Yousaf Tayyaba, Areeb Aneeqa, Murtaza Maida, Munir Akhtar, Khan Yaqoob, Waseem Amir
Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Department of Chemistry, University of Sialkot, Sialkot 51310, Pakistan.
ACS Omega. 2022 Jun 3;7(23):19502-19512. doi: 10.1021/acsomega.2c01143. eCollection 2022 Jun 14.
The current communication describes the modifications of MXene (TiCT ) with silane grafting reaction for membrane preparation for enhanced water purification. The MXene was successfully grafted with -octadecyltrichlorosilane (MODCS), -octyltrichlorosilane (MNOCS), and triphenylchlorosilane (MTPCS) in order to make a hydrophobic MXene that could be able to bind with the organic matrix/polymers. The modified MXenes were transformed into thin membranes by forming an MXene/polyvinyl alcohol (PVA) composite over a filter paper support, that is, MCE (mixed cellulose ester filter paper). MXene membranes were also formed without the MCE support by using PVA and glutaraldehyde (PVA/GA) where GA was used as a cross-linker to stabilize PVA and make it water-resistant. The conditions of membrane formation were optimized to investigate optimum compatible conditions with the modified materials. The resulting membranes were tested for the removal of various organic pollutants that included mesitylene (or trimethylbenzene); polyaromatic hydrocarbons (chrysene, as a model); biphenyl; bisphenol A; benzene, toluene, ethylbenzene, and styrene; methylene blue; and Sudan II dyes. The MTPCS PVA/GA cross-linked membrane showed the best results for a pollutant removal efficiency up to 98%. Overall, all six types of membranes showed the removal efficiency in the range of 52-98%. It was observed that the membrane exhibits reusability up to five cycles.
本通讯描述了通过硅烷接枝反应对MXene（TiCT ）进行改性，以制备用于增强水净化的膜。MXene成功地与十八烷基三氯硅烷（MODCS）、辛基三氯硅烷（MNOCS）和三苯基氯硅烷（MTPCS）接枝，以制备能够与有机基质/聚合物结合的疏水性MXene。通过在滤纸载体（即MCE，混合纤维素酯滤纸）上形成MXene/聚乙烯醇（PVA）复合材料，将改性后的MXene转化为薄膜。还通过使用PVA和戊二醛（PVA/GA）在没有MCE载体的情况下形成MXene膜，其中GA用作交联剂以稳定PVA并使其具有防水性。优化了膜形成条件，以研究与改性材料的最佳相容条件。对所得膜进行了去除各种有机污染物的测试，这些污染物包括均三甲苯（或三甲基苯）；多环芳烃（以芘为模型）；联苯；双酚A；苯、甲苯、乙苯和苯乙烯；亚甲基蓝；以及苏丹II染料。MTPCS PVA/GA交联膜的污染物去除效率高达98%，显示出最佳效果。总体而言，所有六种类型的膜的去除效率在52%至98%之间。观察到该膜具有高达五个循环的可重复使用性。
