Ultrasonic-assisted removal of cationic and anionic dyes residues from wastewater using functionalized triptycene-based polymers of intrinsic microporosity (PIMs)
Ultrasonic-assisted removal of cationic and anionic dyes residues from wastewater using functionalized triptycene-based polymers of intrinsic microporosity (PIMs)
复制标题
DOI：
10.1007/s13201-023-01935-0
复制
发表时间：
2023-05
影响因子：
5.5
通讯作者：
Mohamed O. Amin;Entesar Al‐Hetlani;Ariana R. Antonangelo;Haoli Zhou;M. Carta
中科院分区：
文献类型：
--
作者：
Mohamed O. Amin;Entesar Al‐Hetlani;Ariana R. Antonangelo;Haoli Zhou;M. Carta
本文研究了一系列具有本征微孔结构的超高交联聚合物(HCP-PIMs)，即硝基三茂铁(TRIP-NO2)、氨基三茂铁(TRIP-NH2)、磺化三茂铁(TRIP-SO3H)和碳氢三茂铁(TRIP-HC)对废水中有机染料的吸附作用。该材料对阳离子染料(孔雀石绿，MG)和阴离子染料(甲基橙，MO)均有较好的去除效果。考察了初始pH、吸附浓度、吸附时间等吸附参数对吸附过程的影响。此外，对吸附动力学和吸附等温线进行了研究，结果表明吸附符合准二级动力学和朗缪尔模型。报道的最大吸附容量对所有测试的聚合物都是竞争性的。更具体地说，TRIP-SOH和TRIP-HC对MG和MO的吸附分别为~ 303和~ 270 mg g−1。通过混合两种染料对阳离子和阴离子染料的选择性进行了评估，结果表明，与阴离子MO相比，TRIP-HC完全去除了这两种物质，而TRIP-NO2、TRIP-NH_2和TRIP-SO_3对阳离子MG的选择性增强。在自来水或海水存在的情况下，使用TRIP-SO3H和TRIP-HC进行超声波辅助吸附实验，以评估水类型的影响。用电感耦合等离子体质谱对竞争离子的存在及其浓度进行了评价。我们的研究表明，自来水对这两种聚合物的吸附没有不利影响，而在海水存在下，TRIP-HC对MO的吸附性能比TRIP-SO3H的MG更稳定，这可能是因为竞争离子的浓度更大。超声波辅助吸附和磁力搅拌吸附的比较表明，前者具有更高的吸附效率。这似乎是由于在聚合物表面形成高速微喷流、声学微流和冲击波推动的更快的传质。可重复使用研究表明，高达五次吸附-解吸循环的稳定性很好。
In this work, a series of hypercrosslinked polymers of intrinsic microporosity (HCP-PIMs), namely nitro-triptycene (TRIP-NO2), amino-triptycene (TRIP-NH2), sulfonated-triptycene (TRIP-SO3H) and hydrocarbon-triptycene (TRIP-HC), are employed for the adsorption of organic dyes from wastewater. The materials show the efficient removal of cationic (malachite green, MG) and anionic (methyl orange, MO) dyes. The adsorption parameters herein investigated include the initial pH, the adsorbate concentration and the contact time, with the aim to elucidate their effect on the adsorption process. Furthermore, the adsorption kinetic and isotherms are studied, and the findings suggest the results fit well with pseudo-second-order kinetics and Langmuir model. The reported maximum adsorption capacity is competitive for all the tested polymers. More specifically, TRIP-SO3H and TRIP-HC exhibit adsorptions of ~ 303 and ~ 270 mg g−1for MG and MO, respectively. The selectivity toward cationic and anionic dyes is assessed by mixing the two dyes, and showing that TRIP-HC completely removes both species, whereas TRIP-NO2, TRIP-NH2and TRIP-SO3H show an enhanced selectivity toward the cationic MG, compared to the anionic MO. The effect of the type of water is assessed by performing ultrasonic-assisted adsorption experiments, using TRIP-SO3H and TRIP-HC in the presence of either tap or seawater. The presence of competing ions and their concentrations is evaluated by ICP-MS. Our study shows that tap water does not have a detrimental effect on the adsorption of both polymers, whereas, in the presence of seawater, the performance of TRIP-HC toward MO proved to be more stable than MG with TRIP-SO3H, which is probably due to a larger concentration of competing ions. Comparison between ultrasonic-assisted and magnetic stirring adsorption demonstrates that the former exhibits a greater efficiency. This seems due to a more rapid mass transfer, driven by the formation of high velocity micro-jets, acoustic microstreaming and shock waves, at the polymer surface. Reusability studies show a good stability up to five adsorption–desorption cycles.