111-118. doi: 10.1016/j.jes.2020.03.016. Epub 2020 May 5.
In this work, magnesium silicate-based sulfonated polystyrene sphere composites (SPS/MgSi) were synthesized by one-step (SMD1) and two-step (SMD2) methods. For SMD1, MgSi particles were densely assembled on the surface of SPS, assisted by complexation between Fe and hydroxyl phenol. For SMD2, SPS/SiO was firstly obtained by the same method as SMD1, and then SPS/SiO was transformed directly to SPS/MgSi under hydrothermal conditions. Therefore, MgSi obtained by the two-step method had an interwoven structure. Compared to SPS, MgSi and SMD1, SMD2 presented a larger specific surface area and more negative surface charges. Therefore, SMD2 showed superior adsorption performance toward CIP with concentrations of 5, 10 and 50 mg/L, and for 50 mg/L, the equilibrium adsorption capacity could reach 329.7 mg/g. The adsorption process is fast and can be described by the pseudo-second-order kinetic model. The relationship between pH value and Zeta potential demonstrated that electrostatic interaction dominated the adsorption process. In addition, competitive adsorption showed that the effect of Na was negligible but the effect of Ca was dependent on its concentration. Humid acid (HA) could slightly promote the absorption of CIP by SMD2. After five rounds of adsorption-desorption, the equilibrium adsorption capacity of SMD2 still remained at 288.6 mg/L for 50 mg/L CIP. Notably, SMD2 presented likewise superior adsorption capacity for CIP with concentrations of 10 and 50 mg/L in Minjiang source water. All the results indicated that this synthesis method is universal and that SMD2 has potential as an adsorbent for CIP removal from aquatic environments.
在这项工作中，通过一步法（SMD1）和两步法（SMD2）合成了基于硅酸镁的磺化聚苯乙烯球复合材料（SPS/MgSi）。对于 SMD1，MgSi 颗粒通过 Fe 与羟基酚之间的络合作用，密集地组装在 SPS 的表面上。对于 SMD2，首先通过与 SMD1 相同的方法获得 SPS/SiO，然后在水热条件下直接将 SPS/SiO 转化为 SPS/MgSi。因此，两步法得到的 MgSi 具有交织结构。与 SPS、MgSi 和 SMD1 相比，SMD2 具有更大的比表面积和更多的负表面电荷。因此，SMD2 对浓度为 5、10 和 50 mg/L 的 CIP 表现出优异的吸附性能，对于 50 mg/L 的 CIP，平衡吸附容量可达 329.7 mg/g。吸附过程快速，可以用伪二级动力学模型来描述。pH 值与 Zeta 电位的关系表明，静电相互作用主导了吸附过程。此外，竞争吸附表明，Na 的影响可以忽略不计，但 Ca 的影响取决于其浓度。腐殖酸（HA）可以略微促进 SMD2 对 CIP 的吸收。经过五次吸附-解吸循环后，SMD2 对 50 mg/L CIP 的平衡吸附容量仍保持在 288.6 mg/g。值得注意的是，SMD2 对闽江原水中浓度为 10 和 50 mg/L 的 CIP 也表现出同样优异的吸附能力。所有结果表明，这种合成方法具有普遍性，SMD2 具有作为从水环境中去除 CIP 的吸附剂的潜力。
